33results about How to "Reduce charge and discharge polarization" patented technology

The present invention relates to a nitrogen-doped porous carbon material for a lithium-air battery positive electrode, wherein the nitrogen-doped porous carbon material has an interconnected graded pore structure, N is uniformly doped in the C skeleton, N accounts for 0.2-15% of the carbon material atomic ratio, the graded pores comprise mass transfer pores and deposition holes, the deposition holes account for 40-95% of the total pore volume, and the mass transfer pores account for 4-55% of the total pore volume. According to the present invention, with application of the carbon material as the lithium-air battery electrode material, the space utilization rate of the carbon material during the charge-discharge process can be increased at a maximum, and the energy density and the power density of the lithium-air battery can be effectively increased; and the preparation process is simple, the material source is wide, the pore structure of the graded pore carbon material can be regulated, the regulation manner is diverse, and the nitrogen doping manner is easily achieved.

The invention relates to a micro-nano-structure anode material for a Li-air battery and a preparation method of the micro-nano-structure anode material. The preparation method comprises the following steps of: preparation of hollow composite precursor fibers through electrostatic spinning by blending a metal nitride catalyst precursor with a high-carbon polymer in an organic solvent, preprocessing of the precursor fiber material, nitridation of complex fibers, and pore-forming and pore-expansion through activation. The preparation method is simple in technique and convenient to operate and is easy to realize the uniform distribution of nanoscale catalyst particles in hollow carbon fibers. A prepared anode material tube is hollow internally, a plurality of holes are formed on the wall of the tube, and metal nitride catalysts are uniformly distributed in the three-dimensional holes of the wall of the tube, so that high specific surface area provides a sufficient place for the reaction of the battery, and the hollow pore passage in the tube can ensure an oxygen diffusion channel to be smooth and has good ion transport capacity and electrical conductivity. According to the invention, the charge-discharge capacity of the Li-air battery can be improved effectively, the power multiplying performance and the power density of the Li-air battery can be improved, the internal resistance of the battery can be reduced, and the charge-discharge polarization can be lessened through the uniform distribution of the nanoscale metal nitride, therefore, the micro-nano-structure anode material has good industrialization prospect.

A composite electrocatalyst material used for Li-air batteries and a preparation method thereof. The transition metal oxide composite electrocatalyst modified by surface conductive transition metal nitride is obtained by conducting thermal nitrogen treatment, in an ammonia atmosphere or an ammonia and argon atmosphere, for transition metal oxide powder or transition metal oxide powder pretreated by nitrogen overlying, wherein the technology of the thermal nitrogen treatment is heating up the powder at a rate of 2-10 DEG C / min to reach the thermal nitrogen treatment temperature of 300-800 DEG C, preserving heat for 10min to 2h and then cooling in furnace. By controlling the content and flow rate of ammonia and the temperature and time of sintering, the thickness of the surface transition metal nitride can be controlled selectively. The method of the invention is simple in technology, convenient for operation, low in cost and strong in controllability. In addition, the obtained composite electrical catalyst has good conductivity and stability and can reduce the charging and discharging polarization of Li-air batteries effectively. The catalyst decreases the inner resistance of batteries and has good discharge capacity. The industrialization prospect of the catalyst is good.

The invention discloses a lithium supplementing material for a lithium secondary battery as well as a preparation method and application thereof. The lithium supplementing material comprises a lithium-containing compound and an inorganic nonmetal reducing agent. According to the lithium supplementing material provided by the invention, inorganic sulfide is used as a reducing agent; meanwhile, metal and nonmetal catalysts are added; the potential of the lithium supplementing agent for exerting the capacity can be effectively reduced, and no gas is generated in the process of releasing lithium ions; the lithium supplementing material has good compatibility with the current commercial positive electrode and negative electrode, can be suitable for various battery systems, does not need to adjust and redesign an electrolyte and a battery manufacturing process, and is very suitable for the current secondary lithium ion battery. The preparation method of the lithium supplementing material provided by the invention is simple in process step, compatible with the existing lithium ion energy storage device preparation process, low in cost and suitable for mass production.

The invention provides an electrolyte and a lithium ion battery, and belongs to the technical field of batteries. The electrolyte comprises an organic solvent and a lithium salt dissolved in the organic solvent, and also comprises an auxiliary agent. The auxiliary agent is selected from one or more of S elementary substance, B elementary substance, P elementary substance and a reducing compound capable of releasing specific negative ions in the electrolyte, and the specific negative ions are selected from one or more of S negative ions, B negative ions and P negative ions. The lithium ion battery comprises the electrolyte. The specific type of auxiliary agent can effectively reduce the potential when a lithium-containing compound is decomposed; and by adding the auxiliary agent into the electrolyte, the battery is ensured to have better cycling stability, and meanwhile, the applicability in a battery production process is good.

The present invention relates to an application of a graded pore structure porous carbon material in a lithium-air battery. The porous carbon material is characterized in that the porous carbon material has interconnected graded pore structure distribution, wherein the interconnected graded pore structure distribution comprises a mesopore structure for discharge product deposition and a macropore structure for oxygen and electrolyte transmission. According to the present invention, with application of the carbon material as the lithium-air battery electrode material, the space utilization rate of the carbon material during the charge-discharge process can be increased at a maximum, and the discharge specific capacity, the voltage platform and the rate discharge capability of the battery can be effectively increased so as to increase the energy density and the power density of the lithium-air battery; and the preparation process is simple, the material source is wide, the pore structure of the graded pore carbon material can be regulated, the regulation manner is diverse, and the metal / metal oxide doping can be concurrently and easily achieved.

The invention discloses a preparation method of a lithium manganous silicate cathode material with a mesoporous structure, belonging to the field of lithium ion batteries. The method comprises two processes of liquid-phase reaction and high-temperature solid-phase sintering, wherein the process of liquid-phase reaction comprises the following steps of: performing ultrasonic dispersion of the mixture of a silicon-based molecular sieve or silicon dioxide and a carbon-containing template agent into an aqueous solution of lithium salt to obtain a dispersion; dissolving manganese salt in an organic solvent to obtain a solution 1; and mixing and stirring the dispersion and the solution 1, and performing hydrothermal or oil-bath reaction, washing, filtration and vacuum drying to obtain a precipitate 2; and the process of high-temperature solid-phase sintering comprises the following steps of: performing mechanical ball milling of the precipitate 2 for 2-5 hours, and calcining in a tubular furnace in an atmosphere of argon to obtain a final product, namely the lithium manganous silicate cathode material with a mesoporous structure. Through the lithium manganous silicate cathode material with a mesoporous structure, the specific surface area of the product is larger than that of the lithium manganous silicate prepared by a conventional method.

The present invention relates to a nitrogen-doped porous carbon material for a lithium-air battery positive electrode, wherein the nitrogen-doped porous carbon material has an interconnected graded pore structure, N is uniformly doped in the C skeleton, N accounts for 0.2-15% of the carbon material atomic ratio, the graded pores comprise mass transfer pores and deposition holes, the deposition holes account for 40-95% of the total pore volume, and the mass transfer pores account for 4-55% of the total pore volume. According to the present invention, with application of the carbon material as the lithium-air battery electrode material, the space utilization rate of the carbon material during the charge-discharge process can be increased at a maximum, and the energy density and the power density of the lithium-air battery can be effectively increased; and the preparation process is simple, the material source is wide, the pore structure of the graded pore carbon material can be regulated, the regulation manner is diverse, and the nitrogen doping manner is easily achieved.

The invention relates to a core-shell structure electric catalyst material for lithium air batteries and a preparation method thereof. The electric catalyst material comprises a core layer formed by a transition metal oxide and a shell layer formed by a transition metal nitride, the core layer is a hollow or solid core, the inner diameter of the core layer is 0-50nm, the outer diameter of the core layer is 30-500nm, the thickness of the shell layer is 10-200nm, and the mass of the shell layer accounts for 10-40% of the mass of the electric catalyst material. The preparation method includes that the hollow or solid transition metal oxide is prepared by adopting a liquid phase method. On the basis, transition metal salt is nitrogenized directly to be covered on the surface of the transition metal oxide by adopting a nitriding sintering method, and the core-shell material is prepared by covering the transition metal nitride on the transition metal oxide. The core-shell material has good electrical conductivity and stability, can effectively reduce charging and discharging polarization of the lithium air batteries, reduces internal resistance of the batteries, has good discharging capacity simultaneously, is simple in preparation process method, convenient to operate and low in cost, and achieves large-scale production easily.

The invention discloses a micro / nano structured cathode material for lithium air batteries. The cathode material comprises hollow porous composite fibers, is obtained by compounding catalyst nano particles used for lithium air battery positive electrode reaction with a hollow micron-sized carbon fiber carrier, the carbon fiber tube wall comprises a plurality of nano pores which are interconnected, and the catalyst nano particles are dispersedly loaded on the carbon fiber tube wall and in the pores. The prepared cathode material can provide sufficient active substance reaction zones, simultaneously the porous structure of the tube wall increases the reaction activity of the active substance, and the hollow structure in the tube guarantees the unblocked delivery channel of oxygen. According to the invention, the cathode material disclosed herein has a structure of hollow in the tube and porous on the tube wall; the micro / nano structured cathode material formed by compounding the nano catalyst, thus the material has excellent electrical conductivity, can effectively raise the charge and discharge capacity of the lithium air batteries, reduce the polarization of charge and discharge, raise the high rate discharge capability and power density of the lithium air batteries are raised, the battery inner resistance is reduced, thus the material disclosed herein is an ideal cathode material.

The invention provides a high-voltage, high-volume, energy-density, long-life lithium-ion battery and a preparation method thereof. The battery comprises an aluminum-plastic packaging film for an external shell of the lithium-ion battery, a positive pole piece, a negative pole piece, a separator, an electrolyte, Positive and negative tabs; the conductive agent used in the positive pole piece is carbon nanotubes (CNTs), and the isolation film includes polyolefin isolation film substrate and Al 2 o 3 and polyvinylidene fluoride (PVDF) mixed coating, the surface of the polyolefin isolation film substrate is coated with Al 2 o 3 and polyvinylidene fluoride (PVDF) mixture. The high-voltage, high-volume energy-density and long-life lithium-ion battery of the present invention not only satisfies volume energy density ≥ 700Wh / L, but also has good electrochemical performance and safety performance, outstanding cycle performance, and a normal temperature life of up to 800 cycles of capacity retention. Above 80%.

The invention relates to a nano iron nitride-carbon composite catalyst for a lithium-air battery and a preparation method of the composite catalyst. The method comprises the steps of feeding iron salt, organic ligand and a surface active agent into a solvent, and carrying out heating reflux; mixing the obtained nano-sized mesoporous metal organic framework complex and a nitrogenous organic compound, and carrying out heat treatment on the mixture in the presence of ammonia gas to realize carbonization and nitridation by one step. The catalyst is formed by compounding nanoscale primary iron nitride particles and carbon material; carbon covers and partly covers the surfaces of the nanoscale primary iron nitride particles; rich mesoporous gaps exist among the stacked nanoscale primary iron nitride particles. The rich mesoporous structure of a precursor is maintained by the catalyst, the catalyst has large specific surface area and high porosity, and is beneficial to diffusing oxygen molecules into the catalyst material particles, so that the contact between oxygen and the catalyst is promoted, and the utilization rate of the catalyst is increased; the electrical conductivity is effectively improved by the carbon material on the surfaces of the particles; the nano iron nitride-carbon composite catalyst is good in stability, so that the catalytic performance is well exerted. The charge and discharge polarization of the lithium-air battery is effectively reduced; furthermore, the method is simple and convenient, the operation is easy, the cost is low, and large-scale production can be easily implemented.

A porous carbon material for positive electrodes of lithium-air or lithium-oxygen batteries. The particle size of the carbon material is 1-30um. The particle itself is a honeycomb-like porous structure composed of carbon sheets. There are two kinds of holes in the interior, one is the staggered through holes composed of carbon sheets as the hole wall, and the other is the holes evenly distributed in the hole wall; the staggered through holes are mainly the second type of pore diameter ranges from The pores of 90nm and 100-500nm account for more than 80% of the pore volume of the through-hole, the pore volume ratio of the two is 1:10-10:1, and the thickness of the carbon sheet is 2-50nm; the pores in the pore wall are mainly Pores with a pore diameter ranging from 1 to 10 nm account for more than 90% of the inner pore volume of the pore wall. The carbon material can effectively improve the discharge specific capacity, voltage platform and rate discharge capability of the battery, thereby improving the energy density and power density of the lithium-air battery.

The invention discloses an anode material of a lithium-sulfur battery and a preparation method thereof. The anode material is formed by the compounding of elementary sulfur and porous three-dimensional grading carbon. The preparation method comprises the steps of preparing a precursor compound of the porous three-dimensional grading carbon with a solvothermal method, carbonizing to obtain the porous three-dimensional grading carbon, then compounding with the sulfur to obtain the anode material of the lithium-sulfur battery. The preparation method is simple and low in cost, the prepared anode material of the lithium-sulfur battery has high sulfur containing capability, and high ion transmission capability and conductivity, and can improve the high-rate capability and the high cycle performance of the lithium-sulfur battery.

The invention relates to a carbon-based composite positive electrode material for a lithium-air battery and a preparation method of the carbon-based composite positive electrode material. The carbon-based composite positive electrode material comprises a carbon material, a protection layer and precious metal particles, wherein the protection layer wraps the surface of the carbon material and is composed of an ionic liquid, and the precious metal particles are dispersed in the ionic liquid in a nanoparticle form so as to modify the surface of the carbon material.

The application provides an electrolyte solution and a lithium ion battery, which belong to the technical field of batteries. The electrolytic solution includes an organic solvent, lithium salt dissolved in the organic solvent, and an auxiliary agent. The auxiliary agent is selected from one or more of S element, B element, P element and reducing compounds that can release specific negative ions in the electrolyte, and the specific negative ion is selected from one or more of S negative ions, B negative ions and P negative ions kind. Lithium ion batteries include this electrolyte. Specific types of additives can effectively reduce the potential of lithium-containing compounds when they decompose; the way of adding additives to the electrolyte ensures that the battery has better cycle stability and has good applicability in the battery production process.

The invention relates to an application of a porous carbon material in a lithium-air cell, which is characterized in that the carbon material has a mutually communicated graded pore structure distribution, and the pore structure is a mesopore structure suitable for depositing discharge products and a macropore structure suitable for transmission of oxygen and an electrolyte. The carbon material as the lithium-air cell material can greatly increase the space utilization rate of the carbon material during a charge and discharge process at maximum limit, specific discharge capacity, voltage platform and multiplying power discharge capability of the cell can be effectively increased, so that lithium-air cell energy density and power density can be effectively increased. The porous carbon material used for anode of lithium-air cell has the advantages that the preparation technology is simple, the material source is wide, the pore structure of the graded aperture carbon material enables regulation and control, and the regulation and control modes are various, and the doping of metal and metal oxide is easy to realize.

The present invention relates to an application of a graded pore structure porous carbon material in a lithium-air battery. The porous carbon material is characterized in that the porous carbon material has interconnected graded pore structure distribution, wherein the interconnected graded pore structure distribution comprises a mesopore structure for discharge product deposition and a macropore structure for oxygen and electrolyte transmission. According to the present invention, with application of the carbon material as the lithium-air battery electrode material, the space utilization rate of the carbon material during the charge-discharge process can be increased at a maximum, and the discharge specific capacity, the voltage platform and the rate discharge capability of the battery can be effectively increased so as to increase the energy density and the power density of the lithium-air battery; and the preparation process is simple, the material source is wide, the pore structure of the graded pore carbon material can be regulated, the regulation manner is diverse, and the metal / metal oxide doping can be concurrently and easily achieved.

The present invention relates to a nitrogen-doped porous carbon material for a lithium-air battery positive electrode. The nitrogen-doped porous carbon material is characterized in that the nitrogen-doped porous carbon material has an interconnected graded pore structure, N is uniformly doped in the C skeleton, N accounts for 0.2-15% of the carbon material atomic ratio, the graded pores comprise mass transfer pores and deposition holes, the deposition holes account for 40-95% of the total pore volume, and the mass transfer pores account for 4-55% of the total pore volume. According to the present invention, with application of the carbon material as the lithium-air battery electrode material, the space utilization rate of the carbon material during the charge-discharge process can be increased at a maximum, and the energy density and the power density of the lithium-air battery can be effectively increased; and the preparation process is simple, the material source is wide, the pore structure of the graded pore carbon material can be regulated, the regulation manner is diverse, and the nitrogen doping manner is easily achieved.