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205 results about "Silicon anode" patented technology

Silicon-carbon composite negative electrode material and preparation method thereof

The invention provides a silicon-carbon composite anode material, which comprises a nuclear shell structure and a support substrate, wherein particle size of the silicon-carbon composite anode material is 1-200 micrometers, and porous carbon serving as the support substrate is obtained through decomposition of biomass materials. The invention further provides a preparing method of the silicon-carbon composite anode material, which includes the following steps: 1 reaming the biomass materials in physical activation or chemical activation mode to prepare the porous carbon, or preparing small molecular organics serving as a precursor of the porous carbon in hydrolyzing mode; 2 mixing silica particles and the obtained porous carbon or the precursor of the porous carbon in solution and performing ultrasonic treatment; 3 evaporating the solution mixture to dry so as to obtain solid-state powder; and 4 drying the solid-state powder, and performing thermal treatment, crushing and sieving on the solid-state powder to obtain the silicon-carbon composite anode material. The silicon-carbon composite anode material and the preparing method thereof are simple in process, short in flow path, easy to operate and low in cost, and lithium ion batteries manufactured by the silicon-carbon composite anode material are suitable for various mobile electronic equipment or devices driven by mobile energy.
Owner:SHANGHAI JIAOTONG UNIV

Water-based adhesive used in silicon anode of lithium ion battery and preparation method of silicon anode

The invention discloses a water-based adhesive used in a silicon anode of a lithium ion battery and a preparation method of the silicon anode. The adhesive is one or more than one mixture of carbonylation Beta-cyclodextrin, poly 3 and 4-ethylene dioxy thiophene, polystyrene sulfonate and gum arabic. The invention further relates to the preparation method of the silicon anode. The preparation method comprises the following steps: firstly uniformly dispersing a silicon material, the adhesive and conductive carbon in water; and then coating the mixture on a copper collector to obtain a final product of the silicon anode of the lithium ion battery after drying. According to the adhesive, Beta-cyclodextrin is adopted, so that the solubility of the adhesive in water can be improved after the carbonylation treatment of the Beta-cyclodextrin; at the room temperature and under the condition of 0.05 C, the silicon anode starts to charge and discharge, the first time discharge specific capacity can reach up to 4440.2 mAh / g, the charging specific capacity can reach up to 3238.7 mAh / g, the charge and discharge efficiency is 72.9 percent, the charge and discharge specific capacity in one hour is 1770 mAh / g, and the cycle performance is very stable. The water-based adhesive and the silicon anode provided by the invention have the advantages of low costs, environmental friendliness, obvious effects, good conductivity, good recycling and good application prospects.
Owner:SHANGHAI JIAO TONG UNIV

Preparation method of silicon composite anode material provided with gradient change coating layer on surface

The invention discloses a preparation method of a silicon composite anode material provided with a gradient change coating layer on the surface, and aims to overcome conventional modification defects of a silicon anode material. According to the preparation method, a porous silicon material is prepared firstly, and on the basis, a chemical vapor deposition method is adopted to uniformly deposit a coating layer on the surface of the porous silicon material, wherein the coating layer adopts an elemental Si-SiC-C transition structure. A test is performed in a vapor deposition reacting furnace provide with segmented temperatures, independently controllable atmosphere and a plurality of furnace chambers. Compared with the prior art, a gradient change process is achieved through the surface coating layer, an obvious interface structure is not formed, the coating layer is tight, so that a volume effect and electric conductivity of the silicon-based anode material in a battery charge-discharge process are inhibited effectively, and the cycling stability of the material is improved greatly. The preparation method is simple in technology and suitable for large-scale industrial production, and has wide application prospect in the field of lithium ion batteries.
Owner:HEFEI GUOXUAN HIGH TECH POWER ENERGY

In-situ solid-phase synthesis method of silicon-graphene spheroidal composite material with multilevel structure and application thereof

The invention brings forward a novel low-cost in-situ solid-phase preparation method. By the method, a silicon-graphene spheroidal composite material with a multilevel structure can be synthesized by one step. The composite material can be used as a high specific energy anode material to be applied in a lithium ion battery. Low-cost organic carbohydrate and inorganic transition metal salt which are respectively used as a carbon source and a metal catalyst precursor are selected to be uniformly mixed with a silicon nano-material; by a tube furnace heating method, in-situ catalytic growth of a graphene coated network happens on the surface of silicon nano-particles; and through the bridging effect of the graphene network, spheroidal micro-scale particles with a nanometer fine structure is self-assembled. The silicon-graphene spheroidal composite anode material with the multilevel structure has an advantage of high specific capacity. In addition, two main bottleneck problems such as poor electronic conductivity of a silicon anode material and severe volume effect during the cyclic process can be overcome simultaneously, and multiplying power and cycle performance of silicon anode can be raised greatly.
Owner:SUZHOU GREEN POWER TECH CO LTD

Silicon-based composite anode material for lithium ion battery and preparation method thereof

The invention discloses a silicon-based composite anode material for a lithium ion battery and a preparation method thereof. The anode material comprises a graphite skeleton and an amorphous carbon layer which coats the graphite skeleton. The graphite skeleton is filled with a silicon material coated with a carbon-containing structure. The silicon material and the graphite skeleton are combined through a loose carbon material. The preparation method at least comprises the following steps: (1) preparing the silicon material coated with the carbon-containing structure; (2) preparing spherical particles with graphite as the main body; (3) coating the spherical particles with the amorphous carbon layer; and (4) granulating. According to the invention, the electric insulation problem of silicon anode due to its volume change can be solved, and it can be guaranteed that silicon active component can always be electrically contacted with a current collector during the charge-discharge cycle process. Meanwhile, huge stress effect caused by volume expansion/shrinkage of the active material silicon is further buffered. Then, the composite material has characteristics of high electrochemical cycle stability and regulable specific capacity.
Owner:GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG

Electrode material preparation method, electrode material and battery

The application provides an electrode material preparation method, an electrode material and a battery, used to solve the problem existing in the prior art that the silicon anode material in the battery can be easily pulverized in a full-embedded state. The electrode material comprises: a layered silicon core and graphene quantum dots; wherein the layered silicon core comprises at least two layersof silicon based material; an interlayer gap between the adjacent two layers of the at least two layers of silicon based material; wherein the silicon based material comprises at least one of siliconor oxide of silicon; and wherein the graphene quantum dots are located in the interlayer gap of the at least two layers of silicon based material.
Owner:HUAWEI TECH CO LTD

ELECTRODE BINDING MATERIAL WITH Li, Na, K SUBSTITUTED FOR POLYACRYLIC ACID FUNCTIONAL GROUP (COOH) AND A LITHIUM SECONDARY BATTERY USING THE SAME

The present invention is based on an electrode binding material including polyacrylics and a functional group substituent(Li, Na, K) as a binder of an electrode. The present invention provides a polyacrylic acid an electrode binding material including a polyacrylics mixture having a high degree of polymerization and a functional group with Li, Na or K being substituted and high efficiency Lithium secondary battery utilizing a silicon anode active material etc. using the same. Therefore, the electrode binding material of the present invention has an excellent binding force, and can reduce side reactions in reactions of a secondary battery, and maintain a stable cycle property, and also enhance electric performance.
Owner:KOREA INST OF CERAMIC ENG & TECH

Silicon-anode lithium battery electrolyte and silicon-anode lithium battery

The invention relates to silicon-anode lithium battery electrolyte. The silicon-anode lithium battery electrolyte consists of an organic solvent, a lithium salt and additives, wherein the concentration of the lithium salt is 0.001-2 mol/L; the additives consist of an additive A and fluorinated ethylene carbonate; the mass of the additive A accounts for 0.1-20% of the mass of the electrolyte; the mass of the fluorinated ethylene carbonate accounts for 0.1-10% of the mass of the electrolyte; the additive A is a sulfite compound. In a silicon-anode lithium ion battery, in non-aqueous electrolyte, the sulfite compound and the FEC (fluorinated ethylene carbonate) are used, and in EC (ethylene carbonate)-based electrolyte, electrochemical improvement effect on a silicon anode is good, and a formed SEI (solid electrolyte interface) film is thicker, so that the defect that the silicon anode has large volume expansion change in the cycle is made up, the charge and discharge performance of the silicon-anode lithium ion battery can be improved more effectively, side reactions can be reduced, thereby reducing battery expansion and improving the cycle life of the battery, and thus the room temperature performance and the high temperature performance of the battery are very good.
Owner:ZHANGJIAGANG GUOTAI HUARONG NEW CHEM MATERIALS CO LTD

Method of improving performance of lithium ion battery silicon anode material

The invention discloses a method of improving the performance of a lithium ion battery silicon anode material. The method comprises following steps: (1) preparing an anode material made of a silicon monoxide (SiO) composite material: (a) weighing a certain amount of SiO powder, pouring SiO powder into deionized water, wherein the mass ratio of SiO powder to deionized water is 1:10, and then addinga certain amount of graphite and glucose; (b) filling the obtained solution into a high energy ball milling machine, and carrying out ball milling; (c) after ball milling, placing the obtained precursor in a tubular furnace; and (d) mixing the prepared SiO / C composite material with a conductive agent (acetylene black) and an adhesive (PVDF) according to a certain ratio; and (2) carrying out a pre-lithiation treatment on an electrode. At first, a SiO material is compounded with a carbon material, then lithium is added into the composite material to carry out pre-lithiation modification, aftermodification, the modified SiO composite material is taken as a negative electrode, for the first time, the Coulomb efficiency is increased to 81% from 77%, and other performances of the SiO compositematerial are also greatly enhanced.
Owner:FUJIAN XFH NEW ENERGY MATERIALS CO LTD

Pre-lithiatedanode material with high reversible capacity and preparation method of pre-lithiatedanode material

The invention relates to a pre-lithiatedanode material with the high reversible capacity and a preparation method of the pre-lithiatedanode material. The pre-lithiatedanode material comprises a graphite-like carbon material, metallic oxide or silicon uniformly distributed on the pre-lithiatedanode material, and lithium carbonate; the first coulomb efficiency of the anode material is 5%-10% higherthan that of the corresponding pure metallic oxide or silicon anode material, and the capacity retention rate of the anode material is no less than 85% after cycling for 100-350 times. The preparationmethod includes the steps that the metallic oxide or silicon powder, lithium carbonate powder, the graphite-like carbon material and a grinding agent are stirred,mixed and subjected to ball-milling.According to the pre-lithiatedanode material with the high reversible capacity and the preparation method of the pre-lithiatedanode material, by adding the lithium carbonate, the irreversible capacityof the anode material in the initial charging and discharging process is lowered, and thus the first coulomb efficiency is improved; by adding the graphite-like carbon material, structural stabilityof the material in the reaction process and conductivity of an electrode material are improved; and according to the ball-milling method, the size of the anode material particlescan be refined in a short time, and the volume change of the anode material is buffered.
Owner:SOUTH CHINA UNIV OF TECH

High performance silicon electrodes having improved interfacial adhesion among binder, silicon and conductive particles

Methods for making a negative electrode material for use in an electrochemical cell, like a lithium ion battery, are provided. The electroactive material includes a functionalized surface having a grafted reactive group (e.g., an amino group, a carboxyl group, an anhydride group, and the like). The electrically conductive material includes a functionalized surface having a grafted reactive group (e.g., an amino group, a carboxyl group, and the like). The functionalized electroactive material and the functionalized electrically conductive material is admixed and reacted with at least one binderprecursor having a reactive group (e.g., an amino group, an anhydride group, and the like). A porous solid electrode material is thus formed. Negative electrodes are also provided, which provide significant performance benefits and reduce the issues associated with capacity fade, diminished electrochemical cell performance, cracking, and short lifespan associated with conventional silicon anode materials.
Owner:GM GLOBAL TECH OPERATIONS LLC
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