45results about How to "Inhibition of dendrite growth" patented technology

The invention discloses a metal lithium negative electrode of a lithium battery. A solid-state electrolyte protection layer is on the surface of the metal lithium negative electrode. By performing electrochemical pretreatment on the lithium negative electrode, an efficient and stable solid-state electrolyte interface membrane is introduced to the surface of a lithium sheet; in the repeated deposition and separation processes of lithium ions, the solid-state electrolyte protection layer can suppress appearance of dendritic crystals and improve safety performance of the battery; in addition, the electrolyte and metal lithium also can be isolated to protect the lithium metal from being corroded by the electrolyte; by virtue of an electroplating process and screening of electrolyte types, effective protection of the metal lithium negative electrode is realized, and the cycle life of the lithium metal battery is prolonged; and compared with an unprocessed lithium negative electrode, the metal lithium negative electrode protected by the solid-state electrolyte layer can effectively suppress appearance of dendritic crystal-shaped lithium sediments, reduce secondary reactions of the electrolyte and the metal lithium, and improve cycling efficiency and cycling stability, thereby prolonging the cycle life of the lithium metal battery which takes the metal lithium as the negative electrode.

A negative electrode for a lithium metal battery, the negative electrode including: a lithium metal electrode; and a protection film disposed on at least a portion of the lithium metal electrode, wherein the protection film includes at least one first polymer selected from a polyvinyl alcohol graft copolymer, a crosslinked copolymer formed from the polyvinyl alcohol graft copolymer, a polyvinyl alcohol crosslinked copolymer, and a blend thereof.

The invention discloses a multifunctional composite material based on graphene and polymer fibers and a preparation method and application of the multifunctional composite material. A three-dimensional fiber conductive network product with the polarity-rich surface and the core-shell structure is prepared by taking the non-woven fabric as a framework, thereby inhibiting the shuttle effect in the sulfur positive electrode simultaneously, and alleviating the dendritic crystal growth problem of the lithium negative electrode so as to improve the whole performance of the lithium-sulfur battery. The lithium-sulfur battery can be used in the fields of electrocatalysis, microbial fuel cells, polymer electrode membrane electrolysis and metal-air batteries due to the characteristics of high conductivity and high specific surface area so as to provide the advantages. The composite film product is obtained by reinforcing the graphene sheet with the non-woven fabric fiber yarns, has flexibility and remarkable heat conduction, electric conduction and electromagnetic shielding properties, and can ensure safe and long-acting use of related electronic equipment.

A separator for a lead-acid battery, a pasting paper for a lead-acid battery, a plate for a lead-acid battery, and a lead-acid battery using the same are disclosed. The separator comprises a microporous sheet containing a heavy metal adsorbent comprising a rare earth compound having high heavy metal adsorbability in a neutral region and low heavy metal adsorbability in an acidic region, wherein the heavy metal adsorbent is unevenly distributed in a thickness direction of the sheet, thereby forming the heavy metal adsorbent-containing layer extending in a horizontal direction of the sheet and a layer which does not substantially contain the heavy metal adsorbent.

The invention discloses a preparation method of a lithium metal anode. The preparation method comprises the following steps: step one, preparing through holes on a lithium metal foil material, whereinthe diameter of the through holes is 100nm to 1mm, and the hole distance is 500nm to 1cm; step two, coating the front surface and the back surface of the lithium metal foil material after hole forming with a functional adhesive; step three, carrying out vacuum drying at 50 to 150 DEG C, thus obtaining the lithium metal anode, wherein the thickness of functional adhesive layers after drying is 100nm to 10mu m. The preparation method disclosed by the invention has the advantages that a stable solid-state electrolyte protective layer is formed on the surface of a lithium electrode, so that dendritic growth of the lithium metal anode can be effectively inhibited, side reaction of electrolyte and metal lithium is reduced, the coulombic efficiency of a battery is remarkably improved, and the cycle life of the battery is remarkably prolonged; the prepared lithium metal anode has better environment stability, and the lithium metal anode is still safe and stable even under a high-humidity condition; the preparation method is basically consistent with a current coating technology in lithium battery industry and is simple and feasible.

The invention provides a method for preparing a negative electrode of a lithium battery and the lithium battery. The negative electrode of a lithium battery comprises lithium metal. The preparation method comprises a step of setting a porous coating on the surface of the lithium metal, and the porous coating is used for suppressing the growth of lithium metal dendrites. The safety of the lithium metal of the lithium battery as the negative electrode is increased, the energy density of the lithium battery is greatly raised, and the commercialization of the metal lithium as a material for the negative electrode of the lithium battery is advantageously supported.

Disclosed are a composite electrolyte, including: a network web formed of a fiber containing a polymer and inorganic particles, wherein a content of the inorganic particles is 5 wt % or less based on a total weight of the composite electrolyte, a preparing method thereof, and a lithium metal battery including the same.

The invention provides a reticular polymer, a preparation method thereof, a semi-interpenetrating network polymer electrolyte and a polymer lithium battery, and relates to the technical field of lithium ion batteries. The reticular polymer provided by the invention has a structure as shown in a formula 1. The invention provides a semi-interpenetrating network polymer electrolyte that comprises thereticular polymer, polyoxyethylene and a lithium salt. The semi-interpenetrating network polymer electrolyte provided by the invention has high conductivity and stable interface contact at room temperature, and also has the advantages of excellent film-forming property and good mechanical properties. Results of the embodiment show that the room-temperature conductivity of the semi-interpenetrating network polymer electrolyte provided by the invention can reach 1.242 * 10 <-4 > S / cm, and the impedance of the contact surface with a lithium sheet is small and changes little along with the numberof days. The preparation method of the semi-interpenetrating network polymer electrolyte, provided by the invention, is simple and convenient to operate, mild in condition and low in cost. The invention also provides a polymer lithium battery which has excellent rate capability at room temperature.

The invention discloses an alkali metal composite negative electrode material and a preparation method thereof. The alkali metal composite negative electrode material comprises a carbon-based materialand alkali metal loaded on the carbon-based material, wherein the surface of the carbon-based material is coated with an affinity substance. The preparation method comprises the following steps of: (1) preparing a modification solution, and adding the carbon-based material into the modification solution to be heated and infiltrated, wherein the modification solution is one of a soluble zinc saltsolution, a soluble copper salt solution, a soluble silver salt solution, a soluble gold salt solution and a soluble compound solution containing nitrogen and phosphorus elements; (2) calcining the infiltrated carbon-based material to obtain a carbon-based material of which the surface is coated with the affinity substance; and (3) loading alkali metal on the surface of the carbon-based material of which the surface is coated with the affinity substance to obtain the alkali metal composite negative electrode material. The alkali metal composite negative electrode material disclosed by the invention is good in electrochemical performance, long in cycle life and small in overpotential; and the preparation method is simple to operate and easy to implement.

The invention discloses a sulfonic polymer eutectic solid electrolyte and a preparation method thereof. The sulfonic polymer solid electrolyte comprises at least one sulfonic high-molecular polymer and amido compound ligand, and can also comprise an inorganic inert filler, a fast ion conductor and an organic porous filler. The sulfonic high-molecular polymer may include an aliphatic sulfonic acid high-molecular polymer, an aromatic sulfonic acid high-molecular polymer and a silicon-based sulfonic acid high-molecular polymer. The amide compound ligand may include an aliphatic amide compound, an aromatic amide compound, and a silicon-containing amide compound.

The invention discloses a preparation method of a lithium metal negative electrode. Step 1: prepare transparent holes on a lithium metal foil, the hole diameter is 100nm-1mm, and the hole distance is 500nm-1cm; Step 2: apply functional glue on the The positive and negative sides of the lithium metal foil after pore making; step 3: vacuum drying at 50-150°C to obtain the lithium metal negative electrode, and the thickness of the dried functional adhesive layer is 100nm-10μm. The advantages are: by forming a stable solid electrolyte protective layer on the surface of the lithium electrode, it can effectively inhibit the dendrite growth of the lithium metal negative electrode, reduce the side reaction between the electrolyte and lithium metal, and significantly improve the Coulombic efficiency and cycle life of the battery, and The prepared lithium metal negative electrode has better environmental stability, and is still safe and stable even under high humidity conditions. Moreover, the preparation method is basically the same as the current coating process in the lithium battery industry, and is simple and feasible.

A lithium sulphur battery comprises an anode including an anode collector and an anode active material selected from the group consisting of metallic lithium, a lithium alloy and a lithium-carbon system; a cathode including a cathode collector and a cathode active material in the form of a sulphur-containing nanostructure including at least one of the group consisting of sulphur, an organosulphur compound, an organosulphur polymer, a carbon-sulfur composite, a sulphur-polymer composite and an organic sulfide; an electrolyte including a lithium salt electrolyte and a mixed organic solvent; and a separator disposed between the cathode and the anode for separating the electrolyte into a cathode electrolyte and an anode electrolyte and for allowing lithium ions to pass through. The cathode active material can prevent dissolution of intermediate polysulphides from the cathode and thereby enhance the battery life and power density.

The invention relates to a preparation method of a high-safety metal composite negative electrode. The preparation method comprises the following steps: (a) heating metal lithium to a fused state under the protection of inert gas; (b) adding an inorganic non-metal compound into the metal lithium with the fused state; after stirring and reacting, cooling, wherein the inorganic non-metal compound isselected from one or a mixture of more of sulfide, phosphide, nitride and fluoride, and the mass ratio of the metal lithium to the inorganic non-metal compound is (10 to 3) to 1. According to the preparation method, a compound protection layer can be formed on a lithium negative electrode so that electrolyte and a lithium sheet are effectively isolated and the lithium sheet is prevented from corrosion and reaction; uniform distribution of lithium ions is realized and lithium dendrites are prevented from being generated; a framework supporting effect is provided.