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Rigid diaphragm and solid lithium metal battery

A technology of metal batteries and solid lithium, applied in the direction of secondary batteries, battery components, separators/films/diaphragms/spacers, etc., can solve potential safety hazards, short circuits, and hinder the development and practical application of high-capacity battery systems and other issues to achieve the effect of improving cycle stability and reducing the probability of short circuit

Inactive Publication Date: 2019-04-19
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, to use metallic lithium as an anode, it is necessary to overcome the problems of safety and cycle life, mainly due to the growth of lithium dendrites, which may penetrate the separator, easily cause short circuits, cause safety hazards, and seriously hinder the development of high-capacity battery systems. and practical application

Method used

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  • Rigid diaphragm and solid lithium metal battery
  • Rigid diaphragm and solid lithium metal battery
  • Rigid diaphragm and solid lithium metal battery

Examples

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preparation example Construction

[0042] The preparation method of the coating in the embodiment of the present application is not particularly limited, and methods known to those skilled in the art can be used, such as spin coating, spray coating or deposition.

[0043] Further optionally, the lithium ion conductor is selected from at least one of lithium-intercalable oxides, elemental coatings, polymer solid electrolytes, sulfide solid electrolytes, and oxide solid electrolytes.

[0044] Among them, the intercalable lithium oxide is selected from SiO, Fe 2 o 3 , CuO, TiO 2 , MnO 2 , SnO, SnO 2 at least one of the

[0045] Wherein, the material of the elemental coating is selected from at least one of Al, In, Mg, Sn, Ge, Si, C, Pb, Sb, and Bi.

[0046]Wherein, the polymer solid electrolyte includes a polymer body and a lithium salt, and the polymer body is selected from at least one of polyether polymers, polyolefin polymers, polynitrile polymers, and polycarboxylate polymers, Lithium salts are selected...

Embodiment 1

[0107] 1. Preparation of the cathode electrode: In the glove box, the active material LiCoO 2 , sulfide solid electrolyte Li 3 P.S. 4 , conductive agent VGCF, and binder styrene-butadiene rubber (number-average molecular weight is about 500,000) are mixed in THF solvent at a weight ratio of 70:20:5:5. After fully stirring and mixing, apply it on the surface of aluminum foil. After drying, it was dried at 60°C, cold pressed, and sliced ​​to obtain LiCoO 2 The cathode active material layer, the thickness of the cathode active material layer is 50 μm.

[0108] 2. Preparation of solid electrolyte diaphragm: In a glove box, the sulfide electrolyte Li 3 P.S. 4 and binder styrene-butadiene rubber at a weight ratio of 99:1, mixed in THF solvent to prepare an electrolyte slurry, coated on the glass surface, and dried at 60°C to obtain an electrolyte membrane, which was sliced ​​to obtain a solid electrolyte with a thickness of 50 μm Diaphragm.

[0109] 3. Rigid diaphragm preparat...

Embodiment 2

[0113] The preparation method is basically the same as in Example 1, except that the thickness of the aluminum foil is replaced from 8 μm to 3 μm during the preparation of the rigid membrane.

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Abstract

The present application relates to the field of energy storage materials, especially to a rigid diaphragm and a solid lithium metal battery. The rigid diaphragm is disposed between the solid electrolyte membrane and an anode pole piece of the solid lithium metal battery, and the rigid diaphragm has a certain hardness to suppress the extension or penetration of the lithium metal anode into the solid electrolyte membrane in the assembling process of the lithium metal battery so as to reduce the short-circuit probability in the preparation process of the solid lithium metal battery. The materialsof the rigid diaphragm are selected from at least one of metal elements and an alloy containing metal elements, and can form an alloy with the deposited lithium or accommodate the deposited lithium to reduce the probability of short circuit during the charge and discharge cycle of the solid lithium metal battery and improve the cycle stability of the solid lithium metal battery.

Description

technical field [0001] The present application relates to the field of energy storage materials, in particular, to a rigid diaphragm and a solid-state lithium metal battery. Background technique [0002] With the continuous improvement of people's requirements for energy density, traditional lithium-ion batteries have been difficult to meet the increasing demand for specific energy, so metal lithium electrodes with natural advantages of high specific capacity have become a research hotspot. The specific capacity of metal lithium is 3860mAh / g, the electrochemical potential is -3.04V (vs standard hydrogen electrode), and the gravimetric energy density of lithium metal batteries such as lithium-sulfur batteries and lithium-air batteries as anodes can reach more than 400Wh / kg . [0003] However, to use metallic lithium as an anode, it is necessary to overcome the problems of safety and cycle life, mainly due to the growth of lithium dendrites, which may penetrate the separator,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/0525H01M50/44
CPCH01M10/0525H01M50/431H01M50/44H01M50/409Y02E60/10
Inventor 刘成勇郭永胜蔡挺威范铨
Owner CONTEMPORARY AMPEREX TECH CO
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