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Solid-state battery

A solid-state battery, solid electrolyte technology, applied in the direction of lithium battery, secondary battery, solid electrolyte, etc., can solve the problem of no solid-state battery work report, and achieve the effect of high utilization rate, high specific capacity and good rate performance

Active Publication Date: 2021-02-23
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there is no related work report on solid-state batteries constructed with single-ion conductor polymer-inorganic composite solid electrolytes

Method used

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Effect test

Embodiment 1

[0067] (1) Preparation of positive electrode: 80wt.% positive electrode active material LiFePO 4 , 10wt.% conductive agent acetylene black, 10wt.% polymer electrolyte polyethylene carbonate-LiFSI (mass ratio 10:1) and solvent NMP are mixed and mixed by stirring or ball milling to make a slurry. The solid content is 20%, and then the slurry is coated on one side of the aluminum foil current collector by coating, and then placed in a vacuum oven at 80°C for 24 hours, and then the positive electrode is compacted under 10MPa by cold pressing ;

[0068] (2) Preparation of organic-inorganic composite solid electrolyte separator: Li 7 La 3 Zr 2 o 12 Preparation of Inorganic Ceramic Oxide Fibers: LiNO 3 , La(NO 3 ) 3 6H 2 O, ZrO(NO 3 ) 2 Added to deionized water at a molar ratio of 7.7:3:2, in which LiNO 3 The concentration is 0.1mol / L, and 15wt.% PVP (molecular weight 1300,000) is added after dissolving. Then electrospinning to form a film: 15kV, 0.12mL / h. Li 7 La 3 Zr...

Embodiment 2

[0071] (1) Preparation of positive electrode: 75wt.% positive electrode active material LiNi 0.8 co 0.15 Al 0.05 o 2 , 10wt.% conductive agent Super-P, 15wt.% polymer electrolyte PVDF-LiTFSI (mass ratio 5:2) and solvent NMP are mixed and mixed by stirring or ball milling to make a slurry. The solid content of the slurry Then, the slurry was coated on one side of the aluminum foil current collector by coating, and then dried in a vacuum oven at 80°C for 24 hours, and then the positive electrode was compacted under 15MPa by cold pressing;

[0072] (2) Preparation of organic-inorganic composite solid electrolyte separator: 2,5-diamino-1,4-benzenedithiol dihydrochloride, bis(3-sodium sulfonate-4-carboxyphenyl)sulfone and 2, Sulfonated polybenzothiazole was prepared by direct polycondensation of 5-dicarboxyphenyl sulfone in polyphosphoric acid, and lithium polybenzothiazole sulfonate was prepared by ion exchange with LiOH. Prepare 7wt.% PVP (molecular weight 1300,000) aqueous s...

Embodiment 3

[0076] (1) Preparation of positive electrode: 50wt.% positive active material elemental sulfur, 10wt.% conductive agent Super-P and 10wt.% graphene, 30wt.% polymer electrolyte PEO-LiBF 4 (mass ratio 20:1) mixed with solvent ethanol and deionized water (volume ratio 1:1) and mixed by stirring or ball milling to make a slurry, the solid content of the slurry is 30%, and then coated with The slurry was coated on one side of the carbon-coated aluminum foil current collector, and then dried in a vacuum oven at 55°C for 24 hours, and then the positive electrode was cold-pressed at 1MPa;

[0077] (2) Preparation of organic-inorganic composite solid electrolyte diaphragm: preparation of polybenzimidazole sulfonamide lithium containing carboxyl lithium: 3,3'-diaminobiphenyl, diphenyl isophthalate, p-carboxybenzenesulfonamide Condensation at 180°C, H 2 SO 4 After sulfonation, LiOH aqueous solution replaced. Li 6 P.S. 5 Preparation of Cl ceramic particles: the Li 2 S:LiCl:P 2 S 5...

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Abstract

The invention discloses a solid-state battery and a preparation method thereof. The solid-state battery is composed of a positive electrode, an organic-inorganic composite solid electrolyte diaphragmand a negative electrode. The organic-inorganic composite solid electrolyte diaphragm and the positive electrode have good chemical and electrochemical stability; and the organic-inorganic composite solid electrolyte diaphragm and the negative material have relatively small interface impedance, and growth of lithium dendrites can be inhibited. The solid-state battery prepared by the method is small in interface impedance, controllable in interface side reaction, capable of being matched with various positive electrodes and negative electrodes, and free of lithium dendritic crystal growth phenomenon, so that the solid-state battery has high specific energy and long cycle life. And the preparation process of the solid-state battery designed by the invention is matched with the existing preparation process of the lithium ion battery, so that the requirement of large-scale production is met.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a solid-state battery and its preparation. Background technique [0002] Lithium-ion batteries have been widely used in portable electronic devices, electric vehicles, and grid energy storage due to their high energy density and high energy conversion efficiency. However, the energy density of existing lithium-ion batteries using graphite anodes can no longer meet the requirements of rapidly developing electric vehicles and portable electronic devices. Lithium has 6.941g·mol -1 Molar mass, -3.04Vvs.SHE electrode potential, theoretical specific capacity 3860mAh g -1 , 10 times that of graphite. Using metallic lithium as the negative electrode can increase the specific energy of the battery. However, lithium inevitably deposits unevenly in the organic electrolyte and forms lithium dendrites, which can pierce the separator and cause a short circuit in the battery, ...

Claims

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Application Information

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IPC IPC(8): H01M10/052H01M10/0525H01M10/056
CPCH01M10/052H01M10/0525H01M10/056H01M2300/0065Y02E60/10
Inventor 陈剑高静
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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