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A kind of all-solid-state electric core and its preparation method and solid-state battery

An all-solid-state, cell technology, applied in non-aqueous electrolyte batteries, lithium batteries, secondary batteries, etc., can solve the problems of difficult to achieve the leap of all-solid-state batteries, the inability to realize the application of ultra-thin sulfide electrolyte membrane, etc. The effect of core cost, reduced length, strong compression and shear resistance

Active Publication Date: 2021-08-27
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, none of the above-mentioned methods in the prior art can realize the application of ultra-thin sulfide electrolyte membrane, and it is difficult to achieve the leap of all-solid-state batteries from mold batteries to pouch cells.

Method used

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  • A kind of all-solid-state electric core and its preparation method and solid-state battery
  • A kind of all-solid-state electric core and its preparation method and solid-state battery
  • A kind of all-solid-state electric core and its preparation method and solid-state battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] In this embodiment, an all-solid-state battery cell is prepared according to the following method:

[0092] (1) An electrolyte membrane (Li 10 GeP 2 S 12 (LGPS) electrolyte membrane) is pasted on the negative electrode sheet (single-sided negative electrode sheet, the negative electrode current collector is copper foil, the negative electrode active material layer is composed of negative electrode active material, sulfide electrolyte, conductive agent and binder, and the negative electrode active material is silicon. , the sulfide electrolyte is LGPS, the conductive agent is carbon nanotube CNT, the binder is SBR, and the mass ratio of negative electrode active material, conductive agent and binder is 10:80:5:5), at 100°C Under the pressure of 500MPa, carry out warm isostatic pressing treatment, the number of times of pressing is 5 times, and the holding time of each time is 100min, after which the matrix is ​​removed to obtain the first semi-finished battery cell;

...

Embodiment 2

[0099] In this embodiment, an all-solid-state battery cell is prepared according to the following method:

[0100] (1) Lay the electrolyte membrane (thickness and material identical to the electrolyte membrane of Example 1) on the substrate (polytetrafluoroethylene substrate) to the negative electrode sheet (double-sided negative electrode sheet, the negative electrode current collector is copper foil, each The type and ratio of the components of the negative active material layer on one side are the same as the negative active material of Example 1) on both sides, carry out isostatic pressing according to the same conditions as in Example 1 step (1), and then remove the Substrate to obtain the first semi-finished battery cell;

[0101] (2) On the electrolyte membranes on both sides of the first semi-finished electric core described in step (1), affix the positive electrode sheet (the positive electrode current collector is an aluminum foil, and the component type and ratio of...

Embodiment 3

[0106] In this embodiment, an all-solid-state battery cell is prepared according to the following method:

[0107] (1) An electrolyte membrane (Li 6 P.S. 5 Cl (LPSCl) electrolyte membrane) is pasted on the negative electrode sheet (single-sided negative electrode sheet, the negative electrode current collector is copper foil, the negative electrode active material layer is composed of negative electrode active material, sulfide electrolyte, conductive agent and binder, and the negative electrode active material is Graphite, the sulfide electrolyte is LPSCl, the conductive agent is conductive carbon black SP, the binder is SBR, and the mass ratio of negative electrode active material, conductive agent and binder is 55:40:5:5), on one side at 25 cold isostatic pressing at a pressure of 500 MPa at ℃, the number of times of pressing is 5 times, and the holding time of each time is 300 minutes, and then the matrix is ​​removed to obtain the first semi-finished battery cell;

[01...

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Abstract

The invention provides an all-solid battery cell, a preparation method thereof, and a solid-state battery. The preparation method includes: 1) laminating the negative electrode sheet and the electrolyte membrane, and performing isostatic pressing treatment to obtain the first semi-finished electric core; 2) laminating the positive electrode sheet on the electrolyte membrane of the first semi-finished electric core, and performing isostatic pressing pressure treatment to obtain the all-solid-state battery. The preparation method provided by the present invention carries out isostatic pressing step by step, so that it has very low requirements on the mechanical strength of the sulfide electrolyte membrane, so a thinner electrolyte membrane can be used, which greatly reduces the amount of electrolyte and lithium ion in the working process of the battery. The length of the transfer path reduces the impedance, and the requirements for the bonding strength of the adhesive and the limited range of the type are reduced, which is conducive to reducing the cost of the battery cell and realizing the leap from the mold battery to the pouch battery of the all-solid-state battery.

Description

technical field [0001] The invention belongs to the technical field of batteries, and relates to an electric core, a preparation method thereof, and a battery, in particular to an all-solid electric core, a preparation method thereof, and a solid-state battery. Background technique [0002] The solid-state battery replaces the flammable organic liquid electrolyte with a non-flammable solid electrolyte, which greatly improves the safety of the battery system and achieves a simultaneous increase in energy density. Among all kinds of new battery systems, solid-state batteries are the next-generation technology closest to industrialization, which has become the consensus of the industry and the scientific community. Among them, sulfide electrolytes have relatively high lithium ion conductivity, mainly including thio-LISICON, Li 10 GeP 2 S 12 , Li 6 P.S. 5 Cl, Li 10 SnP 2 S 12 , Li 2 S-P 2 S 5 , Li 2 S-SiS 2 , Li 2 S-B 2 S 3 etc., the ionic conductivity at room te...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0585H01M10/052
CPCH01M10/0585H01M10/052H01M10/0525Y02E60/10Y02P70/50
Inventor 王磊李瑞杰黄海强陈少杰周龙捷
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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