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Sulfide all-solid-state battery cell, preparation method thereof and all-solid-state lithium ion battery

An all-solid-state, sulfide technology, used in non-aqueous electrolyte batteries, electrolyte battery manufacturing, secondary batteries, etc., can solve problems such as high shear force difference, reduce interface impedance, increase consistency and safety. Effect

Pending Publication Date: 2021-11-16
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a sulfide all-solid-state battery cell and its preparation method, and an all-solid-state lithium-ion battery to solve the problem of poor resistance to internal high shear force in the sulfide all-solid-state battery cell in the prior art

Method used

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Examples

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preparation example Construction

[0032] In another typical embodiment of the present application, a method for preparing the above-mentioned sulfide all-solid-state battery is provided, the preparation method comprising: isostatically pressing the all-solid-state unit battery and the polymer diaphragm, A sulfide all-solid-state battery was obtained.

[0033]The polymer diaphragm in the sulfide all-solid-state battery cell obtained by the above preparation method can offset at least part of the shear force inside the all-solid-state unit cell, slow down the shear force borne by the inside of the all-solid-state unit cell, thereby reducing the The small shear force is transmitted to the interior of the all-solid-state unit cells and the adjacent all-solid-state unit cells, and reduces the interface impedance, thereby preventing the adjacent all-solid-state unit cells from being damaged by high shear force and The current collector curls up and interferes, causing internal short circuit failure. Furthermore, is...

Embodiment 1

[0049] Take a 100 μm thick PI (polyimide) film (DuPont China Group Co., Ltd.), use the same PVDF-HFP glue solution when preparing the positive electrode, coat a 0.5 μm PVDF-HFP glue layer on the PI film, and dry to obtain PI Diaphragm, spare.

[0050] Insert the above-mentioned treated PI diaphragm stacked package with a size of 4*4.5cm and a thickness of 100μm between the two above-mentioned all-solid-state unit cells, hold the pressure at 50MPa, 90°C for 10min, apply isostatic pressure once, and then Unpacking, tab welding, packaging to complete the assembly, and get a sulfide all-solid-state battery.

Embodiment 2

[0052] The difference between embodiment 2 and embodiment 1 is that

[0053] Take a 100 μm thick PET film (DuPont China Group Co., Ltd.), use the same PVDF-HFP glue solution used to prepare the positive electrode, coat a 0.5 μm PVDF-HFP glue layer on the PET film, and dry it to obtain a PET film for later use.

[0054] Insert 2 of the above-mentioned all-solid-state unit cells into the middle of the above-mentioned treated PET film with a size of 4*4.5cm and a thickness of 100μm to overlap and stack the package, press 50MPa, 90°C, hold the pressure for 10min, apply isostatic pressure once, and then Unpacking, tab welding, packaging to complete the assembly, and get a sulfide all-solid-state battery.

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PUM

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Abstract

The invention provides a sulfide all-solid-state battery cell, a preparation method thereof and an all-solid-state lithium ion battery. The sulfide all-solid-state battery cell comprises all-solid-state unit battery cells and polymer membranes which are alternately stacked, the all-solid-state unit battery cells and the polymer membranes are bonded through adhesive layers, and each all-solid-state unit battery cell comprises a first positive electrode, a first electrolyte layer, a double-sided negative electrode, a second electrolyte layer and a second positive electrode which are sequentially stacked. The polymer diaphragms can counteract at least part of shearing force in the all-solid-state unit battery cells and relieve the shearing force borne by the interiors of the all-solid-state unit battery cells, so that the transmission of the shearing force to the interior of the all-solid-state unit battery cells and the adjacent all-solid-state unit battery cells is reduced, and the interface impedance is reduced, internal short circuit failure caused by damage of high shearing force between the adjacent all-solid-state unit battery cells and curling interference of current collectors under a high-pressure condition is prevented, and the consistency and the safety of the high-capacity sulfide all-solid-state battery cell are effectively improved by adjusting the number of the all-solid-state unit battery cells.

Description

technical field [0001] The invention relates to the technical field of all-solid-state batteries, in particular to a sulfide all-solid-state battery cell, a preparation method thereof, and an all-solid-state lithium-ion 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, the sulfide electrolyte has relatively high lithium ion conductivity. Sulfide electrolytes mainly include 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 temperature c...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/058
CPCH01M10/0525H01M10/058Y02P70/50Y02E60/10
Inventor 王磊黄海强李瑞杰陈少杰李生
Owner SVOLT ENERGY TECHNOLOGY CO LTD