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Lithium battery cathode sheet and preparation method thereof, all-solid-state lithium battery and pre-solid-state lithium battery

A positive electrode, lithium battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as low chemical performance

Active Publication Date: 2020-11-20
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the influence of the interface layer between the positive electrode active material and the sulfide solid electrolyte of the positive electrode sheet of the lithium battery existing in the prior art and cause the electrochemical performance of the all-solid-state lithium battery or the pre-solid-state lithium battery to be low Defects, provide a lithium battery positive plate and its preparation method and all solid lithium battery and pre-solid lithium battery, because the additive contains the second lithium-containing compound and Li 2 S x , so as to reduce the influence of the interface layer between the positive electrode active material and the sulfide solid electrolyte in the positive electrode sheet of the lithium battery, thereby significantly improving the electrochemical performance of the all-solid-state lithium battery or the pre-solid-state lithium battery

Method used

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  • Lithium battery cathode sheet and preparation method thereof, all-solid-state lithium battery and pre-solid-state lithium battery
  • Lithium battery cathode sheet and preparation method thereof, all-solid-state lithium battery and pre-solid-state lithium battery
  • Lithium battery cathode sheet and preparation method thereof, all-solid-state lithium battery and pre-solid-state lithium battery

Examples

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preparation example Construction

[0058] In the present invention, the preparation method of the solid electrolyte sheet can be a variety of conventional solid electrolyte sheet preparation methods in the art, for example, it can include: uniformly mixing the sulfide solid electrolyte and the binder in the first organic solvent to form a slurry, Then the slurry is evenly coated on the polyester film, then dried at 80-85° C., cut into discs with a diameter of 13.0-15.0 mm and peeled off from the polyester film to obtain a solid electrolyte sheet. Wherein, the homogeneous mixing method may use a vacuum mixer to stir to achieve the purpose of uniform mixing. Wherein, the stirring speed may be 100-1500rmp, and the stirring time may be 1-48h.

[0059] According to the all-solid-state lithium battery of the present invention, the negative electrode sheet can be any conventional lithium ion battery negative electrode sheet in the art, for example, it can be metal lithium or lithium-indium alloy.

[0060] In the pres...

Embodiment 1

[0070] This example is used to illustrate the positive electrode sheet of the lithium battery and its preparation method and the all-solid lithium battery of the present invention.

[0071] (1) Preparation of positive electrode sheet for lithium battery

[0072] The cathode active material (LiCoO 2 )6.0mg, sulfide solid electrolyte (crystalline Li 10 GeP 2 S 12 ) 3mg, conductive agent (acetylene black) 0.7mg and binder (styrene-butadiene rubber SBR) 0.3mg are mixed uniformly in anhydrous toluene to form a stable and uniform slurry, wherein the stirring speed is 1000rmp, and the time is 12h; then Coat the obtained slurry on the current collector aluminum sheet, then dry it at 80°C, and then cut it into a disc with a diameter of 13.0mm; then use the obtained disc as the positive electrode sheet, and use metal lithium as the negative electrode sheet, and 3mol / L LiN(CF 3 SO 2 ) 2 , 2 wt% Li 2 S 6 An additive solution composed of an ether organic solvent is used as an elec...

Embodiment 2

[0078] This example is used to illustrate the positive electrode sheet of the lithium battery and its preparation method and the all-solid lithium battery of the present invention.

[0079] (1) Preparation of positive electrode sheet for lithium battery

[0080] The cathode active material (LiFePO 4 )6.0mg, sulfide solid electrolyte (crystalline Li 10 SnP 2 S 12 ) 1.5mg, conductive agent (carbon nanotube) 1.2mg and binding agent (styrene-butadiene rubber SBR) 0.12mg are mixed uniformly in anhydrous xylene to form stable uniform slurry, wherein, the stirring speed is 1500rmp, and the time is 1h; then coat the obtained slurry on the aluminum sheet of the current collector, then dry it at 85°C, and then cut it into a disc with a diameter of 14.0mm; then use the obtained disc as a positive electrode sheet, and use metal lithium as a negative electrode sheet, and will be made of 4mol / L LiCF 3 SO 3 , 5 wt% Li 2 S 2 An additive solution composed of an ether organic solvent is...

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Abstract

The invention relates to the field of the lithium battery, and specifically relates to a lithium battery positive plate and a preparation method thereof, a full solid-state lithium battery and a pre-solid state lithium battery. The invention relates to the lithium battery positive plate, the lithium battery positive plate contains a positive active material, a sulfide solid electrolyte and an additive; the positive active material comprises the first lithium-containing compound, the additive contains the second lithium-containing compound and the Li2Sx, wherein x is not less than 2 and not more than 1. The invention further relates to a method for preparing the lithium battery positive plate and a full solid-state lithium battery and the pre-solid-state lithium battery. The prepared full solid-state lithium battery or the pre-solid-state lithium battery has high coulombic efficiency and has relatively high electrochemical performance.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a lithium battery positive plate and a preparation method thereof, an all-solid lithium battery and a pre-solid lithium battery. Background technique [0002] The preparation types of all-solid-state lithium battery cathode sheets can be divided into three types, namely, powder pressing type, vacuum coating type and coating type. The powder-pressed positive electrode sheet is made by mixing the positive electrode active material, inorganic solid electrolyte powder and conductive agent in a certain proportion, and then pressing it under a certain pressure, such as a powder-pressed positive electrode publicly reported by Xiaoxiong Xu et al. sheet, the positive electrode sheet is made by pressing the inorganic solid electrolyte powder Li under a certain pressure 10 GeP 2 S 12 and cathode active material LiNi 0.80 co 0.15 al 0.05 o 2 (Solid State Ionics, Xu et al., 2015, 274, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/131H01M4/1391H01M4/36H01M4/525H01M4/62H01M10/0525H01M10/0562
CPCH01M4/131H01M4/1391H01M4/364H01M4/525H01M4/628H01M10/0525H01M10/0562Y02E60/10
Inventor 谢静郭姿珠宋威历彪
Owner BYD CO LTD
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