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A solid-state secondary battery based on a silicon-based anode and a preparation method thereof

A secondary battery and anode technology, which is applied in the field of solid-state secondary batteries and its preparation, can solve the problems of poor cycle stability and interface stability, and achieve the effect of improving cycle stability and interface stability

Pending Publication Date: 2019-01-18
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is to provide a high-energy secondary battery with good cycle stability and interface stability, so as to avoid the problems of high-energy secondary battery cycle stability and / or poor interface stability in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0077] According to one embodiment, a solid-state secondary battery based on a silicon-based anode is prepared as follows:

[0078] a) providing a silicon-based anode;

[0079] b) applying lithium to the interior of said silicon-based anode;

[0080] c) providing a high energy cathode; and

[0081] d) Assembling the pre-lithiated Si-based anode and high-energy cathode with solid electrolyte to obtain a Li-ion battery.

[0082] Those skilled in the art can understand that the step of obtaining a pre-lithiated silicon-based anode and the step of obtaining a high-energy cathode are not sequentially required, and the pre-lithiated silicon-based anode can be prepared first, or the high-energy cathode can be prepared first, or at the same time. Pre-lithiated silicon-based anode and high-energy cathode.

[0083] High-energy cathodes are available commercially or by making your own.

[0084] The method of preparing a high energy cathode is a method commonly used in the art.

[00...

Embodiment 1

[0106] Mix silicon material, graphite, carbon black and binder (NaPAA) according to the mass ratio of silicon material (Si-Ti-Al alloy): graphite: carbon black: binder (NaPAA)=40:40:10:10 100 g of the mixture was obtained, dispersed in 100 g of deionized water, and stirred well to obtain an anode slurry. The slurry was coated on a 15 micron copper foil with a coating thickness of 100 microns. After drying in a vacuum oven at 85°C for 5 hours, the silicon-based anode was obtained by cutting, and the porosity of the silicon-based anode was measured.

[0107] The slit silicon-based anode, Li metal cathode, PP / PE / PP separator are used to form a battery, and the electrolyte is LiPF 6 / A 1M solution of EC (ethylene carbonate) and DMC (dimethyl carbonate) in a volume ratio of 1:1. The cell is discharged until the silicon anode is completely lithiated. The battery is disassembled to obtain a pre-lithiated silicon-based anode.

[0108] In the glove box, 110 mg of lithium sulfide s...

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Abstract

The invention relates to a solid-state secondary battery based on a silicon-based anode, comprising: a silicon-based anode; Solid electrolyte; And high energy cathodes. Compared with batteries using liquid electrolytes and silicon-based anodes, The interface between the solid electrolyte and the silicon-based anode of the solid-state secondary battery based on the silicon-based anode according tothe present invention can be more stable, so that the solid-state secondary battery based on the silicon-based anode of the present invention has improved cycle stability even at high temperatures, and the bulk energy density of the solid-state secondary battery of the present invention is high.

Description

technical field [0001] The invention belongs to the field of battery technology. Specifically, the present invention relates to a solid-state secondary battery based on a silicon-based anode and a preparation method thereof. Background technique [0002] Lithium-ion battery is a new type of rechargeable battery, which has the advantages of high voltage, high energy density, environmental protection and no pollution, and is known as "the most promising chemical power source". [0003] As the low-carbon economy is in the ascendant, lithium-ion batteries are actively developing in the direction of vehicle power and grid energy storage. [0004] For a new generation of high-energy lithium-ion batteries, there are currently high-energy batteries based on high-energy cathodes and silicon anodes, liquid electrolytes, and solid-state batteries based on lithium anodes. [0005] For high-energy batteries based on high-energy cathodes and silicon anodes and liquid electrolytes, the g...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/058H01M4/131H01M4/134H01M10/0565
CPCH01M4/131H01M4/134H01M10/0525H01M10/0565H01M10/058Y02E60/10Y02P70/50
Inventor 陈赟华张敬君S.贝恩德王蕾周龙捷蒋蓉蓉郝小罡
Owner ROBERT BOSCH GMBH
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