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Electrode for all-solid-state battery, comprising solid electrolyte, and all-solid-state battery

A technology of all-solid-state batteries and solid electrolytes, applied in non-aqueous electrolyte battery electrodes, solid electrolytes, battery electrodes, etc., can solve the problems of increased electrode interface resistance, shortened battery life, etc., and achieve the effect of preventing resistance increase

Active Publication Date: 2019-03-19
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the resistance of the electrode interface increases, causing a problem of shortening the service life of the battery

Method used

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  • Electrode for all-solid-state battery, comprising solid electrolyte, and all-solid-state battery
  • Electrode for all-solid-state battery, comprising solid electrolyte, and all-solid-state battery
  • Electrode for all-solid-state battery, comprising solid electrolyte, and all-solid-state battery

Examples

Experimental program
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Effect test

Embodiment 1

[0062] (1) Manufacture of negative electrode

[0063] will have an average particle size of 20 μm (D 50 ), carbon black as conductive material, polymer solid electrolyte (PEO+LiFSI (lithium bis(fluorosulfonyl)imide), 20:1 (molar ratio)) and vapor-grown carbon fiber (VGCF, 20 μm long ) were mixed in a weight ratio of 70:5:20:5 to obtain 5 g of the mixture. Acetonitrile (AN) was added to the mixture to prepare an anode slurry with a solid content of 30%.

[0064] Subsequently, the anode slurry was coated onto a 20 μm thick copper current collector and dried under vacuum at 120 °C for 24 h.

[0065] Subsequently, a rolling process was performed to form an 80 μm thick negative electrode.

[0066] (2) Manufacture of batteries

[0067] Use stamping into 1.4875cm 2 The circular negative electrode and the counter electrode are cut into 1.7671cm 2 circular lithium metal thin films to fabricate coin half-cells. Specifically, an electrode assembly was fabricated using lithium meta...

Embodiment 2

[0069] An electrode assembly was fabricated by the same method as that of Example 1, except that carbon nanotubes (CNTs, 15 μm long) were used instead of VGCF for the linear structure.

Embodiment 3

[0071] An electrode assembly was fabricated by the same method as that of Example 1, except that for the linear structure, carbon nanofibers (CNF, 50 μm long) were used instead of VGCF.

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Abstract

The present invention relates to an electrode for an all-solid-state battery, comprising a solid electrolyte, and an all-solid-state battery, the electrode comprising: an electrode current collector;and an electrode active material layer formed on at least one surface of the electrode current collector, wherein the electrode active material layer comprises: a plurality of electrode active material particles; a solid electrolyte which is coated on at least parts of the surfaces of the plurality of electrode active material particles and connects the plurality of electrode active material particles to each other; and linear structures dispersed between the plurality of electrode active material particles. According to the present invention, the gas generated by the reaction of the electrodeactive material and the solid electrolyte is discharged from the electrode along the linear structures dispersed between the electrode active material particles, thereby easily removing the gas in the electrode. Therefore, the shortening problem of the battery life can be prevented by suppressing the increase in resistance at the electrode interface.

Description

technical field [0001] This application claims priority from Korean Patent Application No. 10-2017-0117375 filed in Korea on September 13, 2017, the contents of which are incorporated herein by reference. The present invention relates to an electrode for an all-solid battery including a solid electrolyte, and more particularly, to an electrode for an all-solid battery that easily discharges gas generated during charge and discharge. The invention also relates to an all-solid-state battery comprising said electrode. Background technique [0002] Lithium-ion batteries using liquid electrolytes have a structure in which the anode and cathode are separated by a separator, and when the separator is damaged by deformation or external impact, a short circuit may occur, causing danger such as overheating or explosion. Therefore, developing a solid electrolyte is a very important challenge to ensure safety in the field of lithium ion secondary batteries. [0003] A lithium secondar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/133H01M4/134H01M4/136H01M10/0525
CPCH01M4/131H01M4/133H01M4/134H01M4/136H01M10/0525H01M4/62H01M10/0562H01M10/0565Y02E60/10H01M4/366H01M4/625H01M2300/0082H01M2300/0068H01M2300/0071H01M2300/0085H01M4/13H01M2300/0091H01M4/624H01M10/52
Inventor 李廷弼金志映金孝植睦恩庚禹昇希郑慧利
Owner LG ENERGY SOLUTION LTD
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