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Li-M-X-based solid-state lithium battery positive electrode and preparation method thereof

A technology of solid lithium and solid electrolyte, which is applied in the positive electrode of Li-M-X based solid lithium battery and its preparation field, can solve the problems of large charge transfer resistance, inability to disperse evenly with each other, unfavorable large-scale production of lithium battery, etc., and achieve reduction Charge transfer resistance, the effect of improving electrochemical performance

Pending Publication Date: 2021-08-20
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The positive electrode prepared by this powder dry pressing method has poor contact between the electrode material and the solid electrolyte, which will generate a large charge transfer resistance and affect the electrochemical performance of the battery.
Moreover, the various components in the composite positive electrode material are likely not to be uniformly dispersed with each other, resulting in poor ionic and electronic conductivity in the positive electrode part of the battery.
In addition, the preparation of positive electrodes for lithium batteries by powder dry pressing is not conducive to commercial mass production.

Method used

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  • Li-M-X-based solid-state lithium battery positive electrode and preparation method thereof
  • Li-M-X-based solid-state lithium battery positive electrode and preparation method thereof
  • Li-M-X-based solid-state lithium battery positive electrode and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Dissolve 2% polymethyl methacrylate in an appropriate amount of toluene solution.

[0031] (2) 75% nickel-cobalt-manganese ternary material, 15% Li 3 InCl 6 A solid electrolyte and 8% Ketjen Black were added to the solution obtained in step (1) to prepare a slurry.

[0032] (3) Coat the slurry obtained in (2) evenly on the carbon-coated aluminum foil, and then dry it at 60° C. for 24 hours.

[0033] (4) The dried positive electrode sheet is sintered and then compacted.

[0034] The positive electrode of the obtained Li3InCl6-based solid-state lithium battery is discharged between 2.5 and 4.2V, and the first cycle capacity is 84mA h g -1 , The capacity retention rate after 100 cycles of charge and discharge is 75%.

Embodiment 2

[0036] (1) Dissolve 1% polymethyl methacrylate in an appropriate amount of toluene solution.

[0037] (2) 75% nickel-cobalt-manganese ternary material, 15% Li 3 InCl 6 A solid electrolyte and 9% Ketjen Black were added to the solution obtained in step (1) to prepare a slurry.

[0038] (3) Apply the slurry obtained in (2) evenly on the charcoal-coated filter, and then dry it naturally.

[0039] (4) The dried positive electrode sheet is sintered and then compacted.

[0040] The obtained Li 3 InCl 6 The positive electrode of the solid-state lithium battery, the battery formed is discharged between 2.5 ~ 4.2V, and the capacity of the first cycle is 62mA h g -1 , The capacity retention rate after 100 cycles of charge and discharge is 57%.

Embodiment 3

[0042] (1) Dissolve 3% polymethyl methacrylate in an appropriate amount of toluene solution.

[0043] (2) 75% nickel-cobalt-manganese ternary material, 15% Li 3 InCl 6 A solid electrolyte and 7% Ketjen Black were added to the solution obtained in step (1) to prepare a slurry.

[0044] (3) Coat the slurry obtained in (2) evenly on the charcoal-coated filter, and then dry it at 60° C. for 24 hours.

[0045] (4) The dried positive electrode sheet is sintered and then compacted.

[0046] The obtained Li 3InCl 6 The positive electrode of the base solid-state lithium battery, the battery formed is discharged between 2.5 ~ 4.2V, and the capacity of the first cycle is 57mA h g -1 , The capacity retention rate after 100 cycles of charge and discharge is 89%.

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Abstract

The invention relates to the field of solid-state lithium batteries, and especially relates to a Li-M-X-based solid-state lithium battery positive electrode and a preparation method thereof. The method comprises the following steps: adding a positive electrode material into a solvent to prepare positive electrode slurry, coating a carbon-coated aluminum foil, aluminum foil or copper foil with the positive electrode slurry (including common coating modes such as spraying), and then carrying out drying processes such as natural airing or drying to obtain a positive plate. The positive electrode material comprises a positive electrode active material, Li-M-X-based solid electrolyte, a conductive agent and a binder. Compared with the Li-M-X-based solid-state lithium battery positive electrode prepared by powder dry pressing, the Li-M-X-based solid-state lithium battery positive electrode prepared by the coating method has the advantages that each component of the positive electrode material is uniformly dispersed, the charge transfer resistance between the electrode material and the solid electrolyte can be effectively reduced, and the electrochemical performance of the battery is improved. The positive electrode of the Li-M-X-based solid-state lithium battery and the preparation method thereof provided by the invention are compatible with the coating process of the existing lithium ion battery, and can adapt to commercial large-scale production.

Description

technical field [0001] The invention relates to the field of solid-state lithium batteries, in particular to a positive electrode of a Li-M-X-based solid-state lithium battery and a preparation method thereof. Background technique [0002] Inorganic all-solid-state lithium batteries have the advantage of high energy density and are considered to be promising next-generation energy storage technologies. Among them, Li 3 MX 6 The system solid electrolyte has high ionic conductivity, good chemical and electrochemical stability, and is an excellent solid electrolyte, which can well meet the needs of solid-state lithium batteries. Li-M-X based solid-state lithium battery positive electrode active material can generally use lithium cobalt oxide, nickel cobalt manganese ternary material, lithium iron phosphate or some other positive electrode materials. However, the contact between the solid-state electrolyte and these cathode materials is a solid-to-solid contact, unlike conven...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/136H01M4/1397H01M4/58H01M10/052
CPCH01M4/0419H01M4/136H01M4/1397H01M4/582H01M10/052H01M2004/028Y02E60/10
Inventor 王恺张俊张文魁黄辉夏阳甘永平
Owner ZHEJIANG UNIV OF TECH
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