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Positive plate and preparation method and application thereof

A technology of positive electrode plate and positive electrode material, applied in the field of positive electrode plate and its preparation, can solve the problems of low compaction density, large positive electrode plate porosity, poor mechanical strength of gel electrolyte, etc., and achieve compaction density and lithium ion conductivity. Increased molding temperature and reduced porosity for ease of industrial application

Active Publication Date: 2020-02-21
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is beneficial to improve the interfacial contact between the electrolyte and the positive electrode material, but the poor mechanical strength and low conductivity of the gel electrolyte are still a problem to be solved
[0005] Although the above-mentioned documents disclose some positive plates and their preparation methods, there are still some positive plate porosity, low compaction density, low lithium ion conductivity, high interface resistance between the solid electrolyte and the positive electrode material, and the preparation process of the positive plate requires For the problem of high temperature and high pressure conditions, the current research is still mainly focused on the improvement of the performance of solid electrolyte materials, and there are still few technical researches on the structure and preparation of the positive plate of the all-solid-state battery, and the wettability and contact of the solid-state electrode have yet to be solved. Therefore, it is still of great significance to develop a preparation method of a positive electrode plate with lower porosity, higher compacted density and lithium ion conductivity and its products

Method used

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  • Positive plate and preparation method and application thereof
  • Positive plate and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Preparation method of positive plate:

[0069] (1') Lithium tetrafluoroborate and polycarbonate powder are mixed according to the mass ratio of 2:1, and ball milled to obtain a mixture;

[0070] (2') Mix the mixture, conductive agent, binder and solvent obtained in step (1'), and then ball mill to obtain a mixed slurry. The mass ratio of the mixture, conductive agent, binder and solvent is 1:2:2:7; the conductive agent is carbon black, the binder is polytetrafluoroethylene, and the solvent is NMP;

[0071] (3') mixing the mixed slurry obtained in step (2') with the positive electrode material and the solid electrolyte, and ball milling to obtain the slurry, the mass ratio of the mixed slurry, the positive electrode material and the solid electrolyte is 0.15:0.8:0.05, The positive electrode material is lithium cobalt oxide, and the solid electrolyte is lithium lanthanum zirconium oxide;

[0072] (4') Coating the slurry obtained in step (3') on the current collector, dr...

Embodiment 2

[0075] In this example, the mass ratio of lithium tetrafluoroborate and polycarbonate powder in Example 1 is replaced by 3:1; other conditions are exactly the same as those in Example 1.

Embodiment 3

[0077] In this example, the mass ratio of lithium tetrafluoroborate and polycarbonate powder in Example 1 is replaced by 1:1; other conditions are exactly the same as those in Example 1.

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Abstract

The invention relates to a positive plate and a preparation method and application thereof. In the preparation process of the positive plate, a fluxing agent and a compounding agent are added, and thefluxing agent is lithium tetrafluoroborate; and the compounding agent comprises polycarbonate powder and / or polymethyl methacrylate. By adding the fluxing agent and the compounding agent, the formingtemperature of the positive plate is effectively reduced. Meanwhile, pores in the positive plate can be filled, and the porosity of the positive plate is reduced, so that the interface resistance isreduced, the lithium ion conductivity is improved, the compaction density of the positive plate is increased, and the volume energy density of the positive plate is increased.

Description

technical field [0001] The invention relates to battery materials, in particular to a positive plate and its preparation method and application. Background technique [0002] The electrodes and electrolytes of solid-state batteries are made of solid materials. The solid-state electrolyte is non-flammable, non-corrosive, non-volatile, and non-leakage. It also overcomes the phenomenon of lithium dendrites. Even if it is used at a higher temperature, it will not fire, and thus greater safety. However, there is no infiltration of liquid in solid-state batteries, and there are inevitably pores between solid materials. Due to the poor contact of the interface, the solid-solid interface formed between the electrode and the solid electrolyte in a solid-state lithium battery has a higher contact resistance. Compatibility and interfacial stability also significantly affect the cycle performance and rate capability of solid-state lithium batteries. On the other hand, since the solid-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/131H01M10/0525H01M10/058
CPCH01M4/131H01M4/1391H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 谭强强王鹏飞
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI