Multifunctional composite negative plate for rechargeable solid battery, preparation method and secondary battery

Abstract

The invention discloses a multifunctional composite negative plate for a rechargeable solid battery. The multifunctional composite negative plate comprises a negative electrode current collector layer, a negative electrode ion conduction electronic insulation layer and a negative electrode active material layer positioned between the negative electrode current collector layer and the negative electrode ion conduction electronic insulation layer. The negative electrode active material layer is composed of a plurality of negative electrode active material assemblies. The plurality of negative electrode active material assemblies are distributed in a two-dimensional laminated structure or a three-dimensional laminated structure. Different functions of different negative electrode active material assemblies are fully exerted. Comprehensive performance of the battery is considered. The negative ion conduction electronic insulation layer can realize ion conduction and electronic insulation functions. The introduction of a liquid electrolyte and internal short-circuit self-discharge are avoided. The safety of the battery is improved. The multifunctional composite negative plate and the secondary battery which have comprehensive excellent properties such as energy density, safety, rate capability, high and low temperature characteristics, service life, cycle life and the like are obtained.

Description

technical field [0001] The invention belongs to the field of electrochemical energy storage devices and new energy materials, and relates to a multifunctional composite negative electrode sheet for a rechargeable solid battery, a preparation method and a secondary battery. Background technique [0002] The traditional lithium-ion battery negative electrode sheet is mainly composed of negative electrode current collector layer and negative electrode active material layer. The negative electrode current collector mainly realizes structural support and electron drainage. The negative electrode active material layer is mainly porous. In the state of dry electrode sheet or under the condition of no electrolyte injection and infiltration, the porous structure electrode sheet composed of negative electrode active material, granular / linear electronic conductive additive and binder cannot realize the ion transport function, and can only conduct If electrons are passed through, the ba...

AI Technical Summary

Problems solved by technology

[0002] The traditional lithium-ion battery negative electrode sheet is mainly composed of negative electrode current collector layer and negative electrode active material layer. The negative electrode current collector mainly realizes structural support and electron drainage. The negative electrode active material layer is mainly porous. In the state of dry electrode sheet or under the condition of no electrolyte injection and infiltration, the porous structure electrode sheet composed of negative electrode active material, granular / linear electronic conductive additive and binder cannot realize the ion transport function, and can only conduct If the electrons are passed through, the battery cannot work normally. Therefore, the existing lithium-ion battery negative electrode cannot be directly applied to solid-state batteries.

[0003] In addition, traditional secondary batteries, such as lithium-ion batteries, have a flowable organic liquid electrolyte inside, and the positive electrode, separator, negative electrode, and liquid electrolyte in the lithium-ion battery all have a single function of independent driving Components cannot be fused or replaced with each other, and the organic liquid electrolyte is flammable, which poses a safety hazard. The injection of the organic liquid electrolyte has strict environmental requirements. Therefore, in order to improve the safety of the battery, it is necessary to reduce the amount of liquid electrolyte or not use it. Flammable liquid electrolyte, if the amount of liquid electrolyte is reduced, the performance of the battery will be affected, and if the liquid electrolyte is not added, the battery will basically not work normally

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