Positive electrode plate and lithium ion battery

Abstract

The invention provides a positive electrode plate and a lithium ion battery. The positive electrode plate comprises a positive current collector and a positive slurry deposited on the surface of the positive current collector. The positive current collector is a foamed aluminum foil. The positive slurry comprises, in percentage by weight, 92%-98% of positive active substance, 0.05%-2% of conductive agent, 1%-2.5% of PVDF and 0.05%-2% of single-walled carbon nanotube. The lithium ion battery comprises a positive electrode plate and the negative electrode plate. The positive electrode plate comprises a positive current collector and a positive slurry deposited on the surface of the positive current collector. The negative electrode plate comprises a negative current collector and a negative slurry deposited on the surface of the negative current collector. The positive slurry comprises, in percentage by weight, 92%-98% of positive active substance, 0.05%-2% of conductive agent, 1%-2.5% of PVDF and 0.05%-2% of single-walled carbon nanotube. The negative slurry comprises, in percentage by weight, 93%-96% of positive active substance, 0.05%-2% of conductive agent, 1%-3% of LA133.

Description

[0001] 【Technical field】 [0002] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a positive pole piece and a lithium ion battery. [0003] 【Background technique】 [0004] The increasingly serious energy shortage and environmental problems make the development of electric vehicles increasingly urgent. Lithium-ion batteries, as the core components of electric vehicles, put forward higher requirements for their rate performance and cycle performance. At present, the advantage of using metal foil with a smooth surface as a current collector is that it has excellent electrical conductivity and fast electron transmission speed. However, it is difficult to meet the requirements of rate performance and cycle performance, especially for cylindrical lithium-ion batteries, which will have problems such as high rate temperature rise, long-term cycle electrolyte decomposition, and cycle life attenuation. This is because although the abo...

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Problems solved by technology

However, it is difficult to meet the requirements of rate performance and cycle performance, especially for cylindrical lithium-ion batteries, there will be problems such as high rate temperature rise, long-term cycle electrolyte decomposition, and cycle life attenuation.

This is because although the above method improves the material’s deintercalation of lithium ions and speeds up the current speed, the structural characteristics of the pole piece itself hinder the diffusion rate of lithium ions, so that the rate performance and cycle performance of the battery cannot be further improved.

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