Lithium-supplementing negative pole piece and lithium ion battery thereof

Abstract

The invention belongs to the technical field of batteries, and particularly relates to a lithium- supplementing-treated negative pole piece and a lithium ion battery thereof. The lithium-supplementingnegative pole piece provided by the invention comprises a negative current collector and a negative active material layer which is arranged on at least one surface of the negative current collector and contains a negative active material, a lithium supplementing layer is arranged on the surface, far away from the current collector, of the negative active material layer, and the lithium supplementing layer comprises a lithium supplementing region and a gap region; the lithium supplementing region and the gap region are connected with each other in sequence, the lithium supplementing region andthe gap region meet the condition that A/(A+B) is larger than or equal to 3.3*10<-3> and smaller than 0.98, A is the width of the lithium supplementing region, B is the width of the gap region, and Aand B are measured values in the extending direction of connection of the lithium supplementing region and the gap region. According to the negative pole piece provided by the technical scheme, the heating problem of the pole piece is effectively solved, the electrolyte can more effectively infiltrate the negative pole piece after the lithium ion battery is filled with the electrolyte through thechannel formed by the lithium supplementing region and the gap region, the energy density of the battery is improved, the cycle life of the battery can be prolonged, and the dynamic performance of the battery can be improved.

Description

technical field [0001] The invention belongs to the technical field of batteries, and more specifically relates to a negative pole piece treated with lithium supplementation and a lithium ion battery thereof. Background technique [0002] With the popularity of new energy vehicles, people have higher and higher requirements for their power batteries. For example, batteries are required to have high energy density, long cycle life and stable performance, as well as fast charging capabilities. [0003] At present, it is usually used to improve the cycle performance and energy density of lithium-ion batteries by optimizing the performance of positive and negative electrode materials. The negative electrode is an important part of the lithium-ion battery, and the electrochemical performance of the lithium-ion battery can be effectively improved by improving the cycle stability and energy density of the negative electrode. In industrial production, in order to increase the energ...

AI Technical Summary

Problems solved by technology

However, the process and technology of lithium supplementation technology often lead to the generation of a large amount of reaction heat, which in turn affects the cycle life, energy density and kinetic performance of lithium-ion batteries.

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