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Negative electrode piece and lithium ion battery

A technology of negative electrode sheet and negative electrode diaphragm, which is applied in the direction of battery electrodes, secondary batteries, circuits, etc., can solve the problems of sacrificing battery energy density, reducing the coating weight of active materials and compaction density, etc., to improve the distribution of pores, The preparation method is simple and the effect of great economic benefits

Inactive Publication Date: 2017-10-03
NINGDE AMPEREX TECH
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Problems solved by technology

However, reducing the coating weight and compaction density of the active material largely sacrifices the energy density of the battery

Method used

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  • Negative electrode piece and lithium ion battery
  • Negative electrode piece and lithium ion battery
  • Negative electrode piece and lithium ion battery

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Embodiment 1

[0031] (1) Preparation of the negative electrode sheet: Add the negative electrode active material graphite, CMC, Super P, LA-133 in a weight ratio of 94.5%: 2%: 0.4%: 3.1% into deionized water and mix and stir evenly to obtain a mixture with a certain flow Active material layer slurry was uniformly coated on both sides of the negative electrode current collector (electrolytic copper foil with a thickness of 9 μm), and dried to form an inner active material layer. Add Super P, CMC, and LA-133 into deionized water in a weight ratio of 65%:2%:33%, mix and stir evenly to obtain a functional layer slurry with certain fluidity, and apply the slurry evenly on the inner active layer. The surface of the material layer, with a thickness of 2 μm, is dried and cold-pressed to make a negative electrode sheet.

[0032] (2) Preparation of positive electrode sheet: NCM333, Super P, polyvinylidene fluoride (PVDF) are added in N-methylpyrrolidone (NMP) in a weight ratio of 94%: 3%: 3% and mixe...

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Abstract

The invention provides a negative electrode piece and a lithium ion battery. The negative electrode piece comprises a negative electrode current collector and a negative electrode diaphragm, and the negative electrode diaphragm is formed on one side or two sides of the negative electrode current collector. The negative electrode diaphragm comprises an inner active material layer which is located on the negative electrode current collector and is adjacent to the negative electrode current collector, contains a negative active material capable of removing lithium ions; and an outer functional layer located on the inner active material layer and located on one side, away from the negative electrode current collector, of the negative electrode diaphragm, the outer functional layer comprises super p and a binding agent, and does not contain a negative active material capable of removing lithium ions. The negative electrode piece can rapidly improve the low-temperature performance of the lithium ion battery, the power performance and the high-current fast-charging cycle performance.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a negative pole piece and a lithium ion battery. Background technique [0002] With the increasing popularity of lithium-ion batteries and the wider range of applications, people generally put forward higher requirements for the low-temperature performance, power performance and fast charging capability of lithium-ion batteries. Generally speaking, there are usually two solutions to solve such problems. One solution is to replace the design of the electrochemical system, including the positive electrode, negative electrode, and electrolyte. However, the redesign of key materials involves the matching of a large number of process technologies, the project development process is long, the labor cost is high, and the risk is great. Another solution is to reduce the coating weight and compaction density of the pole piece active material. However, reducing the coating weight and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/134H01M4/36H01M4/38H01M4/587H01M4/62H01M10/0525
CPCH01M4/133H01M4/134H01M4/366H01M4/386H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 王家政
Owner NINGDE AMPEREX TECH
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