Negative electrode material for 12V start-stop power supply, lithium ion battery and preparation method of lithium ion battery

Abstract

The invention discloses a negative electrode material for a 12V start-stop power supply, a lithium ion battery and a preparation method of the lithium ion battery, belongs to the technical field of automobile start-stop battery systems, and mainly solves the problems that the lithium ion battery cannot meet the requirement of cold start power at low temperature and the service life is quickly attenuated at high temperature. The negative electrode material is mainly characterized by comprising 90%-97% of a negative electrode active substance, 1%-3.5% of a conductive agent, 2%-3% of a binder and 0.5%-3% of a thickening agent; The lithium ion battery for the 12V start-stop power supply is prepared from the negative electrode material, wherein the raw materials in the negative electrode material are fully mixed to prepare negative electrode slurry, the negative electrode slurry is uniformly coated on the negative electrode current collector, and the negative electrode plate is prepared through cold pressing. The negative electrode material has the characteristics of reducing cathode impedance, reducing contact impedance and further improving lithium ion diffusion, and is mainly used for 12V start-stop lithium ion batteries.

Description

technical field [0001] The invention belongs to the technical field of automobile start-stop batteries, and in particular relates to a negative electrode material for a 12V start-stop power supply, a lithium ion battery and a preparation method thereof. Background technique [0002] With the gradual reduction of national new energy vehicle subsidies and the gradual implementation of the double credit policy, the country has proposed a fuel consumption target of 5L / 100km for vehicles in 2020. In order to meet the target requirements of fuel consumption limits, the automotive industry must adopt various technical solutions to improve energy-saving effects. [0003] In terms of assembly, there is less and less space to meet the energy-saving effect by simply improving the combustion efficiency of the internal combustion engine. Vehicle hybridization and pure electrification are the best technical routes. Although electrification is the ultimate goal of automobiles, it cannot b...

AI Technical Summary

Problems solved by technology

As a micro-mixed power supply, the start-stop battery has high requirements for high-rate discharge performance at low temperatures, and it is difficult for ordinary graphite to meet its high-standard use requirements at low temperatures

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