Graphite negative electrode material, lithium ion battery, preparation method and application

Abstract

The invention discloses a graphite negative electrode material, a lithium ion battery, a preparation method and application. The preparation method of the material comprises the steps of (1) crushingand shaping an artificial graphite raw material to prepare powder; 2, graphitizing the powder to obtain a material A; 3, screening the material A to obtain a material B; (4) carrying out surface coating modification treatment on a mixture of the material B and a binder to obtain a material C; and (5) carbonizing the material C to obtain the product. The graphite negative electrode material disclosed by the invention has relatively high tap density and relatively high battery capacity, various characteristics interact with one another, the comprehensive advantages of the material are improved,the characteristics of high capacity and high compaction are ensured, and the high-rate performance of the material is improved; and the preparation method facilitates improvement of the low-temperature electrical performance of the graphite negative electrode material of the lithium ion battery, and is simple in process, low in production cost and suitable for industrial production.

Description

technical field

[0001] The invention relates to a graphite negative electrode material, a lithium ion battery, a preparation method and an application. Background technique

[0002] With its advantages of high specific energy, high working voltage, fast charging and discharging, long cycle life, safety and pollution-free, lithium-ion batteries have successfully replaced other secondary batteries and become the main energy source in the 3C market, and have greatly promoted the development of electric vehicles. The industrialization process of automobile EV and HEV, with our country's strong support in the field of new energy, a series of related subsidy policies are advancing;

[0003] At present, the first obstacle facing the large-scale industrialization of pure electric vehicles is the problem of "mileage anxiety". For pure electric vehicles, the cruising range is determined by the energy density of the power battery system, so the energy density of the power system has b...

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