Single-particle and secondary-particle mixed high-energy-density graphite negative electrode material and preparation method thereof

Abstract

The invention relates to a single-particle and secondary-particle mixed high-energy-density graphite negative electrode material and a preparation method thereof.The preparation method comprises the steps of crushing and drying an artificial graphite raw material to obtain coarse powder, finely grinding and shaping the coarse powder to obtain fine powder, performing high-temperature graphitizationtreatment on the fine powder to obtain a single-particle graphitized material, mixing the fine powder with a binder carrying out surface modification treatment under the protection of an inert gas toobtain secondary particles, carrying out fusion granulation treatment on the secondary particles to obtain a fusion material and then carrying out high-temperature graphitization treatment to obtaina secondary particle graphitized material, and mixing the single-particle graphitized material with the secondary-particle graphitized material to obtain a lithium ion battery negative electrode material. Through measurement, the high-energy-density graphite negative electrode material has excellent performances in the aspects of tap density, discharge capacity, first efficiency, secondary compaction of a pole piece and other indexes.

Description

technical field

[0001] The invention belongs to the field of negative electrode materials for lithium ion batteries, and in particular relates to a high-energy-density graphite negative electrode material mixed with single particles and secondary particles and a preparation method thereof. Background technique

[0002] As a secondary battery of green new energy, lithium-ion battery has high working voltage, long cycle life and fast charging and discharging speed, so it is widely used. Lithium-ion batteries are mainly composed of positive electrode materials, negative electrode materials, electrolytes, and separators. Negative electrode material is one of the key materials of lithium batteries, and its technology has become a research hotspot.

[0003] However, the tap density, discharge capacity, initial efficiency and secondary compaction of the anode material still need to be further improved. Contents of the invention

[0004] In order to solve the problems in the pri...

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