CPC H01M 4/366 (2013.01) [C01B 32/05 (2017.08); C01B 32/21 (2017.08); H01M 4/133 (2013.01); H01M 4/1393 (2013.01); H01M 4/587 (2013.01); H01M 10/0525 (2013.01); C01P 2002/02 (2013.01); C01P 2002/54 (2013.01); C01P 2004/84 (2013.01); C01P 2006/40 (2013.01); H01M 2004/027 (2013.01)] | 14 Claims |
1. A preparation method of a lithium-ion rechargeable battery negative electrode active material, the method comprising the following:
mixing a carbon material and an amorphous carbon material with an ionic liquid to obtain a mixture;
putting the mixture into a reaction kettle;
introducing a mixed gas of an inert carrier gas and a small organic molecule containing a doping element; and
keeping the mixture at 500° C. to 1200° C. for 1 hour to 12 hours to obtain a lithium-ion rechargeable battery negative electrode active material,
wherein the lithium-ion rechargeable battery negative electrode active material comprises a carbon core and a coating layer formed on a surface of the carbon core,
wherein a material of the coating layer comprises amorphous carbon and a doping element,
wherein the doping element comprises element nitrogen,
wherein the coating layer is of a single-layer structure,
wherein the doping element is dispersed in the amorphous carbon, and
wherein the doping element has a mass content in the coating layer of 0.1% to 20%.
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