Hard carbon negative electrode material for power lithium ion battery, and preparation method thereof

• Main Authors: PI TAO, SHI LEI, SHAO HAOMING, XIAO ZHIPING, JIANG WENCHANG
• Format: Patent
• Language: Chinese; English
• Published: 29.08.2017
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS THEREOF; ELECTRICITY; INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OFSOLID INORGANIC COMPOUNDS; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention provides a hard carbonnegative electrode material with low specific surface area for a power lithium ion battery, and a preparation method thereof. The material is prepared by the steps of adopting an organic macromolecule as a raw material, coarse crushing, preheating, fine crushing, grading, surface coating, and carbonizing. According to the hard carbonnegative electrode material prepared by the invention, the reversible capacity is higher than 500mAh/g, the pole piece compaction can reach 1.55g/cc, the initial efficiency for the first time is higher than 80 percent, and the 5C charge-discharge cycle life exceeds 2000 weeks. 本发明提供了种动力锂离子电池用低比表面积硬碳负极材料及其制备方法，该材料是以有机高分子为原材料，通过粗碎、预热处理、细碎、分级、表面包覆、碳化工艺制备而得。本发明制备的硬碳负极材料可逆容量高于500mAh/g，极片压实可达1.55g/cc，首次效率高于80%，5C充放循环寿命超过2000周。