【摘要】 用硫酸铈作氧化剂 ,通过液相法将普通的天然石墨进行氧化改性。改性后 ,除去了一些活性高的缺陷结构 ,提高了石墨结构的稳定性 ;在除去缺陷结构的同时 ,增加了纳米级微孔及通道的数目 ;另外 ,氧化时形成的氧化物层与石墨结构结合得比较紧 ,可作为致密的钝化膜 ,并防止石墨结构的破坏。这些因素的变化有利于锂的插入和脱出 ,抑制电解质的分解 ,导致可逆容量从 2 5 1mAh/ g增加到 3 4 0mAh/ g以上 ,第 1次循环的充放电效率达 80 %以上 ,前 1 0次循环的可逆容量没有衰减。该方法适宜于锂离子蓄电池负极材料的工业化生产。更多还原

【Abstract】 General natural graphite was modified by liquid-phase oxidation method using cerium sulfate as an oxidant.This method eliminated some imperfect structures with high activity and stabilized the graphite structure.When the imperfect structures were eliminated,the number of nano-meter micropores and channels was increased,and an oxide layer that bonded tightly with graphite structure was formed.This oxide layer could act as a dense passivating film and prevent graphite structure from being destroyed. Changes of these factors were benificial to the intercalation and deintercalation of lithium ion and to inhibit the decomposition of electrolyte molecules,thus the reversible capacity was enhanced from 251 mAh/g to more than 340 mAh/g.In addition,the coulombic efficiency in the first cycle can be above 80% and the reversible capacity doesn’t fade in the first 10 cycles.This method is suitable for the manufacture of anode material for lithium ion secondary batteries in industrial scale.更多还原