锂电池正极材料1,4,5,8-四羟基-9,10-蒽醌的电化学性能

Electrochemical Performance of 1,4,5,8-Tetrahydroxy-9,10-anthraquinone as Cathode Material in Lithium Batteries

研究了一种新型有机醌类化合物1,4,5,8-四羟基-9,10-蒽醌(THAQ)及其氧化产物(O-THAQ)的电化学性能.循环伏安和充放电结果显示,在放电时材料中的羰基和羟基均被还原为烯醇锂盐(襒C—O-Li+)结构,其中羰基还原为烯醇锂盐结构的过程可逆.O-THAQ首次放电容量和循环性能都有显著提高,氧化产物的首次放电容量为250 mAh.g-1,20次循环容量为100 mAh.g-1.讨论了THAQ氧化前后性能差异的原因.

We investigated the use of a novel organic compound,1,4,5,8-tetrahydroxy-9,10-anthraquinone（THAQ）,and its oxidized product（O-THAQ） as cathode materials for lithium batteries.Cyclic voltammetric（CV） and charge-discharge tests of the two materials showed that during the discharge process a carbonyl-lithium enolate transformation and a hydroxyl-lithium enolate transformation occurred and the former reaction was reversible.The initial and 20th cycle capacities of O-THAQ were 250 and 100 mAh.g-1,respectively.These values were higher than those for THAQ,which showed that pre-oxidizing THAQ effectively improved its electrochemical performance.We propose a reason for this improvement.