新型锂电池正极材料聚有机二硫化物的研究

Investigation of novel poly organic disulfides as cathode materials for lithium batteries

合成了一种新型有机二硫化物,并通过电化学聚合方法合成其聚合物.其中,二硫键的氧化还原性质通过循环伏安法进行研究.研究表明,氧化峰与还原峰的电位间距为180 mV,充分表明了它的氧化还原可逆性良好.同时,在实验中发现微观聚3-双亚甲基噻吩二硫化物的电子状态是导致阳极失活和再活的主要因素.以聚3-双亚甲基噻吩二硫化物为正极材料组装成电池,测试结果显示在充放电5圈后的平均比容量为230 mAh.g-1,其值是钴酸锂的2倍之多.

A new organodisulfide 3-thienylmethyl disulfide has been successfully synthesized and its polymer poly 3-thienylmethyl disulfide was synthesized by electrochemical polymerization. The electrochemical properties of S-S bonds redox behavior in the disulfides have been investigated in 0.1 mol · L^- 1 [ Bu4 N ] [ PF6 ]/CH3 CN solu- tion. The separation of anodic and cathodic peak potentials for poly 3-thienylmethyl disulfide is 180 mV and the poly 3-thienylmethyl disulfide shows an excellent electrochemical reversibility. Moreover, it is found that differ- ent state of micro structure （ w-electron action） is primary cause of the deactivation and reactivation of poly 3- thienylmethyl disulfide on glass carbon electrode. The average specific capacity of poly 3-thienylmethyl disulfide obtained after 5 cycles is 230 mAh · g^-1 and about 2 times higher than that of LiCoO2.