锂离子蓄电池Co3O4负极材料

在Co3O4中加入一定量的金属粉末并进行球磨,制备了锂离子蓄电池用Co3O4负极材料,对分别不加和加入Fe粉、Ni粉以及Mn粉的Co3O4负极材料进行了电化学性能测试,结果表明Co3O4粉末单独作为锂离子蓄电池负极时,初次充放电效率低,只有66%,循环性能差;加入铁粉后效果不明显;加入镍粉后电极的初次充放电效率和循环性能得到明显改善,但10次循环后可逆容量衰减较快。加入锰粉后电极的初次充放电效率提高到77%,循环性能好,20次循环后的可逆容量还保持在713 mAh/g,库仑效率在97%以上。同时对加入镍和锰后Co3O4与锂反应的机理进行了讨论。

Study on the Co3O4 negative materials for lithium-ion batteries

The Co3O4 negative materials were obtained by adding metal powder such as Fe,Ni or Mn to Co3O4 using mechanical milling.As a result,Co3O4 showed a low initial coulombic efficiency,66%,and poor cycle performance when it was used as negative material by itself.The Fe powder had no effect when added to Co3O4.When adding the powder of Ni,it showed improvement in initial coulombic efficiency.But the reversible capacity faded fast after 10 cycles.When adding the powder of Mn,it showed a high initial coulombic efficiency,77%,and excellent cycle performance,713 mAh/g after 20 cycles.The coulombic efficiency was above 97%.The reaction mechanism of cobalt oxide with lithium was discussed after adding Ni or Mn powders.