关键词: 纳米钴基氧化物, 锂离子电池, 负极材料, XRD方法

Abstract: Nanosized cobalt-based oxide (Co 3O 4, CoB 1.36 O 2.8 and CoB 0.5 Al 0.1 O 1.5 ) samples were prepared by rheological phase method and were tested as anodes in secondary lithium batteries. The cells were cycled between 0.01V and 3.00 V. The best electrochemical performance was obtained from the Li/Co 3O 4 cell, which retained 95% of its initial capacity (931 mAh/g) after 30 cycles. The doping of B, Al reduced the reversible capacity during the first discharge/charge cycle, and the quantity of reversible capacity reduced with B, A1 increasing. The modifying structures at difference charge and discharge states were investigated by ex situ XRD method. The results indicated which Li reacting from the classical Li insertion/deinsertion or Li-alloying processe, involves the formation/decomposition process of Li 2O and the reduction and oxidation of coblat oxides.

Key words: Cobalt-based oxides, Lithium ion batteries, Negative electrode materials, XRD method