A New Look at Lithium Cobalt Oxide in a Broad Voltage Range for Lithium-Ion Batteries

作者：Shu Jie^*; Shui Miao; Huang Fengtao; Ren Yuanlong; Wang Qingchun; Xu Dan; Hou Lu

来源：Journal of Physical Chemistry C, 2010, 114(7): 3323-3328.

DOI：10.1021/jp911994b

The electrochemical behaviors and lithium-storage mechanism of LiCoO(2), in a broad voltage window (1.0-4.3 V) are Studied by charge-discharge cycling, XRD, XPS, Raman, and HRTEM. It is found that the reduction mechanism of LiCoO, with lithium is associated with the irreversible formation of metastable phase Li(1+x)Co(II) (III)O(2-y) and then the final products of Li(2)O and Co metal. During the charging process, the Li(2)O/Co mixture can be oxidized into CoO, and then the LiO/CoO mixture can result in the formation of Co(3)O(4) in the higher-voltage region. Li(x)CoO(y) is the final product when the active material is charged to 4.3 V. During the subsequent cycles, the lithium uptake/release reactions ire related to the reversible conversion of Co <-> CoO <-> Co(3)O(4) <-> Li(x)CoO(y).

• 出版日期2010-2-25
• 单位宁波大学