Relationship between cycle life of Li(Mn2−xLix)O4−δ and oxygen deficiency δ
Relationship between cycle life of Li(Mn2−xLix)O4−δ and oxygen deficiency δ
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Li(Mn2−xLix)O4−δ的循环寿命与缺氧δ的关系
DOI：
10.1016/s0378-7753(99)00200-1
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发表时间：
1999
影响因子：
9.2
通讯作者：
K. Shizuka
中科院分区：
文献类型：
--
作者：
Y. Chida;H. Wada;K. Shizuka
我们用电化学和结晶学方法研究了Li(Mn2−xLix)O4−δ(名义x=0.02)尖晶石的循环寿命与氧缺位δ之间关系的定量细节，这是通过化学分析精确地确定的。我们发现，在25℃下进行第100次循环后，容量保持率随着缺氧量的增加而线性下降。比较了500次循环前后晶格参数的变化与电势曲线的变化。第500次循环后放电态结束时晶格参数的变化与缺氧δ有关。它们与电位曲线低压区的退化过程很好地吻合，该区域受氧损失的影响很大，并在第100次循环内迅速饱和。这些结果暗示了缺氧引入的Jahn-Teller离子Mn3+的影响。
We electrochemically and crystallographically investigated the quantitative details of relationship between cycle life of Li(Mn2−xLix)O4−δ(nominally x=0.02) spinel and oxygen deficiency δ which was precisely determined by chemical analysis. We found that capacity retention rate after the 100th cycle at 25°C is linearly decreased with increasing oxygen deficiency. The changes in lattice parameter before and after 500 times cycling test were compared with the changes in potential curves. The changes in lattice parameter at the end of discharged state after the 500th cycle depended on oxygen deficiency δ. They were in good accordance with the degradation in the low voltage region of potential curve, which was strongly affected by oxygen loss and rapidly saturated within about the 100th cycle. These results implied the influence of Jahn–Teller ion Mn3+introduced with oxygen deficiency.