Effects of aluminium and sodium co-doping on the structural and electrochemicalperformances of the spinel LiMn 2 O 4 cathode materials
Effects of aluminium and sodium co-doping on the structural and electrochemicalperformances of the spinel LiMn 2 O 4 cathode materials
复制标题
铝钠共掺杂对尖晶石LiMn 2 O 4 正极材料结构和电化学性能的影响
DOI：
10.1049/mnl.2016.0037
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发表时间：
2016
影响因子：
1.3
通讯作者：
Shunhua Xiao
中科院分区：
文献类型：
--
作者：
Yuzhu Li;Yanfang Mao;Taotao Zhan;Chao Li;Shunhua Xiao
采用溶胶-凝胶法合成了锂离子电池正极材料尖晶石LiMn 2 O 4、LiAl0.1Mn1.9O4和Li0.94Na0.06Al0.1Mn1.9O4材料。采用X射线衍射、扫描电镜和电子衍射等方法研究了铝钠共掺杂材料的结构、形貌和电化学性能。结果表明，适量的Al和Na掺杂不会改变LiMn 2 O 4的尖晶石结构。这些材料具有良好的结晶性，并且尺寸约为150 nm。Li0.94Na0.06Al0.1Mn1.9O4在0.5C下的首次放电容量为113.8mAh/g。与LiMn 2 O 4相比，Li0.94Na0.06Al0.1Mn1.9O4的5C放电容量提高了46.8%，达到107.5mAh/g。显然，铝和钠共掺杂是提高LiMn 2 O 4倍率性能的一种非常有效的方法。
The lithium‐ion battery cathode materials spinel LiMn2O4, LiAl0.1Mn1.9O4and Li0.94Na0.06Al0.1Mn1.9O4materials are synthesised by sol–gel method. The structure, morphology and electrochemical performances of the aluminium and sodium co‐doped materials are studied by X‐ray diffraction measurement, scanning electron microscopy, and Electron diffraction spectroscopy, respectively. The results reveal that appropriate amount doping of aluminium and sodium does not change the spinel structure of LiMn2O4. Those materials have a good crystallinity and the sizes are approximately 150 nm. The initial discharge capacity of Li0.94Na0.06Al0.1Mn1.9O4is 113.8 mAh/g at 0.5 C. Compared with the rate capability of LiMn2O4, the discharge capacity of 107.5 mAh/g at 5 C for Li0.94Na0.06Al0.1Mn1.9O4has 46.8% improvement. Obviously, aluminium and sodium co‐doping is a very effective way to improve LiMn2O4rate capability.