Improving electrochemical properties of spinel lithium titanate by incorporation of titanium nitride via high-energy ball-milling
Improving electrochemical properties of spinel lithium titanate by incorporation of titanium nitride via high-energy ball-milling
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DOI：
10.1016/j.jpowsour.2012.03.088
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发表时间：
2012-08
影响因子：
9.2
通讯作者：
Jiwei Zhang;Jingwei Zhang;Wei Cai;Fenli Zhang;Laigui Yu;Zhishen Wu;Zhijun Zhang
中科院分区：
文献类型：
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作者：
Jiwei Zhang;Jingwei Zhang;Wei Cai;Fenli Zhang;Laigui Yu;Zhishen Wu;Zhijun Zhang
采用高能球磨法制备了Li 4 Ti 5 O 12/TiN纳米复合材料（LTO-TiN-1B、LTO-TiN-2B、LTO-TiN-4 B和LTO-TiN-8B）。所有球磨样品表现出显着改善的电化学性能比原始Li 4 Ti 5 O 12。特别地，LTO-TiN-2B电极在20 C的充电/放电速率下具有130 mA h g-1的高容量，并且在10 C下1000次循环后的容量保持率为85%，显示出最佳的电化学性能和作为高倍率锂离子电池负极材料的巨大潜力。透射电子显微镜和X射线衍射结果表明，在LTO表面生成了非晶态TiN。电化学性能的改善可能归因于TiN，它可以显着提高纳米复合材料的电子导电性。
Li4Ti5O12/TiN nanocomposites are fabricated through high-energy ball-milling of the mixture of spinel lithium titanate and TiN powder with different mass ratios of 100:1, 100:2, 100:4, and 100:8 (resultant nanocomposites are denoted as LTO–TiN-1B, LTO–TiN-2B, LTO–TiN-4B, and LTO–TiN-8B). All ball-milled samples exhibit markedly improved electrochemical properties than pristine Li4Ti5O12. Particularly, LTO–TiN-2B electrode has a high capacity of 130 mA h g−1at a charge/discharge rate of 20C and the capacity retention was 85% after 1000 cycles at 10C, showing the best electrochemical performance and great potential as an anode material for high-rate lithium-ion batteries. The transmission electron microscopy and X-ray diffraction results indicate that amorphous TiN is generated on the surface of LTO. The improved electrochemical performance may be attributed to TiN which can significantly enhance the electronic conductivity of the nanocomposites.