Significant improvement in performances of LiNi0.5Mn1.5O4 through surface modification with high ordered Al-doped ZnO electro-conductive layer
Significant improvement in performances of LiNi0.5Mn1.5O4 through surface modification with high ordered Al-doped ZnO electro-conductive layer
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DOI：
10.1016/j.apsusc.2015.01.120
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发表时间：
2015-03
影响因子：
6.7
通讯作者：
Sun Hongdan;Xia Bingbo;Weiwei Liu;Fang Guoqing;Wu Jingjing;W. Haibo;Ruixue Zhang;Shingo Kaneko;Junwei Zheng;Hongyu Wang;De-cheng Li
中科院分区：
文献类型：
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作者：
Sun Hongdan;Xia Bingbo;Weiwei Liu;Fang Guoqing;Wu Jingjing;W. Haibo;Ruixue Zhang;Shingo Kaneko;Junwei Zheng;Hongyu Wang;De-cheng Li
采用溶胶-凝胶法制备了Al掺杂ZnO（AZO）包覆LiNi 0. 5 Mn 1. 5 O 4（LNMO）。透射电子显微镜（TEM）分析表明，生长在LNMO表面的AZO层是高度有序的。电化学性能测试结果表明，AZO涂层的LNMO电极在10 ℃的高倍率下仍表现出比裸LNMO和ZnO涂层LNMO电极更好的倍率性能。AZO涂层的LNMO电极的放电容量仍然可以达到114.3 mAh g−1，约为其0.1 C下放电容量的89%。此外，由于AZO涂层的保护作用，AZO涂层的LNMO电极在高温下的高倍率循环性能显示出显着的改善。该电极提供120.3 mAh g− 1的容量，在50 °C下50次循环中在5 C下的容量保持率为95%。电化学阻抗谱（EIS）分析表明，与裸LNMO和ZnO包覆LNMO相比，AZO包覆LNMO具有最低的电荷转移电阻，这可能是提高LNMO倍率性能的原因。
Al-doped ZnO (AZO)-coated LiNi0.5Mn1.5O4(LNMO) was prepared by sol–gel method. Transmission electron microscopy (TEM) analysis indicates that AZO layer grown on the surface of LNMO is high ordered. The results of electrochemical performance measurements reveal that the AZO-coated LNMO electrode displays the best rate capability compared with the bare LNMO and ZnO-coated LNMO, even at a high rate of 10 C. The discharge capacity of the AZO-coated LNMO electrode can still reach 114.3 mAh g−1, about 89% of its discharge capacity at 0.1 C. Moreover, AZO-coated LNMO electrode shows a remarkable improvement in the cyclic performance at a high rate at elevated temperature due to the protective effect of AZO coating layer. The electrode delivers a capacity of 120.3 mAh g−1with the capacity retention of 95% at 5 C in 50 cycles at 50 °C. The analysis of electrochemical impedance spectra (EIS) indicates that AZO-coated LNMO possesses the lowest charge transfer resistance compared to the bare LNMO and ZnO-coated LNMO, which may be responsible for improved rate capability.