The Synergistic Effects of Li2SiO3-Coating and Si4+-Doping for LiNi0.5Mn0.5O2 Cathode Materials on the Structure and the Electrochemical Properties
The Synergistic Effects of Li2SiO3-Coating and Si4+-Doping for LiNi0.5Mn0.5O2 Cathode Materials on the Structure and the Electrochemical Properties
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Li2SiO3包覆和Si4掺杂对LiNi0.5Mn0.5O2正极材料结构和电化学性能的协同影响
DOI：
10.1149/2.0131713jes
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发表时间：
2017
影响因子：
3.9
通讯作者：
Cui Xiaoling
中科院分区：
文献类型：
--
作者：
Yang Guowei;Jia Guofeng;Shangguan Xuehui;Zhu Zenghu;Peng Zhengjun;Zhuge Qin;Li Faqiang;Cui Xiaoling
采用合成锂化法成功制备了zLi2SiO3@LiNi0.5Mn0.5O2（z= 0，0.03，0.05，0.08）正极材料。系统分析了其结构和电化学性能。结构分析结果表明，Li 2SiO 3在材料表面得到了良好的包覆，部分Si 4+掺杂到材料的结构中。此外，电化学测试结果表明，3mol%Li2SiO3包覆的LiNi0.5Mn0.5O2电极具有最好的电化学性能，包括最高的容量、最好的循环稳定性和倍率性能。3mol%Li2SiO3涂层使60 C下的容量保持率提高了24%.此外，3 mol% Li 2 SiO 3@LiNi 0.5 Mn 0.5 O 2阴极材料的所有电阻都比未掺杂材料的电阻小得多，这意味着它具有更快的锂离子迁移速率。这一发现与计算结果吻合得很好。总之，Li 2SiO 3包覆和Si 4+掺杂可以降低Li/Ni混合，提高结构稳定性，降低极化，降低迁移阻力，提高锂离子的迁移速率，从而改善LiNi0.5Mn0.5O2的电化学性能。
zLi 2 SiO 3@ LiNi 0.5 Mn 0.5 O 2 (z= 0, 0.03, 0.05, 0.08)("@" means" was coated on the surface of") cathode materials had been successfully prepared via a syn-lithiation strategy. The structure and the electrochemical properties were analyzed systematically. The results of the structural analysis showed that Li 2 SiO 3 was well coated on the surface of the material, and partial of Si 4+ was doped into the structure. In addition, the results of the electrochemical measurements suggest that 3 mol% Li 2 SiO 3-coated LiNi 0.5 Mn 0.5 O 2 electrode has the best electrochemical performance, including the highest capacity, best cycle stability and rate performance. The capacity retention is improved about 24% by 3 mol% Li 2 SiO 3 coating at 60 C. Additionally, all the resistances of the 3 mol% Li 2 SiO 3@ LiNi 0.5 Mn 0.5 O 2 cathode material are considerably smaller than that of the un-doped material, which means it has a faster lithium-ion migration rate. This finding is in good agreement with the calculated results. In summary, Li 2 SiO 3 coating and Si 4+ doping can lower Li/Ni mixing, increase the structural stability, reduce polarization, decrease the migration resistance and improve the migration rate of the lithium-ion which, in turn, improves the electrochemical properties of LiNi 0.5 Mn 0.5 O 2.
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影响因子：
3.9
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通讯作者：
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影响因子：
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作者：
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影响因子：
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作者：
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影响因子：
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作者：
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