Improving the cathode properties of Ni-rich LiNi0.6Co0.2Mn0.2O2 at high voltages under 5 C by Li2SiO3 coating and Si4+ doping
Improving the cathode properties of Ni-rich LiNi0.6Co0.2Mn0.2O2 at high voltages under 5 C by Li2SiO3 coating and Si4+ doping
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DOI：
10.1016/j.jallcom.2018.05.226
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发表时间：
2018-09
影响因子：
6.2
通讯作者：
Peng Zhengjun;Guowei Yang;Faqiang Li;Zhu Zenghu;Zeyu Liu
中科院分区：
文献类型：
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作者：
Peng Zhengjun;Guowei Yang;Faqiang Li;Zhu Zenghu;Zeyu Liu
基于zLi2SiO3@LiNi0.6Co0.2Mn0.2O2（z = 0，0.03，0.05，0.08）（其中“@”表示“涂覆在表面上”）的阴极材料已经通过合成锂化策略成功地制备。在LiNi0.6Co0.2Mn0.2O2上包覆一层Li 2SiO 3薄膜，有效地提高了其循环性能。与原始材料的81 mAh/g放电容量相比，5mol%Li2SiO3涂覆的LiNi0.6Co0.2Mn0.2O2电极在2.5 V和4.5 V之间在5 C的倍率下表现出31%的高放电容量。LiNi0.6Co0.2Mn0.2O2循环性能提高的原因是Li 2SiO 3包覆和Si 4+掺杂，稳定了结构，抑制了活性物质与电解质的直接接触，增强了锂离子在电极/电解质界面的扩散，防止了活性物质在反复充放电过程中的粉化。
Cathode materials based on zLi2SiO3@LiNi0.6Co0.2Mn0.2O2(z = 0, 0.03, 0.05, 0.08) (where “@” denotes “coated on the surface of”) have been successfully prepared via a syn-lithiation strategy. The cycling performance of LiNi0.6Co0.2Mn0.2O2has been effectively enhanced by coating a Li2SiO3thin film. Compared to the 81 mAh/g discharge capacity of the pristine materials, the 5 mol% Li2SiO3-coated LiNi0.6Co0.2Mn0.2O2electrode exhibits 31% higher discharge capacity between 2.5 V and 4.5 V at a rate of 5 C. The reason for the improved cycling performance of LiNi0.6Co0.2Mn0.2O2is Li2SiO3coating and Si4+doping, which stabilizes the structure, suppresses the direct contact between the active materials and electrolytes, enhances lithium ion diffusion at the electrode/electrolyte interface, and prevents the pulverization of active materials during repeated charging/discharging.