Facile synthesis of carbon-coated Li3VO4 anode material and its application in full cells
Facile synthesis of carbon-coated Li3VO4 anode material and its application in full cells
复制标题
碳包覆Li3VO4负极材料的简易合成及其在全电池中的应用
DOI：
10.1002/ente.201800186
复制
发表时间：
2018
影响因子：
3.8
通讯作者：
Yongsheng Chen
中科院分区：
文献类型：
--
作者：
Xueting Wang;Bin Qin;Dong Sui;Zhenhe Sun;Ying Zhou;Hongtao Zhang;Yongsheng Chen
Li3VO4是一种很有前途的锂离子电池负极材料，但其电子电导率较低。在这里，我们展示了一种简便的固态方法来合成碳包覆的 Li3VO4（LVO/C），以增强其电子导电性和电化学性能。 LVO/C复合材料比无碳Li3VO4表现出更好的比容量、理想的循环性能和合适的倍率性能。在1 C下循环100 次和500 次循环时，可保持456 mAh/g和400 mAh/g的高可逆容量（第二次循环放电容量保持率分别为92.2%和80%）。与传统阴极相结合，所制造的全电池可以比使用 Li4Ti5O12 阳极的商业电池提供更高的能量密度，并且比使用石墨阳极的全电池表现出更稳定的循环性能。 LiFePO4-LVO/C 全电池具有出色的循环稳定性，容量保持率为 99 %。在1 C下100 循环后的第二次循环。LiNi0.8Co0.1Mn0.1O2-LVO/C全电池的最大能量密度约为300 Wh/kg。
Li3VO4is a promising anode material for lithium‐ion batteries, but suffers from low electronic conductivity. Here we demonstrated a facile solid‐state method to synthesize carbon‐coated Li3VO4(LVO/C) to enhance its electronic conductivity and electrochemical performance. The LVO/C composites exhibit preferable specific capacity, desirable cycle performance and suitable rate performance than the carbon‐free Li3VO4. A high reversible capacity of 456 mAh/g and 400 mAh/g can be maintained up to 100 cycles and 500 cycles at 1 C (92.2 % and 80 % retention of the second cycle of discharge capacity, respectively). Coupled with conventional cathodes, the fabricated full cells can deliver higher energy density than their commercial counterparts using Li4Ti5O12anodes and exhibit much more stable cycle performance than full cells using graphite anodes. The LiFePO4‐LVO/C full cell delivers an excellent cycling stability with capacity retention of 99 %vs. the second cycle after 100 cycles at 1 C. The LiNi0.8Co0.1Mn0.1O2‐LVO/C full cell delivers a maximum energy density of about 300 Wh/kg.