Advanced Li-Rich Cathode Collaborated with Graphite/Silicon Anode for High Performance Li-Ion Batteries in Half and Full Cells

详细信息    查看全文

• 作者：Yanling Huang^a ; ^b ; Xianhua Hou^a ; ^b ; ^{houxh@scnu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Xiaoying Fan^a ; ^b ; Shaomeng Ma^a ; ^b ; Shejun Hu^a ; ^b ; ^{husj@scnu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Kwok-ho Lam^c
• 关键词：Lithium-ion batteries ; Cathode material ; Li1.2Mn0.534Ni0.133Co0.133O2 ; Full cells
• 刊名：Electrochimica Acta
• 出版年：2015
• 出版时间：10 November 2015
• 年：2015
• 卷：182
• 期：Complete
• 页码：1175-1187
• 全文大小：5448 K

文摘

A high performance surface modified Li_1.2Mn_0.534Ni_0.133Co_0.133O₂ cathode with graphene and CNTs (GNL-modified LMNCO) has been synthesized via a simple ultrasonic dispersion approach. Its morphology and electrochemical performance are investigated thoroughly in this work. Typically, the GNL-modified LMNCO demonstrates an initial discharge capacity of 285.8 mAh g⁻¹, showing initial coulombic efficiency of 83.3%. In addition, impressive discharge capacity of 162.3 and 123.5 mAh g⁻¹ are obtained at 5 and 10 C, respectively. More satisfactorily, it reveals high capacity retention of 217.9 mAh g⁻¹ even after the 180th cycle. The extraordinary electrochemical performance of the GNL-modified LMNCO can be ascribed to the unique conducting network of graphene and CNTs coating on the particles, which greatly improves the conductivity of the electrode and enhances the diffusion coefficient of the Li⁺. Most significantly, a high-voltage and high-power electrochemical energy storage devices of lithium-ion battery (LIB) full cell has been simultaneously assembled with the GNL-modified LMNCO as cathode and silicon/graphite/amorphous carbon (Si/C) composite as anode, whose properties outclass many other systems of LIB full cells. Therefore, the acquaintance of the compatibility of the Li-rich cathode and Si/C composite anode for high-voltage and high-energy LIB full cells should attract more research efforts in the future.