Effects of Co doping sites on the electrochemical performance of LiNi0.5Mn1.5O4 as a cathode material

作者：Xu, Dongwei; Yang, Fan; Liu, Zushan; Zeng, Xiaoyuan; Deng, Yonghong; Zheng, Yuying^*; Lou, Hongming^*; Liao, Shijun^*

来源：IONICS, 2020, 26(8): 3777-3783.

DOI：10.1007/s11581-019-03284-y

• Cobalt doping
• Lithium nickel manganate
• Cathode
• Lithium-ion battery

Using a co-precipitation approach, we introduce Co into LiNi0.5Mn1.5O4 to prepare a series of Co-doped cathode materials in which the Co substitutes partial Ni and Mn. We then systematically study the effects of Co doping at these various sites. The structural and electrochemical properties are investigated by means of X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Brunauer-Emmett-Teller analysis, galvanostatic charge-discharge tests, and electrochemical impedance spectroscopy. The Co-doped samples experience a slight capacity loss, but their cycling stability and rate properties are significantly improved. When Ni and Mn are simultaneously substituted, the capacities at 0.1 C and 2.0 C of a battery using this doped material as the cathode stay at 99.7% and 96.8%, respectively, after 80 cycles, which is much better than the results for a battery with undoped material as the cathode.

• 单位
  广东工业大学