Using a co-precipitation approach, we introduce Co into LiNi_0.5Mn_1.5O₄ 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.

中文翻译：

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Co掺杂部位对LiNi 0.5 Mn 1.5 O 4正极材料电化学性能的影响

使用共沉淀方法，将Co引入LiNi _0.5 Mn _1.5 O _4中制备一系列Co掺杂的阴极材料，其中Co代替部分Ni和Mn。然后，我们系统地研究了Co掺杂在这些不同位置的影响。通过X射线衍射，扫描电子显微镜，透射电子显微镜，Brunauer-Emmett-Teller分析，恒电流充放电测试和电化学阻抗谱研究了结构和电化学性能。共掺杂样品经历了轻微的容量损失，但是其循环稳定性和速率性质得到了显着改善。当同时置换Ni和Mn时，经过80次循环后，使用该掺杂材料作为阴极的电池在0.1 C和2.0 C下的容量分别保持在99.7％和96.8％，