A series of LiNi_0.5-xCu_xMn_0.5O₂ (0 ≤ x ≤ 0.05) samples were synthesized through a combination of co-precipitation (CP) and solid-state reaction. The synthesized cathode materials were systematically investigated by X-ray diffraction (XRD), Rietveld refinement, inductively coupled plasma (ICP) spectroscopy, X-ray photoelectron spectroscopy (XPS), and charge-discharge tests. The structural measurements indicated that Cu²⁺ was successfully doped into the structure of the LiNi_0.5Mn_0.5O₂ material. The results of the electrochemical measurements suggest that the electrochemical performances of LiNi_0.5Mn_0.5O₂ can be obviously improved by Cu -doping, and the best doping amount is 1 mol%. Specifically, the capacity retention of a 1 mol% Cu-doped sample is 18% higher than that of pure LiNi_0.5Mn_0.5O₂ in the range of 2.5~4.6 V at 0.2 C. Most importantly, the cycle stability of LiNi_0.5Mn_0.5O₂ at high currents can also be improved by Cu-doping. We found that Cu-doping can lower the Li/Ni cation mixing, enlarge the migration channels of lithium ions, reduce migration resistance, and retard polarization, and in turn, it can improve the electrochemical properties of LiNi_0.5Mn_0.5O_2.

一系列的LiNi的_{0.5- X}的Cu _X的Mn _0.5 ø ₂（0≤  X  ≤0.05）样品通过共沉淀（CP）和固态反应的组合来合成。通过X射线衍射（XRD），Rietveld精制，电感耦合等离子体（ICP）光谱，X射线光电子能谱（XPS）和充放电测试对合成的阴极材料进行了系统的研究。结构测量表明，Cu ²⁺被成功地掺杂到LiNi _0.5 Mn _0.5 O ₂材料的结构中。电化学测量结果表明LiNi的电化学性能掺杂Cu可以明显改善_0.5 Mn _0.5 O ₂，最佳掺杂量为1 mol％。具体而言，在0.2〜2.5 V的范围内，在0.2 C下2.5 4.6 V范围内，1 mol％的Cu掺杂样品的容量保持率比纯LiNi _0.5 Mn _0.5 O ₂高18％。最重要的是，LiNi _0.5 Mn的循环稳定性高电流下的_0.5 O ₂也可以通过掺杂Cu来改善。我们发现，Cu掺杂可以降低Li / Ni阳离子的混合，增加锂离子的迁移通道，降低迁移电阻，并阻止极化，进而可以改善LiNi _0.5 Mn _0.5的电化学性能。O _2。