The high nickel ternary cathode materials LiNiCoAlO (NCA) have been widely used in Li-ion batteries due to their high energy density, low cost, and little environmental pollution. However, it suffers from rapid capacity degradation and poor charging rate. In this work, Ti doping NCA cathode materials are prepared by the high-temperature solid-state method. The results show that 0.5%Ti-NCA has a lower cationic mixing degree and better cycling performance. The capacity retention rate of 100 cycles is 98.91% and 96.59% at current densities of 0.5 C and 1.0 C, respectively. The CV and EIS test results show that 0.5%Ti-NCA has lower polarization and higher lithium ion diffusion coefficient D(8.43×10 cm/S) after 100 cycles, while Pure-NCA only has 6.92×10 cm/S, which effectively enhances the electrochemical properties of NCA cathode materials.

中文翻译：

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Ti4+掺杂对LiNi0.815Co0.15Al0.035O2正极材料电化学性能的影响


高镍三元正极材料LiNiCoAlO（NCA）由于具有能量密度高、成本低、环境污染小等优点，在锂离子电池中得到了广泛的应用。然而，它的容量衰减快，充电速率差。本工作采用高温固相法制备了Ti掺杂NCA正极材料。结果表明，0.5%Ti-NCA具有较低的阳离子混合度和较好的循环性能。在0.5C和1.0C电流密度下，100次循环容量保持率分别为98.91%和96.59%。 CV和EIS测试结果表明，0.5%Ti-NCA在100次循环后具有较低的极化率和较高的锂离子扩散系数D（8.43×10 cm/S），而Pure-NCA只有6.92×10 cm/S，有效地降低了锂离子扩散系数。增强NCA正极材料的电化学性能。