In this study, the nickel-manganese binary cathode material was synthesized using a high-temperature solid-state roasting method. The effects of roasting temperature and roasting time on the electrochemical performance of the cathode material was investigated. The research demonstrated that under conditions of 850°C for 12 hours, the synthesized LNMO exhibited an Fd-3m space group structure characterized. The initial discharge-specific capacity reached 135 mAh·g⁻¹ at a rate of 0.2C, while the capacity retention rate was 91.8% after 100 cycles. Following the modification with carbon nanotubes, exhibited an initial discharge capacity of 140 mAh·g⁻¹ at a rate of 0.2C, maintaining a capacity retention rate of 92.9% after 100 cycles. Carbon nanotube modification was implemented to address the poor conductivity and unstable electrochemical performance of LNMO when utilizing acetylene black as a conductive agent. This finding suggests that the unique three-dimensional conductive network formed by carbon nanotube offers superior modification effects compared to acetylene black, while the reduced quantity of conductive agent used also contributes to cost savings.

中文翻译：

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高压LiNi0.5Mn1.5O4正极材料的制备及碳纳米管改性


本研究采用高温固相焙烧法合成了镍锰二元正极材料。研究了焙烧温度和焙烧时间对正极材料电化学性能的影响。研究表明，在 850°C 12 h 的条件下，合成的 LNMO 表现出 Fd-3m 空间群结构特征。在 0.2C 的速率下，初始放电比容量达到 135 mAh·g⁻¹，而 100 次循环后容量保持率为 91.8%。用碳纳米管改性后，在 0.2C 的倍率下表现出 140 mAh·g⁻¹ 的初始放电容量，在 100 次循环后保持 92.9% 的容量保持率。碳纳米管改性旨在解决使用乙炔黑作为导电剂时 LNMO 导电性差和电化学性能不稳定的问题。这一发现表明，与乙炔黑相比，碳纳米管形成的独特三维导电网络具有优异的改性效果，同时导电剂用量的减少也有助于节省成本。