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Improving the structural stability and reaction kinetic of Na3V2(PO4)3 through tungsten doping towards the ultralong cycle performance and excellent temperature tolerance of sodium ion batteries
Chemical Engineering Science ( IF 4.7 ) Pub Date : 2024-04-27 , DOI: 10.1016/j.ces.2024.120187
Jing Liu , Bo Li , Qiuyue Li , Wen Fu , Mingyu Wang , Zhiying Lin , Fangzheng Jiang , Kaixing Zhu , Linyu Yang , Fangfang Li , Peng Wang

A series of carbon-coated tungsten doping NVP (NaVW(PO)@C, x = 0, 0.05, 0.1, 0.2, 0.3) was synthesized by sol–gel method. Characterization reveals that partial substitution of V by the larger W has beneficial influences on the structure and diffusion kinetics of NVP. Consequently, the optimized NVP-W0.1@C electrode releases a reversible initial capacity of 116 mA h g at 1C, that is quite near to the theoretical value of pure NVP (117 mA h g). Furthermore, it delivers a high reversible capacity of 83.6 mA h g at 50C with marvelous 94.3 % retention over 18,000 cycles. Desirable performances are demonstrated at −20 °C and 45 °C respectively, suggesting its viability in harsh environment. This work shed a light on scalable and feasible routine to regulate SIBs-based cathodes with promising performances.

中文翻译:


通过钨掺杂提高Na3V2(PO4)3的结构稳定性和反应动力学,实现钠离子电池的超长循环性能和优异的耐温性



采用溶胶-凝胶法合成了一系列碳包覆钨掺杂NVP(NaVW(PO)@C, x = 0, 0.05, 0.1, 0.2, 0.3)。表征表明,较大的 W 部分取代 V 对 NVP 的结构和扩散动力学具有有益的影响。因此,优化后的NVP-W0.1@C电极在1C下释放出116 mA h g的可逆初始容量,这非常接近纯NVP的理论值(117 mA h g)。此外,它在 50°C 时具有 83.6 mAh g 的高可逆容量,在 18,000 次循环中具有惊人的 94.3% 保留率。分别在 -20°C 和 45°C 下表现出理想的性能,表明其在恶劣环境中的可行性。这项工作揭示了可扩展且可行的常规方法,用于调节具有良好性能的基于 SIB 的阴极。
更新日期:2024-04-27
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