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Bimetal-Substituted Polyanion Cathode for Sodium-Ion Batteries: Less Vanadium and Boosted Low-Temperature Kinetics
Small Structures ( IF 13.9 ) Pub Date : 2024-01-16 , DOI: 10.1002/sstr.202300369 Shitan Xu 1 , Wensun Zhu 1 , Yang Yang 1 , Yu Yao 2 , Ghulam Ali 3 , Xianghua Zhang 4 , Xianhong Rui 1 , Yan Yu 2
Small Structures ( IF 13.9 ) Pub Date : 2024-01-16 , DOI: 10.1002/sstr.202300369 Shitan Xu 1 , Wensun Zhu 1 , Yang Yang 1 , Yu Yao 2 , Ghulam Ali 3 , Xianghua Zhang 4 , Xianhong Rui 1 , Yan Yu 2
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Sodium-ion batteries (SIBs) have emerged as an attractive alternative for large-scale energy storage due to their low cost and high safety. The selection of cathode materials, which determine SIB performance, becomes a crucial aspect. Vanadium-based phosphates are known for their multielectron transfer properties and stable structure, but their intrinsic electronic conductivity is limited. In this regard, bimetallic substitution is an excellent modification method for improving the conductivity property. Herein, a novel Na4VMn0.7Ni0.3(PO4)3@C (NVMNP@C) cathode with less vanadium is designed for SIBs, which exhibits outstanding electrochemical performance at 25 °C, delivering rate capacity of 67 mA h g−1 at 3 A g−1, and long-term cyclability of remaining 74.6% after 4800 cycles at 2 A g−1. Furthermore, excellent low-temperature adaptability (82 mA h g−1 at 20 mA g−1, 60 mA h g−1 at 400 mA g−1, and 90.4% capacity retention after 230 cycles at 100 mA g−1) at −40 °C is also achieved. This unique work has broken a feasible pathway for high-performance SIB cathode at low temperature.
中文翻译：
用于钠离子电池的双金属取代聚阴离子阴极：更少的钒和增强的低温动力学
钠离子电池（SIB）因其低成本和高安全性而成为大规模储能的有吸引力的替代品。正极材料的选择决定了SIB的性能，成为一个至关重要的方面。钒基磷酸盐以其多电子转移特性和稳定的结构而闻名，但其固有的电子传导性有限。就此而言，双金属取代是一种改善导电性能的优良改性方法。本文设计了一种用于SIBs的新型Na 4 VMn 0.7 Ni 0.3 (PO 4 ) 3 @C (NVMNP@C)正极，其含钒量较少，在25 °C下表现出出色的电化学性能，倍率容量为67 mA h g −1在3 A g -1下，在2 A g -1下循环4800次后，长期循环性能仍保持在74.6% 。此外，在-40℃下具有出色的低温适应性（ 20 mA g -1下为82 mA h g -1，400 mA g -1下为 60 mA h g -1 ，100 mA g -1下循环 230 次后容量保持率为 90.4% ）也达到了°C。这项独特的工作为低温下高性能SIB阴极开辟了一条可行途径。
更新日期：2024-01-16
中文翻译：
用于钠离子电池的双金属取代聚阴离子阴极：更少的钒和增强的低温动力学
钠离子电池（SIB）因其低成本和高安全性而成为大规模储能的有吸引力的替代品。正极材料的选择决定了SIB的性能，成为一个至关重要的方面。钒基磷酸盐以其多电子转移特性和稳定的结构而闻名，但其固有的电子传导性有限。就此而言，双金属取代是一种改善导电性能的优良改性方法。本文设计了一种用于SIBs的新型Na 4 VMn 0.7 Ni 0.3 (PO 4 ) 3 @C (NVMNP@C)正极，其含钒量较少，在25 °C下表现出出色的电化学性能，倍率容量为67 mA h g −1在3 A g -1下，在2 A g -1下循环4800次后，长期循环性能仍保持在74.6% 。此外，在-40℃下具有出色的低温适应性（ 20 mA g -1下为82 mA h g -1，400 mA g -1下为 60 mA h g -1 ，100 mA g -1下循环 230 次后容量保持率为 90.4% ）也达到了°C。这项独特的工作为低温下高性能SIB阴极开辟了一条可行途径。
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