Ammonium Vanadium Bronze as a Potassium‐Ion Battery Cathode with High Rate Capability and Cyclability,Small Methods

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Ammonium Vanadium Bronze as a Potassium‐Ion Battery Cathode with High Rate Capability and Cyclability
Small Methods ( IF 10.7 ) Pub Date : 2018-10-17 , DOI: 10.1002/smtd.201800349
Yang Xu ₁ , Huishuang Dong ₂ , Min Zhou ₁ , Chenglin Zhang ₁ , Yuhan Wu ₁ , Wei Li ₂ , Yulian Dong ₂ , Yong Lei ₁

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K‐ion batteries (KIBs) are a promising alternative to lithium‐ion batteries. Despite the rapid development of KIB anodes, cathodes have not developed to the same extent due to the sluggish kinetics of K‐ion intercalation. Here, ammonium vanadium bronze NH₄V₄O₁₀ (NVO) is proposed as a potential KIB cathode material. The as‐synthesized NVO features a large interlayer spacing of 9.8 Å and self‐assembled flower‐like architecture. The cathode delivers a high capacity of 136 mAh g⁻¹ (50 mA g⁻¹) and a decay rate of 0.02% per cycle over 200 cycles in the range of 1–3.8 V. It retains 94% capacity (80 mAh g⁻¹) after 200 cycles in the range of 2–3.8 V. Moreover, it exhibits fast rate capability by delivering 51 mAh g⁻¹ at a rate as high as 3 A g⁻¹ (2–3.8 V), being 90% of the capacity at 0.1 A g⁻¹. Electrochemical mechanism studies suggest that K‐ion storage in NVO is a topotactic process, where transition between V⁴⁺ and V⁵⁺ occurs. They also show that prevention of deammoniation at a higher voltage toward 4.2 V is critical for the structural stability of NVO. This work may stimulate future exploitation of vanadium oxides in KIBs and more insights into the mechanisms of K‐ion storage.

中文翻译：

铵钒青铜作为钾离子电池阴极，具有高倍率能力和可循环性

K离子电池（KIB）是锂离子电池的有前途的替代品。尽管KIB阳极发展迅速，但由于K离子嵌入的动力学缓慢，因此阴极的发展程度不同。在此，提出了铵钒青铜NH ₄ V ₄ O ₁₀（NVO）作为潜在的KIB阴极材料。合成后的NVO具有9.8Å的较大层间间距和自组装的类似花的建筑。阴极提供的136毫安g的高容量^-1（50毫安克^-1）和每个循环的0.02％在1-3.8 V的范围内的衰减率超过200个循环它保留94％的容量（80毫安克^{- 1个}）在2–3.8 V的范围内经过200个循环之后。此外，它还以高达3 A g ^-1（2–3.8 V）的速率提供51 mAh g ^-1的功率，显示了快速的定速能力，占总功率的90％。在0.1 A g ^-1时的容量。电化学机理研究表明，NVO中的钾离子存储是一个全能过程，在该过程中会发生V ⁴⁺和V ⁵⁺之间的跃迁。他们还表明，防止向4.2 V施加更高电压下的脱氨对于NVO的结构稳定性至关重要。这项工作可能会刺激未来在KIBs中利用钒氧化物，并进一步了解K离子的储存机理。

更新日期：2018-10-17

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