High-performance monoclinic WO3 nanospheres with the novel NH4+diffusion behaviors for aqueous ammonium-ion batteries
High-performance monoclinic WO3 nanospheres with the novel NH4+diffusion behaviors for aqueous ammonium-ion batteries
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DOI：
10.1016/j.cej.2023.141381
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发表时间：
2023-01-11
影响因子：
15.1
通讯作者：
Chen, Han
中科院分区：
文献类型：
--
作者：
Wen, Xiaoyu;Luo, Jinhua;Chen, Han
铵离子水溶液电池因其资源丰富、安全可靠、环境友好等优点而受到广泛关注。通过第一性原理计算和非原位测量，揭示了单斜相WO 3在电化学过程中的三维平衡扩散行为，以及几何氢键与传统线性氢键之间可逆的建立/断裂的新演化过程.具体地，单斜晶系WO 3在0.1 A g-1的电流密度下提供150.6 mAh g-1的高比容量，并且在5.0 A g-1的电流密度下表现出48 mAh g-1的优异倍率性能和500次循环后86.6%容量保持率的优异循环稳定性。以单斜相WO 3为阳极、γ-MnO 2为阴极的铵离子全电池在3.0 A g-1的电流密度下循环5000次后，能量密度达到64.9 Wh kg-1，容量保持率达到95.4%。因此，对NH 4+扩散行为和氢键演化机理的新认识将促进单斜相WO 3在水溶液铵离子电池中的实际应用。
Aqueous ammonium-ion batteries (AAIBs) have attracted tremendous attentions due to their plentiful resources, inherent security and environmental friendliness. From the first-principles calculations and ex-situ measure-ments, monoclinic WO3 revealed the three-dimensional equilibrium diffusion behaviors during the electro-chemical processes, and the novel evolution processes of reversible building/breaking between geometric hydrogen bonds and traditional linear hydrogen bonds. Specifically, monoclinic WO3 delivered a high specific capacity of 150.6 mAh g-1 at the current density of 0.1 A g-1, and exhibited excellent rate capability of 48 mAh g-1 at the current density of 5.0 A g-1 and outstanding cycling stability of 86.6 % capacity retention after 500 cycles. Furthermore, the ammonium-ion full batteries based on the monoclinic WO3 anode and gamma-MnO2 cathode ach-ieved a perfect energy density of 64.9 Wh kg-1 and an extreme ultra-long lifespan with 95.4 % capacity retention after 5000 cycles at the current density of 3.0 A g-1. Thus, the novel insights on NH4+ diffusion behaviors and the evolution mechanisms of hydrogen bonds could promote the development of the practical applications for monoclinic WO3 in aqueous ammonium-ion batteries.