Reversible AlCl4-/Al(2)Cl(7)(-)conversion in a hybrid Na-Al battery
Reversible AlCl4-/Al(2)Cl(7)(-)conversion in a hybrid Na-Al battery
复制标题
混合Na-Al电池中的可逆AlCl4-/Al(2)Cl(7)(-)转换
DOI：
10.1016/j.jpowsour.2020.227843
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发表时间：
2020
影响因子：
9.2
通讯作者：
Wen Zhaoyin
中科院分区：
文献类型：
--
作者：
Wang Jingyi;Hu Yingying;Li Yanpei;Gao Xingpeng;Wu Xiangwei;Wen Zhaoyin
由于钠离子的半径比锂离子的半径大，Na+离子在阴极中的传输和电化学反应的动力学更缓慢。这导致钠离子电池的差的倍率性能和差的长期循环稳定性。本文中，设计了与由1-乙基-3-甲基咪唑氯化物（EMImCl）和铝盐（AlCl 3）组成的离子液体阴极电解液配位的Al阴极，以与Na金属阳极配对，以生产高性能可再充电钠电池。所获得的电池达到2.1 V的高电压，并显示出优异的长期循环稳定性，在60 °C下以100 mA g− 1进行1000次循环后，容量保持率为92%。此外，铝阴极上的电化学过程取决于AlCl 4 −-Al 2Cl 7 −氧化还原电对的转换机制。这种Na-Al混合电池为解决负担得起且可靠的大规模储能提供了一个想法。
Owing to the larger radius of sodium ion as compared to that of lithium ion, the kinetics of transport and electrochemical reactions of Na+ions in the cathode is more sluggish. This results in poor rate performance and inferior long-term cycling stability of sodium-ion batteries. Herein, an Al cathode coordinated with ionic liquid catholyte consisting of 1-ethyl-3-methylimidazolium chloride (EMImCl) and aluminum trichloride (AlCl3) is designed to pair with Na metal anode to produce a high-performance rechargeable sodium battery. The obtained batteries reach a high voltage of 2.1 V and show excellent long-term cycling stability with 92% capacity retention over 1000 cycles at 100 mA g−1at 60 °C. Furthermore, the electrochemical processes on Al cathode are revealed dependent on the conversion mechanism of AlCl4−-Al2Cl7−redox couple. This Na–Al hybrid battery offers an idea for addressing affordable and reliable large-scale energy storage.