K2Fe3(SO4)(3)(OH)(2)(H2O)(2): A new high-performance hydroxysulfate cathode material for alkali metal ion batteries
K2Fe3(SO4)(3)(OH)(2)(H2O)(2): A new high-performance hydroxysulfate cathode material for alkali metal ion batteries
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K2Fe3(SO4)(3)(OH)(2)(H2O)(2)：一种新型高性能碱金属离子电池羟基硫酸盐正极材料
DOI：
10.1016/j.jpowsour.2020.227835
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发表时间：
2020
影响因子：
9.2
通讯作者：
Zhang Huamin
中科院分区：
文献类型：
--
作者：
Wang Fuxiang;Liu Shanshan;Jiang Qike;Feng Kai;Yang Xin;Li Xingcun;Zhang Hongzhang;Xia Mingjun;Zhang Huamin
聚阴离子电极材料，特别是硫酸盐电极材料，具有安全、稳定、氧化还原电位可调等优点，引起了人们的广泛关注。探索碱金属离子（Li、Na、K）电池的通用正极材料，对于了解离子尺寸对材料电化学性能的影响具有重要意义。本文报道了一种新的硫酸亚铁钾（K2 Fe 3（SO 4）3（OH）2（H2O）2），它是一种很有前途的可充碱离子电池正极材料。无论采用Li离子还是大半径Na离子和K离子，该材料都表现出相当的容量（~100 mA h·g−1），沿着具有优异的速率行为（10 C下70 mA h·g− 1）和长寿命（1C下100次循环后~100%）。此外，K2 Fe 3（SO 4）3（OH）2（H2O）2阴极在三种碱金属离子存在下表现出不同的电化学性能，这有助于理解反应机理的基本方面。本工作不仅丰富了硫酸盐系列化合物的晶体化学，而且为其他钾基聚阴离子化合物作为锂离子和钠离子电池正极材料的设计提供了新的思路。
With advantages of safety benefits, high stability and tunable redox potentials, polyanionic electrode materials, especially sulfates draw lots of interests. Exploring general cathodes for alkali ion (Li, Na and K) battery is of great importance to understand the effect of ion size on materials’ electrochemical performance. Here, we report on a new K2Fe3(SO4)3(OH)2(H2O)2sulfate as a promising cathode material for rechargeable alkali-ion batteries. Regardless of employing Li ions or large radius Na ions and K ions, the material manifests comparable capacities (~100 mA h•g−1) along with excellent rate behaviors (70 mA h•g−1at 10C) and long lifetimes (~100% after 100 cycles at 1C). In addition, K2Fe3(SO4)3(OH)2(H2O)2cathode delivers different electrochemical performances with three alkali ions, which is beneficial to understand the fundamental aspects of the reaction mechanisms. This work not only enriches the crystal chemistry of sulfate family, but also proposes a new design strategy to other K-based polyanionic compounds as cathode materials for Li ions and Na ions batteries.