Synthesis of Cu-doped Li2O and its cathode properties for lithium-ion batteries based on oxide/peroxide redox reactions
Synthesis of Cu-doped Li2O and its cathode properties for lithium-ion batteries based on oxide/peroxide redox reactions
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DOI：
10.1016/j.jpowsour.2016.11.050
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发表时间：
2017-02-01
影响因子：
9.2
通讯作者：
Mizuno, Noritaka
中科院分区：
文献类型：
--
作者：
Kobayashi, Hiroaki;Hibino, Mitsuhiro;Mizuno, Noritaka
通过Li2O与CuO之间的机械化学反应合成了掺杂cu的Li2O，证明其可作为锂离子电池的正极材料。x射线衍射和吸收分析表明，在cu掺杂的Li2O中，Cu2+离子位于比Li+离子的8c位点更不对称的48g位点，使周围O2-离子的排列从四面体轻微扭曲为方形平面，而Cu2+离子掺杂在反荧光型Li2O中。掺杂cu的Li2O阴极的充电容量为360 mAh g(-1)，没有不可逆的O-2气体释放反应，其可逆容量为300 mAh g（-1）。铜K-edge XANES光谱和过氧化氢物质的定量分析表明，在充放电过程中，铜离子发生氧化还原、o2p电子空穴的形成/中和以及过氧化氢物质的生成/湮灭。(C) 2016 Elsevier B.V.版权所有
Cu-doped Li2O, synthesized by mechanochemical reactions between Li2O and CuO, is demonstrated as a cathode material for lithium-ion batteries. The X-ray diffraction and absorption analyses suggest that in the Cu-doped Li2O, Cu2+ ions are located at 48g sites less symmetrical than 8c sites for Li+ ions, distorting the arrangement of surrounding O2- ions slightly from tetrahedral to square-planar, while the Cu2+ ions are doped in an antifluorite-type Li2O. The Cu-doped Li2O cathode has a charge capacity of 360 mAh g(-1) without an irreversible O-2 gas evolution reaction and exhibits a reversible capacity of 300 mAh g(-1). Cu K-edge XANES spectroscopy and quantitative analysis of peroxide species reveal that redox of copper ions, formation/neutralization of O 2p electron holes, and generation/annihilation of peroxide species take place during charge/discharge. (C) 2016 Elsevier B.V. All rights reserved.