热处理对钼改性 MgMn2O4 正极特性和晶体结构的影响

IF 1.4 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY
N. Kitamura, Ryo Noritake, Chiaki Ishibashi, Y. Idemoto
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引用次数: 0

摘要

镁锰氧化物(MMO)作为镁充电电池的正极材料备受关注,为了改善其电极性能,我们用钼化合物对 MMO 进行了改性,并研究了改性过程中热处理温度(600-800 ℃)对电极性能和晶体结构的影响。将 MMO 浸入含 Mo 离子的水溶液中,然后进行热处理,成功合成了 Mo 改性 MMO。放电/充电循环测试表明,在 700 °C 下热处理的钼改性 MMO 具有最高的放电容量和循环特性。利用同步辐射 X 射线衍射数据进行的晶体结构分析表明,高温热处理虽然增加了镁和锰阳离子的混合量,但却能减缓晶体结构的畸变。晶体结构的变化和钼化合物的表面改性被认为是改善 MMO 正电极性能的因素。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of heat treatment on positive electrode properties and crystal structures of Mo-modified MgMn2O4
To improve electrode properties of MgMn2O4 (MMO), which has attracted attention as a positive electrode material for magnesium rechargeable batteries, we performed modification of MMO with a Mo compound and investigated particularly effects of heat-treatment temperature (600-800 °C) in the modification process on the electrode properties and crystal structures. The Mo-modified MMO were successfully synthesized by immersing MMO in an aqueous solution containing Mo ion, followed by the heat treatment. Discharge/charge cycle tests revealed that Mo-modified MMO heat-treated at 700 °C exhibited the highest discharge capacity and cycle characteristics. Crystal-structure analyses using synchrotron X-ray diffraction data showed that the heat treatment at higher temperature could relax the distortion of the crystal structure although it increased an amount of Mg and Mn cation mixing. The crystal-structure change and surface modification with a Mo compound are considered to be the factors for improved positive-electrode properties of MMO.
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来源期刊
Chemistry Letters
Chemistry Letters 化学-化学综合
CiteScore
3.00
自引率
6.20%
发文量
260
审稿时长
1.2 months
期刊介绍: Chemistry Letters covers the following topics: -Organic Chemistry- Physical Chemistry- Inorganic Chemistry- Analytical Chemistry- Materials Chemistry- Polymer Chemistry- Supramolecular Chemistry- Organometallic Chemistry- Coordination Chemistry- Biomolecular Chemistry- Natural Products and Medicinal Chemistry- Electrochemistry
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