首页|不同合成方法制备NaNi0.5Mn0.5O2及其电化学性能研究

不同合成方法制备NaNi0.5Mn0.5O2及其电化学性能研究

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分别采用固相法、共沉淀法和溶胶-凝胶法合成了钠离子电池正极材料NaNi0.5Mn0.5O2,探究了合成方法对正极材料晶体结构、微观形貌以及电化学性能的影响.结果表明:3种方法合成的材料均表现为O3型结构;不同方法制备的材料形貌各不相同,其中固相法合成的材料颗粒呈现出特殊的层状结构,有利于钠离子的脱嵌;固相法、共沉淀法和溶胶凝胶法合成的材料在0.1C下的首次放电比容量分别为96.1 mAh/g、92.8 mAh/g和92.3 mAh/g,0.5C下循环100次后的容量保持率分别为64.3％、46.5％和36.5％.固相法是适宜的制备方法.
Electrochemiacal Performance of NaNi0.5Mn0.5O2 Material Synthesized by Different Methods
A cathode material(NaNi0.5Mn0.5O2)for sodium-ion batteries was synthesized by adopting solid-state,co-precipitation and sol-gel methods,and the effects of synthesis methods on crystal structure,microscopic morphology and electrochemical performance of the cathode material were also explored.The results show that the materials synthesized respectively by those three methods all have O3-type structure,but exhibit different morphology.The cathode material synthesized by solid-state method has a special layered structure,which is conducive to sodium ion de-intercalation.The cathode materials synthesized by solid-state,co-precipitation and sol-gel methods,respectively,deliver an initial specific discharge capacity of 96.1 mAh/g,92.8 mAh/g and 92.3 mAh/g at 0.1C,with retention rate of 64.3％,46.5％and 36.5％respectively after 100 cycles at 0.5C.It is concluded that the solid-state synthesis is an appropriate method.

sodium-ion batterycathode materialNaNi0.5Mn0.5O2solid-state synthesisco-precipitation synthesissol-gel synthesis

史世和、白世伟、杨波、吴千惠、陈庆荣、廖芝建、钟胜奎、刘洁群

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海南热带海洋学院海洋科学技术学院,海南三亚 572022

崖州湾创新研究院,海南三亚 572022

钠离子电池 正极材料 NaNi0.5Mn0.5O2 固相法 共沉淀法 溶胶-凝胶法

国家自然科学基金国家自然科学基金海南省自然科学基金海南省自然科学基金海南省自然科学基金海南省自然科学基金海南省自然科学基金海南热带海洋学院引进人才科研启动资助项目

5216402952074099821MS0782221MS048221RC585SQ2022GXJS0018221RC1072RHDRC202002

2024

10.3969/j.issn.0253-6099.2024.04.003

矿冶工程
长沙矿冶研究院有限责任公司 中国金属学会

矿冶工程

CSTPCD北大核心
影响因子：1.137
ISSN：0253-6099
年,卷(期)：2024.44(4)