酸蒸汽处理改善富锂锰基正极材料的电化学性能

吕晓霞1, 忽小宇1, 陈婧妍1, 袁宁一1,2, 丁建宁1,2, 刘振1,2*

化工新型材料 ›› 2021, Vol. 49 ›› Issue (3) : 192 -196.

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化工新型材料 ›› 2021, Vol. 49 ›› Issue (3) : 192-196. DOI: 10.19817/j.cnki.issn 1006-3536.2021.03.043
科学研究

酸蒸汽处理改善富锂锰基正极材料的电化学性能

    吕晓霞1, 忽小宇1, 陈婧妍1, 袁宁一1,2, 丁建宁1,2, 刘振1,2*
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Electrochemical performance enhancement of Li-rich Mn-based anode material through acid steam treatment

  • Lv Xiaoxia1, Hu Xiaoyu1, Chen Jingyan1, Yuan Ningyi1,2, Ding Jianning1,2, Liu Zhen1,2
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摘要

采用醋酸蒸汽对共沉淀法制备的0.5Li2MnO3·0.5Li(Ni1/3Co1/3Mn1/3)O2(LLO)三元富锂锰基正极材料进行酸处理,并对酸蒸汽处理前后的材料使用X射线衍射仪、能谱仪(EDS)、扫描电镜(SEM)和电池测试仪进行表征和电化学性能的测试。研究结果表明,酸蒸汽处理过程使得富锂锰基正极材料表面残存的Li2O被清除,同时可在富锂材料颗粒表面形成微量Ni、Co掺杂的尖晶石表面层,抑制了电极与电解质之间的副反应,从而提升材料的电化学性能。酸蒸汽处理24h后的LLO初始放电容量可达到300mAh/g,库伦效率为83%,并且循环200圈之后容量保持率为78%左右。

Abstract

0.5Li2MnO3·0.5Li(Ni1/3Co1/3Mn1/3)O2 (LLO)was synthesized through a coprecipitation method and preconditioned with mild acid steam.The pristine and acid-treated materials were characterized by X-ray diffraction(XRD),energy dispersive spectrometer (EDS),scanning electron microscopy (SEM),and battery tester to study the effects of acid steam treatment on the structure,morphology and electrochemical properties.The results showed that the mild acid treatment removed the surface Li2O,and formed a trace Ni and Co-doped spinel surface layer on the surface of Li-rich material.Therefore,the side reaction between anode and electrolyte could be inhibited,meanwhile the electrochemical properties of materials could be improved.The initial discharge capacity of LLO after acid steam treatment for 24h can reach 300mAh/g,the coulombic efficiency was 83%,and the capacity retention rate after about 200 cycles was about 78%.

关键词

富锂锰基正极材料 / 酸蒸汽处理 / 循环性能

Key words

Li-rich layered oxide anode / acid steam treatment / cycle performance

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酸蒸汽处理改善富锂锰基正极材料的电化学性能[J]. 化工新型材料, 2021, 49(3): 192-196 DOI:10.19817/j.cnki.issn 1006-3536.2021.03.043

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