Page 152 - 《精细化工》2023年第3期
P. 152
第 40 卷第 3 期 精 细 化 工 Vol.40, No.3
20 23 年 3 月 FINE CHEMICALS Mar. 2023
电子化学品
Mn O 微观结构对固相合成类单晶锰酸锂的影响
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尹金佩 ,王 洋 ,朱林剑 ,刘泽萍 ,范广新 1,2*
(1. 河南理工大学 材料科学与工程学院,河南 焦作 454003;2. 焦作伴侣纳米材料工程有限公司,
河南 焦作 454000)
摘要:探究了 Mn 3 O 4 的微观结构对高温固相法制备类单晶锰酸锂(LiMn 2 O 4 )的影响。结果表明,前驱体对 LiMn 2 O 4
的结构和形貌有决定性的影响。粒度小、比表面积大的类球形 Mn 3 O 4 更易制得类单晶锰酸锂,其颗粒团聚致密、
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表面光滑,且晶胞参数小、能量密度大、Li 浓度高。类单晶锰酸锂的综合电化学性能和热稳定性远高于非类单
晶材料,在 0.2 C 倍率下首次放电比容量和库仑效率分别高达 112.50 mA·h/g、96.5%,8 C 倍率下放电比容量仍
有 102.11 mA·h/g,200 次循环后容量保持率为 90.1%。类单晶锰酸锂优异的性能归因于其具有稳定的晶体结构
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和外露表面、较高的 Li 浓度,在电化学反应中结构稳定、锂离子迁移速率快、电极极化和电荷转移阻抗小。
关键词:前驱体;类单晶锰酸锂;锂离子浓度;微观结构;热稳定性;电子化学品
中图分类号:TQ152;TM911 文献标识码:A 文章编号:1003-5214 (2023) 03-0608-06
Effect of Mn 3O 4 microstructure on solid-phase synthesis of
mono-like lithium manganate
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YIN Jinpei , WANG Yang , ZHU Linjian , LIU Zeping , FAN Guangxin 1,2*
(1. School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, Henan, China; 2.
Jiaozuo Companion Nano Materials Engineering Co., Ltd., Jiaozuo 454000, Henan, China)
Abstract: The influence of Mn 3O 4 microstructure on the synthesis of mono-like lithium
manganate(LiMn 2O 4) by high temperature solid state reaction was investigated, and the results showed that
the precursors had a great influence on the structure and morphology of LiMn 2O 4. The spheroid Mn 3O 4 with
small particle size and large specific surface area was more likely to produce mono-like lithium manganate,
which had dense particle agglomeration, smooth surface, small cell parameters, high density and Li-ion
concentration. The mono-like lithium manganate exhibited first discharge specific capacity of 112.50
mA·h/g and coulomb efficiency at 0.2 C rate of 96.5%, with the discharge specific capacity remained as
high as 102.11 mA·h/g at 8 C rate and the capacity retention of 90.1% even after 200 recycles, indicating
much higher comprehensive electrochemical performance and thermal stability in comparison to non-like
single crystal material. The excellent performance of mono-like lithium manganate was attributed to its
more stable crystal structure, larger exposed surface, and higher Li-ion concentration. Moreover, the
mono-like lithium manganate displayed stable structure, fast lithium ion migration rate, small electrode
polarization and charge transfer impedance during the electrochemical reaction process.
Key words: precursors; mono-like lithium manganate; Li-ion concentration; microstructure; thermal
stability; electronic chemicals
随着便携式电子设备、电动工具和动力汽车等 作为正极材料的尖晶石锰酸锂(LiMn 2 O 4 )由于高比
领域的快速发展,锂离子电池的应用越来越普遍。 能量、安全性好、环境友好及成本低等优点得到广
收稿日期:2022-08-20; 定用日期:2022-10-24; DOI: 10.13550/j.jxhg.20220775
基金项目:国家自然科学基金重点项目(U1804135,51671080);河南省科技创新人才计划(194200510019)
作者简介:尹金佩(1998—),女,硕士生,E-mail:18339183103@163.com。联系人:范广新(1981—),男,副教授,E-mail:
fangx@hpu.edu.cn。