Page 152 - 《精细化工》2023年第3期
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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。
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