化工新型材料

化工新型材料 ›› 2023, Vol. 51 ›› Issue (9) : 118-123. DOI: 10.19817/j.cnki.issn1006-3536.2023.09.022

新材料与新技术

Mn₃O₄/MnO@C复合材料的制备及储锂性能研究

刘渤, 徐桂英, 王坤, 张殿浩, 张文武, 吴松彬, 周卫民

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Preparations and lithium storage characteristics of Mn₃O₄/MnO@C composites

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Received		Published
2022-05-29		2023-09-20
Issue Date	Revised Date
2023-09-25	2022-05-29

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摘要

以煤焦油沥青为碳源,MnSO₄和KMnO₄为锰源,使用一步水热法合成了Mn₃O₄/MnO@C复合材料。通过扫描电子显微镜、X射线衍射仪、X射线光电子能谱和热重分析仪表征方法,揭示了Mn₃O₄/MnO@C复合材料的形貌、晶体结构和化学组分。通过恒流充放电测试、循环伏安测试和交流阻抗测试分析了材料的储锂性能。结果表明:得益于稳定且快速导电网络的构筑,Mn₃O₄/MnO@C复合材料经过300次充放电循环后,放电比容量仍能达到700mAh/g,几乎是商业石墨比容量的2倍。

Abstract

Mn₃O₄/MnO@C composites were synthesized by a one-step hydrothermal method using coal tar pitch as the carbon source and MnSO₄ and KMnO₄ as the manganese sources.The morphologies,crystal structures and chemical components of the Mn₃O₄/MnO@C composites were characterized by scanning electron microscopy,X-ray diffractometer,X-ray photoelectron spectroscopy and thermogravimetric analyzer characterization methods.The Lithium storage capacities of the Mn₃O₄/MnO@C composites were analyzed by constant current charge/discharge,cyclic voltammetry and AC impedance tests.As a result,due to the construction of a stable and fast conducting network,the Mn₃O₄/MnO@C composite could still show a discharge specific capacity of 700mAh/g after 300 charge/discharge cycles,which was almost twice the specific capacity of commercial graphite.

关键词

锰氧化物 / 煤焦油沥青 / 水热法 / 锂离子电池 / 负极材料

Key words

manganese oxide / coal tar pitch / hydrothermal treatment / lithium-ion battery / anode material

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刘渤, 徐桂英, 王坤, 张殿浩, 张文武, 吴松彬, 周卫民. Mn₃O₄/MnO@C复合材料的制备及储锂性能研究[J]. 化工新型材料, 2023, 51(9): 118-123 DOI:10.19817/j.cnki.issn1006-3536.2023.09.022

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