无机材料学报 ›› 2018, Vol. 33 ›› Issue (9): 1022-1028.DOI: 10.15541/jim20180143 CSTR: 32189.14.10.15541/jim20180143

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还原氧化石墨烯原位包覆纳米MnTiO3颗粒的简易合成及储锂性能研究

刘焕龙1, 2, 赵伟2, 李睿哲2, 黄谢意2, 唐宇峰2, 李冬梅1, 黄富强2, 3   

  1. 1. 上海大学 材料科学与工程学院, 上海 200444;
    2.中国科学院 上海硅酸盐研究所, 高性能陶瓷和超微结构国家重点实验室, 上海 200050;
    3. 北京大学 化学与分子工程学院, 北京分子科学国家实验室, 稀土材料化学及应用国家重点实验室, 北京 100871
  • 收稿日期:2018-04-03 修回日期:2018-05-01 出版日期:2018-09-20 网络出版日期:2018-08-14
  • 作者简介:刘焕龙. E-mail: huanlongliu@outlook.com

Facile Synthesis of Reduced Graphene Oxide In-situ Wrapped MnTiO3 Nanoparticles for Excellent Lithium Storage

LIU Huan-Long1, 2, ZHAO Wei2, LI Rui-Zhe2, HUANG Xie-Yi2, TANG Yu-Feng2, LI Dong-Mei1, HUANG Fu-Qiang2, 3   

  1. 1. School of Material Science and Engineering, Shanghai University, Shanghai 200444, China;
    2. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;
    3. Beijing National Laboratory for Molecular Sciences and State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
  • Received:2018-04-03 Revised:2018-05-01 Published:2018-09-20 Online:2018-08-14
  • About author:LIU Huan-Long (1990-), male, candidate of Master degree. E-mail: huanlongliu@outlook.com
  • Supported by:
    National Key Research and Development Program (2016YFB0901600);Science and Technology Commission of Shanghai (16ZR1440500, 16JC1401700);National Science Foundation of China (51672301);Key Research Program of Chinese Academy of Sciences (QYZDJ-SSW-JSC013, KGZD-EW-T06);Youth Innovation Promotion Association CAS

摘要:

对于高能量密度的锂离子电池而言, 研究稳定、高容量负极材料的需求十分迫切。基于此, 本工作设计了一种简单有效的溶胶-凝胶法, 来合成高性能的被还原石墨烯氧化物原位包覆的MnTiO3纳米颗粒(MnTiO3@rGO)。合成的MnTiO3纳米粒子分散均匀, 被少层的石墨烯包裹。由于还原氧化石墨烯的高电导率, MnTiO3@rGO作为锂离子电池负极表现出优异的倍率性能, 在5.0 A·g-1的高电流密度时, MnTiO3@rGO展现出了286 mAh·g-1的比容量。此外, 得益于MnTiO3@rGO的多孔结构和柔性的还原氧化石墨烯外层, MnTiO3@rGO负极具有显著的长期循环稳定性。在500个循环后, 比容量仍保持在441 mAh·g-1, 仅损失了8.4%。结果表明, 该方法对提高金属氧化物负极的导电性和循环稳定性具有较高的应用价值。

 

关键词: 原位包覆, 还原氧化石墨烯, MnTiO3纳米颗粒, 锂离子电池负极

Abstract:

The stable high-capacity anode has been an urgent demand for high energy density lithium-ion batteries (LIBs). Herein, a simple and effective strategy to synthesize high-performance reduced graphene oxide (rGO) in-situ wrapped MnTiO3 nanoparticles (MnTiO3@rGO) by Sol-Gel method is designed. The MnTiO3 nanoparticles are uniformly dispersed and wrapped by few-layer graphene. Due to high conductivity of rGO, MnTiO3@rGO nanoparticles show excellent rate performance, with a specific capacity of 286 mAh·g-1 being displayed at the higher rate of 5.0 A·g-1. Moreover, benefited from porous structure and flexible rGO shell, the MnTiO3@rGO anode delivers a remarkable long-term cycling stability. The specific capacity maintains 441 mAh·g-1 after 500 cycles at 0.5 A·g-1, only losing 8.4%. Therefore, the results demonstrate that the facile synthetic strategy is highly desirable for improving the conductivity and stability of metal oxide anodes.

Key words: in-situ wrapped, reduced oxide graphene, MnTiO3 nanoparticles, lithium-ion batteries anode

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