还原氧化石墨烯原位包覆纳米MnTiO_3颗粒的简易合成及储锂性能研究（英文）  

Facile Synthesis of Reduced Graphene Oxide In-situ Wrapped MnTiO_3 Nanoparticles for Excellent Lithium Storage

作　　者：刘焕龙 赵伟[2] 李睿哲 黄谢意 唐宇峰[2] 李冬梅[1] 黄富强[2,3] LIU Huan-Long;ZHAO Wei;LI Rui-Zhe;HUANG Xie-Yi;TANG Yu-Feng;LI Dong-Mei;HUANG Fu-Qiang(School of Material Science and Engineering,Shanghai University,Shanghai 200444,China;State Key Laboratory of High Performance Ceramics and Superfine Microstructure,Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China;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)

机构地区：[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

出　　处：《无机材料学报》2018年第9期1022-1028,共7页Journal of Inorganic Materials

基　　金：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MnTiO_3纳米颗粒(MnTiO_3@rGO)。合成的MnTiO_3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,MnTiO_3@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,MnTiO_3@rGO展现出了286 mAh?g^(–1)的比容量。此外,得益于MnTiO_3@rGO的多孔结构和柔性的还原氧化石墨烯外层,MnTiO_3@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。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（MnT iO3@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 mA h@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 m Ah@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.

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 

分 类 号：TQ174[化学工程—陶瓷工业]