A three-dimensional core-shell nanostructured composite of polypyrrole wrapped MnO₂/reduced graphene oxide/carbon nanotube for high performance lithium ion batteries

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• 作者：Yong Li^a ; ¹ ; Daixin Ye^b ; ¹ ; ^{daixin@chalmers.se} ; Wen Liu^a ; Bin Shi^a ; Rui Guo^a ; Haijuan Pei^a ; Jingying Xie^a ; ^{jyxie@mail.sim.ac.cn}
• 关键词：Polypyrrole ; MnO2 ; Reduced grapheneoxide ; Carbon nanotubes ; Lithium ion batteries
• 刊名：Journal of Colloid and Interface Science
• 出版年：2017
• 出版时间：1 May 2017
• 年：2017
• 卷：493
• 期：Complete
• 页码：241-248
• 全文大小：2456 K
• 卷排序：493

文摘

Manganese oxides are promising anode materials for their high-energy density. However, they suffer from poor rate capability and fast capacity fading. Herein, we construct a three-dimensional (3D) core-shell structured polypyrrole (PPy)/MnO2-reduced graphene oxide (rGO)-carbon nanotubes (CNTs) composite via a facile two-step method. In the structure, the CNTs can facilitate fast electron conduction and keep structural integrity. The flexible and conductive rGO nanosheets work as both a reactive material and a carrier for MnO2 in-situ growth. The MnO2 nanosheets well distributed on the rGO/CNTs scaffold favor the energy storage by way of fast Li+ insertion and extraction. PPy nanoparticles (∼10 nm) well wrapped on the MnO2 nanosheets not only enable the interfacial stabilization, but also provide a buffer layer to accommodate the volume expansion. As a result, the as-prepared PPy/MnO2-rGO-CNTs composite exhibits high specific capacity, excellent cycling stability and good rate capability. A reversible specific capacity of 1748.1 mA h g−1 is achieved at the current density of 100 mA g−1 after 200 cycles. Even at a high current density of 1000 mA g−1, the composite still exhibits 941.1 mA h g−1 after 1200 cycles. The design strategy of the composite can be extended to other high-capacity metal oxide material.