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Rational design of Mns nanoparticles anchored on n,s-codoped carbon matrix as anode for lithium-ion batteries

Progress in natural science:Materials International 2021年第5期31卷 649-655页

作者： Weiqin Li Mengyuan Yue Huinan Guo Zhaoxia Yuan Yafei Liu Kai Chen Juming Gu Yijing Wang Key Laboratory of Advanced Energy Materials Chemistry Ministry of Education Renewable Energy Conversion and Storage Center College of Chemistry Nankai University Quick Gem Optoelectronic s and T Co. Ltd.

The manganese sulfide(Mns) has attracted more attention as anode material on energy storage and conversion field, owing to its high theoretical capacity(616 mA h g-1) and good electrochemical activity. However, low electronic conductivity and large volume expansion during charge-discharge processes have limited its further application. In order to address above mentioned problems, the composites, Mns nanoparticles embedded in n,scodoped porous carbon skeleton(named as Mns/n,s–C composites), herein have been prepared successfully using metal organic framework(Mn-nTA) as template. The porous carbon skeleton not only can enhance electrode conductivity, but also relieve volume expansion during charge-discharge processes. Thus, the rational design towards electrode architectures has endowed Mns/n,s–C nanocomposites with superior electrochemical performance, which delivers the specific capacities of 676.7 mA h g-1at the current density of 100 mA g-1.

关键词： n,s-codoped Mns nanocomposites Rods-like Lithium ion batteries

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Highly Reversible Li–se Batteries with Ultra-Lightweight n,s-codoped Graphene Blocking Layer

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nano-Micro Letters 2018年第4期10卷 42-51页

作者： Xingxing Gu Lingbao Xin Yang Li Fan Dong Min Fu Yanglong Hou Chongqing Key Laboratory of Catalysis and new Environmental Materials College of Environment and Resources Chongqing Technology and Business University school of Chemical Engineering Shandong University of Technology College of Arts Chongqing Technology and Business University Beijing Key Laboratory for Magnetoelectric Materials and Devices (BKLMMD) BIC-ESAT Department of Materials Science and Engineering College of Engineering Peking University

The desire for practical utilization of rechargeable lithium batteries with high energy density has motivated attempts to develop new electrode materials and battery systems. Here, without additional binders we present a simple vacuum filtration method to synthesize nitrogen and sulfur codoped graphene(n,s-G) blocking layer, which is ultra-lightweight, conductive, and free standing. When the n,s-G membrane was inserted between the catholyte and separator, the lithium–selenium(Li–se)batteries exhibited a high reversible discharge capacity of 330.7 mAh g^(-1) at 1 C(1 C = 675 mA g^(-1)) after 500 cycles and high rate performance(over 310 mAh g^(-1) at 4 C) even at an active material loading as high as ～5 mg cm^(-2). This excellent performance can be ascribed to homogenous dispersion of the liquid active material in the electrode, good Li^+-ion conductivity, fast electronic transport in the conductive graphene framework, andstrong chemical confinement of polyselenides by nitrogen and sulfur atoms. More importantly, it is a promising strategy for enhancing the energy density of Li–se batteries by using the catholyte with a lightweight heteroatom doping carbon matrix.

关键词： Li–se batteries n,s-codoped Graphene Ultra-lightweight Free-standing Vacuum filtration

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