DataVXACS Applied Energy MaterialsPaper
journal article·2018-11-26

Carbon Nanotube-Connected Yolk–Shell Carbon Nanopolyhedras with Cobalt and Nitrogen Doping as Sulfur Immobilizers for High-Performance Lithium–Sulfur Batteries

Ruiqing Liu, Qi Kang, Wenhui Liu, Zhiwei Liu, Yuejiao Liu, Yizhou Wang, Jianyu Chen, Benjamin Hultman, Xiujing Lin, Yi Li, Pan Li, Zhendong Huang, Xiaomiao Feng, Gang Wu, Leshu Yu, Yanwen Ma

ACS Applied Energy Materials· Volume 1· Issue 11
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Source abstract

Abstract

The lithium sulfur battery is regarded as a promising energy solution because of its high energy density. However, the insulating nature and large volumetric expansion of sulfur and the high solubility of polysulfides restrict their practical applications. Here carbon nanotube (CNT)-induced yolk–shell carbon nanopolyhedra, with Co–N-doping, is used as host material for sulfur. The CNTs are used to create a conductive network which interweaves each carbon polyhedron and induces the formation of a yolk–shell structure during the sulfur melt-diffusion process due to the “perforation effect”. The CNT-connected Co–N-doped carbon nanopolyhedra containing sulfur yolk–shell structure (S@Co–N–C/CNTs-0.5) can achieve a capacity of 712.2 mAh g–1 at 1675 (1 C) mA g–1 after 300 cycles and 511.8 mAh g–1 at 3350 (2 C) mA g–1. The outstanding performance is attributed to the new paradigm, S@Co–N–C/CNTs-0.5 yolk–shell structure, which creates a conductive network allowing for improved electron transport and convenient electrolyte infiltration, as well as enhanced reaction kinetics for the electrochemical process synchronously. The significant internal void space of yolk–shell structure effectively accommodates the volume expansion of sulfur. Simultaneously, Co–N-doping in yolk–shell structure carbon polyhedra can synergistically trap polysulfides due to the strong chemical adsorption.
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Research context

Energy storageNanomaterials

OpenAlex topics: Advanced Battery Materials and Technologies · Advancements in Battery Materials · Thermal Expansion and Ionic Conductivity

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors, Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts and Telecommunications, 9 Wenyuan Road, Nanjing 210023, China

Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, New York 14260, United States

School of Chemistry and Environmental Science, Key Laboratory of Polymer Preparation and Processing, Shangrao Normal University, Shangrao, Jiangxi 334001, China

Funding

University at Buffalo · Natural Science Foundation of Jiangsu Province · Government of Jiangsu Province · Nanjing University of Posts and Telecommunications · National Natural Science Foundation of China · Division of Chemical, Bioengineering, Environmental, and Transport Systems · Synergetic Innovation Center for Organic Electronics and Information Displays · Priority Academic Program Development of Jiangsu Higher Education Institutions · Jiangxi Province · Jiangsu National Synergetic Innovation Center for Advanced Materials

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