Flexible N doped carbon/bubble-like MoS2 core/sheath framework: Buffering volume expansion for potassium ion batteries

Guoquan Suo; Jiaqi Zhang; Dan Li; Qiyao Yu; Meng He; Lei Feng; Xiaojiang Hou; Yanling Yang; Xiaohui Ye; Li Zhang; Wei Alex Wang

doi:10.1016/j.jcis.2020.01.113

Flexible N doped carbon/bubble-like MoS₂ core/sheath framework: Buffering volume expansion for potassium ion batteries

J Colloid Interface Sci. 2020 Apr 15:566:427-433. doi: 10.1016/j.jcis.2020.01.113. Epub 2020 Jan 30.

Authors

Guoquan Suo¹, Jiaqi Zhang², Dan Li², Qiyao Yu³, Meng He⁴, Lei Feng², Xiaojiang Hou², Yanling Yang², Xiaohui Ye², Li Zhang², Wei Alex Wang⁵

Affiliations

¹ School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China; CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China.
² School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China.
³ Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing 100081, China. Electronic address: qiyaoyu@bit.edu.cn.
⁴ CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China. Electronic address: mhe@nanoctr.cn.
⁵ Beijing Key Laboratory of Bio-inspired Energy Materials and Devices, School of Space and Environment, Beihang University, Beijing 100191, China.

PMID: 32018183
DOI: 10.1016/j.jcis.2020.01.113

Abstract

Suitable anode materials for potassium ion batteries (KIBs) with high capacity, good reversibility and stable cycling performances are still in large demand. Here, flexible N doped carbon/bubble-like MoS₂ core/sheath framework (MoS₂/NCS) is prepared as an anode material for potassium ion batteries. The N doped carbon sponge (NCS) skeleton with good conductivity and high surface area guarantees superior rate capability and high stability of MoS₂/NCS anode. The chemical bonds (CMo) firmly bridge MoS₂ and NCS together, which further ensures MoS₂/NCS stable cycling performance. More importantly, volume expansion is greatly buffered during cycling by this unique structure: the voids between bubble-like MoS₂ sheath and NCS core can effectively buffer volume expansion generated during potassium intercalation/deintercalation; the enlarged interlayer spacing contribute more space to buffer volume change; the ultrathin nanosheets can shorten the charge diffusion distance and buffer volume change. As a consequence, MoS₂/NCS delivers a capacity of 374 mAh g^-1 over 200 cycles at 50 mA g^-1. Even at 1000 mA g^-1, a capacity of 212 mAh g^-1 can still be obtained over 1000 cycles. We believe this MoS₂/NCS structure will highlight the potential of MoS₂ in practical KIBs applications.

Keywords: Buffering volume expansion; Core/sheath framework; Flexible N doped carbon; MoS(2); Potassium ion batteries.