Li intercalation in an MoSe2 electrocatalyst: In situ observation and modulation of its precisely controllable phase engineering for a high‐performance flexible Li‐S battery
Yunke Wang,
Yige Zhao,
Kangli Liu,
Shaobin Wang,
Neng Li,
Guosheng Shao,
Feng Wang,
Peng Zhang
Affiliations
Yunke Wang
State Center for International Cooperation on Designer Low‐carbon & Environmental Materials (CDLCEM) Zhengzhou University Zhengzhou China
Yige Zhao
State Center for International Cooperation on Designer Low‐carbon & Environmental Materials (CDLCEM) Zhengzhou University Zhengzhou China
Kangli Liu
State Center for International Cooperation on Designer Low‐carbon & Environmental Materials (CDLCEM) Zhengzhou University Zhengzhou China
Shaobin Wang
School of Chemical Engineering and Advanced Materials The University of Adelaide Adelaide South Australia Australia
Neng Li
State Key Laboratory of Silicate Materials for Architecture Wuhan University of Technology Wuhan China
Guosheng Shao
State Center for International Cooperation on Designer Low‐carbon & Environmental Materials (CDLCEM) Zhengzhou University Zhengzhou China
Feng Wang
Beijing Key Laboratory of Electrochemical Process and Technology for Materials Beijing University of Chemical Technology Beijing China
Peng Zhang
State Center for International Cooperation on Designer Low‐carbon & Environmental Materials (CDLCEM) Zhengzhou University Zhengzhou China
Abstract Sophisticated efficient electrocatalysts are essential to rectifying the shuttle effect and realizing the high performance of flexible lithium‐sulfur batteries (LSBs). Phase transformation of MoSe2 from the 2H phase to the 1T phase has been proven to be a significant method to improve the catalytic activity. However, precisely controllable phase engineering of MoSe2 has rarely been reported. Herein, by in situ Li ions intercalation in MoSe2, a precisely controllable phase evolution from 2H‐MoSe2 to 1T‐MoSe2 was realized. More importantly, the definite functional relationship between cut‐off voltage and phase structure was first identified for phase engineering through in situ observation and modulation methods. The sulfur host (CNFs/1T‐MoSe2) presents high charge density, strong polysulfides adsorption, and catalytic kinetics. Moreover, Li‐S cells based on it display capacity retention of 875.3 mAh g−1 after 500 cycles at 1 C and an areal capacity of 8.71 mAh cm−2 even at a high sulfur loading of 8.47 mg cm−2. Furthermore, the flexible pouch cell exhibiting decent performance will endow a promising potential in the wearable energy storage field. This study proposes an effective strategy to precisely control the phase structure of MoSe2, which may provide the reference to fabricate the highly efficient electrocatalysts for LSBs and other energy systems.
