Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 7, Issue 13, Pages 7516-7525Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ta00744j
Keywords
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Funding
- National Key Research and Development Program [2017YFB0702001]
- National Natural Science Foundation-Outstanding Youth Foundation [51771162]
- Yanshan University Graduate Student Innovative Funding Program [314-023000203]
- Heibei Province Youth Top-notch Talent Program
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Increasing environmental problems and energy challenges have created an urgent demand for the development of green and efficient energy-storage systems. The search for new materials that could improve the performance of Li-ion batteries (LIBs) is one of today's most challenging tasks. Herein, a stable symmetric LIB based on the bipolar material-MXene/Na0.55Mn1.4Ti0.6O4 was developed. This bipolar hybrid material showed a typical MXene-type layered structure with high conductivity, containing two electrochemically active redox couples, namely, Mn4+/Mn3+ (3.06 V) and Mn2+/Mn (0.25 V). This MXene/Na0.55Mn2O4-based symmetric full cell exhibited the highest energy density of 393.4 W h kg(-1) among all symmetric full cells reported so far, wherein it is bestowed with a high average voltage of 2.81 V and a reversible capacity of 140 mA h g(-1) at a current density of 100 mA g(-1). In addition, it offers a capacity retention of 79.4% after 200 cycles at a current density of 500 mA g(-1). This symmetric lithium ion full battery will stimulate further research on new LIBs using the same active materials with improved safety, lower costs and a long life-span.
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