Rational design of MXene@TiO(2)nanoarray enabling dual lithium polysulfide chemisorption towards high-performance lithium-sulfur batteries

Key Words:SOLID-ELECTROLYTE INTERPHASE; MXENE NANOSHEETS; HOST MATERIAL; NANOSPHERES; CATHODE; LIFE; CONVERSION
Abstract:Lithium-sulfur (Li-S) batteries face a few vital issues, including poor conductivity, severe volume expansion/contraction, and especially the detrimental shuttle effect during the long-term electrochemical process. Herein, we designed a hierarchical MXene@TiO(2)nanoarrayvia in situsolvothermal strategies followed by heat treatment. The MXene@TiO(2)heterostructure achieves superior charge transfer and sulfur encapsulation. Based on the polar-polar and Lewis acid-base mechanism, the robust dual chemisorption capability to trap polysulfides can be synergistically realized through the intense polarity of TiO(2)and the abundant acid metal sites of MXene. Hence, the MXene@TiO(2)nanoarray as a sulfur host retains a substantially stable discharge capacity of 612.7 mA h g(-1)after 500 cycles at a rate of 2 C, which represents a low fading rate of 0.058% per cycle.
Volume:12
Issue:32
Translation or Not:no