Catalysis has been regarded as an effective strategy to mitigate sluggish reaction kinetics and serious shuttle effect of Li-S batteries.Herein,a spherical structure consists of ultrathin layered Ti3C2Tx-TiN heterostructures(MX-TiN)through in-situ nitridation method is reported.Through controllable nitridation,highly conductive TiN layer grew on the surface and close coupled with interior MXene to form unique 2D heterostructures.The ultrathin hetero structure with only several nanometers in thickness enables outstanding ability to shorten electrons diffusion distance during electrochemical reactions and enlarge active surface with abundant adsorptive and catalytic sites.Moreover,the(001)surface of TiN is dominated by metallic Ti-3d states,which ensures fast transmitting electrons from high conductive MX-TiN matrix and thus guarantees efficient catalytic performance.Calculations and experiments demonstrate that polysulfides are strongly immobilized on MX-TiN,meanwhile the bidirectional reaction kinetics are catalyti-cally enhanced by reducing the conversion barrier between liquid LiPSs and solid Li2S2/Li2S.As a result,the S/MX-TiN cathode achieves excellent long-term cyclability with extremely low-capacity fading rate of 0.022％over 1000 cycles and remarkable areal capacity of 8.27 mAh cm-2 at high sulfur loading and lean electrolytes.

Hao Wang;Zhe Cui;Shu-Ang He;Jinqi Zhu;Wei Luo;Qian Liu;Rujia Zou

State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,College of Materials Science and Engineering,Donghua University,Shanghai 201620,People's Republic of China;Department of Physics,College of Science,Donghua University,Shanghai 201620,People's Republic of China

纳微快报（英文）

[1]Hao Wang;Zhe Cui;Shu-Ang He;Jinqi Zhu;Wei Luo;Qian Liu;Rujia Zou-.Construction of Ultrathin Layered MXene-TiN Heterostructure Enabling Favorable Catalytic Ability for High-Areal-Capacity Lithium-Sulfur Batteries)[J].纳微快报（英文）,2022(11):324-340

Areal,catalyti

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