Sulfur-doped CMK-5 with expanded lattice for high-performance lithium ion batteries

Heteroatom-doped porous carbon materials are very attractive for lithium ion batteries (LIBs) owing to their high specific surface areas, open pore structures, and abundant active sites. However, heteroatom-doped porous carbon with very high surface area and large pore volume are highly desirable but still re-main a big challenge. Herein, we reported a sulfur-doped mesoporous carbon (CMK-5-S) with nanotubes array structure, ultrahigh specific surface area (1390 m2/g), large pore volume (1.8 cm3/g), bimodal pore size distribution (2.9 and 4.6 nm), and high sulfur content (2.5 at%). The CMK-5-S used as an anode mate-rial for LIBs displays high specific capacity, excellent rate capability and highly cycling stability. The initial reversible specific capacity at 0.1 A/g is as high as 1580 mAh/g and simultaneously up to 701 mAh/g at 1 A/g even after 500 cycles. Further analysis reveals that the excellent electrochemical storage performances is attributed to its unique structures as well as the expanded lattice by sulfur-doping.(c) 2023 Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences.

Automated summary

In this study, a sulfur-doped mesoporous carbon material with a nanotube array structure, ultrahigh specific surface area, large pore volume, bimodal pore size distribution, and high sulfur content was reported. It exhibited high specific capacity, excellent rate capability, and cycling stability as an anode material for lithium ion batteries. The excellent electrochemical storage performance was attributed to its unique structures and lattice expansion caused by sulfur doping.