Advanced Energy Materials
Advanced Energy Materials
5 years ago

An Improved Li–SeS2 Battery with High Energy Density and Long Cycle Life

An Improved Li–SeS2 Battery with High Energy Density and Long Cycle Life
Jintao Zhang, Hao Bin Wu, Zhen Li, Xiong Wen (David) Lou
Selenium–sulfur solid solutions are a class of potential cathode materials for high energy batteries, since they have higher theoretical capacities than selenium and improved conductivity over sulfur. Here, a high-performance cathode material by confining 70 wt% of SeS2 in a highly ordered mesoporous carbon (CMK-3) framework with a polydopamine (PDA) protection sheath for novel Li–Se/S batteries is reported. With a relatively high SeS2 mass loading of 2.6–3 mg cm−2, the CMK-3/SeS2@PDA cathode exhibits a high capacity of >1200 mA h g−1 at 0.2 A g−1, excellent C-rate capability of 535 mA h g−1 at 5 A g−1, and prolonged life over 500 cycles. Benefitting from the unique advantages of SeS2 and the rationally designed host framework, this new cathode material demonstrates a feasible strategy to overcome the bottlenecks of current Li–S systems for high energy density rechargeable batteries. A high-performance cathode material is synthesized by confining SeS2 in a highly ordered mesoporous carbon framework with a polydopamine protection sheath for Li–SeS2 batteries. This new cathode material might overcome the bottlenecks of current Li–S systems for high energy density rechargeable batteries.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/aenm.201700281

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