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

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.