An Improved Li–SeS2 Battery with High Energy Density and Long Cycle Life. Issue 15 (25th April 2017)

• Record Type: Journal Article
• Authors: Li, Zhen; Zhang, Jintao; Wu, Hao Bin; Lou, Xiong Wen (David)
• Is Part Of: Advanced energy materials. Volume 7:Issue 15(2017)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2017-04-25
• Subjects: composite cathode -- electrochemical performance -- Li–SeS2 batteries; Energy harvesting -- Materials -- Periodicals; Energy conversion -- Materials -- Periodicals; Energy storage -- Materials -- Periodicals; Photovoltaics -- Periodicals; Fuel cells -- Periodicals; Thermoelectric materials -- Periodicals; 621.31
• DOI: 10.1002/aenm.201700281
• Languages: English
• ISSNs: 1614-6832

Abstract

Abstract : 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. Abstract : 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.