Sandwich-like NOCC@S8/rGO composite as cathode for high energy lithium-sulfur batteries

Zhibin Jiang, Ling Chen, Wenguang Zhang, Shiyu Chen, Xiying Jian, Xiang Liu, Hongyu Chen, Chunlei Guo and Weishan Li

Energy, 2021, vol. 220, issue C

Abstract: Lithium-sulfur (Li–S) battery delivers its energy density far higher than currently commercialized lithium ion batteries, but challenges remain before it can be applied in large scale. One of the main issues is the dissolubility of intermediates, lithium polysulfides (LiPSs), of sulfur cathode. To address this issue, we report a novel composite as sulfur cathode that can highly immobilize the LiPSs and thus significantly improve the cyclic stability of Li–S battery. This composite is fabricated by successively loading S and N,O-carboxymethyl chitosan (NOCC) on graphene oxide (GO) and subsequent hydrothermal reduction, presenting a sandwich-like structure (NOCC@S8/rGO). Electrochemical measurements indicate that the as-fabricated NOCC@S8/rGO as cathode of Li–S battery exhibits a small capacity decay of 0.068% per cycle at 0.5C over 500 cycles and a significantly improved rate capability. Such superior cyclic stability and rate capability are attributed to the support to S species from rGO and the strong interaction of NOCC with LiPSs via Li–N bonds, as demonstrated by physical characterization and theoretical calculations. Considering the easy availability and environmental friendliness of NOCC, the reported composite is a promising cathode material for Li–S battery to be applied in large scale.

Keywords: Sulfur cathode; Lithium polysulfide; Immobilization; N,O-carboxymethyl chitosan; Reduced graphene oxide; Lithium-sulfur battery (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:220:y:2021:i:c:s0360544220328541

DOI: 10.1016/j.energy.2020.119747

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