N, O co-doped chlorella-based biomass carbon modified separator for lithium-sulfur battery with high capacity and long cycle performance

Qian Li; Yongpeng Liu; Liwen Yang; Yang Wang; Yihua Liu; Yanxiao Chen; Xiaodong Guo; Zhenguo Wu; Benhe Zhong

doi:10.1016/j.jcis.2020.11.084

N, O co-doped chlorella-based biomass carbon modified separator for lithium-sulfur battery with high capacity and long cycle performance

J Colloid Interface Sci. 2021 Mar:585:43-50. doi: 10.1016/j.jcis.2020.11.084. Epub 2020 Nov 26.

Authors

Qian Li¹, Yongpeng Liu¹, Liwen Yang¹, Yang Wang¹, Yihua Liu¹, Yanxiao Chen², Xiaodong Guo¹, Zhenguo Wu¹, Benhe Zhong¹

Affiliations

¹ School of Chemical Engineering, Sichuan University, No. 24 South Section 1, Yihuan Road, Chengdu 610065, China; Engineering Research Center for Comprehensive Utilization and Cleaning Process of Phosphate Resource, Ministry of Education, Chengdu 610065, China.
² School of Chemical Engineering, Sichuan University, No. 24 South Section 1, Yihuan Road, Chengdu 610065, China; Engineering Research Center for Comprehensive Utilization and Cleaning Process of Phosphate Resource, Ministry of Education, Chengdu 610065, China. Electronic address: yxchen888@163.com.

PMID: 33279705
DOI: 10.1016/j.jcis.2020.11.084

Abstract

As a lithium-ion secondary battery with high energy density, lithium-sulfur batteries have very bright development prospects. But the shuttle effect is still a thorny issue in the development process. The N, O co-doped chlorella-based biomass carbon (CBBC) synthesized by chemical activation method possesses a microporous and mesoporous composite structure, large specific surface area, and good electrical conductivity. The CBBC interlayer can improve the wettability between the separator and the electrolyte, and accelerate the transmission of Li⁺. N, O heteroatoms have a strong chemical adsorption operation for LiPs. The modified separator restrains lithium polysulfide through physical barriers and chemical adsorption, and improves the capacity and cycle performance of lithium-sulfur batteries. The batteries with CBBC exhibit excellent cycling stability (0.067% per cycle at 0.5C) and better rate performance (918 mAh g^-1 at 2C). The first discharge capacity at 0.05C was 1540 mAh g^-1. Even after 600 cycles the discharge capacity retains 656 mAh g^-1 at 0.5C. The low price and simple preparation of CBBC interlayer is an attractive choice for improving lithium-sulfur batteries.

Keywords: Biomass carbon; Chlorella-based biomass carbon interlayer; Li-S battery; Modified separator; Polysulfides.