Insight into Accelerating Polysulfides Redox Kinetics by BN@MXene Heterostructure for Li-S Batteries

Yaochen Song; Pengkai Tang; Yi Wang; Linnan Bi; Qi Liang; Yilin Yao; Yuhong Qiu; Liang He; Qingyu Xie; Peng Dong; Yingjie Zhang; Yao Yao; Jiaxuan Liao; Sizhe Wang

doi:10.1002/smll.202302386

Insight into Accelerating Polysulfides Redox Kinetics by BN@MXene Heterostructure for Li-S Batteries

Small. 2023 Sep;19(38):e2302386. doi: 10.1002/smll.202302386. Epub 2023 May 17.

Authors

Yaochen Song^{1

2}, Pengkai Tang^{1

2}, Yi Wang^{1

3}, Linnan Bi^{1

2}, Qi Liang^{1

3}, Yilin Yao^{1

3}, Yuhong Qiu^{1

2}, Liang He¹, Qingyu Xie¹, Peng Dong⁴, Yingjie Zhang⁴, Yao Yao⁴, Jiaxuan Liao^{1

2}, Sizhe Wang^{1

3}

Affiliations

¹ Yangtze Delta Region Institute (QuZhou), University of Electronic Science and Technology of China, Chengdu, 324000, P. R. China.
² School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu, 611731, P. R. China.
³ School of materials Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science & Technology, Xi'an, 710021, P. R. China.
⁴ National and Local Joint Engineering Laboratory for Lithium-ion Batteries and Materials Preparation Technology, Key Laboratory of Advanced Battery Materials of Yunnan Province, Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, 650093, P. R. China.

PMID: 37196415
DOI: 10.1002/smll.202302386

Abstract

Sluggish redox kinetics and shuttle effect of polysulfides hinder the extensive application of the lithium-sulfur batteries (LSBs). Herein a functional heterostructure of boron nitride (BN) and MXene with an alternately layered structure (BN@MXene) is designed as separator interlayer. High efficiency Li⁺ transmission, uniform lithium deposition, strong adsorption, and efficient catalytic conversion activities of lithium polysulfides (LiPSs) realized by this heterostructure are confirmed by experiments and theoretical calculations. The alternately layered structure provides unblocked ion transmission channels and abundant active sites to accelerate the polysulfides redox kinetics with reduced energy barriers of oxidation and reduction reactions. As a result, the LSBs deliver an initial discharge capacity of up to 1273.9 mAh g^-1 at 0.2 °C and a low decay of 0.058% per cycle in long-term cycling up to 700 cycles at 1 °C. This work provides an effective designing strategy to accelerate the polysulfides redox kinetics for advanced Li-S electrochemical system.

Keywords: heterostructures; interlayers; lithium polysulfides; redox kinetics.

Abstract

Grants and funding