Boron nitride wrapped N-doped carbon nanosheet as a host for advanced lithium-sulfur battery

Lvlv Gao, Tian Sheng, Haibo Ren*, Terence Xiaoteng Liu*, Martin Birkett, Sang Woo Joo*, Jiarui Huang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Sandwich structure of boron nitride (BN) nanocrystals wrapped with uniform interconnected N-doped carbon nanosheets (N-CNs) is prepared as a lithium-sulfur battery cathode material to overcome the sluggish redox reaction and severe “shuttle effect” of lithium polysulfides (LiPSs). The BN@N-CNs-2/S presents outstanding rate capacity of 528 mAh g−1 at 2 A g−1, with extended cycle life and sluggish capacity decrease rate of 0.026% per cycle at 2 A g−1 for more than 1000 cycles. Such high performance is a result of the unique sandwich structure of BN nanocrystals evenly compounded on N-CNs, which leads to uniform distribution of active sulfur species and effectively alleviates volume expansion in the cycling process. The BN@N-CNs sandwich structure possesses the key advantages of high conductivity of N-CNs, strong chemisorption and catalytic effect for LiPSs, which is demonstrated by theoretical calculations and cyclic voltammetry curves of the symmetrical cells.
Original languageEnglish
Article number153687
Number of pages10
JournalApplied Surface Science
Volume597
Early online date17 May 2022
DOIs
Publication statusE-pub ahead of print - 17 May 2022

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