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

被引:21
作者
Gao, Lvlv [1 ]
Sheng, Tian [1 ]
Ren, Haibo [1 ,2 ]
Liu, Terence Xiaoteng [1 ,3 ]
Birkett, Martin [3 ]
Joo, Sang Woo [1 ,4 ]
Huang, Jiarui [1 ,2 ]
机构
[1] Anhui Normal Univ, Coll Chem & Mat Sci, Anhui Lab Mol Based Mat, Key Lab Funct Mol Solids,Minist Educ, Wuhu 241002, Anhui, Peoples R China
[2] Anhui Polytech Univ, Modern Technol Ctr, Sch Mat Sci & Engn, Wuhu 241000, Anhui, Peoples R China
[3] Northumbria Univ, Fac Engn & Environm, Newcastle Upon Tyne NE1 8ST, England
[4] Yeungnam Univ, Sch Mech Engn, Gyongsan 712749, Gyeoungbuk, South Korea
基金
新加坡国家研究基金会; 英国工程与自然科学研究理事会; 中国国家自然科学基金;
关键词
BN nanocrystal; Sandwich structure; Catalytic effect; Sulfur cathode; Effective chemisorption capability; POROUS CARBON; PERFORMANCE; POLYSULFIDES; CONVERSION; CATHODE; LAYER; BN;
D O I
10.1016/j.apsusc.2022.153687
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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.
引用
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页数:10
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