Propelling polysulfide conversion for high-loading lithium-sulfur batteries through highly sulfiphilic NiCo2S4 nanotubes

被引:95
作者
Li, Sha [1 ,2 ]
Xu, Pan [1 ]
Aslam, Muhammad Kashif [2 ]
Chen, Changguo [2 ,3 ]
Rashid, Arif [4 ]
Wang, Gulian [4 ]
Zhang, Li [1 ,4 ]
Mao, Bingwei [1 ]
机构
[1] Xiamen Univ, Coll Chem & Chem Engn, Dept Chem, Collaborat Innovat Ctr Chem Energy Mat,State Key, Xiamen 361005, Peoples R China
[2] Chongqing Univ, Coll Chem & Chem Engn, Chongqing 401331, Peoples R China
[3] Guizhou Meiling Power Sources Co Ltd, State Key Lab Adv Chem Power Sources, Zunyi 563003, Guizhou, Peoples R China
[4] Soochow Univ, Soochow Inst Energy & Mat Innovat, Coll Energy, Suzhou 215006, Peoples R China
基金
中国国家自然科学基金;
关键词
High-sulfur-loading Li-S battery; Open-hole NiCo2S4 nanotube; Polysulfide immobilization; Polysulfide conversion kinetics; Self-assembled NiCo2S4 granule; METAL-ORGANIC FRAMEWORK; CARBON NANOSHEETS; ENERGY-STORAGE; PERFORMANCE; DESIGN; ELECTRODE; COMPOSITE; NANOPARTICLES; SEPARATOR; INTERFACE;
D O I
10.1016/j.ensm.2020.01.017
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
Li-S batteries have received unprecedented attention owing to their exceptionally high energy density and low cost. Nevertheless, the daunting challenges of insulating properties, soluble polysulfide shuttling, drastic volume change and sluggish polysulfide conversion kinetics, still hinder their application towards commercialization. Very recently, exciting progresses have been made on inorganic/organic polar hosts as either polysulfide immobilizers or polysulfide redox accelerators, targeting durable Li-S batteries. Herein, self-assembled NiCo2S4 granules comprising secondary open-hole tubular structures are first devised as highly-efficient host materials for high-sulfur-loading and durable Li-S batteries. NiCo2S4 hosts are featured with their large porosity, high electronic conductivity, rapid ion conduction, strong polysulfide immobilization capability and catalytic effect on polysulfide redox, thus greatly ameliorating the polysulfide-shuttle issue and accelerating the polysulfide conversion kinetics. Therefore, the NiCo2S4/S cathode shows a reversible capacity of 1387 mAh g(-1) at 0.2C and retains a value of 543 mAh g(-1) after 500 cycles at 2 C. Impressively, the NiCo2S4/S cathode with a sulfur loading of 8.9 mg cm(-2) exhibits high areal capacity of 8.3 mAh cm(-2), low polarization and high cycling stability. Moreover, the as-derived soft-package battery with a 4.5 mg cm(-2) sulfur loading can power 169 light-emitting diodes, verifying its great potential for practical application.
引用
收藏
页码:51 / 60
页数:10
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