Sulfur-bridged bonds enabled structure modulation and space confinement of MnS for superior sodium-ion capacitors

Yining Chen; Shaohui Li; Jingwei Chen; Lin Gao; Pengzhi Guo; Cong Wei; Jianwei Fu; Qun Xu

doi:10.1016/j.jcis.2024.03.028

Sulfur-bridged bonds enabled structure modulation and space confinement of MnS for superior sodium-ion capacitors

J Colloid Interface Sci. 2024 Jun 15:664:360-370. doi: 10.1016/j.jcis.2024.03.028. Epub 2024 Mar 10.

Authors

Yining Chen¹, Shaohui Li¹, Jingwei Chen², Lin Gao³, Pengzhi Guo¹, Cong Wei⁴, Jianwei Fu⁵, Qun Xu⁶

Affiliations

¹ School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, PR China.
² School of Materials Science and Engineering, Ocean University of China, Qingdao 266100, PR China.
³ Hubei Key Laboratory of Energy Storage and Power Battery, School of Mathematics, Physics and Optoelectronic Engineering, Hubei University of Automotive Technology, Shiyan 442002, PR China.
⁴ School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, PR China. Electronic address: weicong@zzu.edu.cn.
⁵ School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, PR China. Electronic address: jwfu@zzu.edu.cn.
⁶ School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, PR China; Henan Institute of Advanced Technology, Zhengzhou University, Zhengzhou 450001, PR China. Electronic address: qunxu@zzu.edu.cn.

PMID: 38479272
DOI: 10.1016/j.jcis.2024.03.028

Abstract

Manganese sulfide (MnS) is a promising converion-type anode for sodium storage, owing to the virtues of high theoretical capacity, coupled with it crustal abundance and cost-effectiveness. Nevertheless, MnS suffers from inadequate electronic conductivity, sluggish Na⁺ reaction kinetics and considerable volume variation during discharge/charge process, thereby impeding its rate capability and capacity retention. Herein, a novel lamellar heterostructured composite of Fe-doped MnS nanoparticles/positively charged reduced graphene oxide (Fe-MnS/PG) was synthesized to overcome these issues. The Fe-doping can accelerate the ion/electron transfer, endowing fast electrochemical kinetics of MnS. Meanwhile, the graphene space confinement with strong MnSC bond interactions can facilite the interfacial electron transfer, hamper volume expansion and aggregation of MnS nanoparticles, stabilizing the structural integrity, thus improving the Na⁺ storage reversibility and cyclic stability. Combining the synergistic effect of Fe-doping and space confinement with strong MnSC bond interactions, the as-produced Fe-MnS/PG anode presents a remarkable capacity of 567 mAh/g at 0.1 A/g and outstanding rate performance (192 mAh/g at 10 A/g). Meanwhile, the as-assembled sodium-ion capacitor (SIC) can yield a high energy density of 119 Wh kg^-1 and a maximum power density of 17500 W kg^-1, with capacity retention of 77 % at 1 A/g after 5000 cycles. This work offers a promising strategy to develop MnS-based practical SICs with high energy and long lifespan, and paves the way for fabricating advanced anode materials.

Keywords: Manganese sulfide; Mn–S–C bond interactions; Sodium ion capacitor; Space confinement; Structure modulation.