Rationally integrated nickel sulfides for lithium storage: S/N co-doped carbon encapsulated NiS/Cu2S with greatly enhanced kinetic property and structural stability

时间:2022-04-13作者:浏览量:52


Rationally integrated nickel sulfides for lithium storage: S/N co-doped carbon encapsulated NiS/Cu2S with greatly enhanced kinetic property and structural stability

作者:

Peng, WL (Peng, Weiliang) [1] , [2] ; Zhang, JH (Zhang, Junhao) [1] , [2] ; Li, SB (Li, Shaobo) [1] , [2] ; Liang, JX (Liang, Jinxia) [1] ; Hu, RZ (Hu, Renzong) [1] , [2] ; Yuan, B (Yuan, Bin) [1] , [2] ; Chen, GJ (Chen, Guojie) [3]

INORGANIC CHEMISTRY FRONTIERS

DOI10.1039/d1qi01510a

在线发表MAR 2022

已索引2022-04-01

文献类型Article; Early Access

摘要

Nickel sulfides are promising anode materials for lithium-ion batteries (LIBs) due to their high theoretical capacities but suffer from a sluggish kinetic process and poor structural stability. Herein, we develop a rationally integrated strategy for the construction of a S/N co-doped carbon-coated NiS/Cu2S composite (NiS/Cu2S@N/S-C) via a convenient one-step calcination process. Copper can be formed in situ during the lithiation process of the conversion reaction after combining nano-scale nickel sulfide with proper cuprous sulfide, which is conducive to increasing the conductivity, promoting the reversible conversion of the discharge product Li2S, and suppressing the dissolution of polysulfides, leading to the superior kinetic property and structural stability of the electrode. Notably, the S/N co-doped carbon coating with polar C-S or C-N bonds not only enhances the transfer of electrons and ions but also inhibits coarsening, agglomeration of particles and dissolution of polysulfides during lithiation. Furthermore, density functional theory (DFT) calculations show that heterogeneous atomic doping of N and S can enhance the adsorption behavior of carbon sheets to NiS, Cu2S and intermediate discharge products in LIBs, further demonstrating an improvement of lithium storage capability and cycling stability due to the S/N co-doped carbon coating. As a result, NiS/Cu2S@N/S-C possesses a considerable rate capacity of 511.7 mA h g(-1) at 3 A g(-1), and an outstanding stable capacity of 771.7 mA h g(-1) at 2 A g(-1) with a high retention rate of 98% after 1800 cycles. NiS/Cu2S@N/S-C shows remarkable comprehensive performance when compared with most reported nickel sulfide anode materials. This strategy predigests the tedious process of sulfurization and carbon encapsulation and would be of great significance to design nickel sulfide anodes with excellent lithium storage performance.


关键词

Keywords PlusHIGH-PERFORMANCE ANODEONE-POT SYNTHESISIONNANOPARTICLESGRAPHENECOMPOSITESNANOFIBERSCU2S

作者信息

通讯作者地址

Li, Shaobo;

Yuan, Bin

(通讯作者)

South China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510640, Peoples R China

通讯作者地址

Li, Shaobo;

Yuan, Bin

(通讯作者)

Key Lab Adv Energy Storage Mat Guangdong Prov, Guangzhou, Peoples R China

通讯作者地址

Chen, Guojie

(通讯作者)

Foshan Univ, Guangdong Hong Kong Macao Joint Lab Intelligent M, Foshan 528225, Peoples R China

地址

1 South China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510640, Peoples R China

2 Key Lab Adv Energy Storage Mat Guangdong Prov, Guangzhou, Peoples R China

3 Foshan Univ, Guangdong Hong Kong Macao Joint Lab Intelligent M, Foshan 528225, Peoples R China

电子邮件地址lishb08@scut.edu.cnapsheng@scut.edu.cn512088102@qq.com

类别/分类

研究方向Chemistry