journal article·2021-11-23

Scalable Production of Freestanding Few-Layer β12-Borophene Single Crystalline Sheets as Efficient Electrocatalysts for Lithium–Sulfur Batteries

Haojian Lin, Haodong Shi, Zhen Wang, Yuewen Mu, Sidian Li, Jijun Zhao, Jingwei Guo, Bing Yang, Zhong-Shuai Wu, Fei Liu

ACS Nano· Volume 15· Issue 11
Publisher page

Abstract

Two-dimensional (2D) borophene has attracted tremendous interest due to its fascinating properties, which have potential applications in catalysts, energy storage devices, and high-speed transistors. In the past few years, borophene was theoretically predicted as an ideal electrode material for lithium–sulfur (Li–S) batteries because of its low-density, metallic conductivity, high Li-ion surface mobility, and strong interface bonding energy to polysulfide. But until now, borophene-based Li–S batteries have not yet been achieved in experiments due to the absence of a large-scale synthetic method of freestanding borophene nanostructures with a high enough structural stability, conductivity, and uniformity. Herein, we developed a low-temperature liquid exfoliation (LTLE) method to synthesize freestanding few-layer β12-borophene single-crystalline sheets with a P6¯m2 symmetry in tens of milligrams. The as-synthesized 2D sheets were used as the polysulfide immobilizers and electrocatalysts of Li–S batteries. The resulting borophene-based Li–S battery delivered an extralarge areal capacity of 5.2 mAh cm–2 at a high sulfur loading of 7.8 mg cm–2, an excellent rate performance of 8 C (@721 mAh g–1), and an ultralow capacity fading rate of 0.039% in 1000 cycles, outperforming commercial Li-ion batteries and many other 2D material-based Li–S batteries. Based on the density functional theory model, the excellent electrochemical performances of the borophene-based Li–S batteries should originate from the enormous enhancement of β12-borophene sheets for both the surface migration of the Li-ions and the adsorption energy of Li2Sn clusters. Our results thus demonstrate a great potential for scalable production of freestanding β12-borophene single-crystalline sheets in future high-performance Li–S batteries.
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Research context

OpenAlex topics: Advanced Battery Materials and Technologies · Advancements in Battery Materials · MXene and MAX Phase Materials

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Affiliations

State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, and School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, China

State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China

University of Chinese Academy of Sciences, Beijing 100049, China

CAS Key Laboratory of Science and Technology on Applied Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China

Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Dalian University of Technology), Ministry of Education, Dalian 116024, China

Nanocluster Laboratory, Institute of Molecular Science, Shanxi University, Taiyuan 030006, China

Key Laboratory of Chemical Lasers, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China

CAS Key Laboratory of Science and Technology on Applied Catalysis, Dalian National Laboratory for Clean Energy, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China

State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China

Funding

Guangdong Science and Technology Department · Ministry of Science and Technology of the People's Republic of China · Liaoning Revitalization Talents Program · Dalian Institute of Chemical Physics · Central University Basic Research Fund of China · Dalian Science and Technology Bureau · Natural Science Foundation of Liaoning Province · Department of Education of Guangdong Province · National Natural Science Foundation of China · Chinese Academy of Sciences · GFKJCXTQ Foundation · Joint Research Fund Liaoning-Shenyang National Laboratory for Materials Science · National Project for the Development of Key Scientific Apparatus of China · Dalian National Laboratory For Clean Energy · Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences

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