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Li W, Luo C, Fu J, Yang J, Zhou X, Tang J, Mehdi BL. Fracture Resistant CrSi 2-Doped Silicon Nanoparticle Anodes for Fast-Charge Lithium-Ion Batteries. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024; 20:e2308304. [PMID: 38308419 DOI: 10.1002/smll.202308304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2023] [Revised: 12/16/2023] [Indexed: 02/04/2024]
Abstract
Lithium-ion batteries (LIBs) has been developed over the last three decades. Increased amount of silicon (Si) is added into graphite anode to increase the energy density of LIBs. However, the amount of Si is limited, due to its structural instability and poor electronic conductivity so a novel approach is needed to overcome these issues. In this work, the synthesized chromium silicide (CrSi2) doped Si nanoparticle anode material achieves an initial capacity of 1729.3 mAh g-1 at 0.2C and retains 1085 mAh g-1 after 500 cycles. The new anode also shows fast charge capability due to the enhanced electronic conductivity provided by CrSi2 dopant, delivering a capacity of 815.9 mAh g-1 at 1C after 1000 cycles with a capacity degradation rate of <0.05% per cycle. An in situ transmission electron microscopy is used to study the structural stability of the CrSi2-doped Si, indicating that the high control of CrSi2 dopant prevents the fracture of Si during lithiation and results in long cycle life. Molecular dynamics simulation shows that CrSi2 doping optimizes the crack propagation path and dissipates the fracture energy. In this work a comprehensive information is provided to study the function of metal ion doping in electrode materials.
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Affiliation(s)
- Weiqun Li
- Department of Mechanical, Materials and Aerospace Engineering, University of Liverpool, Liverpool, L69 3GH, UK
- The Faraday Institution, Harwell Campus, Didcot, OX11 0RA, UK
| | - Chucheng Luo
- School of Metallurgy and Environment, Central South University, Changsha, Hunan, 410083, China
- College of Chemistry and Materials Engineering, Hunan University of Arts and Science, Changde, Hunan, 415000, China
| | - Jimin Fu
- Research Institute for Intelligent Wearable Systems, School of Fashion and Textiles, Hong Kong Polytechnic University, Hong Kong SAR, 999077, P. R. China
| | - Juan Yang
- School of Metallurgy and Environment, Central South University, Changsha, Hunan, 410083, China
| | - Xiangyang Zhou
- School of Metallurgy and Environment, Central South University, Changsha, Hunan, 410083, China
| | - Jingjing Tang
- School of Metallurgy and Environment, Central South University, Changsha, Hunan, 410083, China
| | - B Layla Mehdi
- Department of Mechanical, Materials and Aerospace Engineering, University of Liverpool, Liverpool, L69 3GH, UK
- The Faraday Institution, Harwell Campus, Didcot, OX11 0RA, UK
- Albert Crewe Centre for Electron Microscopy, University of Liverpool, Liverpool, L69 3GL, UK
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