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Gallium doping induces enhanced cyclic stability and rate capacity of lithium-ion battery silicon anode.

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Title: Gallium doping induces enhanced cyclic stability and rate capacity of lithium-ion battery silicon anode.
Authors: Wang, Zihao1 (AUTHOR), Wu, Fan1,2 (AUTHOR), Shu, Jinhao1 (AUTHOR), Shi, Hongcao1 (AUTHOR), Hu, Guijia2 (AUTHOR), Yan, Xiangshun2 (AUTHOR), Wang, Yongshu2 (AUTHOR), Chen, Yuan1 (AUTHOR) chenyuan@sdust.edu.cn
Source: Journal of Materials Science. Jun2026, Vol. 61 Issue 23, p16598-16611. 14p.
Subjects: Doping agents (Chemistry), Negative electrode, Electrochemical analysis, Lithium-ion batteries, Nanoparticles, Electric conductivity
Abstract: Improving the long-term cyclic stability and rate capacity is key to the commercial application of the lithium-ion battery Si anodes. However, the severe volume expansion and low conductivity limit the electrochemical performance. This work reports a gallium (Ga) doping strategy to improve the long-term cyclic stability and rate capacity. Highly crystalline and uniform grain-sized Ga-doped Si nanoparticles are obtained through the molten salt process. It not only shows significantly increased conductivity (resistance reduced by 5.4-fold), but also presents a faster diffusion coefficient. Furthermore, the optimized electrode delivers a high initial discharge capacity of 2715 mAh g−1 with an initial Coulombic efficiency of 89.12%. Additionally, the anode exhibits excellent rate capability; the high-rate capabilities of 2826 mAh g−1, 2169 mAh g−1, 1606 mAh g−1, 1016 mAh g−1, and 404 mAh g−1 are obtained at the current density of 0.1 A g−1, 0.5 A g−1, 1 A g−1, 2 A g−1, and 5 A g−1, respectively. Moreover, as the current density is restored to 0.1 A g−1, the capacity recovered to 2035 mAh g−1, which represents 72% of the initial reversible capacity. This work not only demonstrates that Ga can serve as a promising dopant for enhancing the long-cycle and rate performance of silicon-based anodes, but also underscores the significance of lattice dynamics and electronic structure tuning in the design of high-performance silicon anodes. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Improving the long-term cyclic stability and rate capacity is key to the commercial application of the lithium-ion battery Si anodes. However, the severe volume expansion and low conductivity limit the electrochemical performance. This work reports a gallium (Ga) doping strategy to improve the long-term cyclic stability and rate capacity. Highly crystalline and uniform grain-sized Ga-doped Si nanoparticles are obtained through the molten salt process. It not only shows significantly increased conductivity (resistance reduced by 5.4-fold), but also presents a faster diffusion coefficient. Furthermore, the optimized electrode delivers a high initial discharge capacity of 2715 mAh g−1 with an initial Coulombic efficiency of 89.12%. Additionally, the anode exhibits excellent rate capability; the high-rate capabilities of 2826 mAh g−1, 2169 mAh g−1, 1606 mAh g−1, 1016 mAh g−1, and 404 mAh g−1 are obtained at the current density of 0.1 A g−1, 0.5 A g−1, 1 A g−1, 2 A g−1, and 5 A g−1, respectively. Moreover, as the current density is restored to 0.1 A g−1, the capacity recovered to 2035 mAh g−1, which represents 72% of the initial reversible capacity. This work not only demonstrates that Ga can serve as a promising dopant for enhancing the long-cycle and rate performance of silicon-based anodes, but also underscores the significance of lattice dynamics and electronic structure tuning in the design of high-performance silicon anodes. [ABSTRACT FROM AUTHOR]
ISSN:00222461
DOI:10.1007/s10853-026-12839-0