Sulfur-doped graphene-decorated Li2FeSiO4@C nanocomposite: A novel cathode material for lithium energy storage

IF 3 4区材料科学 Q3 CHEMISTRY, PHYSICAL

Solid State Ionics Pub Date : 2025-02-01 DOI:10.1016/j.ssi.2024.116780

Yanmei Zuo, Li Hua, Deqi Huang, Zhifang Zuo

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引用次数: 0

Abstract

Li₂FeSiO₄ has been regarded as a highly advanced cathode material for lithium energy storage because of its high theoretical capacity, good chemical stability and low cost. However, the low Li⁺ diffusion coefficient and poor electrical conductivity of pure Li₂FeSiO₄ result in bad rate capability and cyclic property. To address these problems, the designed sulfur-doped graphene-promoted Li₂FeSiO₄@C (abbreviated as SG-LFS@C) nanocomposite has been fabricated by a simple sol-gel technology and high-temperature solid-state reaction. Electrochemical tests demonstrate that the resulted SG-LFS@C displays superior lithium storage properties than Li₂FeSiO₄@C (abbreviated as LFS@C). The initial discharge capacities of SG-LFS@C were 260.7 and 139.1 mAh g⁻¹ at 0.1 and 10C, respectively. Even after 400 cycles at 20C, the specific capacity of SG-LFS@C can still reach 116.5 mAh g⁻¹ with the capacity retention rate of 94.9 %. The superior lithium storage performances for SG-LFS@C cathode are mainly attributed to the designed conductive nanostructures and the formed nanosized Li₂FeSiO₄ particles. Thus, this novel concept provides a new direction for further research on other lithium-ion batteries cathode materials.

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来源期刊

Solid State Ionics 物理-物理：凝聚态物理

CiteScore

6.10

自引率

3.10%

发文量

152

审稿时长

58 days

期刊介绍： This interdisciplinary journal is devoted to the physics, chemistry and materials science of diffusion, mass transport, and reactivity of solids. The major part of each issue is devoted to articles on: (i) physics and chemistry of defects in solids; (ii) reactions in and on solids, e.g. intercalation, corrosion, oxidation, sintering; (iii) ion transport measurements, mechanisms and theory; (iv) solid state electrochemistry; (v) ionically-electronically mixed conducting solids. Related technological applications are also included, provided their characteristics are interpreted in terms of the basic solid state properties. Review papers and relevant symposium proceedings are welcome.