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Phạm Thị Năm, Nguyễn Ngọc Đang, Nguyễn Hoàng Anh, Nguyễn Thị Thơm, Trần Nguyễn Hà Trang, Nguyễn Thị Thu Trang, Nguyễn Thu Phương, Huỳnh Lê Thanh Nguyên, Lê Viết Hải, Nguyễn Thái Hoàng, Trần Đại Lâm, Đinh Thị Mai Thanh

CHẾ TẠO COMPOSITE Si/GRAPHENE/SUPER-P ỨNG DỤNG LÀM VẬT LIỆU ANOT CHO PIN SẠC LI-ION PHÓNG-SẠC NHANH

SYNTHESIS OF Si/GRAPHENE/SUPER-P COMPOSITE APPLIED TO ANODE MATERIALS FOR FAST CHARGE-DISCHARGE FOR LI-ION BATTERIES

Tạp chí Phân tích Hóa, Lý và Sinh học

2024

2A

182

Lithium-ion batteries (LIBs), characterized by high capacity, extended lifespan, and environmental friendliness, have emerged as a leading choice in energy storage technology. However, silicon (Si) as an anode material presents significant challenges due to excessive volumetric expansion during charge and discharge cycles, leading to structural damage and performance degradation. In this study, we investigated and successfully synthesized a Si/Super P: graphene composite material using a ball milling technique to examine the impact of carbon content ratios on the stability and specific capacity of the material. Experimental results indicated that the Si/30% Super P: 50% graphene composite demonstrated the highest electrochemical performance (initial specific capacity of 1500 mAh.g-1), maintaining stable specific capacity (Coulombic efficiency > 90%) after 100 cycles and capable of fast charge-discharge at high current rates (10C). The study underscores the importance of integrating conductive Super P carbon with graphene, which forms a conductive network enhancing Li+transport and reducing internal resistance during charging and discharging. The Si/C (graphene and Super P carbon) composite material, with the combination of Super P carbon and graphene, not only provides an effective solution to mitigate Si volumetric expansion but also extends the application potential of Si in commercial anode materials for LIBs, promising a breakthrough in modern battery technology.

Lithium-ion batteries (LIBs), characterized by high capacity, extended lifespan, and environmental friendliness, have emerged as a leading choice in energy storage technology. However, silicon (Si) as an anode material presents significant challenges due to excessive volumetric expansion during charge and discharge cycles, leading to structural damage and performance degradation. In this study, we investigated and successfully synthesized a Si/Super P: graphene composite material using a ball milling technique to examine the impact of carbon content ratios on the stability and specific capacity of the material. Experimental results indicated that the Si/30% Super P: 50% graphene composite demonstrated the highest electrochemical performance (initial specific capacity of 1500 mAh.g-1), maintaining stable specific capacity (Coulombic efficiency > 90%) after 100 cycles and capable of fast charge-discharge at high current rates (10C). The study underscores the importance of integrating conductive Super P carbon with graphene, which forms a conductive network enhancing Li+transport and reducing internal resistance during charging and discharging. The Si/C (graphene and Super P carbon) composite material, with the combination of Super P carbon and graphene, not only provides an effective solution to mitigate Si volumetric expansion but also extends the application potential of Si in commercial anode materials for LIBs, promising a breakthrough in modern battery technology.

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