異質原子取代與銅摻雜修飾之導電碳以提升鋰離子電池 負極之電極性能;Modified Conductive Carbon with Heteroatom Substitution and Cu Doping for Improved Electrode Performance of Lithium-Ion Battery Anodes

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題名:	異質原子取代與銅摻雜修飾之導電碳以提升鋰離子電池負極之電極性能;Modified Conductive Carbon with Heteroatom Substitution and Cu Doping for Improved Electrode Performance of Lithium-Ion Battery Anodes
作者:	段雲昕;Duan, Yun-Xin
貢獻者:	化學工程與材料工程學系
關鍵詞:	導電碳;異質原子;硼摻雜;銅摻雜;鋰離子電池;負極;conductive carbon;heteroatom;boron doping;copper doping;lithium-ion battery;anode
日期:	2025-07-21
上傳時間:	2025-10-17 11:19:25 (UTC+8)
出版者:	國立中央大學
摘要:	隨著電動車與儲能系統之應用日益廣泛，鋰離子電池對高能量密度與高倍率性能的需求持續提升。其中，導電添加劑作為電極材料的重要輔助組件，雖不參與電化學反應，卻對電極導電性與整體性能具有決定性影響。為提升傳統導電碳的電子傳導效率與界面穩定性，本研究以商用中空碳球PC20HT為前驅體，分別進行硼摻雜（PCB）及進一步硼銅共摻雜（PCBCu）改質，藉由異質原子與金屬摻雜協同調控導電碳之微結構與化學性質。 PCB樣品的XRD與拉曼分析顯示石墨化程度顯著提升，並形成p型導電結構，提升電子傳輸效率。應用於石墨半電池中，PCB相較於Super P導電碳展現出更佳的倍率性能與循環穩定性，在0.2C下初始放電容量達389.88 mAh/g，經100圈後仍維持約396.5 mAh/g，容量保持率達101.7%，並有效降低電荷轉移阻抗（Rct）與界面阻抗（RSEI），證實硼摻雜對碳材結構與界面行為之正向影響。進行硼銅共摻雜後，所得PCBCu導電碳於微觀形貌與缺陷分布上表現出更多活性位點與連續電子通道，其應用於石墨半電池時在0.2C初始放電容量高達399.61 mAh/g，且100圈後仍有425.0 mAh/g之容量，保持率達106.4%。在倍率性能部分在3C電流密度下85.1%電容保持率，顯示其於高倍率儲能系統中之應用潛力。綜合而言，本研究證實硼與銅之協同摻雜可有效提升導電碳材料的電子導電性與結構穩定性，進而強化其於石墨系統中的倍率性能與循環壽命，展現其作為次世代高性能鋰離子電池導電劑之應用價值。 ;With the rapid expansion of electric vehicles and energy storage systems, the demand for lithium-ion batteries with high energy density and high-rate performance continues to rise. Among the key components of electrode materials, conductive additives—though electrochemically inert—play a critical role in determining the electrode′s electrical conductivity and overall performance. To enhance the electronic conductivity and interfacial stability of traditional conductive carbons, this study employs commercially available hollow carbon spheres (PC20HT) as the precursor and introduces boron doping (PCB) and further boron-copper co-doping (PCBCu) modifications. Through the synergistic effects of heteroatom and metal doping, the microstructure and chemical properties of the conductive carbon are effectively tuned. The PCB sample exhibits significantly enhanced graphitization as revealed by XRD and Raman analyses, along with the formation of a p-type conductive structure that facilitates electron transport. When applied to graphite half-cells, PCB demonstrates superior rate capability and cycling stability compared to commercial Super P. It delivers an initial discharge capacity of 389.88 mAh/g at 0.2C and maintains approximately 396.5 mAh/g after 100 cycles, achieving a capacity retention of 101.7%. Electrochemical impedance spectroscopy further confirms reduced charge transfer resistance (Rct) and interfacial resistance (RSEI), validating the positive influence of boron doping on both carbon structure and interface behavior. Following boron-copper co-doping, the resulting PCBCu conductive carbon exhibits more active sites and continuous electron pathways in its microstructure and defect distribution. When applied to graphite half-cells, it achieves a high initial discharge capacity of 399.61 mAh/g at 0.2C and retains 425.0 mAh/g after 100 cycles, corresponding to a capacity retention of 106.4%. Furthermore, at a high current density of 3C, it maintains 85.1% of its capacity, indicating strong potential for high-rate energy storage applications. In summary, this study demonstrates that the synergistic doping of boron and copper significantly enhances the electrical conductivity and structural stability of conductive carbon materials, thereby improving the rate performance and cycle life of graphite-based systems. These findings underscore the promising application of the developed materials as next-generation high-performance conductive additives for lithium-ion batteries.
顯示於類別:	[化學工程與材料工程研究所] 博碩士論文

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