摻雜磁性元素(Fe、Co和Ni) 研究磁場對NVP電池性能影響

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题名:	摻雜磁性元素(Fe、Co和Ni) 研究磁場對NVP電池性能影響
作者:	黃智鋒;Huang, ChihFeng
贡献者:	物理學系
关键词:	電池;NVP;磁場;battery;NVP;magnetic field
日期:	2024-07-26
上传时间:	2024-10-09 15:48:05 (UTC+8)
出版者:	國立中央大學
摘要:	本論文研究透過檸檬酸表面活性合成具有NASICON結構的Na_3 V_2 (PO_4 )_3 (NVP)電池，外層由碳膜所包裹，並且摻雜1%和3%的磁性元素，透過磁場改變內部晶格大小，並且測試其電池的各項能力。因為在高溫800K摻雜元素會與P產生反應，有機會形成結晶，因此高摻雜下會有雜質的產生，為了避免雜質影響樣品結構，我們選用1%和3%來當作實驗對象，首先會透過XRD來確認樣品是否為NASICON結構的NVP，然後利用拉曼光譜儀分析外層無序的碳膜，並確認無序碳以及有序石墨碳的比例。透過不同的極片，銅箔以及鋁箔來分別測試樣品在低電壓以及高電壓的電池中鈉離子的嵌入攜出能力，測試前三次充放電來確認電池的充放電平台，50 Cycle變磁場測試電池的壽命，Crate變磁場測試電池快速充放電性能，最後透過EIS等校電路分析來確認電池內部的各項阻抗與擴散速率。透過研究Fe 3%鋁箔、Co 1%和3%則都會因為磁場而提升電池性能，最後的Ni則是1%的銅箔因為磁場而提升性能。 ;This thesis investigates the synthesis of NASICON-structured Na₃V₂(PO₄)₃ (NVP) batteries using citric acid as a surfactant. The batteries are coated with a carbon film and doped with 1% and 3% magnetic elements. By applying a magnetic field, the internal lattice size is altered, and various battery performance metrics are tested. At high temperatures (800K), doping elements can react with phosphorus, potentially forming crystalline structures, leading to impurity formation at high doping levels. To avoid impurities affecting the sample structure, 1% and 3% doping levels are chosen for experimentation. First, XRD is used to confirm whether the samples are NASICON-structured NVP. Raman spectroscopy is then employed to analyze the disordered carbon film on the surface and to determine the ratio of disordered carbon to ordered graphite carbon. Different current collectors, copper foil and aluminum foil, are used to test the sodium-ion intercalation and deintercalation capabilities of the samples in low-voltage and high-voltage batteries, respectively. The initial three charge-discharge cycles are tested to identify the charge-discharge platforms of the batteries. A 50-cycle test under varying magnetic fields evaluates the battery lifespan, while Crate tests under varying magnetic fields assess the battery′s fast charge-discharge performance. Finally, EIS equivalent circuit analysis is conducted to ascertain various internal resistances and diffusion rates within the battery. The study finds that using 3% Fe on aluminum foil and 1% and 3% Co improves battery performance under a magnetic field. For Ni, 1% doping on copper foil enhances performance due to the magnetic field.
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