以Mn3O4及有機金屬骨架衍生CoS2修飾南瓜衍生碳材作為鋰(鈉)離子電池負極材料之應用

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/94644

Title:	以Mn3O4及有機金屬骨架衍生CoS2修飾南瓜衍生碳材作為鋰(鈉)離子電池負極材料之應用
Authors:	林昀築;Lin, Yun-Chu
Contributors:	化學學系
Keywords:	生質碳材;有機金屬骨架材料;鋰(鈉)離子電池;過渡金屬材料
Date:	2024-07-11
Issue Date:	2024-10-09 15:21:09 (UTC+8)
Publisher:	國立中央大學
Abstract:	本論文分為兩部分，第一部分研究南瓜衍生碳材的碳化過程、KOH活化劑含量和活化鍛燒溫度，旨在找出最佳條件以得到南瓜衍生活化碳材PAC-4-6。隨後，利用含浸法將過渡金屬氧化物Mn3O4修飾於PAC-4-6，合成出Mn3O4@PAC-4-6複合材料，並探討其作為鋰（鈉）離子電池負極材料的應用。經XPS與TEM mapping分析顯示，PAC-4-6具有微量的氮、硫和氧元素，達到異原子自摻雜的效果。實驗結果顯示，Mn3O4(30)@PAC-4-6具有最佳的電化學表現，在鋰離子電池系統中以電流密度0.1 A/g進行充放電循環測試，經過70圈後能達到879.8 mAh/g優異電容量，另外在鈉離子系統中以電流密度0.05 A/g進行充放電循環測試，經過200圈後，電容量穩定保持在180.1 mAh/g，顯示此材料具有良好的電性表現。第二部分的研究中，以ZIF-67作為前驅物，經H2/Ar混合氣體鍛燒處理後，Co2+被還原成Co奈米粒子，得到Co@C，再與親水性PAC-4-6混合進行硫化反應，最終合成出二硫化鈷修飾生質碳材CoS2@PAC-4-6，並應用於鋰離子電池的負極材料。添加PAC-4-6生質碳材不僅提升材料的導電性，且有效緩解了CoS2在循環過程中體積膨脹問題。在鋰離子電池系統中以電流密度0.1 A/g進行充放電循環測試，經過240圈後，達到710.3 mAh/g。這表明材料具有良好的循環穩定性。;This thesis is divided into two parts. The first part investigates the carbonization process of pumpkin-derived carbon material, KOH activator content, and the activation calcination temperature, aiming to identify the optimal conditions to obtain the pumpkin-derived activated carbon material PAC-4-6. Mn3O4 is incorporated into PAC-4-6 using an impregnation method, synthesizing Mn3O4@PAC-4-6 composite material, which is evaluated as an anode material for lithium and sodium ion batteries. XPS and TEM mapping analyses show that PAC-4-6 contains trace amounts of nitrogen, sulfur, and oxygen, indicating heteroatom self-doping. Experimental results demonstrate that Mn3O4(30)@PAC-4-6 exhibits excellent electrochemical performance, achieving a capacity of 879.8 mAh/g after 70 cycles at 0.1 A/g in lithium-ion batteries, and maintaining a stable capacity of 180.1 mAh/g after 200 cycles at 0.05 A/g in sodium-ion batteries. The second part uses ZIF-67 as a precursor, which is calcined in a H2/Ar mixed gas to reduce Co2+ to Co nanoparticles, forming Co@C. This is mixed with hydrophilic PAC-4-6 and subjected to a sulfidation reaction to synthesize CoS2@PAC-4-6, applied as an anode material for lithium-ion batteries. Adding PAC-4-6 enhances conductivity and mitigates volume expansion of CoS2 during cycling. The lithium-ion battery achieves a specific capacity of 710.3 mAh/g after 240 cycles at 0.1 A/g, indicating excellent cycling stability.
Appears in Collections:	[Graduate Institute of Chemistry] Electronic Thesis & Dissertation

Files in This Item:

File	Description	Size	Format
index.html		0Kb	HTML	11	View/Open

社群 sharing

Loading...