隨著2050淨零碳排目標推動，電動車與再生能源儲能系統快速發展，使高能量密度鋰離子電池之需求持續提升。因此，開發兼具高容量與良好循環穩定性之新型負極材料，成為鋰離子電池研究中的重要課題。本研究以高熵氧化物 (High entropy oxide， HEO)作為鋰離子電池負極材料，採用噴霧造粒結合高溫燒結法製備岩鹽結構之Co0.2Cu0.2Mg0.2Ni0.2Zn0.2O高熵氧化物，並以900 °C與1000 °C作為不同燒結條件，探討燒結溫度對材料特性與電化學表現之影響。 本研究首先將不同燒結條件之高熵氧化物組裝為HEO/Li半電池，藉由充放電測試、循環穩定性分析與電化學阻抗圖譜，評估其作為負極材料之表現，並作為後續全電池設計之基礎。結果顯示，以1000 °C燒結樣品展現較佳的電化學表現，其活化後第一圈比容量為330.05 mAh g-1，高於900 °C燒結樣品的291.24 mAh g-1；經100圈循環後，000 °C 燒結樣品之容量保持率為91.21%，亦高於900 °C燒結樣品之 86.98%，顯示較高燒結溫度有助於提升高熵氧化物負極之循環穩定性與反應可逆性。 為進一步評估高熵氧化物負極於實際電池系統中的應用潛力，本研究選用磷酸錳鐵鋰 (Lithium Manganese Iron Phosphate， LMFP)作為正極材料，組裝HEO/LMFP全電池。在LMFP/全電池組裝前，亦先將LMFP正極組裝為LMFP/Li半電池，分析其電化學特性，並探討不同輾壓程度造成之孔隙度差異對阻抗行為的影響，結果顯示，壓實密度對界面阻抗的影響有限，主要影響的是鋰離子的擴散現象。綜合HEO負極與LMFP正極之半電池結果，本研究進一步建立全電池操作參數並進行電化學測試，初步證實CoCuMgNiZnO高熵氧化物具有作為鋰離子電池負極材料之應用潛力。;Driven by the global goal of achieving net-zero carbon emissions by 2050， the rapid development of electric vehicles and renewable energy storage systems has increased the demand for high-energy-density lithium-ion batteries. Therefore， developing novel anode materials with high capacity and good cycling stability has become an important research topic. In this study， rock-salt-structured Co0.2Cu0.2Mg0.2Ni0.2Zn0.2O high-entropy oxide (HEO) was prepared by spray granulation combined with high-temperature sintering at 900 °C and 1000 °C， and its electrochemical performance as an anode material was investigated. The prepared HEO samples were assembled into HEO/Li half-cells and evaluated through charge–discharge tests， cycling stability analysis， and electrochemical impedance spectroscopy. The sample sintered at 1000 °C exhibited better electrochemical performance， delivering a first specific capacity of 330.05 mAh g-1 after activation， higher than that of the 900 °C-sintered sample， 291.24 mAh g-1. After 100 cycles， the 1000 °C-sintered sample retained 91.21% of its capacity， compared with 86.98% for the 900 °C-sintered sample， indicating improved cycling stability and reaction reversibility. To further evaluate its practical application potential， lithium manganese iron phosphate (LMFP) was selected as the cathode material to assemble HEO/LMFP full cells. Before full-cell assembly， LMFP/Li half-cells were fabricated to analyze the cathode behavior and the effect of calendering-induced porosity variation. The results indicate that the compaction density has a limited effect on the interfacial resistance， while its primary influence is on lithium-ion diffusion. Based on the half-cell results， full-cell operating parameters were established and electrochemical tests were conducted， preliminarily demonstrating the potential of CoCuMgNiZnO high-entropy oxide as an anode material for lithium-ion batteries.
