利用摻雜技術提升鋰鈦氧（Li₄Ti₅O₁₂）鋰離子電池陽極效能之進展

Recent Advances in Improvement of Electrochemical Performances of Li4Ti5O12 as Anode for Lithium Ion Battery by Various Dopants

近年來隨著儲能裝置的需求，全球鋰離子電池研究也隨之蓬勃發展。鈦酸鋰為最有潛力取代石墨之陽極材料，但本身卻面臨低電導率與低鋰離子擴散率等問題。本文介紹現今文獻，以Li4Ti5O12結構為觀點，介紹透過不同原子之摻雜(如Na+、K+、Zr4+、W6+以及Br-)進入四面體與八面體格隙，其現象能改變Li4Ti5O12的晶格常數、形貌並在保持電荷中性下元素發生的氧化還原反應，利用XRD (X-ray Diffraction)和XPS (X-ray photoelectron spectroscopy)分析證明，其結果顯示有利於改善Li4Ti5O12電導率與鋰離子擴散率等問題。

In recent years, with the demand for energy storage devices, the studies on lithium-ion batteries (LIBs) have also vigorously developed in the world. Li4Ti5O12 (LTO) is the potential candidate to replace graphite as anode for LIB. Unfortunately, Li4Ti5O12 has problems with the low electrical conductivity and lithium ion diffusivity. Here, we summarize the latest studies that incorporation of various dopants such as Na+, K+, Zr4+, W6+ and Br- doping in tetrahedral and octahedral site in Li4Ti5O12. The dopant cannot only change the lattice constant but also the morphology of the crystal. During the charge-discharge process, the stable reduction-oxidation of Ti is still observed. The results are analyzed by XRD (X-ray Diffraction) and XPS (X-ray photoelectron spectroscopy) and manifest the electrical conductivity and lithium ion diffusivity can be improved by doping various atoms.