二次鋰離子電池用之LiMn_2O_4材料合成及其特性分析

二次鋰離子電池的正極材料，在過去二十年裡有超過200種的材料被評估。其中以能量密度、環保及成本而言，錳氣化合物是最具發展潛力。幾種不同結構和不同化學計量比的錳氧化合物已被成功地研發出來。然而，在最近所提出之搖椅式鋰離子電池中，具尖晶石結構的LiMn_2O_4是最被看好。本文介紹LiMn_2O_4正極材料的合成、分析以及一些影響電池正極材料特性的原因。LiMn_2O_4系的材料與製程方面仍不斷地進步之中。而目前所遭遇的諸多LiMn_2O_4問題與瓶頸，都已逐一突破中，如以適切的過渡金屬離子取代可提高其循環電位與工作電壓，改善高溫(50-60˚C)的電池性能。相信此LiMn_2O_4正極材料電池，未來將可應用於行動電話、筆記型電腦與電動車上。

關鍵字

二次鋰離子電池；錳氧化合物；尖晶石結構

並列摘要

The materials used in positive electrodes of secondary lithium batteries have been studied a lot over the post two decades. Among these materials, manganese oxides were found to be the most promising, in terms of specific energy, toxicity, and cost. Several manganese oxides with different structures and stoichiometry, have been successfully developed. However, LiMn_2O_4 is the most promising candidate for the innovative lithium-ion (rocking chair) batteries proposed recently. In this paper, we demonstrate the synthesis and characterization of LiMn_2O_4. To improve their efficiency in maintaining electrochemical capacity over a large number of cycles without sacrificing initial reversible capacity as well as their performance at high temperatures, we evaluate LiMn_2O_4 spinels by replacing Mn with other metals. It is believed that the LiMn_2O_4 batteries will be applied on cellular telephones, notebook pes, and electrical vehicles (EV) in the future.

並列關鍵字

Lithium Batteries ； Manganese Oxides ； Spinel ； LiMn_2O_4

國際替代計量

二次鋰離子電池用之LiMn_2O_4材料合成及其特性分析

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