新型 3.5V 级锂铁焦磷酸作为锂离子电池正极材料。

New lithium iron pyrophosphate as 3.5 V class cathode material for lithium ion battery.

机构信息

Department of Chemical System Engineering, School of Engineering, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.

出版信息

J Am Chem Soc. 2010 Oct 6;132(39):13596-7. doi: 10.1021/ja106297a.

DOI:10.1021/ja106297a

PMID:20831186

Abstract

A new pyrophosphate compound Li(2)FeP(2)O(7) was synthesized by a conventional solid-state reaction, and its crystal structure was determined. Its reversible electrode operation at ca. 3.5 V vs Li was identified with the capacity of a one-electron theoretical value of 110 mAh g(-1) even for ca. 1 μm particles without any special efforts such as nanosizing or carbon coating. Li(2)FeP(2)O(7) and its derivatives should provide a new platform for related lithium battery electrode research and could be potential competitors to commercial olivine LiFePO(4), which has been recognized as the most promising positive cathode for a lithium-ion battery system for large-scale applications, such as plug-in hybrid electric vehicles.

摘要

一种新的焦磷酸盐化合物 Li(2)FeP(2)O(7) 通过传统的固态反应合成，并确定了其晶体结构。即使对于约 1 μm 的颗粒，无需进行纳米化或碳涂层等特殊处理，其在约 3.5 V 相对于 Li 的可逆电极操作也被确定，具有 110 mAh g(-1) 的一个电子理论值的容量。Li(2)FeP(2)O(7)及其衍生物应该为相关锂电池电极研究提供一个新的平台，并且可能成为商业橄榄石 LiFePO(4)的潜在竞争者，LiFePO(4)已被认为是最有前途的锂离子电池系统的正极材料，适用于大规模应用，如插电式混合动力汽车。