固溶体
材料科学
相图
混溶性
电化学
热力学
离子
锂(药物)
固态
相(物质)
化学工程
纳米技术
电极
工程物理
物理化学
聚合物
复合材料
冶金
物理
工程类
内分泌学
医学
量子力学
有机化学
化学
作者
Genki Kobayashi,Shin Ichi Nishimura,Min Park,Ryoji Kanno,Masatomo Yashima,Takashi Ida,Atsuo Yamada
标识
DOI:10.1002/adfm.200801522
摘要
Abstract State‐of‐the‐art LiFePO 4 technology has now opened the door for lithium ion batteries to take their place in large‐scale applications such as plug‐in hybrid vehicles. A high level of safety, significant cost reduction, and huge power generation are on the verge of being guaranteed for the most advanced energy storage system. The room‐temperature phase diagram is essential to understand the facile electrode reaction of Li x FePO 4 (0 < x < 1), but it has not been fully understood. Here, intermediate solid solution phases close to x = 0 and x = 1 have been isolated at room temperature. Size‐dependent modification of the phase diagram, as well as the systematic variation of lattice parameters inside the solid‐solution compositional domain closely related to the electrochemical redox potential, are demonstrated. These experimental results reveal that the excess capacity that has been observed above and below the two‐phase equilibrium potential is largely due to the bulk solid solution, and thus support the size‐dependent miscibility gap model.
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