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Thermal Behavior of Delithiated L i 1−x M n PO 4 (0 ≤ x <1) Structure for Lithium‐Ion Batteries
Author(s) -
Yoshida Jun,
Nakanishi Shinji,
Iba Hideki,
Abe Hiroya,
Naito Makio
Publication year - 2013
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.12121
Subject(s) - lithium (medication) , materials science , analytical chemistry (journal) , ion , phase (matter) , cathode , crystallography , chemistry , chromatography , medicine , organic chemistry , endocrinology
High‐voltage and high‐capacity cathode‐active materials are required to increase the energy density of rechargeable lithium‐ion batteries for hybrid vehicles. The olivine‐type L i M n P O 4 is considered as a good candidate for the next‐generation lithium‐ion battery due to its high voltage (4.1 V vs L i + / L i), low cost, and lower toxicity compared with the currently used layered materials. However, recent research has demonstrated that the thermal stability of delithiated phase of Li 1− x M n PO 4 (0 ≤ x <1) was less than that of Li 1− x FePO 4 . These reports verified that the delithiated M n PO 4 decomposed and changed into M n 2 P 2 O 7 with O 2 release at high temperature. In this study, we focused on the particle and crystal changes in L i M n P O 4 / M n PO 4 at high temperature on a nanoscale. As a result, we have succeeded to observe directly the particle and crystal changes using transmission electron microscope ( TEM ) with heating. It revealed that M n PO 4 was a thermally unstable phase because dendrites of M n 2 P 2 O 7 began to generate around 200°C.