Open AccessIn situ XAFS study on cathodic materials for lithium‐ion batteries
Author(s) -
aka Takamasa,
Okuda Chikaaki,
Ukyo Yoshio,
Okamoto Tokuhiko
Publication year - 2001
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s0909049500017076
Subject(s) - x ray absorption fine structure , extended x ray absorption fine structure , octahedron , electrochemistry , lithium (medication) , in situ , ion , materials science , absorption (acoustics) , enhanced data rates for gsm evolution , cathodic protection , x ray absorption spectroscopy , absorption spectroscopy , range (aeronautics) , analytical chemistry (journal) , electrode , chemistry , optics , spectroscopy , physics , telecommunications , composite material , computer science , medicine , organic chemistry , quantum mechanics , chromatography , endocrinology
Ni and Co K‐edge X‐ray absorption spectra of LiNi 0.8 Co 0.2 O 2 have been collected using in situ coin cells. To investigate the electronic and structural changes accompanied by the capacity fading during electrochemical cycling and keeping batteries at high temperatures, the cells with different cycling states and keeping conditions (temperature, time) were prepared. Upon charging the cell, the Ni and Co K absorption edge shifted towards higher energy, and the good correlation between the range of chemical shifts upon charging and the capacity of the cell was observed. From quantitative analysis of EXAFS data, it was revealed that the capacity fading is closely related to the Jahn‐Teller distortion of the NiO 6 octahedron.