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Synthesis and Characteristics of LiNi 0.85 Co 0.15 O 2 Cathode Materials by Particulate Sol‐Gel Method for Lithium Ion Batteries
Author(s) -
XianJun Zhu,
HongHao Chen,
Hui Zhan,
HanXing Liu,
DaiLing Yang,
YunHong Zhou
Publication year - 2005
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.200590491
Subject(s) - chemistry , thermogravimetric analysis , lithium (medication) , scanning electron microscope , cathode , powder diffraction , sol gel , chemical engineering , differential thermal analysis , ion , analytical chemistry (journal) , diffraction , crystallography , organic chemistry , materials science , composite material , medicine , physics , optics , engineering , endocrinology
A particulate sol‐gel (PSG) method has been successfully used to prepare LiNi 0.85 Co 0.15 O 2 cathode materials, utilizing the reaction of LiOH·H 2 O with Ni(CH 3 COO) 2 ·4H 2 O and Co(CH 3 COO) 2 ·4H 2 O in water‐ethanol system. The thermal history of the as‐prepared xerogel was established by differential thermal analysis and thermogravimetric analysis. Powder X‐ray diffraction confirmed the formation of layered α‐NaFeO 2 structure at temperature of 700 °C under flowing oxygen. Scanning electron microscope exhibited that the crystalline powder prepared by PSG method had relatively smaller particle size with narrow distribution than the one prepared by solid state reaction. The first discharge capacity of the material by PSG method was 196.4 mAh/g, and the 10th discharge capacity was 189.1 mAh/g at the current density of 18 mA/g between 3.0 and 4.3 V. Its cycling reversibility was observed to be much better than that by solid state reaction, which had 187.3 mAh/g of the first discharge capacity and 167.1 mAh/g of the 10th discharge capacity.