Premium
Synthesis and electrochemical characterization of gradient composite LiNi 1−y Co y O 2 used as cathode materials in lithium‐ion battery
Author(s) -
Zhao YuJuan,
Xia DingGuo,
Liu QingGuo
Publication year - 2004
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.20040221018
Subject(s) - cobalt , composite number , chemistry , electrochemistry , lithium (medication) , cathode , battery (electricity) , lithium ion battery , chemical engineering , ion , sintering , cobalt oxide , composite material , inorganic chemistry , electrode , materials science , organic chemistry , medicine , power (physics) , physics , quantum mechanics , engineering , endocrinology
Gradient composites, LiNi 1−y Co y O 2 , are synthesized from coated spherical Ni(OH) 2 precursor. These composites could be applied as new cathode materials in lithium‐ion batteries because they have low cobalt content (y≤0.2) and exhibit excellent properties during high‐rate charge/discharge cycles. The initial discharge capacity of coated composite of LiNi 0.95 O 2 is 186 mAh/g, and the decreasing rate of the capacity is 3.2% in 50 cycles at 1 C rate. It has been verified by TEM and EDX experiments that a core‐shell structure of the composite particles develops because of the cobalt enrichment near the surfaces, and the formation of the cobalt enrichment layer is sensitive to sintering tempera‐. High cobalt surface concentration may reduce the undesired reactions and stabilize the structure of the particles.