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Structure and Electrochemical Properties of Boron-Doped LiCoO2

✍ Scribed by R. Alcántara; P. Lavela; J.L. Tirado; R. Stoyanova; E. Zhecheva

Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
557 KB
Volume
134
Category
Article
ISSN
0022-4596

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✦ Synopsis

XRD, 6

Li and 11 B MAS NMR, IR, and EPR of low-spin Ni 3؉ probes were used for the structural characterization of borondoped LiCoO 2 . Up to 5 atom % boron additives were shown to dissolve in trigonal LiCoO 2 . The structure of the CoO 2 sandwiches remained unaffected by this treatment. The boron environment was assessed by spectroscopic analysis, which showed a distorted tetrahedral coordination. The boron-doped LiCoO 2 samples were used as active electrode materials in lithium cells.

Step potential electrochemical spectroscopy and galvanostatic cycling revealed that boron dopants improve the reversibility of the lithium deintercalation-intercalation process and favor lattice adaptation to lithium order-disorder in the depleted LiO 2 layers.

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