Abstract
XRD,6Li and11B MAS NMR, IR, and EPR of low-spin Ni3+probes were used for the structural characterization of boron-doped LiCoO2. Up to 5 atom % boron additives were shown to dissolve in trigonal LiCoO2. The structure of the CoO2sandwiches remained unaffected by this treatment. The boron environment was assessed by spectroscopic analysis, which showed a distorted tetrahedral coordination. The boron-doped LiCoO2samples 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 LiO2layers.
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