Young's elastic modulus, hardness, and fracture toughness (KIc) of individual grains are reported for polycrystalline LiCoO2, a metal oxide cathode used in lithium-ion batteries, as measured via instrumented nanoindentation (indentations within circled locations; dashed line indicates grain boundary). The wide range of KIc does not correlate strongly with grain orientation.
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Qu et al. (2012) studied this question.
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