Thin film graphite electrodes with low stress generation during Li-intercalation

Abstract We report here the development of thin film ‘graphite’ electrodes for Li-ion batteries, with near theoretical Li-intercalation/de-intercalation capacity (∼372 mAh/g). These films, synthesized by chemical vapor deposition at a relatively low temperature of 1000 °C, exhibit strong graphitic order with the basal planes oriented parallel to the Ni current collector. During galvanostatic cycling, in-situ stress measurements show that full lithiation corresponds to the development of only modest in-plane compressive stresses of ∼ −250 MPa. These stresses are more than an order of magnitude lower than expected, which should promote long cycle life.

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