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Sputter-Deposited Amorphous LiCuPO 4 Thin Film as Cathode Material for Li-ion Microbatteries

Abstract : We report the electrochemical performance of amorphous LiCuPO 4 thin films obtained by radio frequency sputtering as a cathode material for Li-ion microbatteries. The thin films were characterized by X-ray diffraction, scanning electron micro-scopy, profilometry and electrochemical techniques. Charge/ discharge profiles and cycling performance were evaluated in lithium electrochemical test cells. Cyclic voltammogram of the LiCuPO 4 film shows the typical redox reaction peak at~1.9 V vs. Li/Li +. A discharge capacity of 160 mAh g À1 (50 mAh cm À2) is attained for the first cycle at C/10 to reach a stable capacity of 70 mAh g À1 (22 mAh cm À2) with good stability over 160 cycles. For comparison, the electrochemical performance of a crystalline LiCuPO 4 film was investigated. The first discharge could deliver a high capacity of around 375 mAh g À1 at C/10, but the capacity decayed quickly to a low capacity of 11 mAh g À1 over 50 cycles. The results show that the LiCuPO 4 amorphous materials can be considered as the exciting cathode candidate for Li-ion microbatteries.
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Submitted on : Friday, June 5, 2020 - 3:58:09 PM
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Vinsensia Sugiawati, Florence Vacandio, Philippe Knauth, Thierry Djenizian. Sputter-Deposited Amorphous LiCuPO 4 Thin Film as Cathode Material for Li-ion Microbatteries. ChemistrySelect, Wiley, 2018, 3 (2), pp.405-409. ⟨10.1002/slct.201702429⟩. ⟨hal-02656702⟩

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