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

Vinsensia Ade Sugiawati (1) , Florence Vacandio (2) , Philippe Knauth (2) , Thierry Djenizian (3)

1 Mines Saint-Etienne, Center of Microelectronics in Provence, Department of Flexible Electronics, 13541 Gardanne
2 MADIREL - Matériaux divisés, interfaces, réactivité, électrochimie
3 FEL-ENSMSE - Département d’Électronique Flexible

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.

Domains: Chemical Sciences; Material chemistry

Vinsensia Ade Sugiawati, Florence Vacandio, Philippe Knauth, Thierry Djenizian. Sputter-Deposited Amorphous LiCuPO 4 Thin Film as Cathode Material for Li-ion Microbatteries. ChemistrySelect, 2018, 3 (2), pp.405-409. ⟨10.1002/slct.201702429⟩. ⟨hal-02656702⟩