LiNiO2 electrode modified by plasma chemical vapor deposition for higher voltage performance

Surface modification of the electrode improved the performance of the LiNiO 2 electrode charged to 4.6 V. An amorphous carbon thin film was uniformly d eposited on the electrode surface using de plasma chemical vapor deposition . This surface treatment suppressed electrolyte decomposition during the-ch arge process. When a coin-type cell using this electrode was charged to 4.6 V, the charge-discharge efficiency was 84% in the first cycle and 96-98% t hrough the second to fifth cycles. This treatment suggests a new approach t o the development of the positive electrode for lithium-ion secondary batte ries. (C) 2001 Elsevier Science B.V. All rights reserved.