분무열분해 공정에 의해 합성된 LiNiO2 분말의 특성
Properties of LiNiO2 Powders Prepared by Spray Pyrolysis Process
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구연산과 에틸렌 글리콜이 함유된 분무용액으로부터 분무열분해 공정에 의해 미세한 LiNiO2 분 말들을 합성하였다. 마이크론 크기를 가지는 구형 형상 및 다공성의 전구체 분말들은 800oC에서 의 후열처리 후에 마이크론 크기 및 균일한 형태를 가지는 LiNiO2 분말로 전환되었다. 분무용 액에 첨가된 구연산 및 에틸렌 글리콜의 농도가 0에서 1 M 까지 증가할 때 LiNiO2 분말들의 초기 방전 용량은 199 mAh/g 에서 171 mAh/g 까지 감소하였다. 구연산과 에틸렌 글리콜을 함 유한 분무용액으로부터 합성된 LiNiO2 분말은 리튬의 첨가량이 양론비보다 6 mol% 과량일 때 198 mAh/g의 최대 초기 방전 용량을 가졌다. 미세한 LiNiO2 분말은 0.1 C 의 전류 밀도하에 서 30회 충방전 후에 방전 용량이 198 mAh/g 에서 163 mAh/g 으로 감소하였다
Abstract
LiNiO2 cathode powders with fine size have been synthesized by spray pyrolysis from the spray solution with citric acid and ethylene glycol. The as-prepared powders with spherical shape, porous structure and micron size turned into LiNiO2 powders with micron size and regular morphology after post-treatment at 800oC. The initial discharge capacities of the LiNiO2 powders changed from 199 to 171mAh/g when the concentrations of the citric acid and ethylene glycol added to the spray solutions were changed from 0 to 1M. The maximum initial discharge capacity of the LiNiO2 powders obtained from the spray solution with citric acid and ethylene glycol was 198 mAh/g when the lithium component added to the spray solution was 6 mol% excess of the stoichiometric amount. The discharge capacities of the fine-sized LiNiO2 powders dropped from 198 to 163 mAh/g by the 30 th cycle at a current density of 0.1 C
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