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Korean Chemical Engineering Research,
Vol.57, No.6, 832-840, 2019
Vol.57, No.6, 832-840, 2019
붕소가 도핑된 리튬이온전지용 양극 활물질(LiNi0.90Co0.05Ti0.05O2)의 전기화학적 특성
Electrochemical Properties of Boron-doped Cathode Materials (LiNi0.90Co0.05Ti0.05O2) for Lithium-ion Batteries
양극 활물질의 전기화학적 성능을 개선하기 위하여, 농도 구배형 전구체를 사용한 boron-doped LiNi0.90Co0.05Ti0.05O2를 합성하였다. 제조된 양극 활물질의 특성은 XRD, SEM, EDS, PSA, ICP-OES 및 전기전도도 측정을 통하여 분석하였다. 초기 충·방전 용량, 사이클, 순환전압전류, 율속 특성 및 임피던스 테스트를 통해 전기화학적 성능을 조사하였다. 붕소가 0.5 mol% 도핑된 LiNi0.90Co0.05Ti0.05O2 양극 활물질은 2.7~4.3 V (vs. Li/Li+)의 전압 범위에서 0.5 C의 전류를 인가했을 때, 187 mAh/g의 용량을 보이며 50 사이클 이후 94.7%의 용량 유지율을 보였다. 상대적으로 고전압인 2.7~4.5 V(vs. Li/Li+)의 전압 범위에서는 200 mAh/g의 높은 용량을 보이며 50 사이클 이후 80.5%의 용량 유지율을 나타냈다.
To improve the electrochemical performances of the cathode materials, boron-doped LiNi0.90Co0.05Ti0.05O2 were synthesized by using concentration gradient precursor. The characteristics of the prepared cathode materials were analyzed by XRD, SEM, EDS, PSA, ICP-OES and electrical conductivity measurement. The electrochemical performances were investigated by initial charge/discharge capacity, cycle stability, C-rate, cyclic voltammetry and electrochemical impedance spectroscopy. The cathode material with 0.5 mol% boron exhibited a capacity of 187 mAh/g (0.5 C) in a voltage range of 2.7~4.3 V(vs. Li/Li+), and an capacity retention of 94.7% after 50 cycles. In the relatively high voltage range of 2.7~4.5 V(vs. Li/Li+), it showed a high capacity of 200 mAh/g and capacity retention of 80.5% after 50 cycles.
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