리튬 이차전지용 양극활물질 Li [Ni0.6Co0.2Mn0.2]O2의 소성 온도가 전기화학적 특성에 미치는 영향
Effects of Calcinations Temperature on the Electrochemical Properties of Li[Ni0.6Co0.2Mn0.2]O2 Lithium-ion Cathode Materials
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초록
Na2CO3와 [M(SO4)(M = Ni, Co, Mn)]을 사용함으로써, Carbonate 공침 합성법에 의해 [Ni0.Co0.2Mn0.2]CO3 전구체를 합성하였다. 합성된 전구체는 공기분위기에서 Li2CO3와 혼합하여 각각, 750, 850 그리고 950oC에서 소성되었고, 이로 인한 Li[Ni0.6Co0.2Mn0.2]O2 양극활 물질의 소성온도가 미치는 영향을 조사하였다. Li[Ni0.6Co0.2Mn0.2]O2의 구조와 특성은 X-선 회절 분석(XRD), 시차주사현미경(SEM) 그리고 전기화학적 측정으로 분석되었는데, X-선 회절 결과 Li[Ni0.6Co0.2Mn0.2]O2 는 소성온도가 증가함에 따라서 I(003)/I(104)는 증가하고 R-factor 는 감소하였으며, 시차주사현미경 결과에서는 1차 입자의 크기가 증가하는 경향을 보였다. 특히, 950oC에서 24시간 동안 소성된 Li[Ni0.6Co0.2Mn0.2]O2는 가역 용량이 165.3 mAhg−1[cut-off voltage 2.5~4.3 V, 0.1 C(17 mAhg−1)] 그리고 50번째 충·방전 사이클 [cut-off voltage 2.5~4.3 V1 C(170 mAhg−1)]까지 95.4%의 우수한 용량 보존율을 가지면서 가장 우수한 전기화학적 특성을 보여주었다.
Abstract
Abstract : Using Na2CO3 and MeSO4 (Me = Ni, Co and Mn) as starting materials, the pre-cursor of [Ni0.6Co0.2Mn0.2]CO3 has been synthesized by carbonate co-precipitation. The precur-sor was mixed with Li2CO3, and calcined at 750, 850, and 950oC in air. Effect of calcinations temperature on characteristics of Li[Ni0.6Co0.2Mn0.2]O2 cathode materials was investigated. The structure and characteristics of Li[Ni0.6Co0.2Mn0.2]O2 were determined by X-ray diffraction(XRD), Scanning electron microscopy (SEM) and electrochemical measurements. The X-ray diffraction (XRD) results show that the intensity ratio of I(003)/I(104) increased and the R-factor ratio decreased with the increase of calcinations temperature. And Scanning electron microscopy (SEM) result show that the primary particle size increased. Especially, the Li[Ni0.6Co0.2Mn0.2]O2 calcined at 950oC for 24 H shows excellent electrochemical performances with reversible spe-cific capacity of 165.3 mAhg−1 [cut-off voltage 2.5~4.3 V, 0.1 C(17 mAhg−1)] and good capacity retention of 95.4% after 50th charge/discharge cycles[cut-off voltage 2.5~4.3 V, 1 C(170 mAhg−1)].
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