Clean Technology, Vol.20, No.4, 433-438, December, 2014
Ru를 첨가한 음극활물질 Li4Ti5O12의 전기화학적 특성
Electrochemical Characteristics of Ru Added Li4Ti5O12 as an Anode Material
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초록
전기자동차와 하이브리드 전기자동차에 요구되는 높은 충.방전 속도, 안전성, 대형화에 적합한 충.방전 전지의 개발은 많은 관심을 받고 있다. 스피넬 구조의 Li4Ti5O12는 리튬이온이차전지의 음극활물질로 충.방전 시 부피변화가 거의 없기 때문에 수명특성이 뛰어나고, 전해액이 분해되는 전위보다 높은 작동 전압을 갖기 때문에 안정한 장점이 있다. 본 실험에서는 Li4Ti5O12의 단점인 전기전도성을 향상시키고자 소량의 Ru를 첨가하여 Li4Ti5O12를 고상법으로 제조하여 테스트하였다. TGA-DTA, XRD, SEM, 충.방전 테스트를 통해 분석을 실시하였다. Ru를 첨가하였을 때 용량은 약간 감소하였지만, 분극 현상이 감소하는 것을 확인하였다. 그리고 Ru를 3%와 4% 첨가하였을 때 높은 전류밀도인 10 C-rate 충.방전에서 용량감소율이 줄었다.
There is an increasing interest in the development of rechargeable batteries suitable for use in both hybrid electric vehicles and energy storage systems that require higher charge & discharge rates, bigger battery sizes and increased safety of the batteries. Spinel-type lithium titanium oxide (Li4Ti5O12) as a potential anode for lithium ion batteries has many advantages. It is a
zero-strain materials and it experiences no structural change during the charge/discharge precess. Thus, it has long cycle life due to its structural integrity. It also offers a stable operation voltage of approximately 1.55 V versus Li+/Li, above the reduction potential of most organic electrolyte. In this study, Ru added Li4Ti5O12 composites were synthesized by solid state process. The characteristics of active material were investigated with TGA-DTA, XRD, SEM and charge/discharge test. The capacity was reduced when Ru was added, however, the polarization decreased. The capacity rate of Li4Ti5O12 with Ru (3%, 4%) addition was reduced during the charge/discharge precess with 10 C-rate as a high current density.
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