고상법을 사용한 Li4Ti5O12의 합성공정 중카본블랙 추가를 통한 입자뭉침 억제
Reduction of Li4Ti5O12 Powder Agglomeration by the Addition of Carbon Black during Solid-state Synthesis
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초록
Li4Ti5O12는 우수한 사이클 특성과 구조적 안정성을 지니고 있으며 급속충전 및 고출력 특성을지닌 리튬이온 이차전지용 음극 활물질이다. 고상법을 통한 Li4Ti5O12의 합성 중에 발생하는 입자간의 뭉침을 억제하기 위하여, 원료인 TiO2와 Li2CO3에 카본블랙을 소량 첨가하여 합성을 진행하였다. 원재료 대비하여 카본블랙을 각각 0, 0.5, 1.0, 및 3.0 질량%로 추가하여 고상법으로Li4Ti5O12를 합성하였으며, 얻어진 각 분말의 탭밀도와 분급속도를 비교하였다. 카본블랙의 함량이증가함에 따라 입자의 뭉침이 감소하여 탭밀도가 감소하였으며, 카본블랙을 1.0 질량% 사용한경우에 가장 빠르게 분급이 진행되었다. 또한, 카본블랙의 사용량에 무관하게 전기화학적 속도특성에서는 차이가 발생하지 않았기 때문에 1.0 질량%의 카본블랙의 추가를 통하여 성능의 손실없이 분말의 제조속도를 높일 수 있다.
Abstract
Li4Ti5O12 is prepared through a solid-state reaction between anatase TiO2 and Li2CO3 for the negative electrode active materials in quick-charging lithium-ion batteries. The small amount of carbon black (0, 0.5, 1.0, and 3.0 wt%) is added for the reduction of powder agglomeration during heat-treatment. As the amount of the added carbon black increases, the tap density of Li4Ti5O12 powder gradually decreases. Furthermore, the Li4Ti5O12 powder prepared with 1.0 wt% of carbon black shows the highest sieved fraction at the powder classification by 325 mesh standard sieve. The Li4Ti5O12 powders with various contents of carbon black are almost same at the rate capability for the negative electrode materials in lithium-ion batteries.
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