Journal of the Korean Electrochemical Society (전기화학회지)

The Korean Electrochemical Society (한국전기화학회)
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Reduction of Li4Ti5O12 Powder Agglomeration by the Addition of Carbon Black during Solid-state Synthesis

고상법을 사용한 Li4Ti5O12의 합성공정 중 카본블랙 추가를 통한 입자뭉침 억제

  • Kim, Duri (Graduate School of Knowledge-Based Technology and Energy, Korea Polytechnic University) ;
  • Kang, Sang June (Graduate School of Knowledge-Based Technology and Energy, Korea Polytechnic University) ;
  • Hong, Min Young (Graduate School of Knowledge-Based Technology and Energy, Korea Polytechnic University) ;
  • Ryu, Ji Heon (Graduate School of Knowledge-Based Technology and Energy, Korea Polytechnic University)
  • 김두리 (한국산업기술대학교 지식기반기술.에너지대학원) ;
  • 강상준 (한국산업기술대학교 지식기반기술.에너지대학원) ;
  • 홍민영 (한국산업기술대학교 지식기반기술.에너지대학원) ;
  • 류지헌 (한국산업기술대학교 지식기반기술.에너지대학원)
  • Received : 2016.03.18
  • Accepted : 2016.03.18
  • Published : 2016.08.31
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Abstract

$Li_4Ti_5O_{12}$ is prepared through a solid-state reaction between anatase $TiO_2$ and $Li_2CO_3$ 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 $Li_4Ti_5O_{12}$ powder gradually decreases. Furthermore, the $Li_4Ti_5O_{12}$ powder prepared with 1.0 wt% of carbon black shows the highest sieved fraction at the powder classification by 325 mesh standard sieve. The $Li_4Ti_5O_{12}$ powders with various contents of carbon black are almost same at the rate capability for the negative electrode materials in lithium-ion batteries.

$Li_4Ti_5O_{12}$는 우수한 사이클 특성과 구조적 안정성을 지니고 있으며 급속충전 및 고출력 특성을 지닌 리튬이온 이차전지용 음극 활물질이다. 고상법을 통한 $Li_4Ti_5O_{12}$의 합성 중에 발생하는 입자간의 뭉침을 억제하기 위하여, 원료인 $TiO_2$와 $Li_2CO_3$에 카본블랙을 소량 첨가하여 합성을 진행하였다. 원재료 대비하여 카본블랙을 각각 0, 0.5, 1.0, 및 3.0 질량%로 추가하여 고상법으로 $Li_4Ti_5O_{12}$를 합성하였으며, 얻어진 각 분말의 탭밀도와 분급속도를 비교하였다. 카본블랙의 함량이 증가함에 따라 입자의 뭉침이 감소하여 탭밀도가 감소하였으며, 카본블랙을 1.0 질량% 사용한 경우에 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.

Keywords

References

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