Synthesis of cathode material for sodium ion batteries using dry vibration milling

Two milling methods, dry vibration milling and wet ball milling, were used to prepare $Na_{2/3}(Ni_{1/3}Mn_{2/3})O_2$ powders as a cathode material for sodium ion batteries. The morphology and electrochemical property of the two powders with different milling processes were compared to each other. The particle size is less than $1{\mu}m$ in the dry vibration milled powder, while lots of larger particles than $1{\mu}m$ were found in the wet ball milled one. The single phase of $Na_{2/3}(Ni_{1/3}Mn_{2/3})O_2$ was obtained in the temperature range of $875{\sim}900^{\circ}C$. The discharge capacity and discharge voltage of the powder prepared by the dry process were higher than those of one prepared by the wet process.

건식 진동밀을 이용한 나트륨이온전지 양극활물질 합성

건식 진동밀과 습식 볼밀로 출발원료를 혼합/분쇄하여 나트륨이온전지용 양극활물질인 $Na_{2/3}(Ni_{1/3}Mn_{2/3})O_2$를 합성하여 특성을 비교하였다. 건식 진동밀로 혼합/분쇄한 분말은 습식 볼밀한 분말보다 더 미세한 $1{\mu}m$ 이하의 입자였으며, $875{\sim}900^{\circ}C$에서 열처리 하였을 때 단일상을 얻을 수 있었다. 또한 전지 특성도 건식 진동밀을 사용한 분말이 습식 공정으로 합성한 분말보다 방전용량이 크고 방전 전위도 높게 나왔다.