Lithium-ion batteries have been considered the most important devices to power mobile or small-sized devices due to their high energy density. LixCoO2 has been studied as a cathode material for the Li-ion battery. However, the limitation of its capacity impedes the development of high capacity cathode materials with Ni, Mn, etc. in them. The substitution of Mn and Ni for Co leads to the formation of solid solution phase LiNixMnyCo1-x-yO2 (NMC, both x and y < 1), which shows better battery performance than unsubstituted LiCoO2. However, despite a high discharge capacity in the Ni-rich compound (Ni > 0.8 in the metal site), poor cycle retention capability still remains to be overcome. In this study, aiming to improve the stability of the physical and chemical bonding, we investigate the stabilization effect of Ca in the Ni-rich layered compound Li(Ni0.83Co0.12Mn0.05)O2, and then Ca is added to the modified secondary particles to lower the degree of cationic mixing of the final particles. For the optimization of the final grains added with Ca, the Ca content (x = 0, 2.5, 5.0, 10.0 at.%) versus Li is analyzed.

Abstract
 1. 서 론
 2. 실험 방법
 3. 결과 및 고찰
 4. 결 론
 Reference

• 강범희(충남대학교 신소재공학부) | Beomhee Kang (Department of Materials Science and Engineering, Chungnam National University)
• 홍순현(충남대학교 신소재공학부) | Soonhyun Hong (Department of Materials Science and Engineering, Chungnam National University)
• 윤홍관(충남대학교 신소재공학부) | Hongkwan Yoon (Department of Materials Science and Engineering, Chungnam National University)
• 김도진(충남대학교 신소재공학부) | Dojin Kim (Department of Materials Science and Engineering, Chungnam National University)
• 김천중(충남대학교 신소재공학부) | Chunjoong Kim (Department of Materials Science and Engineering, Chungnam National University) Corresponding author