Structural and Electrochemical Characteristics of Li0.7[Li1/6Mn5/6]O2 Synthesized using Sol-Gel Method

• Published in: The Korean journal of chemical engineering pp. 46 - 51
• Main Authors: 남기석, Ki Soo Park, Myung Hun Cho, Sung Jang Jin, Chi Hoon Song
• Format: Journal Article
• Language: Korean
• Published: 한국화학공학회 01.01.2005
• Subjects: 화학공학
• ISSN: 0256-1115; 1975-7220

Layered O2-lithium manganese oxide (O2-Li0.7[Li1/6Mn5/6]O2) was prepared by ion-exchange of P2-sodiummanganese oxide (P2-Na0.7[Li1/6Mn5/6]O2). P2-Na0.7[Li1/6Mn5/6]O2 precursor was first synthesized by using a sol-gel meth-od, and then O2- Li0.7[Li1/6Mn5/6]O2 was produced by an ion exchange of Li for Na in the P2-Na0.7[Li1/6Mn5/6]O2 pre-cursor. Structural and electrochemical analyses suggested that good quality O2-Li0.7[Li1/6Mn5/6]O2 was prepared fromP2-Na0.7[Li1/6Mn5/6]O2 synthesized at 800oC for 10 h using glycolic acid as a chelating agent. During the cycle, the dis-charge profile of the synthesized samples showed two plateaus at around 4 and 3 V, respectively, with a steep slopebetween the two plateaus. The discharge curve at 3 V escalated with an increase in the cycle number, presenting a phasetransition from a layered to a spinel like structure. The sample prepared at 800oC for 10 h using glycolic acid delivereda discharge capacity of 187 mAh/g with small capacity fading. KCI Citation Count: 2