Structural and electrochemical characteristics of Li0.7[Li1/6Mn5/6]O2 synthesized using sol-gel method |
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Authors: | Ki Soo Park Myung Hun Cho Sung Jang Jin Chi Hoon Song Kee Suk Nahm |
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Affiliation: | (1) School of Chemical Engineering and Technology, College of Engineering, Chonbuk National University, 561-756 Chonju, Korea |
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Abstract: | Layered O2-lithium manganese oxide (O2-Li0.7Li1/6Mn5/6]O2) was prepared by ion-exchange of P2-sodium manganese oxide (P2-Na0.7Li1/6Mn5/6]O2)· P2-Na0.7Li1/6Mn5/6]O2 precursor was first synthesized by using a sol-gel method, and then O2-Li0.7Li1/6Mn5/6]O2 was produced by an ion exchange of Li for Na in the P2-Na0.7Li1/6Mn5/6]O2 precursor. Structural and electrochemical analyses suggested that good quality O2-Li0.7Li1/6Mn5/6]O2 was prepared from P2-Na0.7Li1/6Mn5/6]O2 synthesized at 800 °C for 10 h using glycolic acid as a chelating agent. During the cycle, the discharge profile of the synthesized
samples showed two plateaus at around 4 and 3 V, respectively, with a steep slope between the two plateaus. The discharge
curve at 3 V escalated with an increase in the cycle number, presenting a phase transition from a layered to a spinel like
structure. The sample prepared at 800 ‡C for 10 h using glycolic acid delivered a discharge capacity of 187 mAh/g with small
capacity fading. |
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Keywords: | Sol-Gel Method Chelating Agent Glycolic Acid Adipic Acid Layered Structure Lithium-ion Battery |
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