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The effects of Ni and Li doping on the performance of lithium manganese oxide material for lithium secondary batteries |
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| Authors: | Ki Soo ParkMyung Hun Cho Sang Ho ParkKee Suk Nahm Yang Kook SunYun Sung Lee Masaki Yoshio |
| Affiliation: | a School of Chemical Engineering and Technology, College of Engineering, Chonbuk National University, Chonju 561-756, South Korea b Department of Industrial Chemistry, College of Engineering, Hanyang University, Seoul 133-791, South Korea c Department of Applied Chemistry, Saga University, 1 Honjo, Saga 840-8502, Japan |
| Abstract: | Layered Li0.7M1/6Mn5/6]O2 (M=Li, Ni) was synthesized using a sol-gel method. P2-Na0.7M1/6Mn5/6]O2 precursor was first synthesized by a sol-gel method, and then O2-Li0.7M1/6Mn5/6]O2 was prepared by an ion exchange of Li for Na in P2-Na0.7M1/6Mn5/6]O2 precursor. From charge/discharge curves, it was seen that Li0.7Li1/6Mn5/6]O2 has two plateaus similar to those observed from a spinel structure, but Li0.7Ni1/6Mn5/6]O2 holds a single plateau as observed from a typical layered structure. It was considered that Li0.7Li1/6Mn5/6]O2 undergoes a phase transformation from layered to spinel structure during the charge/discharge cycle, but Li0.7Ni1/6Mn5/6]O2 maintains O2-layered structure after the cycles. Li0.7Ni1/6Mn5/6]O2 was higher in discharge capacity and retention rate than Li0.7Li1/6Mn5/6]O2. |
| Keywords: | Sol-gel method Ni doping Glycolic acid Layered structure Lithium-ion battery |
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