Research On MT Secondary Coin Cell

The cathode materials, LiM₂O₄, LiNi₍0.01_Co_0.01Mn_1.98O₄ and LiNi₍0.01_Co_0.01Mn_1.98O₃.95F0.05 for lithium ion batteries were synthesized by sol-gel method. The synthesized materials were studied by power X-ray diffraction (XRD) and analytical scanning electron microscope (SEM). The as-prepared powders were used as positive materials for lithium-ion battery, whose discharge capacity and cycle voltammogram properties were examined. The results showed that LiNi₍0.01_Co_0.01Mn_1.98O₃.95F0.05 synthesized by sol-gel method had higher initial capacity than LiNi₍0.01_Co_0.01Mn_1.98O₄ and better cyclic performance than that of LiNi₍0.01_Co_0.01Mn_1.98O₄ and LiM₂O₄, which revealed that cation and anion dual-doped LiM₂O₄ could gain better electrochemical properties of LiM₂O₄ than only the cation-doped LiM₂O₄.LiNi₍0.01_Co_0.01Mn_1.98O₄ materials were prepared by two different methods: starch-assisted combustion, and traditional solid-state reaction. The product characteristics such as phase composition, particle morphology and size of as-prepared materials were examined with powder X-ray diffraction (XRD), the Brunauer-Emmett-Teller(BET) surface area method, particle size analysis and analytical scanning electron microscope (SEM), respectively. Both materials exhibited pure spinel structure. The SAC method provided better control of the morphology, particle size and distribution of the active material. The as-prepared powders were used as positive materials for lithium-ion battery, whose discharge capacity and cycle voltammogram properties were examined. The results showed that the material synthesized by SAC method had high initial specific capacity of 121.2 mAh·g^-1 and only 3.5% loss of the capacity after 100 cycles at a rate of 0.1C, when the initial specific capacity was 103.5 mAh·g^-1 at a discharge rate of 5C. The single-step process of SAC method is time and cost saving, and thus is promising for commercial application.In this paper, we researched lithium ion coin cells that employ the LiNi₍0.01_Co_0.01Mn_1.98O₄ spinel phase as the positive electrode and the Li₄Ti₅O₁₂ spinel phase as the negative electrode.