Effects of K in Mn₂O₃ on the Electrochemical Performances of Spinel Li_1.06Mn₂O₄

Abstract:

Spinel LiMn₂O₄ material is one of the lithium-ion battery cathodes. It is cheap, nontoxic, and safe in use. This cathode material, Li_1.06Mn₂O₄ was synthesized by using solid state reaction and two different starting materials. One was the Mn₂O₃ made from the industrial manganese carbonate with different contents of potassium, and the other was the high-purity Mn₂O₃ into which the same amount of potassium in the form of K₂CO₃ was added to form the K-doped spinel Li_1.06Mn₂O_4. These two kinds of LiMn₂O₄ materials were characterized by XRD, SEM and electrochemical performance analysis. The results showed that the initial discharge capacity of the former cathode materials decreased gradually and the cycle performance was improved with the amount of potassium increasing. The Li_1.06Mn₂O₄ with a content of 192.2 μg.g^-1 of potassium presented the optimized electrochemical performances, with an initial discharge capacity of 128.974mAh.g^-1, and a capacity retention rate of 89.90% after 50 cycles. The initial discharge capacity of doped Li_1.06Mn₂O₄ dropped rapidly with the doping amount increasing and the capacity retention rate was not as good as that of the Mn₂O₃ made from the industrial manganese carbonate with different contents of potassium.

• Periodical: Advanced Materials Research (Volume 773)
• Pages: 611-616
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.773.611
• Online since: September 2013
• Authors: Xing Zou, Chun Lin Peng
• Keywords: Cathode Material, Mn₂O₃, Potassium, Spinel Li_1.06Mn₂O₄

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