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J. Electrochem. Sci. Technol > Volume 4(3); 2013 > Article
Journal of Electrochemical Science and Technology 2013;4(3):113-118.
DOI: https://doi.org/10.5229/JECST.2013.4.3.113   
Electrochemical Characteristics of Nano-sized A2MnPO4F (A = Li, Na) as Cathode Materials for Lithium ion Batteries
Woosuk Cho, Jun Ho Song, Sang-Min Kim, Dong-Jin Kim, Min-Gu Kang, Jeom-Soo Kim, Young-Jun Kim
Advanced Batteries Research Center, Korea Electronics Technology Institute;Advanced Batteries Research Center, Korea Electronics Technology Institute;Advanced Batteries Research Center, Korea Electronics Technology Institute;Advanced Batteries Research Center, Korea Electronics Technology Institute;Advanced Batteries Research Center, Korea Electronics Technology Institute;Advanced Batteries Research Center, Korea Electronics Technology Institute;Advanced Batteries Research Center, Korea Electronics Technology Institute;
Abstract
Fluorophosphate, $Na_2MnPO_4F$ as new cathode material was synthesized by carbothermal treatment method. Prepared $Na_2MnPO_4F$ has particle size under 100 nm and residual carbon exists in surface of $Na_2MnPO_4F$. Additional carbon coating was performed in order to increase the electrochemical properties. Even capacity and overpotential were improved by carbon coating using mechanical ball milling, the reduced crystallinity limited the drastic improvement of the electrochemical properties. To solve this problem, re-heat treatment was involved to recover crystallinity and then notable improvement of electrochemical properties was obtained. Specific amount of $Li^+$ that participates in electrochemical $Li^+$ insertion / extraction reaction, was x = 1 in $Li_xNa_{2-x}MnPO_4F$ within the voltage range of 2.0 to 4.8 V. The doubled capacity by 2 electron reaction can be obtained when NMPF is charged to higher voltage over 4.8 V.
Key Words: $Na_2MnPO_4F$, Fluorophosphate, Cathode, Li ion batteries


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