Abstract
Li2MnSiO4 has attracted significant attention as cathode material for lithium ion batteries due to its structural diversity, abundance, low cost, thermal stability, and high theoretical capacity (330 mAh g−1). However, it suffers from low electronic conductivity, poor cycling performance, and limited reversible capacity. To overcome these deficiencies, as well as to further enhance its thermal stability and rate capability, we discover that surface modification utilizes an ex-situ carbon coating method using sucrose as the carbon source. Our approach enabled a uniform coating of amorphous carbon on Li2MnSiO4 with a monoclinic crystalline structure, which was confirmed by X-ray diffraction, electron microscopy, and Raman studies. The influence of sucrose on the performance of carbon coating has been analyzed in the half-cell configuration employing 1.0 M LiPF6 in ethylene carbonate/diethyl carbonate (1:1 v/v) as an electrolyte. Hence, the impact on the controlled carbon coating significantly improves the cycle characteristics of redox peaks (Mn2+/Mn3+ and Mn3+/Mn4+) originally observed in the pristine monoclinic phase of Li2MnSiO4 within a potential range of 2.5–4.4 V vs. Li/Li+. A well-tuned carbon-coated product benefits from the optimum thickness results in achieving excellent thermal stability by protective action of carbon coating and rate capability retains ~ 92% of its initial capacity of 159 mAh g−1 after 200 cycles at a higher current rate 0.5 C.
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Acknowledgements
One of the authors (M.S.M) is indebted to the Naval Research Board (NRB), DRDO, New Delhi for the financial support (NRB/4003/PG/343), to carry out this work. The authors (K.S.K and M.S.M) would like to acknowledge the SSN management for providing the necessary infrastructure facilities. K.S.K acknowledges the Central Scientific Industrial Research for providing CSIR-SRF fellowship (File. No. 08/542(0014)/2020 EMR-I).
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Shree Kesavan, K., Michael, M.S. High rate capability and thermal stability of monoclinic-Li2MnSiO4 – A promising high capacity cathode material for lithium batteries. J Solid State Electrochem 26, 1431–1443 (2022). https://doi.org/10.1007/s10008-022-05180-4
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DOI: https://doi.org/10.1007/s10008-022-05180-4