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Effect of sulfur doping on structural reversibility and cycling stability of a Li2MnSiO4 cathode material

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Abstract

Based on the existing calculation reports, sulfur doping is an effective approach to alleviate the structure collapse of Li2MnSiO4 during cycling. Herein, we investigate the feasibility and limitations of S doping in Li2MnSiO4 by experiment. In our work, the solid solubility of S is confirmed and exceeding the threshold results in MnS impurity. The existence state and site of the S element in a Li2MnSiO4 crystal structure is also confirmed. It is found that S doping significantly improves the structural reversibility and cycling stability. Compared with a pristine sample, a 1mol% S doped sample exhibits a much higher initial coulombic efficiency (88.3%), excellent capacity retention (98% at 10th cycles for instance) and enhanced rate performance. Moreover, the 1mol% S doped sample can retain a discharge capacity of 137 mA h g−1 after 30 cycles while the pristine sample only has 61.6 mA h g−1. This study confirms the effectivity of S doping in suppressing the structural distortion in Li2MnSiO4.

Graphical abstract: Effect of sulfur doping on structural reversibility and cycling stability of a Li2MnSiO4 cathode material

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Publication details

The article was received on 31 May 2018, accepted on 30 Jul 2018 and first published on 01 Aug 2018


Article type: Paper
DOI: 10.1039/C8DT02226G
Citation: Dalton Trans., 2018, Advance Article
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    Effect of sulfur doping on structural reversibility and cycling stability of a Li2MnSiO4 cathode material

    X. Wu, S. Zhao, L. Yu, J. Yang and C. Nan, Dalton Trans., 2018, Advance Article , DOI: 10.1039/C8DT02226G

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