Journal
DALTON TRANSACTIONS
Volume 47, Issue 35, Pages 12337-12344Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8dt02226g
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Funding
- National Natural Science Foundation of China [51372136]
- NSFC-Guangdong united fund [U1401246]
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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 10(th) 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.
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