Journal
INORGANIC CHEMISTRY
Volume 56, Issue 21, Pages 13411-13416Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.inorgchem.7b02150
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Funding
- National Materials Genome Project [2016YFB0700600]
- Guangdong Innovation Team Project [2013N080]
- Shenzhen Science and Technology Research Grant (peacock plan) [KYPT20141016105435850, JCYJ20150729111733470, JCYJ20151015162256516]
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In this work, MgxFePO4 is exploited as a cathode material for rechargeable Mg-ion batteries. FePO4/C prepared via electrochemical delithiation of LiFePO4/C is directly used as the cathode in aqueous Mg2+ electrolyte, and reversible capacity is achieved for the first time. Notably, the capacity (82 mA h/g) is half of the theoretical value (164 mA h/g) and asymmetric discharge/charge behavior can be observed. In addition, first principles calculations show it is the strong Mg-ion interactions between adjacent channels that not only limit the capacity of the cathode but also lead to the difference in rates for Mg-ion intercalation and deintercalation. This work provides experimental and theoretical evidence that reveal the mechanism of Mg-ion intercalation and deintercalation in a FePO4 host, which gives guidance in designing cathode materials for rechargeable batteries based on multivalent metal ions.
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