Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 2, Issue 44, Pages 18831-18837Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ta03994g
Keywords
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Funding
- Advance Technology Materials Co.
- Ltd Innovation Foundation [2011JA01GYF, 2011JA02GYF, 2013JA02PYF]
- China Iron & Steel Research Institute Group Foundation [SHI11AT0540A]
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Composite LiFe0.4Mn0.6PO4/C microspheres are considered advanced cathode materials for electric vehicles and other high-energy density applications due to their advantages of high energy density and excellent cycling stability. LiFe0.4Mn0.6PO4/C microspheres have been produced using a double carbon coating process employing traditional industrial techniques (ball milling, spray-drying and annealing). The obtained LiFe0.4Mn0.6PO4 microspheres exhibit a high discharge capacity of around 166 mA h g(-1) at 0.1 C and excellent rate capabilities of 132, 103, and 72 mA h g(-1) at 5, 10, and 20 C, respectively. A reversible capacity of about 152 mA h g(-1) after 500 cycles at a current density of 1 C indicates an outstanding cycling stability. The excellent electrochemical performance is attributed to the micrometer-sized spheres of double carbon-coated LiFe0.4Mn0.6PO4 nanoparticles with improved electric conductivity and higher Li ion diffusion coefficients, ensuring full redox reactions of all nanoparticles. The results show that the advanced high-energy density cathode materials can be produced using existing industry techniques.
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