Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 2, Issue 32, Pages 12827-12834Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ta00434e
Keywords
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Funding
- Northeastern Center for Chemical Energy Storage, an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DESC001294]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-98CH10886, DE-AC02-06CH11357]
- EPSRC [EP/K000144/1, EP/K000136/1]
- ARCHER supercomputer through membership of the UK's HPC Materials Chemistry Consortium - EPSRC [EP/L000202]
- NYSERDA [17433, 18500]
- EPSRC [EP/K000136/1, EP/L000202/1, EP/K000144/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/K000136/1, EP/K000144/1, EP/L000202/1] Funding Source: researchfish
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1263004] Funding Source: National Science Foundation
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We have revealed the critical role of carbon coating in the stability and thermal behaviour of olivine MnPO4 obtained by chemical delithiation of LiMnPO4. (Li)MnPO4 samples with various particle sizes and carbon contents were studied.. Carbon-free LiMnPO4 obtained by solid state synthesis in O-2 becomes amorphous upon delithiation. Small amounts of carbon (0.3 wt%) help to stabilize the olivine structure, so that completely delithiated crystalline olivine MnPO4 can be obtained. Larger amount of carbon (2 wt%) prevents full delithiation. Heating in air, O-2, or N-2 results in structural disorder (<300 degrees C), formation of an intermediate sarcopside Mn-3(PO4)(2) phase (350-450 degrees C), and complete decomposition to Mn2P2O7 on extended heating at 400 degrees C. Carbon coating protects MnPO4 from reacting with environmental water, which is detrimental to its structural stability.
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