Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 22, Issue 17, Pages 8228-8234Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2jm30403a
Keywords
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Funding
- MEST [WCU: R31-2008-000-20012-0, CRC: 2011K000637]
- MKE, Korea [R0000491, NIPA-2012-C1090-1200-0002]
- Korea Evaluation Institute of Industrial Technology (KEIT) [R0000491] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Ministry of Public Safety & Security (MPSS), Republic of Korea [H0301-12-1009] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2010-50181, R31-2012-000-20012-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The kinetically helpful hollow secondary structure of LiFePO4 olivine (LFP) was optimized by a balance between its impurities and shape. In a thermodynamic process using hydrothermal treatment (+HyT), a relatively small amount of hollow structure was developed without any impurities by a sequential precipitation method using the difference of the solubility products (K-sp) between two precipitates (Li3PO4 and Fe-3(PO4)(2)). On the other hand, a kinetically controlled process without hydrothermal treatment (-HyT) produced the opposite result of a greater amount of hollow structure with impurities (Li3PO4). By removing the LFP impurities from the latter process (-HyT*), therefore, optimized hollow LFP was obtained without impurities. The resultant cathode material showed enhanced capacities, especially at high rate discharges, due to the improved accessibility of ions into the primary particles of the hollow secondary structure of LFP.
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