Carbon-coated clustered LiMn 0.71Fe 0.29PO 4 (c-LMFP) nanoparticles are prepared from ball-milling with a mixture of ∼40 nm thick LMFP nanoplates obtained by polyol method and carbon black. The clustered nanocomposite structure of c-LMFP turns out to have advantages of improved volumetric energy density and electrochemical performance. The c-LMFP exhibits increased tap density of 0.9 g cm -3, compared with the as-prepared LMFP nanoplates (0.6 g cm -3), providing with high volumetric discharge capacity of 243 mA h cm -3 at 0.1C and 128 mA h cm -3 even at 7C at 21 °C. At elevated temperature (60 °C), the capacity retention of c-LMFP remains excellent (100% of its initial capacity (165 mA h g -1) at the same cycling condition as 21 °C). In sharp contrast, capacity of carbon-coated LiMnPO 4 (c-LMP) exhibits volumetric discharge capacity of 72 mA h cm -3 at 5C and decays rapidly at 60 °C after 40 cycles (capacity retention of 58%). The better cycling stability of c-LMFP than that of c-LMP is believed to be associated with mitigated Mn 2+ dissolution by Fe 2+ substitution.
Bibliographical noteFunding Information:
This research was supported by the MKE (The Ministry of Knowledge Economy), Korea, under the ITRC (Information Technology Research Center) support program supervised by the NIPA(National IT Industry Promotion Agency)" (NIPA-2012-C1090-1200-0002).
All Science Journal Classification (ASJC) codes
- Renewable Energy, Sustainability and the Environment
- Energy Engineering and Power Technology
- Physical and Theoretical Chemistry
- Electrical and Electronic Engineering