Journal
JOURNAL OF POWER SOURCES
Volume 226, Issue -, Pages 122-126Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2012.09.081
Keywords
Li-ion battery; Cathode; Olivine; Nano particle; EELS
Ask authors/readers for more resources
The LiMnPO4 cathode material is a good candidate for rechargeable lithium ion batteries because of high voltage (4.1 V), high thermal stability and no toxicity. However, the rate performance of this material is extremely low when compared to the conventional LiMO2 (M = Ni or Co) or LiFePO4. In this study, the primary particle size was reduced by a hydrothermal synthesis, and we obtained LiMnPO4 particles with sizes less than 40 nm. The sample exhibited an excellent rate capacity, which was 136 mAh g(-1) at 5 C and 120 mAh g(-1) at 10 C. We also revealed the effect of the LiMnPO4 particle size on the battery by introducing STEM-EELS, which was expected to allow for the direct microscopic observation of the lithium state in the particles during the charge-discharge process. With the EELS analysis, it was clarified that the lithium diffusion distance from the inside to the surface of the primary particles had to be reduced down to about 20 nm to achieve the high rate performance. Crown Copyright (C) 2012 Published by Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available