Preparation of LiCoPO4 and LiFePO4 coated LiCoPO4 materials with improved battery performance

Title
Preparation of LiCoPO4 and LiFePO4 coated LiCoPO4 materials with improved battery performance
Authors
In Chul JangH.H. LimS.B. LeeK. KarthikeyanV. Aravindan강기석윤원섭조원일이윤성
Keywords
LiCoPO4; LiFePO4; Surface coating; TEM; XRD; battery eprformance; Lithium cobalt phosphate; Lithium ion phosphate; Sol?el method; Solid-state reaction
Issue Date
2010-03
Publisher
Journal of alloys and compounds
Citation
VOL 497, 321-324
Abstract
Olivine LiCoPO4 material has been successfully synthesized by solid-state reaction method without any carbon coating. The X-ray diffraction pattern shows that LiCoPO4 has a well developed orthorhombic structure with Pnma space group. The SEM analysis shows the particulate nature of the prepared materials with <200 nm size. The TEM analysis confirms that a 2&#8211;3 nm thick LiFePO4 layer is coated onto LiCoPO4. The LiFePO4 coated LiCoPO4 cell delivers a high initial discharge capacity of 132mAhg&#8722;1, which is 19mAhg&#8722;1 higher than the parent LiCoPO4. Furthermore, the LiFePO4 coated LiCoPO4 cell exhibits an improved capacity retention compared to the original LiCoPO4 during cycling.
URI
http://pubs.kist.re.kr/handle/201004/41887
ISSN
0925-8388
Appears in Collections:
KIST Publication > Article
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