Multi-wall carbon nanotube-embedded lithium cobalt phosphate composites with reduced resistance for high-voltage lithium-ion batteries

Title
Multi-wall carbon nanotube-embedded lithium cobalt phosphate composites with reduced resistance for high-voltage lithium-ion batteries
Authors
천동원Tae Kyoung KimCyrus S. RustomjiHyung-Man ChoJae-Young JungElizabeth CaldwellYoungjin KimJun Hyun HanSungho Jin
Keywords
lithium cobalt phosphate; carbon nanotube; embedded structure; nano-composite; charge transfer resistance; lithium-ion battery
Issue Date
2016-01
Publisher
Electronic materials letters
Citation
VOL 12, NO 1-155
Abstract
Lithium cobalt phosphate (LCP) is a high-voltage cathode material used in high-energy-density lithium-ion batteries. With a novel composite synthesis method, multi-wall carbon nanotube (MWCNT)-embedded LCP nanocomposites (LCP-CNT composites) are synthesized to enhance the electrical conductance of LCP particles, reducing charge-transfer resistance. The LCP-CNT composites with enhanced electrical conductance approximately doubled cell capacity compared to a cell with a bare LCP cathode. The crystal structure of LCP-CNT composite particles is characterized by X-ray diffraction; the microstructures of the embedded MWCNTs inside LCP particles are confirmed by transmission and scanning electron microscopy with focused ion beam procedures. Electrochemical impedance spectroscopy shows the charge-transfer resistance of the cell with the LCP-CNT composite (1.0 wt. % CNT) cathode decreases to similar to 80 Omega, much smaller than the similar to 150 Omega charge-transfer resistance of the bare-LCP cathode cell. Based on battery test and impedance analysis, the main factors affecting the capacity increment are the reduced charge transfer resistance and the uniform distribution of MWCNTs, which is formed during the gelation step of the LCP synthesis procedure.
URI
http://pubs.kist.re.kr/handle/201004/67315
ISSN
1738-8090
Appears in Collections:
KIST Publication > Article
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