期刊
JOURNAL OF POWER SOURCES
卷 248, 期 -, 页码 1191-1196出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2013.10.076
关键词
Spherical natural graphite; Anode; Binder; Polyacrylic acid; Thermal stability
资金
- National Research Foundation of Korea
- Korean government (MEST) [NRF-2009-C1AAA001-0093307]
- Energy Efficiency & Resources from the Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Korea Government's Ministry of Knowledge Economy [2011201010016B]
- Korea Evaluation Institute of Industrial Technology (KEIT) [2011201010016B] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The polymeric binder is seen to affect the thermal stability and deformation of spherical graphite used in lithium ion battery anodes. Spherical natural graphite anodes are prepared using three different binders: two aqueous-based binders, polyacrylic acid (PAA) and a mixture of carboxy-methyl cellulose and styrene butadiene rubber (abbreviated CMC/SBR), and an organic-based binder, polyvinylidene fluoride (PVDF). The thermal stability of fully lithiated electrodes is measured by differential scanning calorimetry (DSC). The PAA binder effectively suppresses heat evolution (43% (PVDF) and 23% (CMC/SBR) less heat) at low temperatures up to 200 degrees C during DSC scans of the lithiated electrodes, compared to the PVDF and CMC/SBR binders. In addition, the PAA binder allows the graphite electrode to maintain an appropriate porous structure (13% greater porosity than the PVDF and CMC/SBR electrodes) even at high electrode density after 6 kgf cm(-2) compression, thus leading to enhanced effective cycles (11% (PVDF) and 60% (CMC/SBR) greater capacity after 50 cycles). (C) 2013 Elsevier B.V. All rights reserved.
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