Polyvinyl alcohol grafted poly(acrylic acid) (PVA-g-PAA) was synthesized by graft polymerization of acrylic acid (AA) onto PVA through a free radical reaction. PVA-g-PAA and the cross-linking agent pentaerythritol (PER) together were used as an aqueous crosslinkble binder for LiFePO4 (LFP) cathode, the effect of crosslinking temperature and PER dosage on the electrochemical properties of LFP cathode were investigated. The crosslinking temperature was in good agreement with the temperature of the LFP cathode preparation process, and the crosslinking reaction was performed simultaneously during the drying process. When the PER dosage was 5mol% of PVA-g-PAA, the LFP electrode exhibited the optimum adhesion and electrochemical stability. The LFP electrode with PVA-g-PAA-c-5%PER binder was tested for charge and discharge cycles at 0.2 C and 1 C rates respectively, showing a capacity retention of 99.4% after 100 cycles at 0.2 C in comparison with 94.4% and 88.6% for PVA-g-PAA and PVDF, and maintaining 82.6% of initial capacity after 400 cycles at 1 C high rate as compare with 77.8% for PVA-g-PAA.
SU Jing
,
LIU Shu-ling
,
ZHANG Ling-zhi
. Preparation of Crosslinked Aqueous Binder for LiFePO4 Cathode in Lithium-Ion Batteries[J]. Advances in New and Renewable Energy, 2018
, 6(6)
: 498
-504
.
DOI: 10.3969/j.issn.2095-560X.2018.06.006
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