期刊
SOLID STATE IONICS
卷 295, 期 -, 页码 57-64出版社
ELSEVIER
DOI: 10.1016/j.ssi.2016.07.012
关键词
Fluoropolymers; PVDF-TrFE; C-LiFePO4; Lithium-ion battery
资金
- Portuguese Foundation for Science and Technology (FCT) [UID/ FIS/04650/2013, PTDC/CTM-ENE/5387/2014, PEST-C/ QUI/UI0686/2013]
- FCT [SFRH/BD/90313/2012, SFRH/BPD/112547/2015]
- Basque Government Industry Department under ELKARTEK Program
- Fundação para a Ciência e a Tecnologia [SFRH/BD/90313/2012] Funding Source: FCT
The polymer binder plays a relevant role in the performance of battery electrodes. This work proposes poly(vinylidene fluoride-co-trifluoroethylene), PVDF-TrFE, as a polymer binder for C-LiFePO4 based cathodes and investigates its effect in the electrochemical properties of the cathodes. Morphological, electrical, swelling and electrochemical properties were investigated for this polymer binder and the results were compared with the ones from two other fluoropolymers, poly(vinylidene fluoride), PVDF, and poly(vinylidene fluoride-co-hexafluoropropylene), PVDF-HFP, already reported in the literature as binders for C-LiFePO4 cathodes. It is demonstrated that cathode morphology and electrical conductivity are similar, independently of the polymer binders, but that the swelling values depend on the selected binder. The voltage difference between the two redox peaks of the C-LiFePO4 based cathodes with PVDF, PVDF-HFP or PVDF-TrFE as binders are 0.46, 0.79 and 0.83 V, respectively. Also, the impedance values show the following order: PVDF < PVDF-HFP PVDF-TrFE. Finally, the discharge capacities values are 129 mAh.g(-1), 75.5 mAh.g(-1) and 94.3 mAh.g(-1) for PVDF, PVDF-HFP and PVDF-TrFE binders after 50 cycles at C-rate. Thus, it is concluded that PVDF-TrFE binder shows good rate capability and cycle performance, being therefore adequate for the development of C-LiFePO4 cathodes in lithium-ion batteries. (C) 2016 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据