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Electron beam modification of anode materials for high-rate lithium ion batteries

Title
Electron beam modification of anode materials for high-rate lithium ion batteries
Authors
Park, YiseulPark, Jung SooBaek, Seong-HoKim, Jae Hyun
DGIST Authors
Baek, Seong-HoKim, Jae Hyun
Issue Date
2015-11-20
Citation
Journal of Power Sources, 296, 109-116
Type
Article
Article Type
Article
Keywords
AnodesBall MillingCarbon-Carbon Double BondsElectric BatteriesElectric ConductivityElectrical ConductivityElectrodesElectron BeamElectron Beam IrradiationElectron Beam ModificationElectron BeamsElectronsHigh Rate CapabilityIonsIrradiationLithiumLithium-Ion BatteriesLithium AlloysLithium CompoundsLithium Ion BatteryLithium Titanium OxideOrganic PolymersPoly (Vinylidene Fluoride)(PVDF)Systematic ExperimentTitanium Oxides
ISSN
0378-7753
Abstract
The rate capability of a Li4Ti5O12 (LTO)-based anode in a lithium ion battery can be easily improved by electron beam (EB) irradiation without the need for complicated synthetic procedures. The electrode prepared with EB-irradiated LTO at a 50 kGy dose has an enhanced rate capability while retaining a discharge capacity of 100 mAh g-1, even at the 20 C-rate. The effect of EB irradiation on the properties of the anode materials (i.e., LTO, poly(vinylidene fluoride) (PVDF), super P carbon) is examined in detail through systematic experiments. Both LTO and PVDF are affected by EB irradiation and dependent on the exposed electron dose, but super P is affected negligibly. EB irradiation partially reduces LTO with forming Tix+ (2 < x < 4) which is attributed to the enhanced electrical conductivity. EB irradiation causes dehydrofluorination and cross-linking in PVDF, resulting in the formation of carbon-carbon double bonds. The conjugated structure of PVDF is formed by the further dehydrofluorination during mixing with LTO via ball-milling, and this is accelerated in the presence of EB-PVDF. This conjugated structure enhances the electrical conductivity and is responsible for the improved rate capability. © 2015 Elsevier B.V. All rights reserved.
URI
http://hdl.handle.net/20.500.11750/5157
DOI
10.1016/j.jpowsour.2015.07.031
Publisher
Elsevier B.V.
Related Researcher
Files:
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Collection:
Smart Textile Convergence Research Group1. Journal Articles


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