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

Park, Yiseul; Park, Jung Soo; Baek, Seong‐Ho; Kim, Jae Hyun

doi:10.1016/j.jpowsour.2015.07.031

Journal of Power Sources

2015

DOI: 10.1016/j.jpowsour.2015.07.031

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

Yiseul Park

Jung Soo Park

Seong‐Ho Baek

et al.

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Cited by 10 publications

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References 26 publications

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“…For example, Endo et al reported the EB irradiation on carbon anodes and ascribed the performance improvement to the surface structure change of carbon and the degradation of PVDF binder by the EB irradiation. 18 EB irradiation of PVDF binders has also been reported for Li 4 Ti 5 O 12 electrode to achieve excellent high-rate performance by Park et al 19 EB irradiation was found to cause dehydrofluorination and cross-linking of PVDF, resulting in the formation of carbon-carbon double bonds.…”

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confidence: 86%

Electron Beam Curing of Composite Positive Electrode for Li-Ion Battery

Janke

et al. 2016

J. Electrochem. Soc.

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Electron beam cured acrylated polyurethanes have been successfully used as novel binders for positive electrodes for Li-ion batteries. The cross-linked polymer after electron beam curing coheres active materials and carbon black together onto Al foil. Electrochemical tests demonstrate the stability of the polymer at a potential window of 2.0 V–4.6 V. The electrode is found to have similar voltage profiles and charge-transfer resistance compared to the conventional electrode using polyvinylidene fluoride as the binder. When the electrode is tested in full Li-ion cells, they exhibit excellent cycling performance, indicating promising use for this new type of binder in commercial Li-ion batteries in the future.

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confidence: 86%

Electron Beam Curing of Composite Positive Electrode for Li-Ion Battery

Janke

et al. 2016

J. Electrochem. Soc.

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“…Electron beam irradiation also changes the surface structure of the carbon materials and modifies binder components from the electrode surface. 11,12 3 To the best of our knowledge, ultraviolet (UV) light treatment has not been used in battery applications although this technique is commonly used in carbon-fiber reinforced polymer industries. 13,14 The UV process could be inserted immediately following an electrode coating process to be compatible with roll-to-roll processing without a significant modification of other existing processes.…”

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Effects of Ultraviolet Light Treatment in Ambient Air on Lithium-Ion Battery Graphite and PVDF Binder

Daniel

et al. 2019

J. Electrochem. Soc.

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In our prior study, ultraviolet (UV) light was used for the first time to improve long-term cycling of lithium-ion battery (LIB) electrodes. It was found that UV treatment of the anode resulted in thinner solid electrolyte interphase (SEI) layers, higher capacity retentions, and lower charge transfer resistance after cycling. In this study, pristine graphite powders and polyvinylidene fluoride films (binder) with/without UV treatment were individually analyzed before cell assemblies. X-ray photoelectron spectroscopy (XPS) analysis showed a 300% increase in atomic percentage of oxygen on the graphite powder surfaces after UV treatment. However, fluorine level of the binder film decreased by more than 10%. The PVDF film also expanded in thickness by 3.7% after the UV treatment for 40 minutes, indicating scissions of the polymer backbones. The changes in PVDF weight, thickness, and fluorine atomic percentage from XPS peaks also indicated the release of fluorine containing gases (e.g., hydrogen fluoride and difluoroethylene gas) after crosslinking and scission of the PVDF. Although UV light was found to partially decompose PVDF in this study, it helped to increase oxygen level on the graphite, which, resulted in a thinner SEI layer, lower resistance, and eventually higher capacity retention as shown in our prior study.

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A Facile Surface Reconstruction Mechanism toward Better Electrochemical Performance of Li₄Ti₅O₁₂ in Lithium‐Ion Battery

et al. 2017

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Through a facile sodium sulfide (Na2S)‐assisted hydrothermal treatment, clean and nondefective surfaces are constructed on micrometer‐sized Li4Ti5O12 particles. The remarkable improvement of surface quality shows a higher first cycle Coulombic efficiency (≈95%), a significantly enhanced cycling performance, and a better rate capability in electrochemical measurements. A combined study of Raman spectroscopy and inductive coupled plasma emission spectroscopy reveals that the evolution of Li4Ti5O12 surface in a water‐based hydrothermal environment is a hydrolysis–recrystallization process, which can introduce a new phase of anatase‐TiO2. While, with a small amount of Na2S (0.004 mol L−1 at least), the spinel‐Li4Ti5O12 phase is maintained without a second phase. During this process, the alkaline environment created by Na2S and the surface adsorption of the sulfur‐containing group (HS− or S2−) can suppress the recrystallization of anatase‐TiO2 and renew the particle surfaces. This finding gives a better understanding of the surface–property relationship on Li4Ti5O12 and guidance on preparation and modification of electrode material other than coating or doping.

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

Cited by 10 publications

References 26 publications

Electron Beam Curing of Composite Positive Electrode for Li-Ion Battery

Electron Beam Curing of Composite Positive Electrode for Li-Ion Battery

Effects of Ultraviolet Light Treatment in Ambient Air on Lithium-Ion Battery Graphite and PVDF Binder

A Facile Surface Reconstruction Mechanism toward Better Electrochemical Performance of Li₄Ti₅O₁₂ in Lithium‐Ion Battery

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

Cited by 10 publications

References 26 publications

Electron Beam Curing of Composite Positive Electrode for Li-Ion Battery

Electron Beam Curing of Composite Positive Electrode for Li-Ion Battery

Effects of Ultraviolet Light Treatment in Ambient Air on Lithium-Ion Battery Graphite and PVDF Binder

A Facile Surface Reconstruction Mechanism toward Better Electrochemical Performance of Li4Ti5O12 in Lithium‐Ion Battery

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Product

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A Facile Surface Reconstruction Mechanism toward Better Electrochemical Performance of Li₄Ti₅O₁₂ in Lithium‐Ion Battery