Cycling performance of a lithium-ion polymer cell assembled by in-situ chemical cross-linking with fluorinated phosphorous-based cross-linking agent

Choi, Jungwook; Kang, Yongku; Shim, Hyojin; Kim, Dong Wook; Cha, Eun-Hee; Kim, Dong-Won

doi:10.1016/j.jpowsour.2009.11.065

Cited by 35 publications

(21 citation statements)

References 17 publications

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“…Among the aforementioned methods, in situ polymerization can provide an effective approach to achieve the targeting electrolytes and batteries in one step, which effectively improves production efficiency. To fabricate crosslinked GPE, precursor solutions composing of liquid electrolytes, initiators and monomers with low molecular weight are treated by methods such as thermal initiation [38,39], UV-crosslinking [40,41] and g-ray irradiation [42] to achieve free radical polymerization. In the GPE system, host polymers provide dimensional stability, and liquid electrolytes trapped in the polymer framework contribute to the ionic conduction.…”

Section: Introductionmentioning

confidence: 99%

Effect of polyacrylonitrile on triethylene glycol diacetate-2-propenoic acid butyl ester gel polymer electrolytes with interpenetrating crosslinked network for flexible lithium ion batteries

Wang

Song

Fan

et al. 2015

Journal of Power Sources

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Section: Introductionmentioning

confidence: 99%

Effect of polyacrylonitrile on triethylene glycol diacetate-2-propenoic acid butyl ester gel polymer electrolytes with interpenetrating crosslinked network for flexible lithium ion batteries

Wang

Song

Fan

et al. 2015

Journal of Power Sources

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“…The UV‐polymerizable trivalent/monovalent acrylate mixture employed in the present study was composed of ethoxylated trimethylolpropane triacrylate (ETPTA) and ethylene glycol methyl ether acrylate (EGMEA) oligomers. The acrylate mixtures were chosen by considering the findings of previous studies,17–22 which indicated that polymers containing a high crosslinking density tend to endow a GPE with a strong rigidity and dimensional stability, whereas a linear polymer with flexible backbone chains may bring about mechanical softness and benign contact with electrodes. The ETPTA, featured with trivalent vinyl groups, is a photocrosslinkable monomer and the resulting polymer can offer a high mechanical strength 18–20.…”

Section: Introductionmentioning

confidence: 99%

“…The acrylate mixtures were chosen by considering the findings of previous studies,17–22 which indicated that polymers containing a high crosslinking density tend to endow a GPE with a strong rigidity and dimensional stability, whereas a linear polymer with flexible backbone chains may bring about mechanical softness and benign contact with electrodes. The ETPTA, featured with trivalent vinyl groups, is a photocrosslinkable monomer and the resulting polymer can offer a high mechanical strength 18–20. Meanwhile, the EGMEA, bearing monovalent vinyl groups, is also UV‐polymerizable, leading to a linear polymer with a high flexibility due to the presence of the oligo(ethylene oxide) units 21, 22.…”

Section: Introductionmentioning

confidence: 99%

A Facile Approach to Fabricate Self‐Standing Gel‐Polymer Electrolytes for Flexible Lithium‐Ion Batteries by Exploitation of UV‐Cured Trivalent/Monovalent Acrylate Polymer Matrices

Kil

Lee

2011

Macro Chemistry & Physics

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A facile approach to fabricate a self-standing GPE for fl exible lithium-ion batteries is demonstrated using a UV-cured trivalent/monovalent acrylate polymer matrix and a liquid electrolyte. The polymer matrix is successfully synthesized with the co-presence of the liquid electrolyte by UV polymerization of ETPTA, which has trivalent vinyl groups, and EGMEA, which contains monovalent vinyl groups, with the ETPTA/EGMEA ratio fi xed at 90/10 (wt%/wt%). The ETPTA/EGMEA matrix shows a lower T g than the ETPTA matrix alone, which helps improve the mechanical fl exibility and ionic transport of the resulting GPE. These features of the ETPTA/EGMEA-based GPE, together with its superior interfacial compatibility towards electrodes, play crucial roles in obtaining a better cell performance compared to the ETPTA-based GPE. 0 4 8 1 2 1 6 0 20 40 60 80 100 120 140 160 Capacity (mAh g -1 ) Cycle number E-GPE M-GPE (E-GPE) σ = 1.30 S cm -1 (M-GPE) σ = 1.66 S cm -1properties is diffi cult to avoid. In addition, liquid electrolytes also tend to provoke undesired interfacial reactions of the GPEs with the electrodes during cell operation. [10][11][12] This may induce vigorous proliferation of a resistive layer on the electrodes, which hinders ionic transport at the interface of the GPE and liquid electrolyte. These drawbacks of GPEs pose a formidable challenge in their successful application to lithium-ion batteries. Hence, the realization of advanced GPEs with well-tuned mechanical/electrochemical properties is urgently needed.To this end, we have developed a new, self-standing GPE for a design-fl exible lithium-ion battery by exploiting a UV-cured trivalent/monovalent acrylate polymer matrix and a liquid electrolyte (1 M LiPF 6 in ethylene carbonate (EC)/diethyl carbonate (DEC) = 1/1 v/v). The UV irradiation of vinyl monomers is a well-established, free-radical photopolymerization technique. UV polymerization can be conducted without the use of a solvent and requires a very short exposure time of less than a few minutes, thereby providing a facile and effective synthesis route for the preparation of polymers. [13][14][15][16] The UV-polymerizable trivalent/monovalent acrylate mixture employed in the present study was composed of

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“…특히 최근, 하이브리드 전기자동차, 대전력 에너지 저장장치 등, 저가 격화가 필수인 대형 리튬 이차전지의 개발이 활발하게 진 행되면서 분리막의 가격을 낮추기 위한 연구 혹은 비슷한 가격에서 성능을 향상시키려는 연구가 많은 관심을 받고 있다. [8][9][10][11][12][13][14][15][16] 일반적으로 30~50%의 기공도를 포함하고 있는 폴리올레핀계 분리막은 대량생산에 필요한 인장강도인 100 MPa (machine direction, MD)을 확보하기 위하여 16~2 0 µm의 두께 이상으로 제조되고 있다. 17…”

Section: 서 론unclassified

Influence of Heat Treatment on Separators for Lithium Secondary Batteries

Lee¹,

Ryu²

2012

Polymer Korea

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Heat treatment effect of polyethylene (PE) separators was investigated after storage at 80, 100 and 120 o C for 1 h. All the samples showed enhanced tensile strength and modulus after heat treatment, but thermal shrinkage up to 15% was observed in PE films having newly formed dimple structure on the surface of fiber after annealed at 100 and 120 o C. Although there was 5% of thermal shrinkage after annealing at 80 o C, no such serious changes in PE fiber was observed. Furthermore, the separator was found to have enhanced cell performance with 1.3 and 2.3 times higher tensile strength and modulus after heat treatment at 80

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Cycling performance of a lithium-ion polymer cell assembled by in-situ chemical cross-linking with fluorinated phosphorous-based cross-linking agent

Cited by 35 publications

References 17 publications

Effect of polyacrylonitrile on triethylene glycol diacetate-2-propenoic acid butyl ester gel polymer electrolytes with interpenetrating crosslinked network for flexible lithium ion batteries

Effect of polyacrylonitrile on triethylene glycol diacetate-2-propenoic acid butyl ester gel polymer electrolytes with interpenetrating crosslinked network for flexible lithium ion batteries

A Facile Approach to Fabricate Self‐Standing Gel‐Polymer Electrolytes for Flexible Lithium‐Ion Batteries by Exploitation of UV‐Cured Trivalent/Monovalent Acrylate Polymer Matrices

Influence of Heat Treatment on Separators for Lithium Secondary Batteries

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