http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Bolormaa Gendensuren (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
-
Gendensuren, Bolormaa,Oh, Eun-Suok Elsevier Sequoia 2018 Journal of Power Sources Vol. No.
<P><B>ABsTRACT</B></P> <P>In lithium ion batteries, high-capacity anodes that undergo very large volume change during charge/discharge cycles are needed to apply a strongly adhesive polymer binder due to the severe mechanical stress developed during the cycles. Although bio-derived alginate is known to be a potential candidate for the binder owing to its strong mechanical property, it can be improved using a number of modifications such as physical crosslinking. Here, we propose a significantly better method of improving the electrochemical performance of the binder by introducing dual-crosslinked alginate with polyacrylamide. The polyacrylamide provides strong adhesion in the electrode with resistance to the penetration of the organic electrolyte. Both ionic and covalent crosslinkings in the binder maintain their intrinsic good binding properties and additionally enhance lithium ion diffusion. More interestingly, an in-situ electrochemical dilatometer study indicates that the dual-crosslinked binder is considerably helpful to prevent volume expansion beyond the inevitable value caused by active materials in electrodes during the cycle. Consequently, the Si/C (1/3) electrode retains nearly 840 mAh g<SUP>−1</SUP> high capacity even after one hundred cycles with excellent cycleability.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A bio-derived alginate is grafted with a strongly adhesive polyacrylamide. </LI> <LI> The dual-crosslinking is achieved by ionic and chemical crosslinkers. </LI> <LI> The dual-crosslinked binder has strong adhesion with low electrolyte uptakes. </LI> <LI> The dual-crosslinked binder helps to prevent extra volume expansion during cycle. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
-
Bolormaa Gendensuren,Chengxiang He,오은석 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.2
The modification of pectin polysaccharide through grafting with polyacrylamide and crosslinking is newly proposed as a powerful candidate for a water-soluble binder of high-capacity Si anodes in lithium ion batteries. The grafting of pectin with polyacrylamide enhances adhesion in the electrode and contributes to the good wettability of the carbonate electrolyte. Herein, dual-crosslinking of pectin-g-polyacrylamide was achieved by the ionic crosslinking of pectin with divalent calcium ions and the chemical crosslinking of polyacrylamide with a bisacrylamide. As a result, the dual-crosslinked binder improves further the cycling performance of the Si/C composite anode with a 1.2mg cm2 loading, which retains a specific capacity of 729 mAh g1 after 300 cycles. In contrast, the Si/C electrode containing dual-crosslinked alginate with polyacrylamide shows a specific capacity of 515mAh g1 after 300 cycles.
-
최인영,Bolormaa Gendensuren,이지은,오은석 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.4
Unlike high-capacity silicon active materials, lithium titanate Li4Ti5O12 (LTO) as an anode material in lithium-ion battery shows almost no volume change during the charge/discharge processes. This fact rather neglects the importance of binder materials for the LTO electrode. A few research efforts indicate that a polymer binder aiding rapid ion or electron transfer is suitable for the LTO electrode. In this study, the synergetic effect between branched guar gum polysaccharide and polar nitrile groups was thoroughly investigated as a promising binder candidate for the LTO electrode. The cyanoethyl-guar gum binder synthesized by a straightforward cyanoethylation of guar gum with acrylonitrile leads to lower resistance on lithium-ion transport and electrolyte penetration due to the strongly polar nitrile groups. Compared to the pristine guar gum binder-based LTO electrode, therefore, the LTO electrode containing the cyanoethyl-guar gum binder exhibits superior rate performance with improved kinetics.
-
Eun-Suok Oh,Seul Lee,Bolormaa Gendensuren,Boyeon Kim,Sangik Jeon,Young-Hyun Cho,Taewon Kim 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.11
The electrochemical properties of two water-emulsified polymers, styrene-butadiene rubber, and polytetrafluoroethylene, on activated carbon electrochemical capacitors were systematically compared. All electrodes were fabricated with different ratios of styrene-butadiene rubber and polytetrafluoroethylene: 4 : 0, 3 : 1, 2 : 2, and 1 : 3. A good dispersion of styrene-butadiene rubber nanoparticles maintains mesopores in activated carbon, whereas an increase in polytetrafluoroethylene binder content in the electrodes reduces mesoporous surface area significantly due to the lump polytetrafluoroethylene structure coagulated by smashed particles in water. The relatively strong adhesion of the styrene- butadiene rubber binder also leads to better cyclability for extremely long cycles and the rate capability with various current densities at room temperature. At a high temperature of 60 oC, however, the electrodes containing polytetrafluoroethylene binder showed comparable high specific capacitance due to the high thermal stability of polytetrafluoroethylene.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
