title: Hyperbranched β-cyclodextrin polymer as an effective multidimensional binder for silicon anodes in lithium rechargeable batteries.
abstract: Polymeric binders play an important role in electrochemical performance of high-capacity silicon (Si) anodes that usually suffer from severe capacity fading due to unparalleled volume change of Si during cycling. In an effort to find efficient polymeric binders that could mitigate such capacity fading, herein, we introduce polymerized β-cyclodextrin (β-CDp) binder for Si nanoparticle anodes. Unlike one-dimensional binders, hyperbranched network structure of β-CDp presents multidimensional hydrogen-bonding interactions with Si particles and therefore offers robust contacts between both components. Even the Si nanoparticles that lost the original contacts with the binder during cycling recover within the multidimensional binder network, thus creating a self-healing effect. Utilizing these advantageous features, β-CDp-based Si electrode shows markedly improved cycling performance compared to those of other well-known binder cases, especially when combined with linear polymers at an appropriate ratio to form hybrid binders.
authors.affiliation: Graduated School of EEWS, ‡Department of Mechanical Engineering, §Department of Chemistry, and ∥Center for Nature-inspired Technology (CNiT), KAIST Institute NanoCentury, Korea Advanced Institute of Science and Technology (KAIST) , Daejeon, 305-701, Republic of Korea.
authors.forename: You Kyeong
authors.initials: YK
authors.lastname: Jeong
authors.forename: Tae-woo
authors.initials: TW
authors.lastname: Kwon
authors.forename: Inhwa
authors.initials: I
authors.lastname: Lee
authors.forename: Taek-Soo
authors.initials: TS
authors.lastname: Kim
authors.forename: Ali
authors.initials: A
authors.lastname: Coskun
authors.forename: Jang Wook
authors.initials: JW
authors.lastname: Choi
mesh_terms: D011211:Electric Power Supplies; D004566:Electrodes; D004735:Energy Transfer; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008094:Lithium / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry; D012825:Silicon / Q000737:chemistry*; D047392:beta-Cyclodextrins / Q000737:chemistry*
chemical_list: D011108:Polymers; D047392:beta-Cyclodextrins; D008094:Lithium; C031215:betadex; D012825:Silicon