Journal
NANO LETTERS
Volume 14, Issue 2, Pages 864-870Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl404237j
Keywords
Binder; cyclodextrin; cycle life; lithium ion battery; self-healing; silicon anode
Categories
Funding
- National Research Foundation of Korea (NRF)
- Korea government (MEST) [NRF-2010-C1AAA001-0029031, NRF-2012-R1A2A1A01011970]
- Basic Science Research Program through the National Research Foundation of Korea (NRF)
- Ministry of Science, ICT, & Future Planning [2013R1A1A1012282]
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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 beta-cyclodextrin (beta-CDp) binder for Si nanoparticle anodes. Unlike one-dimensional binders, hyperbranched network structure of beta-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 multidimensional binder network, thus creating a self-healing effect. Utilizing these advantageous features, beta-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.
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