Abstract
The design of novel binder systems is required for the high capacity silicon (Si) anodes which usually undergo huge volume change during the charge/discharge cycling. Here, we introduce a poly (acrylic acid sodium)-grafted-carboxymethyl cellulose (NaPAA-g-CMC) copolymer as an excellent binder for Si anode in lithium ion batteries (LIBs). The NaPAA-g-CMC copolymer was prepared via a free radical graft polymerization method by using CMC and acrylic acid as precursors. Unlike the linear, one-dimensional binders, the NaPAA-g-CMC copolymer binder is expected to present multi-point interaction with Si surface, resulting in enhanced binding ability with Si particles as well as with the copper (Cu) current collectors, and building a stable solid electrolyte interface (SEI) layer on the Si surface. The NaPAA-g-CMC based Si anode shows much better cycle stability and higher coulombic efficiency than those made with the well-known linear polymeric binders such as CMC and NaPPA.
Highlights
IntroductionThe one-dimensional (1D), linear chain nature of these polymers limits their multi-point interaction with Si particles[36]
Of silicon anodes[33,34,35]
The NaPAA-g-CMC polymeric binders were synthesized via free radical graft polymerization by using CMC and acrylic acid as precursors and persulphate as a radical initiator
Summary
The one-dimensional (1D), linear chain nature of these polymers limits their multi-point interaction with Si particles[36]. It is desirable to develop three-dimensional polymer networks, such as interpenetrated PAA/ polyvinyl alcohol gel[31], crosslinked CMC-PAA32 and hyperbranched β -cyclodextrin[36] to improve the interaction between Si and binders, enhancing electrochemical performance of the batteries. The NaPAA-g-CMC binders with branched structure is believed to present multi-point interaction with Si surface, resulting in enhanced binding ability with Si particles as well as with the copper (Cu) current collectors, and building a stable SEI layer on the Si surface.
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