Understanding Binder–Silicon Interactions during Slurry Processing
- Mary K. Burdette-Trofimov*Mary K. Burdette-Trofimov*Email [email protected]Chemical Sciences Division, Oak Ridge National Laboratory, 1 Bethel Valley Rd., Oak Ridge, Tennessee 37830, United StatesMore by Mary K. Burdette-Trofimov
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- Beth L. Armstrong*Beth L. Armstrong*Email [email protected]Materials Science and Technology Division, Oak Ridge National Laboratory, 1 Bethel Valley Rd., Oak Ridge, Tennessee 37830, United StatesMore by Beth L. Armstrong
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- Alexander M. RogersAlexander M. RogersChemical Sciences Division, Oak Ridge National Laboratory, 1 Bethel Valley Rd., Oak Ridge, Tennessee 37830, United StatesMore by Alexander M. Rogers
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- Luke HerouxLuke HerouxNeutron Scattering Division, Oak Ridge National Laboratory, 1 Bethel Valley Rd., Oak Ridge, Tennessee 37830, United StatesMore by Luke Heroux
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- Mathieu DoucetMathieu DoucetNeutron Scattering Division, Oak Ridge National Laboratory, 1 Bethel Valley Rd., Oak Ridge, Tennessee 37830, United StatesMore by Mathieu Doucet
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- Guang YangGuang YangChemical Sciences Division, Oak Ridge National Laboratory, 1 Bethel Valley Rd., Oak Ridge, Tennessee 37830, United StatesMore by Guang Yang
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- Nathan D. PhillipNathan D. PhillipChemical Sciences Division, Oak Ridge National Laboratory, 1 Bethel Valley Rd., Oak Ridge, Tennessee 37830, United StatesMore by Nathan D. Phillip
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- Michelle K. KidderMichelle K. KidderEnergy Sciences Division, Oak Ridge National Laboratory, 1 Bethel Valley Rd., Oak Ridge, Tennessee 37830, United StatesMore by Michelle K. Kidder
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- Gabriel M. Veith*Gabriel M. Veith*Email [email protected]Chemical Sciences Division, Oak Ridge National Laboratory, 1 Bethel Valley Rd., Oak Ridge, Tennessee 37830, United StatesMore by Gabriel M. Veith
Abstract
The conformation of poly(acrylic acid) (PAA) as a function of shear during slurry processing to construct silicon-based anodes is elucidated via rheology-coupled ultra-small-angle neutron scattering (rheo-USANS). Rheo-USANS shows that PAA with encapsulated silicon exists as discrete aggregates that do not interact with one another. As a result, a well-connected matrix of silicon and carbon black dispersed in PAA does not exist; thus, the electrode is inhomogeneous. Raman mapping and X-ray photoelectron spectroscopy were used to confirm the electrode heterogeneity and further understand the cycling properties. These results are correlated to silicon surface chemistry to provide a pathway to making better electrodes.
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