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Poly(4-vinylbenzoic acid): A Re-Engineered Binder for Improved Performance from Water-Free Slurry Processing for Silicon Graphite Composite Electrodes
In silicon-based lithium-ion batteries, polymeric binders play the crucial role of “gluing” the electrode matrix together, providing strong adhesion between the active silicon (Si) and conductive carbon particles and keeping them in electrical contact, despite considerable volumetric changes during cycling. While remarkable progress has been seen in the development of binders, improved cycling performance is still needed to fully enable Si anodes. Achieving that end requires in turn a better understanding of the relationship between binder properties and cell cycling performance. Here, we describe a novel polymer binder, poly(4-vinylbenzoic acid) (P4VBA), developed by re-engineering the widely used poly(acrylic acid) (PAA) binder to explore that relationship. The modified structure produces a binder that is more compatible with 1-methyl-2-pyrrolidinone (NMP) slurries and affords much improved cycling performance of the fabricated cells. Compared with PAA binders, P4VBA provides higher initial and average capacities and better capacity retention. While P4VBA offers an interesting alternative to wet processing of the Si-based electrodes, this re-engineered binder is an initial effort to develop a better binder material by exploring the relationship between binder and cell cycling performance.
Conversion of Methane to Graphite-Like Carbon Nanoparticles Using a Low-Temperature Dusty Plasma
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Reversing the Native Aerobic Oxidation Reactivity of Graphitic Carbon: Heterogeneous Metal-Free Alkene Hydrogenation
Commercially available carbon blacks serve as capable metal-free catalysts for the selective hydrogenation of carbon–carbon multiple bonds under aerobic conditions using hydrazine as the terminal reductant. The reaction, which proceeds through a putative diimide intermediate, shows high tolerance to a variety of functional groups, including those sensitive to nucleophilic displacement by hydrazine, aerobic oxidation, or hydrazine-mediated reduction. Hydrazine chemisorbs strongly to the carbon surface, attenuating its native oxidative reactivity and allowing for selective hydrogenation. The catalytic sequence established here effectively umpolungs the reactivity of carbon, thus enabling the use of this low-cost material in selective reduction catalysis.
Concerted Proton-Coupled Electron Transfer to a Graphite Adsorbed Metalloporphyrin Occurs by Band to Bond Electron Redistribution
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Graphite-Conjugated Acids Reveal a Molecular Framework for Proton-Coupled Electron Transfer at Electrode Surfaces
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Heterogeneous Electrochemical Ammonia Oxidation with a Ru-bda Oligomer Anchored on Graphitic Electrodes via CH−π Interactions
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Nickel-Doped Graphite and Fusible Alloy Bilayer Back Electrode for Vacuum-Free Perovskite Solar Cells
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The Role of Ionic Liquid Electrolyte in an Aluminum–Graphite Electrochemical Cell
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Sustainable Conversion of Lignocellulose to High-Purity, Highly Crystalline Flake Potato Graphite
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Graphite Conjugation of a Macrocyclic Cobalt Complex Enhances Nitrite Electroreduction to Ammonia
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