About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
|
Symposium
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2022 Undergraduate Student Poster Contest
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Presentation Title |
Enhanced Electrochemical Performance of NCM811 Cathodes with Functionalized PVDF Graft Copolymer Binders |
Author(s) |
Rohan Parekh, Tong Liu, Piotr Mocny, Jay Whitacre, Krzysztof Matyjaszewski |
On-Site Speaker (Planned) |
Rohan Parekh |
Abstract Scope |
Ni0.8Co0.1Mn0.1(NCM811) cathodes are regarded as the predominant cathode materials for next-generation Li-ion batteries due to their high specific energy density. However, undesired structural disruption and thermal instability are observed, often leading to rapid capacity loss and poor capacity retention for NCM811 cathodes. To solve these problems, we propose a novel polymer binder synthesized by grafting poly(vinylidene fluoride-co-chlorotrifluoroethylene) (PVDF-CTFE) to obtain PVDF-based polymers with a comb-like architecture. Atom transfer radical polymerization (ATRP) was used to obtain well-controlled grafted chains with low dispersity and desired length and architecture. A random copolymer of poly(ethylene glycol) methyl ether acrylate and poly(acrylic acid) (PEGMEA-co-PAA) was grafted from the PVDF-CTFE backbone. Benefiting from the ethylene oxide conductive segments in PEGMEA, the Li-ion diffusion and transport were significantly improved. The chelation of TM ions to -COOH groups from PAA also effectively mitigated the TM dissolution and improved structure stability of NCM811. |