Poly (acrylic acid- co - N -methylol acrylamide- co -butyl acrylate) copolymer grafted carboxymethyl cellulose binder fo
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RESEARCH ARTICLE
Poly (acrylic acid-co-N-methylol acrylamide-co-butyl acrylate) copolymer grafted carboxymethyl cellulose binder for silicon anode in lithium ion batteries Lei Ma1 · Yu Zhang1 · Xiaoyu Wang1 · Ruixian Tang1 · Xiao Zheng1 · Yanru Dong1 · Guolong Kong1 · Zhongyu Hou1 · Liangming Wei1 Received: 16 August 2019 / Accepted: 1 September 2020 © Springer Nature B.V. 2020
Abstract A poly (acrylic acid-co-N-methylol acrylamide-co-butyl acrylate) copolymer grafted-carboxymethyl cellulose (PA-PN-PBAg-CMC) binder is synthesized via a free radical copolymerization for Si-based anodes in lithium ion batteries. In this multifunctional polymer binder system, carboxyl-rich poly (acrylic acid) and carboxymethyl cellulose can bond with Si particles and copper current collectors. Additionally, a robust cross-linking network can be obtained through the condensation reaction between hydroxyl and hydroxymethyl groups which are present in carboxymethyl cellulose and N-methylol acrylamide segments, respectively. This network structure helps to keep the integrity of the Si electrode, and thereby significantly improves the cycling performance of the Si anodes (capacity retention rate after 200 cycles is above 90%). The butyl groups in poly (butyl acrylate) segments provide the nonpolar sections in the binder, which help the electrolytes easily wet the electrodes, allowing Li ions to diffuse rapidly in the Si anodes. With this multi-functional binder, the Si-based LIBs perform well in both cycle performance and rate performance.
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10800-020-01480-7) contains supplementary material, which is available to authorized users. * Liangming Wei [email protected] 1
Key Laboratory for Thin Film and Microfabrication of Ministry of Education, Department of Micro/Nano Electronics, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, 800 Dongchuan RD, Minhang District, Shanghai 200240, China
13
Vol.:(0123456789)
Journal of Applied Electrochemistry
Graphic Abstract
Keywords Binder · Silicon · Anode · Lithium ion batteries
1 Introduction Silicon (Si) anodes have been proposed as an ideal candidate to replace the commercially graphite anode which are widely used in lithium ion batteries (LIBs) [1–5] due to its larger theoretical storage capacity for lithium (4200 mA h g − 1, compared with 372 mA h g − 1 for commercial graphite) [6], relatively low charge-discharge potential (~ 0.4 V vs. Li/Li+), richness of reserves, and environmental-friendly characteristics. However, during the charging and discharging cycling, the large volume change (> 300%) of Si particles leads to the fragmentation of the Si electrodes, and subsequently disconnect electrical contact, resulting in rapid capacity decay and correspondingly short cycling life [7–10]. To overcome these problems, many types of Si nanomaterials with unique morphologies, such as nanowires [11], nanotubes [12] and hollow spheres [13–17], are pre
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