Highly adhesive and stretchable binder for silicon-based anodes in Li-ion batteries
- PDF / 4,153,412 Bytes
- 8 Pages / 595.276 x 790.866 pts Page_size
- 25 Downloads / 199 Views
ORIGINAL PAPER
Highly adhesive and stretchable binder for silicon-based anodes in Li-ion batteries Ruixian Tang 1 & Xiao Zheng 1 & Yu Zhang 1 & Lei Ma 1 & Yanru Dong 1 & Guolong Kong 1 & Liangming Wei 1 Received: 11 June 2020 / Revised: 14 August 2020 / Accepted: 18 August 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Silicon is a promising anode material for lithium-ion batteries because of its high theoretical capacity, but Si particles are faced with huge volume change during charge/discharge process, causing a rapid capacity degradation. Among various methods designed to improve the performance of lithium-ion batteries, employing flexible binders is an effective way to sustain the bending of electrodes and the volume change of Si particles. Herein, we develop a polymer binder composed of carboxymethyl cellulose and polydopamine. This polymer composite binder is instrumental in moderating mechanical fracture of the Si anode during cycling, showing excellent adhesion force (10.8 N) and high stretchability (128.7%). The electrochemical properties (80% capacity retention after 150 cycles with an initial capacity of 2303 mAh g−1) of the Si anode show obviously improvement. Keywords Binder . Stretchable . Adhesive . Si anode . Li-ion battery
Introduction Lithium-ion batteries (LIBs) are one of the most promising energy storage devices because of their high energy density [1–3]. With a fast-growing demand of energy storage systems, long-cycle-life and stable-performance LIBs are urgently required. Silicon (Si) is an attractive anode material for highperformance LIBs because of its high theoretical capacity (3578 mAh g−1 for lithiation to Li15Si4), low discharge potential, and abundant reserves in the Earth’s crust [4–6]. However, the practical application of Si in LIBs is facing large challenges owing to the volume change (> 300%) of Si particles in the process of lithium insertion. The huge volume change leads to breakage and disconnection of Si particles, which eventually results in electrode pulverization, capacity reduction, and poor cycling stability [7–11]. As the main Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11581-020-03747-7) contains supplementary material, which is available to authorized users. * Liangming Wei [email protected] 1
Key Laboratory for Thin Film and Microfabrication of the Ministry of Education, Department of Microelectronics and Nanoscience, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
source of mechanical properties of the whole electrode, binders have an assignable influence on the electrochemical performance of LIBs [12–15]. Some water-based polymer materials with carboxylic groups have been employed as binders for Si anodes, such as carboxymethyl cellulose (CMC) [16–18], polyacrylic acid (PAA) [19, 20], and sodium alginate [21, 22]. The hydrogen bonds formed between these polymer binders and the surface of silicon
Data Loading...
