Self-Healable Poly(Acrylic Acid) Binder toward Optimized Electrochemical Performance for Silicon Anodes: Importance of Balanced Properties
- Authors
- Preman, Anjali Nagapadi; Vo, Thuan Ngoc; Choi, Subi; Lee, Hyocheol; Lim, Ye Eun; Kim, Il Tae; Ahn, Suk-kyun
- Issue Date
- Jan-2024
- Publisher
- AMER CHEMICAL SOC
- Keywords
- self-healing; binder; Si anode; lithium-ionbatteries; copolymers
- Citation
- ACS APPLIED ENERGY MATERIALS, v.7, no.2, pp 749 - 759
- Pages
- 11
- Journal Title
- ACS APPLIED ENERGY MATERIALS
- Volume
- 7
- Number
- 2
- Start Page
- 749
- End Page
- 759
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/90347
- DOI
- 10.1021/acsaem.3c02825
- ISSN
- 2574-0962
- Abstract
- Si is a promising anode for high-energy lithium-ion batteries, but its severe capacity decay due to volume changes remains a challenge. To address this, we synthesized a series of acrylic copolymer binders with randomly distributed carboxylic acid (CA) and n-butyl carbamate (BC) groups. CA groups ensure good adhesion to the Si surface, while BC groups provide self-healing as well as a wide range of thermal and mechanical properties. By fine-tuning the content of these functional groups, we optimize the mechanical, adhesion, and self-healing properties, and electrolyte uptake of the binders to maximize their electrochemical performance. The Si electrode with a binder containing 68 mol % CA groups and 32 mol % BC groups achieves a high initial discharge capacity of 3628 mA h g(-1), with an initial Coulombic efficiency (ICE) of 84%. This electrode also displays a discharge capacity of 2334 mA h g(-1) after 100 cycles at 0.5 A g(-1), surpassing the performance of a Si-poly(acrylic acid) electrode (3171 mA h g(-1) at the first cycle, ICE of 86%, and 1367 mA h g(-1) at the 100th cycle at 0.5 A g(-1)). Through a systematic investigation of the structure-property-electrochemical performance relationship, we prioritize the desired properties of the binder to enable the development of high-performance Si anodes.
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