Self‐Repairable Silicon Anodes Using a Multifunctional Binder for High‐Performance Lithium‐Ion Batteries

Despite of extremely high theoretical capacity of Si (3579 mAh g−1), Si anodes suffer from pulverization and delamination of the electrodes induced by large volume change during charge/discharge cycles. To address those issues, herein, self‐healable and highly stretchable multifunctional binders, po...

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Bibliographic Details
Published in:Small (Weinheim an der Bergstrasse, Germany) Germany), 2023-03, Vol.19 (9), p.e2206141-n/a
Main Authors: Malik, Yoga Trianzar, Shin, Seo‐Yeon, Jang, Jin Il, Kim, Hyung Min, Cho, Sangho, Do, Young Rag, Jeon, Ju‐Won
Format: Article
Language:English
Subjects:
Anodes
Cracks
Electrolytes
Healing
Lithium-ion batteries
Nanotechnology
Phytic acid
Polyacrylic acid
rate capability
self‐healable silicon anodes
Silicon
Structural integrity
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Summary:Despite of extremely high theoretical capacity of Si (3579 mAh g−1), Si anodes suffer from pulverization and delamination of the electrodes induced by large volume change during charge/discharge cycles. To address those issues, herein, self‐healable and highly stretchable multifunctional binders, polydioxythiophene:polyacrylic acid:phytic acid (PEDOT:PAA: PA, PDPP) that provide Si anodes with self‐healability and excellent structural integrity is designed. By utilizing the self‐healing binder, Si anodes self‐repair cracks and damages of Si anodes generated during cycling. For the first time, it is demonstrated that Si anodes autonomously self‐heal artificially created cracks in electrolytes under practical battery operating conditions. Consequently, this self‐healable Si anode can still deliver a reversible capacity of 2312 mAh g−1 after 100 cycles with remarkable initial Coulombic efficiency of 94%, which is superior to other reported Si anodes. Moreover, the self‐healing binder possesses enhanced Li‐ion diffusivity with additional electronic conductivity, providing excellent rate capability with a capacity of 2084 mAh g−1 at a very high C‐rate of 5 C. Here, we developed a multifunctional self‐healing binder that extends the cycle life of Si anodes by self‐repairing cracks of Si anodes. Furthermore, our self‐healing binder provides enhanced electrokinetics, resulting in exceptional rate capability. For the first time, we also quantified the self‐healing efficiency of Si anodes, which can be widely employed for self‐healing devices.
ISSN:1613-6810
1613-6829
DOI:10.1002/smll.202206141