Journal
SMALL
Volume 14, Issue 29, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201801189
Keywords
lithium-ion batteries; quadruple hydrogen bonding; self-healing binders; silicon anodes; supramolecular polymers
Categories
Funding
- National Natural Science Foundation of China [21474032, 21604025]
- Natural Science Foundation of Guangdong Province [2016A030310461]
- Fundamental Research Funds for the Central Universities [2017MS074]
Ask authors/readers for more resources
With extremely high specific capacity, silicon has attracted enormous interest as a promising anode material for next-generation lithium-ion batteries. However, silicon suffers from a large volume variation during charge/discharge cycles, which leads to the pulverization of the silicon and subsequent separation from the conductive additives, eventually resulting in rapid capacity fading and poor cycle life. Here, it is shown that the utilization of a self-healable supramolecular polymer, which is facilely synthesized by copolymerization of tert-butyl acrylate and an ureido-pyrimidinone monomer followed by hydrolysis, can greatly reduce the side effects caused by the volume variation of silicon particles. The obtained polymer is demonstrated to have an excellent self-healing ability due to its quadruple-hydrogen-bonding dynamic interaction. An electrode using this self-healing supramolecular polymer as binder exhibits an initial discharge capacity as high as 4194 mAh g(-1) and a Coulombic efficiency of 86.4%, and maintains a high capacity of 2638 mAh g(-1) after 110 cycles, revealing significant improvement of the electrochemical performance in comparison with that of Si anodes using conventional binders. The supramolecular binder can be further applicable for silicon/carbon anodes and therefore this supramolecular strategy may increase the choice of amendable binders to improve the cycle life and energy density of high-capacity Li-ion batteries.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available