Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 38, Pages 45139-45148Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c13971
Keywords
lithium-ion battery; silicon anode; binder; solid electrolyte interphase
Funding
- National Natural Science Foundation of China [52002352, 21902144, 52071295]
- Natural Science Foundation of Zhejiang Province [LY17E020010, LD18E020003]
- Leading Innovative and Entrepreneur Team Introduction Program of Zhejiang [2020R01002]
- Jiangsu Key Laboratory for Carbon-Based Functional Materials Devices [KJS1901]
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Silicon is promising for lithium storage due to its high capacity and low working platform, but volume changes during cycling lead to material pulverization and electrode cracking. A robust binder is essential for maintaining Si electrode integrity, yet its role in modulating the chemical composition and spatial distribution of the SEI layer is often overlooked.
The use of silicon (Si) for lithium (Li) storage has the significant merits of an ultrahigh theoretical specific capacity and a low working platform, potentially enabling a high-energy-density Li-ion battery (LIB). However, the Si itself undergoes a huge volume variation (>300%) upon the lithiation/delithiation process, which inevitably causes material pulverization and electrode cracking as well as ceaselessly repairs the solid electrolyte interphase (SEI), eventually resulting in a rapid capacity decay of the Si anode. Presently, using a robust binder has been well-recognized as an effective solution, which is generally explained by its robust mechanical properties that enable the electrode integrity of the Si anode during the repeated cycling process. Comparatively, the roles of the binder in modulating the chemical composition and the spatial distribution of the Si-based SEI layer are overlooked. This review will specifically provide an overview of the correlation between the binder species and SEI properties. The binder species have a critical role of inducing a robust SEI layer by selectively allowing the electrolyte salt and the solvent to connect the Si surface in the initial discharging process. Finally, we conclude by providing the perspective of the binder design based on interfacial chemistries and new characterization techniques.
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