期刊
ADVANCED ENERGY MATERIALS
卷 11, 期 22, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202100601
关键词
aligned structures; binder design; conductive networks; high areal capacity; thick electrodes
类别
资金
- National Key R&D Program of China [2016YFB0100300, 2016YFB0700600, 2020YFB07045000]
- Shenzhen Science and Technology Research Grant [JCYJ20200109140416788]
- Chemistry and Chemical Engineering Guangdong Laboratory [19220180]
This study prepared aligned electrodes with high mass loading and areal capacities by copolymerizing xanthan gum and amorphophallus konjac gum, using an ice-templating method. The KG-XG copolymer not only firmly holds active materials together, but also improves effective porosity and homogeneous dispersion of conductive agents.
In order to prepare electrodes with high mass loading and areal capacities, the key issue is to achieve depolarization for both ion and electron transfer on the electrode material surface. In this work, through copolymerization of xanthan gum (XG) and amorphophallus konjac gum (KG) followed by an ice-templating method, aligned electrodes with high areal mass loading of active materials are prepared. In addition to firmly holding active materials together, the prepared KG-XG copolymer also facilitates improved effective porosity as well as homogeneous dispersion of conductive agents (i.e., CNTs). Consequently, with minimum inactive components (i.e., binder and conductive agents), the proposed electrode structure delivers good cycling stability and rate capability under high areal loading (as high as 200 mg cm(-2)). The excellent electrochemical performance can be attributed to the unique aligned structure where the robust conductive network provides an efficient electron and lithium-ion pathway, and the homogenous porosity is beneficial for the electrolyte percolation, hence the reduced polarization during charge transfer. In addition, this electrode preparation method is found to be universal as it is suitable for various types of anode and cathode materials.
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