Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 43, Pages 48677-48683Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c15015
Keywords
solid-state batteries; sodium-ion batteries; high-rate performance; PEO; interfaces
Funding
- National Key R&D Program of China [2016YFB0700600]
- National Natural Science Foundation of China [51672012]
- China Postdoctoral Science Foundation [2019M660317]
- Shenzhen Science and Technology Research Grant [JCYJ20170818085823773, ZDSYS201707281026184]
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Exhibiting superior safety features and low costs, solid-state sodium (Na)-ion batteries have been proposed as an attractive candidate for energy storage. However, the poor rate capability of solid-state batteries has limited their applications. In this work, an all-solidstate Na-ion battery is fabricated, delivering an unprecedented rate capability (60% capacity retention at a C-rate of 100 C with an areal loading of 1.5 mg cm(-2)), which far exceeds other reports so far. More importantly, it is further demonstrated that instead of the Na-ion conductivity of the solid electrolyte, the rate-limiting factors are determined to be chargetransfer resistance at electrode/solid electrolyte interfaces and lack of percolation pathways in the electrode, which can be optimized by tuning the electrode design and testing protocols.
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