Abstract
All-solid-state polymer lithium batteries have good safety, stability, and high energy densities and are employed in wireless sensors. However, the solid contact between the polymer electrolyte and the cathode leads to high interface resistance, limiting the broad application of solid-state lithium batteries. This paper proposes an ultrasonic fusion method to reduce the interface resistance between the polymer electrolyte and the cathode. The method applied a high-frequency ultrasonic vibration technique to impact the polymer electrolyte/cathode structure, melting the electrolyte at the interface and thus generating good contact at the interface. The experimental results showed that the ultrasonic fusion method decreased the interface resistance between the polymer electrolyte and the cathode by 96.2%. During the ultrasonic fusion process, high-frequency ultrasonic vibrations generated high temperatures at the interface, and the polymer electrolyte became molten, improving the contact between the electrolyte and the cathode. The ultrasonic fusion method eliminated the gaps at the interface, and the interface became more compact. Furthermore, ultrasonic vibrations made the molten electrolyte fill the holes in the cathode, and the contact area was enhanced, providing more Li+ ions transmission paths.
Highlights
Wireless Sensor Networks (WSNs) have attracted a significant amount of attention thanks to their pervasive nature and wide range of applications in emerging fields, such as the Internet of Things and Cyber–Physical Systems [1,2]
Zipei Wan et al [8] used polyethylene oxide (PEO) and lithium bis(trifluoromethylsulfonyl)imide (LiTFSI) as the cathode binders and prepared a composite electrolyte matrix embedded with Li7La3Zr2O12 (LLZO) nanowires
The results showed that the interface resistance between the solid electrolyte and the electrode was reduced by two orders of magnitude
Summary
Wireless Sensor Networks (WSNs) have attracted a significant amount of attention thanks to their pervasive nature and wide range of applications in emerging fields, such as the Internet of Things and Cyber–Physical Systems [1,2]. All-solid-state polymer lithium batteries are employed as power sources for wireless sensors because of their excellent safety, stability, and high energy density [5,6]. The high interface resistance between the solid electrolyte and the cathode severely limits the broad application of all-solid-state polymer lithium batteries. In order to improve the contact at the interface and eliminate the gaps to reduce the interface resistance between the solid electrolyte and the cathode, researchers have conducted much research in recent years. The PEO in the cathode and the composite electrolyte were fused at a high temperature to form an integrated electrolyte/electrode structure, which effectively enhanced the interface compatibility and stability between the electrolyte and cathode and ensured efficient lithium-ion transport at the interface. An interface between the solid electrolyte and the cathode with tight contact, low interface resistance, and fast ion transport was achieved. The results showed that the interface resistance between the solid electrolyte and the electrode was reduced by two orders of magnitude
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