A polypropylene (PP) supported solid polymer electrolyte enables high-stability organic lithium batteries at low...

Area of Science:

• Materials Science
• Electrochemistry
• Polymer Science

Background:

• Solid-state batteries offer enhanced safety and energy density compared to conventional lithium-ion batteries.
• Low-temperature performance remains a significant challenge for many existing battery technologies.
• Development of efficient solid polymer electrolytes (SPEs) is crucial for advancing solid-state battery applications.

Purpose of the Study:

• To develop a novel solid polymer electrolyte (SPE) for efficient low-temperature operation.
• To investigate the electrochemical performance of a pyrene-4,5,9,10-tetraone (PTO)||SPE||Li battery at 0 °C.
• To demonstrate the potential of SPEs in solid-state organic batteries (SSOBs).

Main Methods:

• A sandwich-like SPE was fabricated by coating PEO-LiTFSI-SN paste onto both surfaces of a polypropylene (PP) separator.
• Electrochemical conductivity of the SPE was measured at room temperature and 0 °C.
• A PTO||SPE||Li battery was assembled and tested for its discharge specific capacity, cycling stability, and coulombic efficiency at 0 °C.

Main Results:

• The SPE exhibited a conductivity of 4.22 × 10^-3 S cm^-1 at room temperature and 7.75 × 10^-5 S cm^-1 at 0 °C.
• The PTO||SPE||Li battery achieved a maximum discharge specific capacity of 187.8 mA h g^-1 at 20 mA g^-1 and 0 °C.
• After 100 cycles at 0 °C, the battery retained 88.4 mA h g^-1 with a stable coulombic efficiency of 98%.

Conclusions:

• The developed SPE demonstrates promising ionic conductivity and electrochemical stability at low temperatures.
• The PTO||SPE||Li battery shows excellent cycling performance and capacity retention at 0 °C.
• This work presents a new strategy for developing high-performance solid-state organic batteries for low-temperature applications.