No abstract

The low room temperature ionic conductivity (RTσ) of polyethylene oxide (PEO)-based solid-state polymer electrolyte (SPE) severely restricts its application for lithium batteries. Herein, acrylamide (AM) has been introduced into the poly(ethylene glycol) methyl ether methacrylate-poly(ethylene glycol) diacrylate (P-P). The multiple hydrogen bonds of AM expand the original single lithium environmentand Li•••OC), which accelerates the conduction of lithium ions. In addition, the double bond modification of nanosilica (SiO 2 ) not only improves the mechanical properties but also brings a high-speed orderly vehicular transport mechanism. The multiple-lithium-ions environment is rearranged on the surface of the SiO 2 to play a more significant role, making the RTσ of SPE reach 2.6 × 10 −4 S cm −1 , and the Li-ion transfer number reaches 0.84. The results show that the assembled all-solid-state lithium−sulfur battery has a high initial discharge capacity of 707 mAh g −1 at 30 °C when the sulfur loading is 4.3 mg cm −2 , good cycle stability (capacity retention rate of 89% after 100 cycles at 0.1 C), and excellent rate performance. This SPE with high RTσ, stable interface engineering, and broad potential window (5.1 V) is expected to be used in other lithium/lithium-ion batteries that require high-voltage tolerance.

Insufficient energy density and poor cyclic stability is still challenge for conductive polymer-based supercapacitor. Herein, high performance electrochemical system has been assembled by combining poly (3,4-ethylenedioxythiophene) (PEDOT):poly (styrene sulfonate) (PSS) redox electrode and potassium iodide redox electrolyte, which provide the maximum specific capacity of 51.3 mAh/g and the retention of specific capacity of 87.6% after 3000 cycles due to the synergic effect through a simultaneous redox reaction both in electrode and electrolyte, as well as the catalytic activity for reduction of triiodide of the PEDOT:PSS.

A novel ester-rich copolymer/ionic liquid quasi-solid-state electrolyte (SPE-IL) was designed, and dual Li-ion migration channels (“association–disassociation” with the carbonyl groups and rapid ion exchange with the ionic liquids) were built in it.