Synthesis and ion conduction mechanism of a new sodium ion conducting solid polymer electrolytes

The Unusual Conductivity of Na+ in PEO‐Based Statistical Copolymer Solid Electrolytes: When Less Means More

“…[22] TheEO/ PO composition of the statistical polymers was determined by 1 HNMR (see Figures S1 to S5). Microstructure characterization was assessed by 13 Cq uantitative NMR (see Figures S6 to S13). Structural, morphological, and thermal properties of copolymers are reported in Table 1a nd Table S1.…”

“…In PEO, the coordination energy of oxygen atoms with Na + is lower than with Li + , [9, 10] which should allow faster diffusion, hence higher ionic conductivity. However, to our knowledge, it is not what has been observed so far, and a low ionic conductivity (<10 −6 S cm −1 ) at room temperature has halted further development of Na + ‐based SPEs [11–14] . Therefore, it is of paramount importance to unlock PEO's potential for Na + ionic conductivity at room temperature.…”

“…[8] In PEO,the coordination energy of oxygen atoms with Na + is lower than with Li + , [9,10] which should allow faster diffusion, hence higher ionic conductivity.However,toour knowledge,itisnot what has been observed so far,a nd al ow ionic conductivity (< 10 À6 Scm À1 )a tr oom temperature has halted further development of Na + -based SPEs. [11][12][13][14] Therefore,i ti so f paramount importance to unlock PEOsp otential for Na + ionic conductivity at room temperature.A sc rystallinity is acentral obstacle to ionic conduction, PEO-based SPEs must be used above their melting temperature (62 8 8C). To increase conductivity,h igh amounts of Na + salt (ca.…”

Giant Thermopower of Hydrogen Ion Enhanced by a Strong Hydrogen Bond System

“…In a large number of studies on restricting ion movement through polymer networks, the most typical example is undoubtedly the restriction of crystallinity to ion movement, − that is, we often say that under a certain ion concentration, polymers with low crystallinity have higher ionic conductivity, while polymers with high crystallinity have lower ionic conductivity. − Obviously, the low ionic conductivity caused by high crystallization often needs to be avoided in polymer electrolytes. However, the ion-binding effect brought by high crystallinity may be very valuable in the field of ionic thermoelectricity.…”