A relaxor ferroelectric polymer with an ultrahigh dielectric constant largely promotes the dissociation of lithium salts to achieve high ionic conductivity

Abstract

The extremely low room-temperature ionic conductivity of solid-state polymer electrolytes (SPEs) ranging from 10-7 to 10-5 S cm-1 seriously restricts their practical application in solid-state lithium metal batteries (LMBs). Herein,...

Heterogeneous Nanodomain Electrolytes for Ultra‐Long‐Life All‐Solid‐State Lithium‐Metal Batteries

“…The total interaction energy (Figure S17 and Table S5, Supporting Information) also verifies that the interaction between NH and TFSI – endows PA chains with potent immobilization of TFSI – , contributing to the dissociation of LiTFSI and providing more free Li + in Pebax HNE (12). [ 23 ] Furthermore, the interaction between Li + and COC/CO in Pebax HNE (12) is stronger than that of Li + with COC in PEO, suggesting the unstable coordination structure of Li + with COC/CO, which is conducive to the faster diffusion of Li + . Meanwhile, a quantitative characterization of Li + mobility in the transport process via the mean square displacement (MSD) is simulated (Figure 2f and Figure S18, Supporting Information).…”

A high polarity poly(vinylidene fluoride-co-trifluoroethylene) random copolymer with an all-trans conformation for solid-state LiNi0.8Co0.1Mn0.1O2/lithium metal batteries

“…S10 †). 12,13,24,32 The greater X c and higher T g are supposed to endow P(VDF-TrFE) SPEs with lower ionic conductivity than PVDF SPEs according to the current understanding of ion transport in SPEs, where chain segments in the amorphous phase of the polymer play vital roles in transmitting Li + . 1,33 However, P(VDF-TrFE) SPEs show a much higher ionic conductivity than PVDF SPEs, then it is logical to attribute the enhanced ionic conductivity to the high polarity (Fig.…”

“…the strongest ability to dissociate lithium salts and thus improve the ionic conductivity. 24,34,35 To support the DFT calculation, t Li + is calculated via a method proposed by Evans et al 36,37 As shown in Fig. 3d, P(VDF-TrFE) SPEs show a much higher t Li + of 0.455 than PVDF SPEs (0.298, Fig.…”

“…20,23 PVDF SPEs usually show mixed TGTG 0 and T 3 GT 3 G 0 conformations owing to their commonly used solution casting method in N,N dimethylformamide (DMF). 24 Although the TTTT conformation of PVDF could be induced by strategies such as stretching, electrical poling, annealing, etc., 20,23,25 these methods are not applicable for SPE preparation due to the existence of unstable lithium salts under melt processing or high electric elds. 26 For instance, we previously proved that a pure TTTT conformation could be induced by the electric poling of PVDF lms under an extremely high electric eld (>650 MV m À1 ).…”

Ion–Dipole Interaction Regulation Enables High‐Performance Single‐Ion Polymer Conductors for Solid‐State Batteries

“…[6] Many efforts have been made to increase the ionic conductivity of polymer electrolytes, including developing new polymer matrix, adding plasticizers, making composite electrolytes, and so on. [7][8][9][10][11] These methods indeed can increase the values of ionic conductivity, but the performance of full cells is still unsatisfactory, because ionic conductivity is not the only one parameter that determines the transport behaviors of Li-ions and anions in solid-state electrolytes.…”