Novel PEO-based composite electrolyte for low-temperature all-solid-state lithium metal batteries enabled by interfacial cation-assistance

Dual-Coordination-Induced Poly(vinylidene fluoride)/Li6.4Ga0.2La3Zr2O12/Succinonitrile Composite Solid Electrolytes Toward Enhanced Rate Performance in All-Solid-State Lithium Batteries

“…The surface of PVDF-LiTFSI SPE shows some pores due to the evaporation of the solvent, but the PVDF-10%LLZO and PVDF-10%LLZO-10%SN CSEs exhibit more compact structures. It may be attributed to the reduced crystallinity and enhanced flexibility of the PVDF matrix with the incorporation of LLZO nanofillers and SN. , More importantly, the SPE presents a spherulite-type structure, while the surface of PVDF-10%LLZO-10%SN presents interconnected microstructures, which might favor internal ion hopping and migration. Figure S3 presents the element distributions (F, Zr, S, and N) in PVDF-10%LLZO-10%SN composite electrolytes, which confirms the uniform distributions of LLZO, LiTFSI, and SN in the PVDF matrix.…”

“…It may be attributed to the reduced crystallinity and enhanced flexibility of the PVDF matrix with the incorporation of LLZO nanofillers and SN. 39,40 More importantly, the SPE presents a spherulite-type structure, while the surface of PVDF-10%LLZO-10%SN presents interconnected microstructures, which might favor internal ion hopping and migration. Figure S3 presents the element distributions (F, Zr, S, and N) in PVDF-10%LLZO-10%SN composite electrolytes, which confirms the uniform distribu- Although the mechanical properties of the PVDF-10%LLZO-10%SN electrolyte declined due to the plasticization of SN, it still shows higher strength and flexibility than SPE.…”

Metal–Organic Framework-Coated Fiber Network Enabling Continuous Ion Transport in Solid Lithium Metal Batteries

“…In the case of Li–MOF@NWF/PEO, the NWF fiber surface is tightly encapsulated by Li–MOF particles and hydrogen bonds exist between them, resulting in a solid electrolyte capable of decomposition temperatures up to 300 °C . It can be observed that the thermal decomposition temperature of all three composite solid-state electrolytes is above the operating temperatures for practical solid-state batteries. ,, PEO crystallinity in solid-state electrolytes and phase transition processes was evaluated using DSC, as presented in Figure S5 (Supporting Information). Results reveal that the melting temperature ( T m ) of LNWF/PEO, Li–MOF/NWF/PEO, and Li–MOF@NWF/PEO decreases to 48.3, 48.6, and 48.4 °C compared to 53.3 °C for PEO.…”

Exploring High Li+ Transference Number Solid-State Electrolytes Based on a Poly(ε-caprolactone) Polymer Matrix with Efficient Lithium Salt Dissociation for Applications in Lithium-Metal Batteries

“…The σ of CPE-Z40 is predicted to be 4.88 × 10 –5 S·cm –1 at 60 °C, which is higher compared with CPE-Z20 (3.06 × 10 –5 S·cm –1 ) and CPE-Z60 (3.52 × 10 –5 S·cm –1 ) electrolytes. It should be mentioned that the reorganization of PCL is effectively prevented and the ratio of the crystalline phase correspondingly decreases as the LLZO content (≤40 wt %) increases, resulting in increased ionic conductivity . When the content of LLZO exceeds 40 wt %, excess LLZO particles are prone to agglomeration, which eliminates the effective interfaces and reduces the polymer free-volume and finally decreases the ionic conductivity .…”

“…Zhang et al reported a PEO/SN-based CPE with a high room-temperature σ of 6.74 × 10 −4 S•cm −1 and a high capacity retention of 92.6% after 240 cycles at 0.5C. 13 Wang et al synthesized PEO-based CPEs by the in situ introduction of SiO 2 , and the battery exhibited a high discharge capacity of 161.2 mAh•g −1 at 0.5C with a capacity retention of 88% after 400 cycles. 14 However, the anionic dynamics generally supersedes the cationic dynamics, resulting in low t Li+ in PEO systems, since the anion mobility is less restricted by the polymer segmental motions.…”