Nb/Al co‐doped Li₇La₃Zr₂O₁₂ Composite Solid Electrolyte for High‐Performance All‐Solid‐State Batteries

Abstract

All‐solid‐state Li batteries (ASSLBs) are considered suitable candidates to replace conventional batteries utilizing liquid electrolytes. However, the applications of this type of batteries are limited owing to their narrow operating temperature range, low ionic conductivity, poor long‐term stability, and complex production process. Herein, a simple approach that combines all potential battery candidates that have been investigated over the last few years, including polyethylene oxide (PEO), Li7La3Zr2O12 (LLZO), succinonitrile (SN), and Li salt (LiTFSI), is employed to solve the limitations of ASSLBs. LLZO codoped with Al3+ and Nb5+ (NAL) is synthesized at a low temperature using a modified sol‐gel Pechini method. NAL, along with SN, plays a critical role in improving the performance of the resultant solid polymer electrolyte, which can be operated at room temperature. The integrated electrolyte PEO/LiTFSI‐SN‐NAL (PLS‐NAL) delivers a high ionic conductivity of 3.09 × 10−4 S cm−1 and an excellent Li‐ion transference number of 0.75 at room temperature. ASSLBs combining LiFePO4 and PLS‐NAL exhibit excellent cycling stability at both room temperature and 45 °C with a high capacity retention of ≈90% after 200 cycles and cycle life of up to 400 cycles.

Eliminating Li Dendrites in PEO-Based Polymer Solid Electrolytes by Doping with SbF3

“…A comparison with the original PEO and PL (with crystallinities of 68.3 and 57.5%, respectively) reveals a reduction in crystallinity for PEO/1SbF 3 and PLS1, measuring 56.8 and 43.8%, respectively (Figure b, Table S1, Supporting Information). This decrease in crystallinity validates the notion that the addition of SbF 3 promotes the mobility of PEO chain segments, consequently enhancing the transport capacity of Li + . , The aforementioned observation finds further substantiation through DSC analysis, which demonstrates a reduction in the melting transition temperature ( T m ) and melting enthalpy (Δ H m ) upon the introduction of SbF 3 (Figure c, Table S2, Supporting Information). Additionally, the Raman spectra provide valuable insights into the influence of SbF 3 on the SPEs.…”

Improving the ionic conductivity of polymer electrolytes induced by ceramic nanowire fillers with abundant lithium vacancies

“…After 500 cycles, it still has a capacity of 718 mA h g −1 , indicating that the battery has excellent long-time cycle stability. Compared with previous similar studies on the ASSLSBs with CPEs, 7,41–47 the P–E–A@TALLZO NWs CPE possesses higher ionic conductivity and Li + transfer number, and the as-assembled ASSLSB exhibits superior cycle performance (Table S1, ESI†).…”

Three-Dimensional Metal–Organic Framework@Cellulose Skeleton-Reinforced Composite Polymer Electrolyte for All-Solid-State Lithium Metal Battery

“…As shown in Figure S3, the small peak at 2250 cm −1 for ZIF-67@CF/PEO-SN corresponds to the C�N stretching vibration, which is consistent with the characteristic peak of SN. 42 Additionally, the C−O−C (1100 cm −1 ) stretching vibration appeared, indicating that the addition of ZIF-67@CF and SN did not react with PEO. 43 Typically, the high crystallinity of PEO at room temperature hinders the fast conduction of Li + .…”