Lithium metal batteries (LMBs) have been recognized as one of the most promising energy storage devices due to their high energy density. The leakage, corrosion to Li metal anode, and flammability of organic liquid electrolytes bring great security problems for LMBs. Polymeric ionic liquid (PIL)‐based solid polymer electrolytes (SPE), possessing nonflammability, excellent thermal, chemical, electrochemical stability, are a kind of promising SPE for highly safe all‐solid‐state LMBs. Nevertheless, the low ambient conductivity of pristine PIL‐based SPE restricts their application in solid‐state LMBs. Herein, an ionic liquid monomer (denoted as GIM) is designed and synthesized and copolymerized with vinyl ethylene carbonate (VEC) monomer by UV‐light curing to prepare P(GIM‐VEC) SPE. The prepared P(GIM‐VEC) SPE is thermally stable and intrinsically nonflammable, possesses high ambient ionic conductivity, and can suppress lithium dendrite growth and stabilize the solid electrolyte interface. Thus, the resultant all‐solid‐state LiFePO 4 (LFP)|P(GIM‐VEC)|Li battery exhibits a high initial discharge capacity of 152.7 mAh g −1 at 0.1 C along with a good stability and rate capability at room temperature. Herein, new guidance is provided for developing ambient workable SPEs with high ionic conductivity, nonflammability, and excellent thermal stability for all‐solid‐state Li metal batteries.
A polycarboxylic/ether composite polymer electrolyte derived from two-arm monomer and polyethylene oxide (PEO) was in situ synthesized on the cathode. The composite electrolyte exhibits a high ionic conductivity of 3.6 × 10-5 S cm-1, high oxidation stability, excellent stability towards Li metal and makes Li/LiFePO4 present good cyclic and rate performance at 25°C.
Cr3+ contained sulfuric acid aqueous solution and β-PbO2/Ti anode were prepared for electrochemical oxidation-distillation desulfurization of straight-run gasoline. Strong oxidant (Cr2O72−) was formed and reacted with organic sulfides. The oxidized sulfides were removed by distillation. Under optimal operating conditions, the desulfurization rate of gasoline reached to 99.16%.β-PbO2/Ti electrode were characterized by XRD and SEM. Model oil was analyzed by FTIR and GC-MS and the possible desulfurization mechanism was proposed. The recycling experiments of the electrolyte showed its excellent stability, but the concentration of H+ in electrolyte should be monitored, since the water will be consumed in electrolysis process, and the over-high H+ concentration is not good for the formation of Cr2O72−.
Sodium sulfide (Na2S) as an initial cathode material in room-temperature sodium-sulfur batteries is conducive to get rid of the dependence on Na-metal anode. However, the micron-sized Na2S that accords with the practical requirements is obstructed due to poor kinetics and severe shuttle effect. Herein, a subtle strategy is proposed via regulating Na2S redeposition behaviours. By the synergistic effect from both conductive structure and cuprous sulfide (Cu2S) catalysis, the micron-sized Na2S particles are broken down and redeposited to nano-size during the initial cycle which can be fully utilized in subsequent cycles. Consequently, the Na2S/CPVP@Cu2S||Na cell delivers excellent cyclability (670 mAh gS−1 after 500 cycles) with a remarkable average Coulombic efficiency over 99.7% and rate capability (480 mAh gS−1 at 4 A gS−1). Besides, the Na-free anodes are used to prove the application prospects. This work provides an innovative idea for utilizing micron-sized Na2S and offers insights into its conversion pathway. Authors report that micron-sized Na2S particles can be self-refinement into nanoparticles during the initial cycle under rapid solid-liquid-solid conversion, which facilitates the development of Na-free anode systems in room-temperature sodium-sulfur batteries.
The composition, structure, reaction mechanism of transition metal-based catalysts and their effects on the electrochemical performance of Li-CO 2 cells were summarized, and some perspectives for the development of Li-CO 2 cells were put forward.
'/%3e%3cuse xlink:href='%23a' transform='rotate(23.036 .093 25.536)'/%3e%3cuse xlink:href='%23a' transform='rotate(45.87 1.273 16.18)'/%3e%3cuse xlink:href='%23a' transform='rotate(69.945 .996 12.078)'/%3e%3cuse xlink:href='%23a' transform='rotate(20.66 -19.689 31.932)'/%3e%3c/svg%3e)