The coupling of lithium metal (Li), an ester electrolyte, and high voltage cathode materials is expected to realize rechargeable batteries with high energy densities. Herein, a "cationic size effect" is first demonstrated to promote the dissolution of NO 3 − in an ester electrolyte and a SEI layer containing Li 3 N is constructed. By adjusting the size of quaternary ammonium (R 4 N + ), the charge localization state of R 4 N + and the binding energy between R 4 N + and NO 3 − are regulated, achieving a high solubility (1.8 M) of tetraethylammonium nitrate (TEAN) in ethylene carbonate. Using TEAN as an ester electrolyte additive, the Li/Cu batteries can stably run over 1000 h with an average CE of 98.6%, 8 times longer than that of a conventional ester electrolyte. Moreover, the cyclic life of assembled Li/LiFePO 4 and Li/NCM811 batteries can also be increased by 3−4 times.
The construction of high sulfur (S) loading cathode is one of the critical parameters to obtain lithium–sulfur (Li–S) batteries with high energy density, but the slow redox reaction rate of high S loading cathode limits the development process. In this paper, a metal coordinated polymer‐based three‐dimensional network binder, which can improve the reaction rate and stability of S electrode. Compared with traditional linear polymer binders, the metal coordinated polymer binder can not only increase the load amount of S through the three‐dimensional cross‐linking, but also promote the interconversion reactions between S and lithium sulfide (Li2S), avoiding the passivation of electrode and improving the stability of the positive electrode. At an S load of 4–5 mg cm−2 and an E/S ratio of 5.5 µL mg−1, the discharged voltage in the second platform is 2.04 V and the initial capacity is 938 mA h g−1 with metal coordinated polymer binder. Moreover, the capacity retention rate approaches 87% after 100 cycles. In comparison, the discharged voltage in the second platform is lost and the initial capacity is 347 mA h g−1 with PVDF binder. It demonstrates the advanced properties of metal‐coordinated polymer binders for improving the performance of Li–S batteries.
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