Ionic liquid-based ether lithium metal battery electrolyte as well as preparation method and application thereof
A lithium metal battery and ionic liquid technology, applied in lithium batteries, electrolytes, secondary batteries, etc., can solve the problems of high industrial production costs, shorten the life of LMBs, consume lithium and electrolyte, etc., and achieve stable polarizability, good Cycling performance and safety, and the effect of inhibiting the growth of lithium dendrites
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[0043] The preparation method provided by the invention only needs to be prepared in anaerobic and anhydrous (O 2 / H 2 (0<0.1ppm) environment, stirring and mixing does not require complex synthesis conditions, which is conducive to reducing industrial production costs.
[0044] In some examples of this embodiment, the manufacturing process is done in a glove box.
[0045] Specifically, the following steps are included:
[0046] (1) Prepared ether solvent: at room temperature, mix 1,2-dimethoxyethane (DME) and 1,3-dioxolane (DOL) in a glove box and obtain a DME / DOL solution uniformly ;
[0047] (2) Add the solute of the electrolyte: in the glove box, under the condition of constant stirring, the LiTFSI powder is added to the DME / DOL solution obtained in step (1), and continue to stir to form a uniformly mixed solution;
[0048] (3) Add electrolyte additive: add [PMP][FSI] and VC to the mixed solution obtained in step (2), and stir until the electrolyte is evenly mixed.
Embodiment approach
[0049] The third embodiment of the present invention provides an application of the above-mentioned ionic liquid-based ether lithium metal battery electrolyte in lithium metal batteries.
[0050] The fourth embodiment of the present invention provides a lithium metal battery, including a positive electrode, a negative electrode, a separator, and an electrolyte, and the electrolyte is the above-mentioned ionic liquid-based ether lithium metal battery electrolyte.
[0051] In some examples of this embodiment, the positive electrode material in the positive electrode is lithium iron phosphate (LFP). Specifically, the preparation process of the positive electrode is: mix the positive electrode material with a binder (such as polyvinylidene fluoride (PVDF), etc.), a conductive agent (such as SuperP conductive agent, etc.), and then add a solvent (such as N-methylpyrrolidone ( NMP) etc.) are mixed uniformly to obtain a slurry, and the slurry is coated on a current collector (such as...
Embodiment 1
[0054] (1) In a glove box with a high-purity argon atmosphere at room temperature, add 4.2879ml of DME and 4.2879ml of DOL to a glass vial with a pipette gun, put into a rotor and seal the vial, and stir magnetically for 30 minutes.
[0055] (2) Weigh 2.462g of LiTFSI powder with an analytical balance in the glove box, then add it into the solution obtained in step (1), seal it and stir it magnetically for 30 minutes to obtain an additive-free electrolyte.
[0056] (3) Weigh 0.8g LFP, 0.1g PVDF, 0.1g Super P into the ball mill tank at room temperature, then add 2.5g NMP solvent, put it into the ball mill and grind it at a speed of 400r / min for more than 2 hours to form a uniformly mixed and moderately viscous slurry .
[0057] (4) The slurry obtained in step (3) is uniformly poured on the aluminum foil with a thickness of 22 μm by an automatic coating machine, and after vacuum drying at 60 ° C for 12 hours, it is rolled by a roller press and sliced by a slicer to obtain a di...
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