Composite metal lithium negative electrode, preparation method and metal lithium battery
A technology of composite metal and lithium negative electrode, which is applied in the direction of lithium battery, battery electrode, electrode carrier/current collector, etc., to reduce the average current density, prolong the cycle life, and alleviate the volume expansion.
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[0037] Example 1
[0038] Add 0.75g polyvinylpyrrolidone (K30) and 2.5mL concentrated hydrochloric acid to 30mL methanol and stir well. Immerse the nickel foam in the above solution, sonicate it for 30 minutes, wash with water and methanol, and then use it for later use. Add 1.2 g of zinc nitrate hexahydrate and 1 g of 2-methylimidazole to 30 mL of methanol, and stir to dissolve. Immerse the pretreated nickel foam in the above solution, let it stand at room temperature for 6 hours, wash it with methanol, and dry it naturally. The coated nickel foam was calcined at 600°C for 3h in an argon atmosphere, and the heating rate was 5°C / min.
[0039] The scanning electron micrograph of the composite substrate material prepared above is as follows figure 1 Shown. It can be seen that the coating layer is well dispersed on the three-dimensional current collector frame, and the particle size is uniform.
[0040] The transmission electron micrograph of the coating layer of the composite base ...
Example Embodiment
[0044] Example 2
[0045] Add 0.75g polyvinylpyrrolidone (K30) and 2.5mL concentrated hydrochloric acid to 30mL methanol and stir well. Immerse the nickel foam in the above solution, sonicate it for 30 minutes, wash with water and methanol and then use it for later use. Add 1.2 g of cobalt nitrate hexahydrate and 1 g of adipic acid into 30 mL of methanol, and stir to dissolve. The pretreated nickel foam was immersed in the above solution, left standing at room temperature for 6 hours, washed with methanol, and dried naturally. The coated nickel foam was calcined at 600°C for 3h in an argon atmosphere, and the heating rate was 5°C / min.
[0046] The above-mentioned coated and calcined foamed nickel is used as the positive electrode, and the metal lithium sheet is used as the negative electrode to assemble a half-cell, and the metal lithium is deposited on the substrate by electrochemical deposition. The electrolyte of the battery is a solution of ethylene glycol dimethyl ether and...
Example Embodiment
[0047] Example 3
[0048] Imitated Example 1, except that 2-methylimidazole was replaced with terephthalic acid. Deposit two pieces of 10mAh / cm 2 The lithium metal composite negative electrode is used as the two poles of the battery to assemble a symmetrical battery. The battery electrolyte is ethylene glycol dimethyl ether containing 1mol / L trifluoromethanesulfonimide lithium and 1,3-dioxolane (volume ratio 1:1) Solution. The charge-discharge cycle test is carried out at a current density of 2mA / cm2, and the amount of circulating lithium is 1mAh / cm 2 .
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