A carbon structure current collector, battery negative pole, battery positive pole and lithium battery
A technology of battery negative electrode and battery positive electrode, applied in the field of electrochemical power supply, can solve the problems of poor cycle performance of lithium ion battery, repeated consumption of electrolyte, and lower utilization rate of negative electrode, achieve high energy density, avoid tip effect, and inhibit growth. Effect
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Embodiment 1
[0086] Put nickel foam into a high temperature tube furnace, under Ar (400sccm) and H 2 (50sccm) under the mixed gas flow, the temperature is raised to 1050°C under normal pressure conditions, and then annealed at 1050°C for 30 minutes; CH is passed into the foamed nickel after annealing 4 (50sccm) 5 minutes, then cool to room temperature with the speed of 10 ℃ / min in the atmosphere of Ar (400sccm), deposit graphene in nickel foam; Remove nickel from the electrolytic solution of nickel, and electrolyze for 10 minutes under the constant voltage mode of 2.2V. After the electrolysis is complete, rinse the obtained electrolysis product with deionized water and ethanol several times, and dry it in an oven at 50°C. Obtain foam graphite.
[0087] The graphite foam prepared by the embodiment of the present invention 1 is observed, and the results are as follows figure 1 as shown, figure 1 It is a picture of the graphite foam prepared in Example 1 of the present invention.
[0088]...
Embodiment 2
[0090] The graphite foam prepared in Example 1 is put into a small-sized ion sputtering apparatus, the pressure in the chamber of the ion sputtering apparatus is controlled to be 4Pa, the current is 15mA, and the deposition time is 300s, and a layer of ion sputtering is made on the surface of the graphite foam. Fe was used as a catalyst to obtain a catalyst layer.
[0091] Put the catalyst layer into the atomic layer deposition (ALD) equipment, adjust the ALD equipment, the chamber temperature is set to 250 ° C, the intake manifold temperature is set to 110 ° C, Al(CH 3 ) 3 The precursor was kept at room temperature, and Al(CH 3 ) 3 (100ms) until Al(CH 3 ) 3 Completely react with all sites on the foamed graphite, and then use high-purity N 2 (5min) purge the remaining foamed graphite and reactants, and then pulse enough H 2 O (100ms) enters the ALD cavity to make it react with the reaction product in the cavity, and Al grows uniformly on the surface of the foamed graphit...
Embodiment 3
[0098] Electrochemical deposition method at 0.5mA cm -2 A current density of 100% is deposited on the surface of the carbon structure current collector prepared in Example 2 to obtain a battery negative electrode. The specific method is:
[0099] The carbon-containing structure current collector is used as the cathode, and the metal lithium sheet is used as the anode, which is assembled into a button battery or an electrolytic cell, and lithium bis(trifluoromethylsulfonyl)imide is used as the electrolyte, and the solvent can be various commonly used lithium ions Solvents used in batteries, such as 1,3-dioxolane, 1,2-dimethoxyethane, ethylene carbonate and diethyl carbonate, etc. Using the method of constant current discharge, electrodeposit 10mAh cm on the surface of carbon steel current collector -2 Lithium metal to obtain the negative electrode of the battery.
[0100] Observing the battery negative electrode prepared in Example 3, the results are as follows image 3 as s...
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Abstract
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