Method for modifying negative current collector in negative-electrode-free alkali metal ion battery
A technology of alkali metal ions and current collectors, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve problems such as attenuation, poor stability of SEI film, electrolyte consumption of battery performance, etc., to enhance stability, inhibit branching, etc. Crystal growth, the effect of improving electrochemical performance
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[0015] A method for modifying negative current collectors in an anode-free alkali metal ion battery, comprising the following steps:
[0016] Step 1. Pickling the negative electrode current collector to remove surface oxides, and then carry out partial surface oxidation treatment with hot air to form M on the surface of the negative electrode current collector. x o y nanowires, and then dilute H 2 SO 4 , NaOH are soaked sequentially to get the surface containing M n (OH) m The negative electrode current collector of the nanowire; wherein the negative electrode current collector is copper foil or aluminum foil, correspondingly, M is Cu or Al, and x, y, n, m are selected according to the principle of balancing the valence;
[0017] Step 2. Mix the silane coupling agent and the organic solvent uniformly in a certain volume ratio to obtain a mixed solution, and mix the surface containing M n (OH) m The negative electrode current collector of the nanowire is placed in the abo...
Embodiment 1
[0028] A method for modifying a negative electrode current collector in an anode-free lithium ion battery, comprising the following steps:
[0029] Step 1. First soak the copper foil with hydrochloric acid with a concentration of 2mol / L to remove surface oxides, then place the copper foil in a tube furnace to raise the temperature to 250°C at a heating rate of 4°C / min, and continue to introduce air , kept for 3 hours and then cooled down to room temperature naturally, CuO nanowires were formed on the copper substrate, and then diluted with H at a concentration of 3mol / L 2 SO 4 , 1mol / LNaOH are soaked in turn to get Cu(OH) on the surface 2 Copper foil for nanowires.
[0030] Step 2. Mix vinyltriethoxysilane (KH-151) containing double bond functional groups with tetrahydrofuran at a volume ratio of 5% vol / 95% vol to obtain a mixed solution. The surface contains Cu(OH) 2 The copper foil of the nanowire is placed in the mixed solution for soaking treatment for 40 minutes. Afte...
Embodiment 2
[0033] A method for modifying the negative electrode current collector in a negative electrode sodium ion battery, comprising the following steps:
[0034] Step 1. First soak the aluminum foil with hydrochloric acid with a concentration of 3mol / L to remove surface oxides, then place the aluminum foil in a tube furnace to raise the temperature to 300°C at a heating rate of 5°C / min, and continue to supply air to keep After 3h, it naturally cooled down to room temperature, forming Al on the aluminum substrate. 2 o 3 nanowires, and then dilute H with a concentration of 4mol / L 2 SO 4 , 2mol / LNaOH are soaked in sequence to obtain the surface containing Al(OH) 3 Aluminum foil for nanowires.
[0035] Step 2. Mix vinyltris(b-methoxyethoxy)silane (KH-172) and tetrahydrofuran containing double bond functional groups uniformly at a volume ratio of 3%vol / 97%vol to obtain a mixed solution. The surface contains Al(OH) 3 The aluminum foil of the nanowire is placed in the mixed solution ...
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