A rambutan-like shell-like 3D lithium-philic composite current collector, lithium metal negative electrode and its preparation and application
A current collector, 3D technology, applied in battery electrodes, lithium batteries, electrode carriers/current collectors, etc., can solve problems such as uneven lithium deposition and uncontrollable growth of lithium dendrites, eliminate volume effects, and reduce apparent current. Effects of density, high coulombic efficiency
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Embodiment 1
[0067] The thickness of the nickel foam current collector is 50 μm, the porosity is 50%, and the pore spacing is 80 μm; the nickel foam is cleaned in absolute ethanol, dried and added to 0.3wt.% HF aqueous solution, and hydrothermally reacted at 100°C for 5 hours , rinsed with deionized water, and dried; then phosphating treatment was carried out using sodium hypophosphite under a mixed flow of hydrogen and argon at 180ml / min, the heating rate of phosphating treatment was 1°C / min, and the temperature of phosphating treatment was 350°C. The time is 2 hours, and the rambutan-like shell-like 3D lithium-philic nickel composite current collector is prepared.
[0068] The prepared rambutan-like shell-like 3D lithiophilic nickel composite current collector was used as the working electrode, the metal lithium sheet was used as the counter electrode, and 1M LiTFSI / DOL:DME (volume ratio = 1:1) containing 1wt.% LiNO 3 Coin cell assembly, lithium deposition test and charge-discharge cycle...
Embodiment 2
[0072] The thickness of the copper foam current collector is 60 μm, the porosity is 45%, and the pore spacing is 90 μm; the copper foam is cleaned in absolute ethanol, dried and added to 0.4wt.% HF aqueous solution, and hydrothermally reacted at 120 ° C for 6 hours , rinsed with deionized water, and dried; then, phosphating treatment was carried out using sodium hypophosphite under a mixed flow of hydrogen and argon at 160ml / min. The heating rate of phosphating treatment was 1°C / min, and the temperature of phosphating treatment was 400°C. The time is 3 hours, and the rambutan-like shell-like 3D lithium-philic copper composite current collector is prepared. The thickness of the base layer is 3.8 μm, and the base is covered with nano-scale Ni 2 P spikes (nanowires) with an average length of 5.7 μm and an average diameter of 90 nm.
[0073] The prepared rambutan-like shell-like 3D lithium-ophilic copper composite current collector was used as the working electrode, and the metal...
Embodiment 3
[0076]The thickness of the titanium foam current collector is 40 μm, the porosity is 40%, and the pore spacing is 70 μm; the titanium foam is cleaned in absolute ethanol, dried and added to 0.5wt.% HF aqueous solution, and hydrothermally reacted at 100 ° C for 4 hours , rinsed with deionized water, and dried; then phosphating treatment was carried out using sodium hypophosphite under the mixed flow of hydrogen and argon at 200ml / min, the heating rate of phosphating treatment was 2°C / min, and the temperature of phosphating treatment was 350°C. The time is 2 hours, and the rambutan-like shell-like 3D lithium-ophilic titanium composite current collector is prepared. The thickness of the base layer is 4.9 μm, and the base is covered with nano-scale Ni 2 P spikes (nanowires) with an average length of 4.8 μm and an average diameter of 87 nm.
[0077] The prepared rambutan-like shell-like 3D lithiophilic titanium composite current collector was used as the working electrode, the met...
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