Three-dimensional current collector for inhibiting lithium metal negative electrode dendrites and application of three-dimensional current collector in metal lithium battery
A lithium metal negative electrode and current collector technology, which is applied in the direction of lithium batteries, electrode carriers/current collectors, battery electrodes, etc., can solve the problems of large mass and thick volume, achieve the effect of light weight, small volume, and promote uniform deposition
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Embodiment 1
[0024] This example describes the morphology of copper nanocone arrays.
[0025] Commercial copper foils were used with 0.5M H 2 SO 4 , acetone, and absolute ethanol for half an hour, and rinsed with ultrapure water.
[0026] Electrolyte preparation: add 100mL ultrapure water to a beaker, add 0.75g CuSO 4 ·5H 2 O, 0.063gNiSO 4 ·6H 2 O, 2.112g NaH 2 PO 2 , 1.47 g Na 3 C 6 h 5 o 7 , 3.09 g H 3 BO 3 and 0.6g PEG to obtain a blue transparent mixed solution, and then adjust the pH to 8.0 with NaOH.
[0027] The pretreated copper foil is used as the working electrode, the Pt sheet is used as the counter electrode, and the saturated Ag / AgCl electrode is used as the reference electrode, and the electrochemical workstation is used for constant voltage electrodeposition. The setting conditions are: -1.12V voltage, heating at 75°C While stirring, the deposition time is 1800s, and the rotation speed is 150rmin -1 , soak the deposited copper foil in 0.1M H 2 SO 4 1h, rinse...
Embodiment 2
[0030] This example describes the morphology of Cu@Sn nanocones.
[0031] The preparation of the copper nanocone array is the same as in Example 1, the difference is that 0.55g CuSO was added to 100mL ultrapure water 4 ·5H 2 O, 0.046g NiSO 4 ·6H 2 O, 1.86 g NaH 2 PO 2 , 1.04 g Na 3 C 6 h5 o 7 , 2.78 g H 3 BO 3 And 0.3gPEG, adjust the pH to 8.5 with NaOH.
[0032] Electrolyte preparation: add 100mL ultrapure water to a beaker, add 8.0g NaOH, 2.941g NaOH 3 C 6 h 5 o 7 and 1.0735g SnSO 4 , after stirring evenly, a mixed solution was prepared,
[0033] Cu nanocone was used as working electrode, Pt sheet was used as counter electrode, saturated Ag / AgCl electrode was used as reference electrode, and electrochemical workstation was used at 3.3mAcm -2 Constant current electrodeposition was carried out under the conditions of current density and stirring, the deposition time was 20s, and the rotation speed was 150rmin -1 After the deposition is completed, rinse with ul...
Embodiment 3
[0036] This example explores the deposition morphology of lithium on Cu@Sn nanocones
[0037] With lithium foil as the negative electrode, 1M LiTFSI DOL / DME (volume ratio 1:1) + 1% LiNO 3 As the electrolyte, Celgard2400 as the separator, Cu@Sn nanocone prepared on the basis of Example 1 as the positive electrode, assemble the half-cell in an argon glove box, at 1mA cm -2 After discharging at a current density for 2 h, the battery was disassembled in an argon glove box, and the surface of the Cu@Sn nanocone electrode was rinsed with dimethyl ether (DME), dried and then subjected to SEM testing.
[0038] image 3 The deposition capacity of lithium on the Cu@Sn nano cone in Example 3 is 2mAh cm -2 shape at the time. The three-dimensional nanocone structure makes the electric field distribution more uniform, the charge distribution is relatively uniform, the lithium deposition is more uniform, and the dendritic morphology is not observed on the surface, forming a relatively fla...
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