A kind of preparation method of secondary lithium metal battery negative electrode vapor protection film
A lithium metal battery and lithium metal negative electrode technology, which is applied in secondary battery repair/maintenance, secondary batteries, battery electrodes, etc., can solve problems such as difficult control and low efficiency, and achieve convenient operation, small overpotential, and long cycle The effect of longevity
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Embodiment 1
[0037] Operation process such as figure 1 ,
[0038] a CS 2 -I 2 Lithium anode with vapor protection film (CS 2 -I 2 -Li), which is prepared by the following steps:
[0039] Take carbon disulfide and elemental iodine with a mass ratio of 20:1, mix them evenly to prepare a precursor solution, and add them into a closed container connected with a steam pipe. The closed container is heated to generate steam, and the steam enters the reaction container through the pipeline. The lithium ribbon is wound into a roll, and the unrolled portion of the roll is continuously passed through the reaction vessel so that the incoming vapor flow is perpendicular to one side of the lithium ribbon. By controlling the passing speed of the lithium ribbon, the contact time of the lithium ribbon with steam is controlled to be 0.5h. The side of the lithium material that is facing the steam flow reacts with the steam, and the other side does not react. The above equipment and the lithium belt w...
Embodiment 2
[0047] a kind of I 2 Lithium anode with vapor protection film (I 2 -Li), its preparation method is basically the same as that of Example 1, except that elemental iodine is used as a precursor, and carbon disulfide is not added, and it is added into a closed container.
[0048] For income I 2 -Characterize the electrochemical performance of Li electrode, the results can be found in Figure 4 . Symmetrical cell tests show that I 2 -Li composite electrode at 1mA / cm 2 Charge-discharge cycle under the current density, the overpotential showed a trend of decreasing first and then increasing, the initial overpotential was 130mV, and the overpotential increased to 170mV after 300 cycles.
Embodiment 3
[0050] a CS 2 Lithium anode with vapor protection film (CS 2 -Li), its preparation method is basically the same as embodiment 1. The difference is that only a solvent such as carbon disulfide is added in a closed container, and no precursor is added.
[0051] to the resulting CS 2 -Characterize the electrochemical performance of Li electrode, the results can be found in Figure 4 . Symmetrical cell tests show that CS 2 -Li electrode at 1mA / cm 2 The charge-discharge cycle was carried out under the current density, and the initial overpotential was 80mV, which increased to 130mV after 100 cycles, and then the potential rapidly increased to more than 400mV, and then a short circuit occurred, and the potential stabilized at about 10mV.
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