Method for carrying out surface protection and passivation treatment on metal lithium negative electrode by utilizing fluorine-containing organic matter, product and application
A technology of passivation treatment and organic matter, applied in the field of electrochemistry, can solve problems such as poor electrochemical stability and insufficient mechanical strength of the protective layer, and achieve the effect of improving cycle life
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Embodiment 1
[0035] Such as figure 1 , 2 Shown, a kind of method that utilizes fluorine-containing organic matter to carry out metal lithium negative electrode surface protection and passivation treatment, its steps are as follows:
[0036] (1) Add 0.2 mL of tetrahydrofuran solution of n-butyl heptafluorobutyrate into a small container, and soak the lithium tablet in it for 8 seconds;
[0037] (2) Take out the lithium sheet, and drain the residual liquid on the lithium sheet with a dust-free paper.
[0038] Such as figure 2 As shown, the symmetric battery performance test of fluorine-protected lithium:
[0039] (1) Use lithium protected by fluorine-containing organic substances on both sides of the diaphragm, add an appropriate amount of 1M LiTFSI DOL / DME electrolyte, and assemble the battery;
[0040] (2) The impedance of the symmetrical battery is tested in the electrochemical workstation, and the constant current charge and discharge test is performed in the blue electric battery t...
Embodiment 2
[0050] A lithium negative electrode, the preparation method of which is as follows:
[0051] (1) Add 0.3mL of perfluorobutylsulfonyl fluoride into a small container, soak the lithium slice in it for 5s;
[0052] (2) Take out the lithium sheet, and drain the residual liquid on the lithium sheet with dust-free paper to obtain a lithium negative electrode with a fluorine-containing organic protection layer.
Embodiment 3
[0054] A lithium negative electrode, the preparation method of which is as follows:
[0055] (1) Add 0.1 mL of ethanol solution of ethyl fluoroacetate to a small container, and soak the lithium slice in it for 30 seconds;
[0056] (2) Take out the lithium sheet, and drain the residual liquid on the lithium sheet with dust-free paper to obtain a lithium negative electrode with a fluorine-containing organic protection layer.
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