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A kind of preparation method of lithium metal interface modification layer
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An interface modification layer, lithium metal technology, applied in coatings, electrode manufacturing, electrode current collector coatings, etc., can solve the problem that it is easily soluble in organic solvents or monomers, and lithium metal has high reactivity and is difficult to inhibit lithium branching. Crystal and other problems, to achieve the effect of improving density and Young's modulus, good mechanical properties, and inhibiting expansion
Active Publication Date: 2022-03-25
SAIC MOTOR
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However, this type of PDMS has a linear structure, poor mechanical properties, and it is difficult to suppress the formation of lithium dendrites.
[0004] In summary, the current lithium metal polymer interface modification layer has the disadvantages of being easily soluble in organic solvents or monomers, poor mechanical properties, high reactivity with lithium metal, and easy to cause pollution.
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[0025] The invention provides a method for preparing a lithium metal interface modification layer, comprising:
[0026] The compound of the formula (I) structure and the catalyst are mixed with a solvent containing a lithium salt, and stirred to obtain a mixed solution;
[0027] Coating the mixed solution on the lithium foil and heat-treating to obtain a lithium metal interface modification layer;
[0028]
[0029] Among them, x is 28~45, R 1 , R 2 are independently selected from C1-C10 alkyl groups.
[0030] The preparation method of the lithium metal interface modification layer provided by the present invention first mixes the compound of formula (I) and the catalyst with a solvent containing lithium salt.
[0031] The compound of formula (I) structure of the present invention is specifically:
[0032]
[0033] Wherein, x is 28-45, preferably 28-42, more preferably 28-32; R 1 , R 2 Independently selected from C1-C10 alkyl groups; preferably C1-C8 alkyl groups; m...
Embodiment 1
[0058] Add 1.5 g PMHS to 3 g containing 5 wt% LiNO 3 In DME, stirred at room temperature for 30 min, the solution was coated on a 50 μm thick metal lithium foil by scraping, and then heat-treated at 80 °C for 8 h to obtain a polymer-modified lithium metal negative electrode. Among the compounds of formula (I) structure: R1 is CH 3 , R2 is CH 3 , x is 38.
[0059] Assemble a ternary solid-state soft pack battery with a cycle current density of 1mA / cm 2 , deposition capacity 4mAh / cm 2 , battery cycle 32@90%, reference battery cycle 12@80%. attached Figure 1-Figure 3 .
Embodiment 2
[0061] Add 1.5g PMHS to 3g DMC containing 5wt% LiF, stir at room temperature for 30min, apply the solution to a 50μm thick metal lithium foil by scraping, and then heat-treat at 80°C for 10h to obtain a polymer-modified lithium metal anode.
[0062] Assemble a ternary solid-state soft pack battery with a cycle current density of 1mA / cm 2 , deposition capacity 4mAh / cm 2 , battery cycle 40@90%, reference battery cycle 12@80%.
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Abstract
The invention provides a method for preparing a lithiummetal interface modification layer, comprising: mixing a compound of formula (I) and a catalyst with a solvent containing lithium salt, stirring to obtain a mixed solution; coating the mixed solution on a lithium foil, heat treatment to obtain a lithium metal interface modification layer. The siloxanepolymer with the structure of formula (I) of the present invention is insoluble in electrolyte solution and small moleculemonomer, and can weaken the reaction between solidelectrolyte and lithium metal; the polymer is cross-linked and polymerized under the action of a catalyst to form a network structure, It can inhibit the expansion of lithium metal and has good mechanical properties. At the same time, the polymer backbone is Si-O group, which is chemically stable and will not react with lithium metal. Lithium salts will form LiN, LiF and other substances on the surface of metal lithium to increase the density and Young's modulus of the modified layer.
Description
technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a preparation method of a lithium metal interface modification layer. Background technique [0002] Lithium metal has become an important choice for the anode of high specific energy lithium batteries in the future because of its high specific capacity (3860mAh / g) and low electrochemical potential. However, the high reactivity of lithium metal makes the SEI formed with the electrolyte unstable, and the volume expansion during lithium deposition and stripping will destroy the SEI (solid electrolyte interphase), form dead lithium, and lead to further consumption of the electrolyte. A modified layer is constructed on the lithium metal interface to form an artificial SEI, which can improve lithium deposition macroscopically. At the same time, the interface modified layer can isolate the electrolyte to a certain extent and reduce the harmful reaction between the electrol...
Claims
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