Preparation method of lithium ion battery solid electrolyte interphase, and lithium ion battery
A solid electrolyte membrane, lithium ion battery technology, applied in non-aqueous electrolyte storage batteries, electrolyte storage battery manufacturing, secondary batteries, etc. Discharge efficiency and other issues, to achieve the effect of good transmission of lithium ions and insulation of electronics, good cycle performance and storage performance, and improved first charge and discharge efficiency
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[0015] The invention provides a method for preparing a solid electrolyte membrane of a lithium ion battery, which includes the following steps:
[0016] Step 1: Preparation of negative electrode homogenate: weigh graphite, conductive agent and binder according to a certain mass ratio, then add deionized water, and use a mechanical stirring disperser to disperse the negative electrode homogenate;
[0017] Step 2: Preparation of organic solution electroplating cell: weigh the lithium salt, organic solvent and additives according to a certain mass ratio to prepare an organic solvent electrolytic cell;
[0018] Step 3: After sieving the negative electrode homogenate in step 1, evenly coat it on the surface of the current collector copper foil and dry it to make a primary negative electrode sheet; and
[0019] Step 4: Immerse the primary negative electrode sheet obtained in step 3 into the organic solution electroplating bath described in step 2, electroplating a layer of organic film on th...
Example Embodiment
[0028] Example 1:
[0029] 1) Preparation of negative electrode homogenate: Weigh 94% natural graphite, 2.5% SP, 1.5% CMC, 2% SBR according to a certain dry powder quality, first dissolve CMC in deionized water to prepare a glue solution, and then add SP and natural graphite in sequence And SBR, using a mechanical stirring and dispersing machine to disperse the negative electrode homogenate, the solid content of the negative electrode homogenate is 45%-55%, and the viscosity is 600-1500mPa.s;
[0030] 2) Preparation of organic solution electroplating bath: weigh the lithium salt LiBOB:LiPF according to a certain mass ratio 6 :LiBF 4 :LiAsF 6 =1:1:0.5:0.5, the total mass of lithium salt accounts for 13% of the mass of the organic solution electroplating bath; according to the mass ratio of 1:1:1, weigh the EC, DMC, EMC organic solvents, and the total organic solvents The mass accounts for 85% of the mass of the organic solution electroplating bath; the VC, LiODFB, HDMS, TTFP, BP add...
Example Embodiment
[0033] Example 2:
[0034] 1) Preparation of negative electrode homogenate: Weigh 94% natural graphite, 2.5% SP, 1.5% CMC, 2% SBR according to a certain dry powder quality, first dissolve CMC in deionized water to prepare a glue solution, and then add SP and natural graphite in sequence And SBR, using a mechanical stirring and dispersing machine to disperse the negative electrode homogenate, the solid content of the negative electrode homogenate is 45%-55%, and the viscosity is 600-1500mPa.s;
[0035] 2) Preparation of organic solution electroplating bath: weigh the lithium salt LiBOB:LiPF according to a certain mass ratio 6 :LiBF 4 = 1:2:0.5, the total mass of lithium salt accounts for 14% of the mass of the organic solution electroplating bath; according to the mass ratio of 0.5:0.5:1:1, weigh the EC, PC, DMC, EMC organic solvents, the total The mass of organic solvent accounts for 84.5% of the mass of the organic solution electroplating bath; the VC, LiODFB, HDMS, and BP additiv...
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