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

Inactive Publication Date: 2018-03-06

OPTIMUM BATTERY CO LTD

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AI-Extracted Technical Summary

Problems solved by technology

[0003] However, in the traditional chemical formation process, the formation of the SEI film consumes part of the lithium ions, which increases the irreversible capacity of the first charge and discharge, reduces the first charge and discharge efficiency of the electrode material, the utilization rate of the positive and negative electrode materials is low, and the battery manufacturing cost increases accordingly; At the same ...

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Method used

Fig. 2 is the 3C cycle contrast figure of the battery of comparative case and the battery of the embodiment of the present invention, as can be seen from Fig. 2: the cycle performance of embodiment 1, embodiment 2 and embodiment 3 is obviously better than comparative case, The reason is that the SEI film is produced by pre-electroplating, which reduces the adverse effect on the battery of the gas generated by the reaction between the electrolyte and the electrolyte during the formation of the battery.

The preparation method of lithium-ion battery solid electrolyte membrane provided by the invention, by electroplating one deck SEI film in advance on negative electrode sheet, has redu...

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Abstract

Disclosed is a preparation method of a lithium ion battery solid electrolyte interphase. The preparation method comprises the following steps of 1, preparation of negative electrode uniform paste: weighing graphite, a conductive agent and a binder based on a certain mass ratio, then adding deionized water, and performing dispersion on the negative electrode uniform paste by a mechanical stirring disperser; 2, preparation of an organic solution electroplating tank: weighing a lithium salt, an organic solvent and an additive based on a certain mass ratio, and preparing an organic solvent electrolytic tank; 3, performing screening on the negative electrode uniform paste obtained in the step 1 and the coating the surface of a current collector copper foil with the screened negative electrode uniform paste, and then performing drying to prepare a primary negative electrode plate; and 4, enabling the primary negative electrode plate obtained in the step 3 to be immersed into the organic solution electroplating tank obtained in the step 2, and electroplating the primary negative electrode plate with a layer of organic film at a low current, and finally taking out and performing drying. The invention also provides the lithium ion battery, wherein the lithium ion battery is prepared by the working procedures of rolling, plate making, assembling, electrolyte injecting and sealing on thenegative electrode plate of the solid electrolyte interphase prepared by the steps 1-4, and a diaphragm, a positive electrode plate and an electrolyte.

Application Domain

Final product manufactureElectrolyte accumulators manufacture

Technology Topic

Copper foilCurrent collector +13

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Examples

Experimental program(4)

Example Embodiment

[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 the primary negative electrode sheet with a small current, and then take it out and dry it.

[0020] Specifically, the graphite in the step 1 is one or more of natural graphite, artificial graphite, composite graphite, soft carbon and hard carbon. The conductive agent is conductive graphite. The adhesive is one of LA133, CMC, and SBR water-based adhesives. The mass ratio of the graphite is 90%-95%, the mass ratio of the conductive agent is 1%-4%, and the mass ratio of the binder is 2%-6%.

[0021] Specifically, the conductive graphite is one of SP, KS, ECP, CNT, and VGCF.

[0022] Specifically, the solid content of the negative electrode homogenate in the step 1 is 45%-55%, and the viscosity is 600-1500 mPa·s.

[0023] Specifically, the lithium salt in step 2 is LiClO 4 , LiAsF 6 , LiBF 4 , LiPF 6 , LiN(CF 3 SO 2 ) 2 , LiCF 3 SO 3 , One or more of LiBOB. The solvent is one or more of EC, PC, BC, DMC, EMC, DEC, GBL, EA, PA, EP, THF, and DME. The additives are one or more of VC, FEC, PS, LiODFB, HDMS, TTFP, and BP. The mass ratio of the lithium salt is 10% to 15%, the mass ratio of the solvent is 84% to 88%, and the mass ratio of the additive is 1% to 3%.

[0024] The present invention also provides a lithium-ion battery, which is made up of the negative electrode sheet and the separator, the positive electrode sheet and the electrolyte with the solid electrolyte membrane made in the above steps 1 to 4 through the steps of roller, sheet making, assembly, liquid injection, and sealing. production.

[0025] Comparative case:

[0026] 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;

[0027] 2) After the negative electrode homogenate is sieved, it is evenly coated on the surface of the current collector copper foil and dried.

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 additives are weighed at a mass ratio of 1:1:1:1:1, and the total organic additive mass accounts for the organic 2% of the mass of the solution plating bath;

[0031] 3) After the negative electrode homogenate is sieved, it is evenly coated on the surface of the current collector copper foil and dried to form a primary negative electrode sheet;

[0032] 4) Immerse the primary negative plate in the organic solution electroplating bath. The primary negative plate is connected to the negative electrode of the electroplating cell power supply, and the positive electrode of the power supply is connected to a lithium plate or a lithium salt with a removable structure that can provide a lithium source. The electric current electroplates a layer of organic film on the primary negative plate, and finally takes it out for drying.

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 additives are weighed at a mass ratio of 1:1:1:1, and the total mass of organic additives accounts for the organic solution electroplating 85% of the pool quality;

[0036] 3) After the negative electrode homogenate is sieved, it is evenly coated on the surface of the current collector copper foil and dried to form a primary negative electrode sheet;

[0037] 4) Immerse the primary negative plate in the organic solution electroplating bath, connect the primary negative plate to the negative electrode of the electroplating cell power supply, and connect the positive electrode of the power supply to a lithium plate or a lithium salt with a removable structure that can provide a lithium source. The electric current electroplates a layer of organic film on the primary negative electrode sheet, and finally takes it out for drying.

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PUM

Property	Measurement	Unit
Viscosity	600.0 ~ 1500.0	mPa·s
tensile		MPa
Particle size		Pa
strength	10

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Avoid adverse effects
Improve the first charge and discharge efficiency

Preparation method of lithium ion battery solid electrolyte interphase, and lithium ion battery

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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