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Composite separator membrane, preparation method thereof, and application thereof in lithium ion batteries

A composite diaphragm and lithium-ion technology, applied in secondary batteries, battery components, circuits, etc., can solve the problems of high-speed charging/discharging performance damage, battery performance degradation, and no positive improvement, etc., to achieve excellent Effects of charge/discharge characteristics, improvement of battery safety, and reduction of short-circuit phenomena

Inactive Publication Date: 2016-10-05
ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The use of separators with inorganic particles (such as alumina, zirconium oxides, titanium oxides, etc. non-lithium ion conductors) as fillers acts to prevent heat shrinkage and can improve the safety of the battery, but the battery tends to exhibit poor charging / discharge characteristics
Especially when the battery is charged and discharged at a relatively large current, the performance of the battery is significantly reduced in a low-temperature environment. This is because the porous membrane is densely filled with inorganic particles. Therefore, the inorganic filler particles not only have no positive effect on the lithium-ion battery. The effect of improving, and the non-lithium ion conductor oxide has the possibility of blocking the rapid migration of lithium ions, so that the high-speed charging / discharging characteristics of lithium-ion batteries are impaired, and it cannot be charged / discharged in a low temperature environment
[0005] The publication numbers are CN103296235A and CN103236511A patent applications, both of which use inorganic oxide non-lithium ion conductors as the diaphragm material. The increase in the thickness of the diaphragm in the above two patents increases the resistance of the composite diaphragm, while the dense inorganic oxide non-ion conductor It will reduce the volume ratio of the pores in the porous surface of the separator, reduce the ion diffusion coefficient and ion conductivity, reduce the actual capacity of the battery, and impair the high-speed charge / discharge performance

Method used

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  • Composite separator membrane, preparation method thereof, and application thereof in lithium ion batteries
  • Composite separator membrane, preparation method thereof, and application thereof in lithium ion batteries
  • Composite separator membrane, preparation method thereof, and application thereof in lithium ion batteries

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preparation example Construction

[0064] The application also provides a preparation method of a composite diaphragm, comprising the following steps:

[0065] Mix the binder, organic solvent and garnet-type conductor material, and obtain a suspension after dispersion;

[0066] The suspension is coated on the surface of the diaphragm and dried to obtain a composite diaphragm.

[0067] The garnet type conductor material described in the present application is preferably a lithium ion conductor as shown in formula (I):

[0068] Li x A 3 B 2 C δ o 12±λ (I);

[0069] 3≤x≤8, 0≤λ≤1, 0≤δ≤1;

[0070] A is selected from Na, K, Mg, Ca, Sr, Ba, Sc, Y, Al, Cr, Fe, Mo, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm One or more of , Yb and Lu; when A is selected from more than one element, the sum of the atoms of each element is 3;

[0071] B is selected from one or more of Zr, Hf, Nb, Ta, W, In, Sb, Bi, Te, Y, Al, Cr, Fe, Mo, La, Sc, Ba, Sr, Ca, Sn and Mg species; when B is selected from more than one element, th...

Embodiment 1

[0087] With an average particle size of 0.3 micron Li 3 Y 3 Te 2 o 12 It is a ceramic layer, and the mass ratio of binder, organic solvent and conductor material is 1:20:10. After the three are mixed and dispersed by planetary ball mill for 2 hours, the AFA-II automatic coating machine of Shanghai Pushen Chemical Machinery Co., Ltd. PP-PE-PP three-layer composite separator (celgard 2300) was coated on one side, dried in an oven at 60°C for 4 hours, then transferred to a vacuum oven at 60°C for 10 hours to obtain a ceramic composite separator. The thickness of the diaphragm before coating was 25 microns, and the thickness of the diaphragm after coating and drying was 27 microns, and the coating thickness was calculated to be 2 microns. Li 3 Y 3 Te 2 o 12 -PP-PE-PP composite membrane section scanning electron microscope photos image 3 As shown, the comparison of coating thickness, liquid absorption and conductivity data is shown in Table 1, organic battery separator and...

Embodiment 2

[0090] With an average particle size of 0.3 micron Li 5 La 3 Ta 2 o 12 It is a ceramic layer, and the mass ratio of binder, organic solvent and conductor material is 1:20:10. After the three are mixed and dispersed by planetary ball mill for 2 hours, the AFA-II automatic coating machine of Shanghai Pushen Chemical Machinery Co., Ltd. PP-PE-PP three-layer composite separator (celgard 2300) was coated on one side, dried in an oven at 60°C for 4 hours, then transferred to a vacuum oven at 60°C for 10 hours. get Li 5 La 3 Ta 2 o 12 Ceramic composite diaphragm. The comparison of coating thickness, liquid absorption rate and electrical conductivity data is shown in Table 1, and the comparison of heat shrinkage data is shown in Figure 8 , the curve ○ in the figure is the thermal shrinkage curve of the organic separator treated at the undetermined temperature, and the curve ● is the thermal shrinkage curve of the composite separator prepared in this example under the undeterm...

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Abstract

The invention provides a composite separator membrane which includes a separator membrane and a conductor material coating which is composited on the surface of the separator membrane. The conductor material coating includes a garnet conductor material. The conductor material coating on the surface of the separator membrane contains the garnet conductor material, so that during charging and discharging of a lithium ion battery, the separator membrane can supply a path for transmitting lithium ions, so that damage on the charging and discharging performance of the lithium ion battery is avoided due to existence of the path in the garnet conductor material even the surface of the separator membrane is coated with the coating and the porosity of the surface of the separator membrane is reduced, and meanwhile, a long cycle life is achieved. The invention also provides a preparation method of the composite separator membrane and an application thereof in the lithium ion batteries.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a composite diaphragm, its preparation method and its application in lithium ion batteries. Background technique [0002] The application field of lithium-ion batteries is still lithium-ion batteries based on liquid electrolytes, and its main components include positive electrodes, negative electrodes, electrolytes, and separators. Among them, the diaphragm is the most critical inner layer component and core material of the lithium-ion battery. The key performances of the battery, such as capacity, safety, cycle ability and fast charge and discharge capacity, are directly related to the diaphragm. Further optimization of the diaphragm material can simultaneously solve the problem of lithium ion The two issues of battery specific energy and safety. The traditional method uses a liquid electrolyte combined with a pure polymer separator, but lithium-ion batteries cann...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M10/0525H01M50/426H01M50/434H01M50/437
CPCY02E60/10
Inventor 许晓雄朱骏黄祯杨菁
Owner ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
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