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

AI Technical Summary

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

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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Example Embodiment

[0064] This application also provides a method for preparing a composite diaphragm, including the following steps:

[0065] Mix the binder, the organic solvent and the garnet-type conductor material to 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 this 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, the sum of the atoms of...

Example Embodiment

[0086] Example 1

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

Example Embodiment

[0089] Example 2

[0090] With an average particle size of 0.3 micron Li 5 La 3 Ta 2 O 12 For the ceramic layer, the mass ratio of binder, organic solvent and conductor material is 1:20:10. After the three are mixed and dispersed by planetary ball milling for 2 hours, use the AFA-II automatic coating machine of Shanghai Pushen Chemical Machinery Co., Ltd. The PP-PE-PP three-layer composite membrane (celgard 2300) was coated on one side, dried in an oven at 60°C for 4 hours, and 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 and conductivity is shown in Table 1, and the comparison of heat shrinkage data is shown in Table 1. Figure 8 , The curve ○ in the figure is the heat shrinkage curve of the organic membrane treated at the undetermined temperature, and the curve ● is the heat shrinkage curve of the composite membrane prepared in this embodiment at the undetermined te...

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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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