Microporous polymer diaphragm for secondary lithium cell and its preparation method

A technology of microporous polymers and secondary lithium batteries, which is applied to battery components, circuits, electrical components, etc., can solve the problem of unsuitable secondary lithium battery manufacturing, no self-sealing mechanism, and mechanical strength of microporous inverted membranes. Poor problems, to achieve the effect of controllable aperture size, simple manufacturing process, and low cost

Inactive Publication Date: 2004-03-17
INST OF PHYSICS - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The microporous inverted membrane used for secondary lithium batteries is relatively poor in mechanical strength and does not have a self-sealing mechanism at high temperatures, so it is not suitable for direct use in the manufacture of secondary lithium batteries

Method used

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  • Microporous polymer diaphragm for secondary lithium cell and its preparation method
  • Microporous polymer diaphragm for secondary lithium cell and its preparation method
  • Microporous polymer diaphragm for secondary lithium cell and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Polyvinylidene fluoride (Kynar2851 type PVDF), 618 epoxy resin, N, N-dimethylbenzylamine, acetone, glycerol (glycerol) are mixed in a ratio of 10:8:1.2:160:7 by weight, Heat and dissolve to form a uniform and transparent solution as a casting solution, apply it on a clean glass substrate, leave it at room temperature for 5 minutes, then immerse it in a mixture of acetone and water with a volume ratio of 1:3 for 5 minutes at room temperature, take it out Then immerse in a mixture of acetone and water at a volume ratio of 1:3 at 0° C. for 25 minutes, and place in a vacuum oven at 40° C. for 36 hours to dry off residual solvents and non-solvents. SEM images of the diaphragm are shown in figure 1 , the electron micrograph of micropore closing after heating at 160℃ is shown in figure 2 .

[0045] Cut the dried membrane to 1.8cm 2 The disc, with metal lithium foil as the cathode and MCMB as the anode, is assembled with the separator into a button-type experimental battery...

Embodiment 2

[0048] Mix polyvinylidene fluoride (Kynar2851 type PVDF), 618 epoxy resin, dicyandiamide, acetone, glycerol (glycerol) in a weight ratio of 10:8:0.5:160:7, heat and dissolve to form a uniform and transparent The solution is used as a casting solution, coated on a clean glass substrate, left at room temperature for 5 minutes, then immersed in a mixture of acetone and water with a volume ratio of 1:3 at room temperature for 5 minutes, and then immersed in acetone at 0 °C after taking it out. and water in a mixed solution with a volume ratio of 1:3 for 25 minutes, and placed in an oven at 40° C. for 36 hours to dry off residual solvents and non-solvents.

[0049] The preparation of the anode and the assembly and testing methods of the battery are the same as in Example 1, and the charging and discharging data are listed in Table 1.

Embodiment 3

[0051] Mix polyvinylidene fluoride (Kynar2851 type PVDF), 618 epoxy resin, polyethylene polyamine, acetone, glycerin (glycerin) in a weight ratio of 10:8:1.5:160:7, heat and dissolve to form a uniform The solution is used as a casting solution, taken out and coated on a clean glass substrate, left at room temperature for 5 minutes, then immersed in a mixture of acetone and water with a volume ratio of 1:3 at room temperature for 5 minutes, taken out and then immersed in a 0°C The mixture of acetone and water with a volume ratio of 1:3 was placed for 25 minutes, and placed in an oven at 40° C. for 10 hours to dry off residual solvents and non-solvents.

[0052] The preparation of the anode and the assembly and testing methods of the battery are the same as in Example 1, and the charging and discharging data are listed in Table 1.

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Abstract

The present invention makes thermosetting resin, initiator, accelerant, cross-linking agent and thermoplastic polymer codissolve in mixed liquor of solvent and non-solvent to form homogeneous solution or suspended liquor, and adopts dry method, wet method or thermal method phase-reversal process and utilizes the control of temperature and time so as to obtain microporous polymer diaphragm. Said diaphragm is simple in preparatino process, low in cost, high in porosity, controllable in pore size, large in liquid-absorbing quantity, strong in surface adhesion property, high in mechanical strength, and favorable for making secondary lithium cell with good safety and long life, said cell is suitable for heavy current chargging and discharging, and said diaphragm also can be used as separation diaphragm and support diaphragm.

Description

technical field [0001] The invention belongs to the field of high-energy batteries, in particular to the technical field of high-energy batteries for manufacturing secondary lithium batteries at room temperature. technical background [0002] With the advancement of information, materials and energy technologies, secondary lithium battery technology and related materials have also developed rapidly. In the secondary lithium battery, the microporous polymer separator connects and separates the positive electrode and the negative electrode material. The separator is an insulator of electrons but allows ions to migrate through, and is an important part of the battery. The performance of the separator determines the interface structure of the battery and the internal resistance of the battery, which in turn affects the key characteristics of the battery such as capacity, cycleability, and charge-discharge current density. Therefore, a separator with excellent performance plays a...

Claims

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Application Information

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IPC IPC(8): H01M2/16
CPCY02E60/12Y02E60/10
Inventor 顾辉黄学杰陈立泉任旭梅吴锋单忠强
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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