Composite film material for lithium battery and preparation method and application thereof

A composite film and lithium battery technology, which is applied in the direction of lithium batteries, battery pack components, non-aqueous electrolyte batteries, etc., can solve problems such as dead lithium, consumption of electrolyte, and rupture of solid electrolyte layer

Active Publication Date: 2018-01-16
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, metal lithium as a negative electrode also has the following problems: lithium deposition is uneven during charging, and a large amount of local lithium deposition will accelerate the volume expansion, which leads to the rupture of the solid electrolyte layer (SEI); Li dendrites are formed, and dendrites easily penetrate the separator. The short circuit caused by...

Method used

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  • Composite film material for lithium battery and preparation method and application thereof
  • Composite film material for lithium battery and preparation method and application thereof
  • Composite film material for lithium battery and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0107] Preparation of composite membrane materials:

[0108] (1) mixing one or more of the particles of the ion-electronic mixed conductor material, the particles of the electron conductor material, and the particles of the ion conductor material with a binder and a solvent to form a slurry;

[0109] The solvent is selected from N-methylpyrrolidone, acetonitrile, acetone, N,N-dimethylformamide, water and ethanol, and the mass fraction of the solvent in the slurry is 80%-98%, wherein, See Table 7 for the binders, solvents and their amounts used in conjunction with the ceramic conductor particles on the negative electrode side.

[0110] (2) coating the slurry prepared in step (1) on one side surface of the polymer film, drying to remove the solvent, thereby forming a conductor particle layer; and

[0111] (3) On the surface of the other side of the above-mentioned polymer film, the slurry of the coating on the positive side is coated, and the solvent is removed by drying. See ...

Embodiment 1

[0121] Embodiment 1 provides a rechargeable metal lithium battery and a solid metal lithium battery prepared therefrom. specifically,

[0122] (1) Assembling a rechargeable metal lithium battery, wherein the composite film material is used as a separator of the lithium battery, and the conductor particle layer faces the negative electrode; and

[0123] (2) Carry out charge and discharge formation on the assembled metal lithium battery.

[0124] The assembly of the simulated battery is carried out in a glove box containing argon. The material of the composite film is the base film 1 in Table 9. The positive electrode is a lithium cobaltate electrode, the counter electrode is metallic lithium, and the lithium salt is LiPF. 6 , the lithium salt concentration is 1mol / L, and the organic solvent is EC:DMC=1:1 (ie, solvent 9).

[0125] The constant current charge and discharge mode test was carried out using a charge and discharge instrument. The charge cut-off voltage was 4.2V, an...

Embodiment 2-31

[0131] Embodiments 2-31 of the present application provide a rechargeable metal lithium battery and a solid metal lithium battery prepared therefrom. specifically,

[0132] (1) Assembling a rechargeable metal lithium battery, wherein the composite film material is used as a separator of the lithium battery, and the conductor particle layer faces the negative electrode; and

[0133] (2) Carry out charge and discharge formation on the assembled metal lithium battery.

[0134] The assembly of the simulated battery was carried out in a glove box containing argon gas. The number of composite membrane materials corresponds to the base membrane 2-31 in Table 9, and the counter electrode is metal lithium. The lithium salts, solvents, additives, and positive electrode materials used are listed in Table 9. 10, wherein the lithium salt concentration is 1mol / L, and the additive concentration is 2wt%. At the same time, Table 10 also shows the operating temperature and charge and discharg...

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Abstract

The invention provides a composite film material for a lithium battery. The composite film material comprises a polymer film and a conductor particle layer coating the surface of the polymer film in one side. The conductor particle layer contains one or more of particles of an ion conductor material, particles of an ion-electron mixed conductor material and particles of an electron conductor material. The invention also provides a preparation method of the composite film material and an application of the composite film material in a rechargeable metal lithium battery. The invention provides aliquid metal lithium battery and solid metal lithium battery containing the composite film material.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry and new energy materials, and in particular relates to a composite membrane material used for lithium batteries and its preparation method and application. technical background [0002] In recent years, the rapidly developing electric vehicle and energy storage industries have put forward higher requirements on the energy density, cost, cycle and safety of lithium-ion batteries. [0003] The metal lithium anode is considered as the fourth generation anode, with a capacity up to 3860mAh / g and a low deposition potential (-3.04V). The use of metal lithium as the negative electrode can increase the energy density of the battery to 300wh / kg, which can effectively alleviate the mileage anxiety of electric vehicles. At the same time, it can also use lithium-free positive electrodes to reduce battery costs. [0004] The core problem of metallic lithium as the negative electrode lies in the infin...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M10/052H01M50/403H01M50/443H01M50/449
CPCY02E60/10
Inventor 黄杰凌仕刚李泉杨琪徐航宇李泓陈立泉
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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