Porous composite material partition and preparation method thereof, composite-structure cell and lithium ion battery

A technology of porous composite material and composite structure is applied in the field of preparation of composite structure cells, lithium ion batteries, and porous composite material separators, which can solve the problems of diaphragm damage, unfavorable promotion and use, short circuit, etc., and achieve guaranteed performance and performance. Effect

Active Publication Date: 2017-02-22
CHINA AVIATION LITHIUM BATTERY LUOYANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the preparation process, the slurry needs to be prepared first, and then the slurry is coated on the diaphragm and then dried to form a coating. This process is easy to cause damage to the diaphragm itself, affecting the performance and usability of the diaphragm, and may cause safety problems such as s

Method used

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  • Porous composite material partition and preparation method thereof, composite-structure cell and lithium ion battery
  • Porous composite material partition and preparation method thereof, composite-structure cell and lithium ion battery
  • Porous composite material partition and preparation method thereof, composite-structure cell and lithium ion battery

Examples

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Effect test

Embodiment 1

[0035] The porous composite separator of this embodiment includes a high temperature resistant resin substrate, a flame retardant and inorganic high temperature resistant particles, the high temperature resistant resin substrate is polyimide resin; the flame retardant is octabromoether, The consumption of flame retardant is 5% of the mass of high temperature resistant resin base material; The inorganic high temperature resistant particle is Al 2 o 3 , the amount of inorganic high-temperature-resistant particles is 10% of the mass of the high-temperature-resistant resin substrate. The porous composite separator has a porosity of 70%, a pore diameter D50<0.5 μm, and a thickness of 0.05 mm.

[0036] The preparation method of the porous composite separator of this embodiment comprises the following steps:

[0037] 1) Under the condition of 300 °C, the formula amount of flame retardant octabromoether and inorganic high temperature resistant particles Al 2 o 3 Add it to the high...

experiment example

[0050] In this experimental example, the lithium-ion batteries of Examples 1-5 were tested for safety performance, and the results are shown in Table 3.

[0051] The safety performance detection result of table 3 embodiment 1-5

[0052]

[0053] The porous composite separator of Examples 1-5 is a composite separator with high temperature resistance above 200°C, and has the properties of high temperature resistance, flame retardancy, corrosion resistance and impact; Battery, the lithium-ion battery of the present invention will not melt and burn when short-circuited, and can completely isolate the positive and negative electrodes, avoiding accidents of the lithium-ion battery under high temperature or impact conditions, and large-area short-circuit inside the battery. The problem that caused the battery to explode and catch fire.

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Abstract

The invention discloses a porous composite material partition and a preparation method thereof, a composite-structure cell and a lithium ion battery. The partition comprises a high-temperature-resistant resin substrate, a flame retardant and inorganic high-temperature-resistant particles, wherein the high-temperature-resistant resin substrate is composed of any one or more of a polyamide resin, a polyethylene terephthalate resin, a polyamide resin, a polystyrene resin and a polysilane resin; the flame retardant accounts for 1-15 wt% of the high-temperature-resistant resin substrate; the inorganic high-temperature-resistant particles are at least one of Al2O3, TiO2, ZrO2 and SiO2; and the inorganic high-temperature-resistant particles account for 5-15 wt% of the high-temperature-resistant resin substrate. The porous composite material partition can resist the high temperature of more than 200 DEG C, and has the advantages of flame retardancy, high temperature resistance, corrosion resistance and impact resistance. The porous composite material partition is independently formed, does not need to be applied to a pole piece or diaphragm, can not influence the pole piece or diaphragm in the forming process, and ensures the self performance and service performance of the pole piece and diaphragm.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a porous composite material separator, and also relates to a preparation method of the porous composite material separator, a battery cell with a composite structure and a lithium ion battery using the separator. Background technique [0002] At present, lithium-ion batteries are accepted by people because of their environmental protection, higher rated voltage, higher energy storage and longer service life, gradually replacing nickel-cadmium batteries that have occupied the market for nearly a hundred years. However, lithium-ion batteries have disadvantages, such as poor safety, and may cause an explosion when heated, especially nickel-cobalt lithium manganese oxide batteries, which have poorer safety performance. [0003] A conventional lithium-ion battery consists of a positive electrode, a negative electrode, and a PE / PP separator. The PE / PP separato...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/411H01M50/489
CPCH01M10/0525H01M50/403H01M50/409Y02E60/10
Inventor 李亚玲向德波李远欣高文超李明露仝俊利王志敏
Owner CHINA AVIATION LITHIUM BATTERY LUOYANG
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