A temperature-sensitive composite electrode and its preparation method

A composite electrode, sensitive technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor surface dispersion of the active material core, loss of battery specific energy and rate performance, low conductivity of PTC materials, etc. Room temperature and rate performance, reliable PTC effect, and the effect of improving thermal stability

Active Publication Date: 2021-02-19
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The materials used in the PTC electrodes currently used are generally polymer compositions or inorganic composite oxide materials containing conductive particles. The electrical conductivity is not high, and the dispersion on the surface of the active material core is not good, so the specific energy and rate performance of the battery will be lost to a certain extent, thus limiting its further application.

Method used

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  • A temperature-sensitive composite electrode and its preparation method
  • A temperature-sensitive composite electrode and its preparation method
  • A temperature-sensitive composite electrode and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0044]Lithium-ion batteries 1-1 to 1-11 using temperature-sensitive composite electrodes are prepared according to the following methods (referred to as LCO-P1BPy batteries):

[0045]Preparation of temperature-sensitive materials:

[0046]Weigh 5g of conductive material Ketjen Black (KB) and add it to concentrated nitric acid (4mol / L) and magnetically stir for 3h, then disperse the oxidized KB in 100mL deionized water ultrasonically for 60min, and add 6.3g sodium p-toluenesulfonate sequentially , 2g 1-butylpyrrole (1BPy), put it in inert gas N2Stir under magnetic force for 30min; at the same time weigh 10.09g FeCl3·6H2Dissolve O in 50mL deionized water, add it dropwise to the reaction system obtained in the above steps, and react with magnetic stirring for 4h under nitrogen protection at -5°C; then add 400mL distilled water and stir to remove excess FeCl3, Separate with a separatory funnel, repeat washing until the upper layer is colorless; add anhydrous Na2SO4Drying process to remove wat...

Embodiment 2

[0080]A temperature-sensitive composite electrode and lithium ion battery. The preparation method is roughly the same as that of Example 1, except that 1-butylpyrrole is replaced with 3-butylpyrrole.

[0081]The lithium ion battery obtained in this example was tested with reference to the method described in Example 1 for PTC effect, thermal stability, normal temperature cycle performance, and overcharge performance. The results showed that the temperature-sensitive composite electrode obtained was applied to the preparation of lithium ion batteries, and the performance Outstanding thermal stability, normal temperature cycle performance and rate discharge performance.

[0082]The PTC composite electrode provided by the present invention has good thermal stability, normal temperature cycle performance and rate discharge performance after being applied to a lithium ion battery, and can greatly improve the safety performance of the lithium ion battery.

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Abstract

The invention discloses a temperature-sensitive combination electrode. The temperature-sensitive combination electrode comprises an electrode active material, a temperature sensitive material and an adhesive, wherein the temperature sensitive material has dual effects of an electrode conducting agent and a temperature sensitive characteristic. At a normal operating temperature, the prepared temperature-sensitive electrode has high electrical conductivity, and electrochemical performance of the temperature-sensitive electrode is basically consistent with that of a conventional electrode; at a high temperature exceeding 100 DEG C, resistance and electrical conductivity of the temperature-sensitive combination electrode suddenly rise by more than three order of magnitudes, so that electrochemical capacity is suddenly decreased, and the thermal shutdown characteristic occurs; therefore, thermal runaway is inhibited, and the safety of a battery under misuse conditions such as overcharge, overheating and mechanical short circuit is improved. In addition, the temperature-sensitive combination electrode disclosed by the invention has the characteristics of being simple in preparation process, completely compatible with the conventional pole piece and battery manufacturing process, and the like.

Description

Technical field[0001]The invention belongs to the field of biomass carbon material preparation, and specifically relates to a graphene composite nitrogen and oxygen co-doped biomass carbon material and a preparation method thereof.Background technique[0002]Lithium-ion batteries have the characteristics of high specific energy, high specific power and long life, and are recognized as the first choice for vehicles and energy storage batteries. However, the continuous emergence of power battery safety accidents in recent years has severely restricted the development and large-scale application of large-capacity lithium-ion power batteries.[0003]The fundamental cause of safety accidents in lithium-ion batteries is thermal runaway. When the battery is overcharged, overdischarged, internal and external short circuit, needle stick, squeeze, vibration, etc., it is easy to cause the internal temperature of the battery to rise sharply, causing the battery The internal potential exothermic sid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/60H01M4/62H01M10/0525
CPCH01M4/366H01M4/608H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 艾新平李惠吉维肖曹余良杨汉西
Owner WUHAN UNIV
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