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Negative electrode active material and secondary battery

A negative electrode active material and silicon-based material technology, applied in secondary batteries, active material electrodes, batteries, etc., can solve the problems of difficult formation of SEI film and poor cycle performance, achieve the first Coulombic efficiency and cycle performance improvement, and avoid constant broken effect

Pending Publication Date: 2021-02-02
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the main problem of tin-based materials and silicon-based materials is that there is a serious volume effect, and a huge volume expansion will occur during the charging process. Therefore, during the charging and discharging process, the negative active material is easily broken and pulverized, and it is difficult to form a stable surface. The SEI film, which leads to the battery's capacity fading too fast, poor cycle performance

Method used

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  • Negative electrode active material and secondary battery
  • Negative electrode active material and secondary battery
  • Negative electrode active material and secondary battery

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0060]This application also provides a method for preparing the negative electrode active material, which includes the following steps:

[0061]S10, crushing the bulk material containing one or more of the silicon-based material and the tin-based material to obtain a core structure with a certain particle size distribution.

[0062]S20: Disperse the polymer in the solvent and stir until the dispersion is uniform to obtain a solution.

[0063]S30: Add the core structure to the slurry 1, and stir until the mixture is uniform to obtain a mixed slurry.

[0064]S40: Transfer the mixed slurry to a spray dryer, and perform spray drying under an inert non-oxidizing gas atmosphere to obtain a solid powder.

[0065]S50: Heat the solid powder in an inert non-oxidizing gas atmosphere at a specific temperature and a specific time, and add or not add a catalyst as needed to obtain the negative electrode active material.

[0066]Among them, compared with the traditional wet coating, the negative active material pre...

Embodiment 1

[0107]Preparation of negative electrode active material

[0108]The block of silicon oxide (SiO) is crushed to obtain a core structure with a certain particle size distribution.

[0109]Disperse 1 g of polyacrylonitrile (PAN) in 1000 mL of dimethylformamide (DMF) solvent, and stir until the polyacrylonitrile is completely dissolved to obtain a solution.

[0110]Add 100 g of the core structure to the solution and stir until the mixture is uniform to obtain a mixed slurry.

[0111]The mixed slurry was transferred to a spray dryer, argon gas was introduced, and spray-dried at 190°C to obtain a solid powder.

[0112]The solid powder is heat-treated in an argon atmosphere, the temperature of the heat treatment is 450° C., and the time of the heat treatment is 4 hours, and the negative electrode active material is obtained after cooling.

[0113]Preparation of button cell

[0114]The mixed negative electrode material obtained by mixing the above-prepared negative active material and artificial graphite in a ...

Embodiment 2～17 and comparative example 1～4

[0117]The difference from Example 1 is that the relevant parameters in the preparation steps of the negative electrode active material are adjusted to obtain different negative electrode active materials. The preparation parameters different from those in Example 1 are shown in Table 1.

[0118]Test part

[0119]1. Use the test method described above to test the negative electrode active material.

[0120]2. The first Coulomb efficiency and cycle performance test

[0121]Discharge the button cell at a constant current at a rate of 0.1C to a voltage of 0.005V at a rate of 0.1C and a constant current at a rate of 0.05C to a voltage of 0.005V under a normal pressure environment at 25°C. Record the specific discharge capacity at this time. Secondary lithium insertion capacity; afterwards, it is charged at a constant current of 0.1C to a voltage of 1.5V, and the charging specific capacity at this time is recorded, which is the first lithium removal capacity. The button cell was subjected to 50 cycle...

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Abstract

The invention discloses a negative electrode active material and a secondary battery, the negative electrode active material comprises a core structure and a polymer modified coating layer coating atleast one part of the outer surface of the core structure, and the core structure comprises one or more of a silicon-based material and a tin-based material; the negative electrode active material hasan infrared absorption peak at a wave number of 1450 cm<-1> to 1690 cm<-1> in infrared spectroscopic analysis, and the transmittance T of the infrared absorption peak satisfies 80%<=T<=99%. By adopting the negative electrode active material provided by the invention, the secondary battery can take relatively high initial coulombic efficiency and cycle performance into consideration at the same time.

Description

Technical field[0001]This application belongs to the technical field of energy storage devices, and in particular relates to a negative electrode active material and a secondary battery.Background technique[0002]In recent years, due to the higher energy density requirements of the electric vehicle industry, a lot of research has been carried out on high-capacity anode active materials. Among them, tin-based materials and silicon-based materials have higher gram-capacity than carbon materials, so they are valued. Especially silicon-based materials have a very high theoretical gram capacity, which is several times that of graphite. However, the main problem of tin-based materials and silicon-based materials is that there is a serious volume effect, and huge volume expansion occurs during the charging process. Therefore, during the charging and discharging process, the negative electrode active material is easily broken and powdered, and it is difficult to form a stable surface. The SE...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525
CPCH01M4/362H01M4/485H01M4/625H01M10/0525Y02E60/10H01M4/366H01M4/386H01M4/387H01M4/587H01M4/622H01M4/134H01M4/1395H01M2004/027H01M2004/021H01M4/0404H01M4/043H01M4/483H01M2220/20H01M4/62
Inventor 梁成都赵玉珍官英杰温严黄起森
Owner CONTEMPORARY AMPEREX TECH CO
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