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Anode active material of lithium ion battery, preparation method thereof and lithium ion battery

A negative electrode active material, lithium ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor cycle performance of negative electrode active materials, and achieve the effects of improving cycle performance, avoiding volume changes, and preventing agglomeration

Active Publication Date: 2012-05-30
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to solve the technical problem of poor cycle performance of the negative active material of the lithium-ion battery in the prior art

Method used

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  • Anode active material of lithium ion battery, preparation method thereof and lithium ion battery
  • Anode active material of lithium ion battery, preparation method thereof and lithium ion battery

Examples

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preparation example Construction

[0035] The present invention also provides a preparation method for the above-mentioned negative electrode active material. First, the outer surface of the first material is made of a composite body coated with the second material, and then the composite body is distributed on the surface of the carbon material. A method is prepared, for example, may specifically include the following steps.

[0036] Step 1. In a polytetrafluoroethylene-lined high-pressure reactor, add distilled water and transition metal salts in sequence, and stir to form a uniform solution; add the dispersant under strong stirring; then add the first material, and add the promoter under continuous stirring Then, add an appropriate amount of distilled water to keep the filling degree of the reactor at 60%-95%, seal it, heat it up to 110-200°C under continuous stirring, and keep it at a constant temperature for 12-24h to obtain a precursor suspension, which is filtered , washing, and drying, the obtained soli...

Embodiment 1

[0056] (1) Composite material preparation:

[0057] A. In a polytetrafluoroethylene-lined autoclave, add 2000g of distilled water and 20g of cobalt chloride hexahydrate, and stir to form a uniform solution; then add 10g of polyethylene glycol 6000 dispersant under strong stirring; then add 100g Nano-silica powder (median particle size is 50nm), add 15g of ammonium oxalate under continuous stirring; then, add appropriate amount of distilled water to keep the filling degree of the reactor at 80% and seal, heat up to 180°C under continuous stirring, and keep at constant temperature for 24h, to obtain The precursor suspension was filtered, washed and dried, and the resulting solid was placed in a box furnace at 400°C and calcined in an air atmosphere for 6 hours to obtain a nano-silicon-cobalt tetroxide composite material;

[0058] B. Add 900g graphite and 120g nano-silicon-cobalt tetroxide composite material to 2000g organic solvent mixed with acetone and tetrahydrofuran (ratio 1...

Embodiment 2

[0064] Composite materials, button batteries and full batteries were prepared in the same manner as in Example 1, except that copper chloride hexahydrate was used to replace cobalt chloride hexahydrate, ammonium oxalate was replaced by ammonia water, and the amount of copper chloride dihydrate added was 15 g , the amount of ammonia water added is 10g, keep the filling degree of the reactor at 90%, raise the temperature to 120°C under continuous stirring, and keep at constant temperature for 12h to obtain the precursor suspension. After filtering, washing and drying, the obtained solid is placed in the box Calcined in an argon atmosphere at 400°C for 6 hours in a type furnace to obtain a composite material S2 whose outermost layer is copper oxide;

[0065] According to the same method as in Example 1, button battery A2 and full battery B2 were produced respectively.

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Abstract

The invention relates to an anode active material of a lithium ion battery. The anode active material contains a core body and a plurality of composites adhered to the outside surface of the core body. The core body is made from a carbon material. The composites contain a first material and a second material for cladding the first material, wherein the first material contains one or more elements selected from elements which can react with lithium to form an alloy; and the second material contains one or more compounds selected from transition metal oxide, transition metal nitride and transition metal sulfide. The invention also relates to a preparation method of the above anode active material and a lithium ion battery with the use of the anode active material. The anode active material contains the first material and can raise battery capacity. In addition, the anode active material contains the second material for cladding the first material, so as to effectively inhibit volume expansion of the first material due to multi-time charge and discharge. Therefore, cycling performance of the battery is improved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, more specifically, to a negative electrode active material of a lithium ion battery, a preparation method thereof, and a lithium ion battery. Background technique [0002] Lithium-ion battery is a new green chemical power source. Compared with traditional nickel-cadmium batteries and nickel-metal hydride batteries, it has the advantages of high voltage, long life and high energy density. Therefore, since Japan's Sony Corporation launched the first generation of lithium-ion batteries in 1990, it has developed rapidly and is widely used in various portable devices. The traditional lithium-ion battery negative electrode uses graphite-like carbon materials, but its theoretical specific capacity is only 372mAh / g, which limits the further improvement of lithium-ion battery capacity. [0003] In the prior art, by adding some materials that can form an alloy with lithium, such as Si, Ge, Sn, Sb, Al,...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/1393H01M10/0525
CPCH01M4/5825Y02E60/122H01M4/583H01M4/48H01M10/0525H01M4/133H01M4/38H01M4/362Y02E60/10
Inventor 马永军涂佩郭姿珠
Owner BYD CO LTD
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