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Cathode 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, nanotechnology for materials and surface science, etc., can solve the problems of poor cycle performance of negative electrode active materials, improve cycle performance, prevent The effect of agglomeration, avoiding volume change

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 negative electrode active materials in lithium-ion batteries in the prior art

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Composite material preparation:

[0042] A. First add 900g of graphite and 100g of nano silicon powder (median particle size is 50nm) to 2000g of organic solvent mixed with acetone and tetrahydrofuran (ratio 1:1), then add 10g of modified polyvinylidene fluoride; Stir to a uniform and stable solid-liquid mixture, stir at 80°C for 3 hours, and after most of the solvent evaporates, dry it in vacuum at 120°C to obtain a graphite-nano-silicon composite material;

[0043] B. In a polytetrafluoroethylene-lined autoclave, add 2000g distilled water and 20g cobalt chloride hexahydrate, and stir to form a uniform solution; add 10g polyethylene glycol 6000 dispersant under strong stirring; then add graphite- For nano-silicon composite materials, add 15g of ammonium oxalate under continuous stirring; then, add an appropriate amount of distilled water to keep the filling degree of the reactor at 80% and seal it. , after washing and drying, put the obtained solid in a box furnac...

Embodiment 2

[0049] Composite materials, button batteries and full batteries were prepared in the same manner as in Example 1, except that nickel chloride hexahydrate was used to replace cobalt chloride hexahydrate, ammonium oxalate was replaced by ammonia, and the amount of nickel chloride hexahydrate was 25g. , the amount of ammonia water added is 10g, keep the filling degree of the reactor at 90%, heat up to 55°C under continuous stirring, and keep at a constant temperature for 24h to obtain a precursor suspension. After filtering, washing, and drying, the resulting solid is placed in a box Calcined in an argon atmosphere at 300°C for 6 hours in a type furnace to obtain a composite material S2 whose outermost layer is nickel oxide;

[0050] According to the same method as in Example 1, button battery A2 and full battery B2 were produced respectively.

Embodiment 3

[0052] Composite materials, button batteries and full batteries were prepared in the same manner as in Example 1, except that nano-zinc powder was used instead of nano-silicon powder as the middle layer material, and the calcination temperature was 320°C to obtain a composite material in which the middle layer was nano-zinc S3;

[0053] According to the same method as in Example 1, button battery A3 and full battery B3 were produced respectively.

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Abstract

The invention relates to a cathode active material of a lithium ion battery. The cathode active material comprises a core body, an interface layer cladding on an external surface of the core body and an outmost layer cladding on an external surface of the interface layer. The core body comprises carbon materials; the interface layer consists of a first material, which is one or more selected from elements capable of forming an alloy with lithium; the outmost layer consists of a second material, which is one or more selected from transition metal oxide, transition metal nitride and transition metal sulfide. The invention also relates to a preparation method of the cathode active material and a lithium ion battery prepared from the cathode active material. The cathode active material of the present invention contains the first material, which can increase capacity of the battery, and also contains the second material, which clads the first material and can effectively inhibit volume expansion of the first material caused by multiple charge and discharge. Therefore, cycle 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. 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, Pb, Ga, In...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/139H01M10/0525
CPCH01M4/5825Y02E60/122H01M4/48H01M10/0525H01M4/38B82Y30/00H01M4/583H01M4/362H01M4/366H01M4/58H01M4/5815H01M4/587Y02E60/10
Inventor 马永军涂佩郭姿珠
Owner BYD CO LTD
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