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
View PDF4 Cites 22 Cited by
  • 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 perf

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0035] The present invention also provides a method for preparing the above-mentioned negative electrode active material. Firstly, a composite body in which the outer surface of the first material is coated with the second material is made, and then the composite body is distributed on the surface of the carbon material. This method can be prepared by, for example, the following steps.

[0036] Step 1. In a high-pressure reactor lined with polytetrafluoroethylene, add distilled water and transition metal salt in sequence, and stir to form a uniform solution; add the dispersant under strong stirring; then add the first material, and add the accelerating agent under continuous stirring. Then, add an appropriate amount of distilled water to keep the filling degree of the reactor at 60%-95% and airtight. Under continuous stirring, the temperature is raised to 110-200℃ and kept at a constant temperature for 12-24h to obtain a precursor suspension. The precursor suspension is filtered ...

Example Embodiment

[0055] Example 1

[0056] (1) Preparation of composite materials:

[0057] A. Add 2000g of distilled water and 20g of cobalt chloride hexahydrate to a high pressure reactor lined with polytetrafluoroethylene, and stir to form a uniform solution; then add 10g of polyethylene glycol 6000 dispersant under vigorous stirring; then add 100g Nano silicon 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 airtight, continue to stir and heat up to 180℃, keep the temperature for 24h, get After the precursor suspension is filtered, washed, and dried, the solid obtained is 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 to 2000g organic solvent mixed with acetone and tetrahydrofuran ...

Example Embodiment

[0063] Example 2

[0064] The composite material, button cell and full battery were prepared by the same method as in Example 1, except that copper chloride hexahydrate was used to replace cobalt chloride hexahydrate, and ammonia water was used to replace ammonium oxalate. The amount of copper chloride dihydrate added was 15g , The amount of ammonia added is 10g, the filling degree of the reactor is kept at 90%, the temperature is raised to 120℃ under continuous stirring, and the temperature is kept for 12h to obtain the precursor suspension. After filtering, washing and drying, the solid obtained is placed in the box It is calcined in an argon atmosphere for 6 hours at 400℃ in a furnace to obtain the composite material S2 with the outermost layer of copper oxide;

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Average particle diameteraaaaaaaaaa
The average diameteraaaaaaaaaa
Lengthaaaaaaaaaa
Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap