Unlock instant, AI-driven research and patent intelligence for your innovation.

Porous composite anode material for lithium ion battery and preparation method thereof

A composite material and porous structure technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of high production cost of silicon-based negative electrode materials, reduce the overall expansion of negative electrode materials, and difficulties in industrial production, and achieve improved cycle performance, Small volume expansion, reducing the effect of overall expansion

Active Publication Date: 2016-12-21
BTR NEW MATERIAL GRP CO LTD
View PDF14 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Aiming at the deficiencies in the prior art, the present invention uses the co-precipitation method or the spray drying method to obtain the transition metal oxide M x o y and silicon-based materials as raw materials to prepare M with a porous structure x o y / Si composites are used as anode materials for lithium-ion batteries, which not only reduces the overall expansion of the anode materials, but also due to the M x o y Both have high capacity with silicon-based materials. After the two play a synergistic effect, the specific capacity and cycle stability of the negative electrode material are greatly improved, and the problems of high production cost, complex process and difficulty in industrial production of silicon-based negative electrode materials are solved.

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
  • Porous composite anode material for lithium ion battery and preparation method thereof
  • Porous composite anode material for lithium ion battery and preparation method thereof
  • Porous composite anode material for lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] The preparation method of the composite material of the porous structure adopts the following two steps:

[0059] (1) Mn(NO 3 ) 2 Disperse silicon powder with a median particle size of 20.0nm in water through sodium tripolyphosphate, stir for 1 hour, and dry the obtained product, lotion, and dry to obtain a precursor by spray pyrolysis;

[0060] (2) The precursor is heated in a box furnace at a rate of 5°C / min, under a nitrogen atmosphere, and kept at 700°C for 4 hours to prepare a composite material with a porous structure; in the composite material, silicon powder accounts for mol of the composite material The percentage is 25%, and the mole percentage of manganese oxide in the composite material is 75%.

Embodiment 2

[0062] The preparation method of the composite material of the porous structure adopts the following two steps:

[0063] (1) Disperse cobalt acetate and silicon nanowires with a median particle size of 100.0 nm in deionized water through sodium dodecyl sulfate, stir for 3 hours, and spray dry to obtain a precursor;

[0064] (2) Put the precursor in a pusher kiln at a heating rate of 10°C / min under a nitrogen atmosphere at 800°C for 6 hours to prepare a composite material with a porous structure; in this composite material, silicon nanowires account for The molar percentage of the material is 10%, and the molar percentage of the cobalt oxide in the composite material is 90%.

Embodiment 3

[0066] The preparation method of the composite material of the porous structure adopts the following two steps:

[0067] (1) Ni(NO 3 ) 2 , Co(NO 3 ) 2 and MnSO 4 And silicon monoxide with a median particle size of 50.0nm is dispersed in an aqueous solution, ammonium bicarbonate is added, stirred for 2 hours, filtered, washed, and dried to obtain a precursor;

[0068] (2) In a rotary kiln, the obtained precursor is kept at 900°C under a krypton atmosphere for 2 hours at a heating rate of 15°C / min to prepare a composite material with a porous structure; in this composite material, monoxide The molar percentage of silicon in the composite material is 30%, and the molar percentage of nickel, cobalt and manganese oxide in the composite material is 70%.

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
Median particle sizeaaaaaaaaaa
Particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention relates to a porous composite anode material for a lithium ion battery and a preparation method thereof. The composite anode material is a composite material with a porous structure. According to the composite anode material, transition metal oxide MxOy which is of a porous structure is used as a skeleton, and pores are filled with nano-scaled silicon. The preparation method of the composite anode material comprises the steps of: dispersing transition metal salt and the nano-scaled silicon in a solvent, stirring and placing the mixture into a reactor; by coprecipitation or spray drying, obtaining a transition metal carbonate precursor; and calcining the transition metal carbonate precursor at a temperature of 400 to 1,000 DEG C to prepare the composite material with the porous structure. The porous composite anode material provides a reserved space for expansion of a silicon-based material, so that the volume of the integral material in the lithium insertion / extraction process is expanded a little, and thus, cycle performance of the porous composite anode material is improved; and moreover, the porous composite anode material is simple in synthetic process and suitable for industrial production.

Description

technical field [0001] The invention relates to the field of battery materials, in particular to a lithium-ion battery porous composite negative electrode composite material, its preparation method and application. Background technique [0002] Lithium-ion batteries have been widely used in portable electronic products and electric vehicles because of their advantages such as high working voltage, long cycle life, no memory effect, small self-discharge, and environmental friendliness. People put forward higher requirements on the current commercial lithium-ion batteries, hoping that they have higher energy density and higher power density. Lithium-ion positive and negative electrode materials are one of the core factors for increasing energy density. At present, the commercial negative electrode material is mainly graphite material, but its theoretical capacity is only 372mAh / g, which seriously restricts the improvement of the overall energy density of lithium-ion batteries...

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): H01M4/505H01M4/525H01M4/485H01M4/36H01M10/0525
CPCH01M4/364H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 王涛陈春天闫慧青
Owner BTR NEW MATERIAL GRP CO LTD