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Negative pole material for lithium-ion secondary battery, negative pole containing negative pole material, preparation method of negative pole and battery containing negative pole

A negative electrode material and secondary battery technology, applied in the field of negative electrode materials, can solve the problems of low reversible capacity, poor cycle performance, and high delithiation potential, and achieve reduced volume effect, high-strength bonding performance, and high lithium storage capacity. Effect

Inactive Publication Date: 2011-07-13
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The invention overcomes the defects of poor cycle performance, low reversible capacity, high delithiation potential and low coulombic efficiency of existing negative electrode materials, and provides a secondary lithium battery with high charge and discharge capacity, good cycle characteristics and safety. A positive negative electrode material, a negative electrode containing the negative electrode material and a preparation method thereof, and a battery containing the negative electrode

Method used

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  • Negative pole material for lithium-ion secondary battery, negative pole containing negative pole material, preparation method of negative pole and battery containing negative pole
  • Negative pole material for lithium-ion secondary battery, negative pole containing negative pole material, preparation method of negative pole and battery containing negative pole
  • Negative pole material for lithium-ion secondary battery, negative pole containing negative pole material, preparation method of negative pole and battery containing negative pole

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0117] Example 1 Preparation of Negative Active Material I Containing Silicon Using Spray Drying

[0118] (1) dry commercial Si (particle size is 500 nanometers), commercial carbon material (particle size is 1-15 micron, carbon material can be mesophase carbon microsphere MCMB, natural graphite, artificial graphite), carbon black as conductive additive (average particle diameter is 40 nanometers), phenolic resin, by weight 1: 2: 0.4: 1 ratio is added in the ethanol solution, mixes evenly to obtain the slurry with certain concentration (also can not add conductive additive);

[0119] (2) Dry the slurry obtained above with a spray dryer at 70°C to obtain a spherical precursor powder. The drying gas can be compressed air or an inert gas. The flow rate of the drying gas is 10L / min, and the pressure of the compressed air is 7bar. The flow rate of the material is 300ml / h;

[0120] (3) Pyrolyze the spherical precursor powder obtained in step (2) under high-purity nitrogen gas. The...

Embodiment 2

[0130] Example 2 Preparation of Negative Active Material II Containing Silicon Using Spray Drying Method

[0131] (1) dry commodity Si (average particle size at 500 nanometers), conductive carbon black (average particle size 30 nanometers), and phenolic resin are added in the ethanol solution in a ratio of 10:0.5:3, and uniformly mixed to obtain a slurry with a certain concentration material;

[0132] (2) Dry the slurry obtained above with a spray dryer at 80° C. with compressed air to obtain a spherical precursor powder. The flow rate of the drying gas is 8 L / min, the pressure of the compressed air is 6 bar, and the flow rate of the slurry is 250 ml / h;

[0133] (3) The spherical precursor powder obtained in step (2) is pyrolyzed under high-purity nitrogen. The pyrolysis method is as follows: first use 4 hours to raise the temperature from room temperature to 400°C, and then use 5 hours to raise the temperature from 400°C to 800°C. ℃, then keep the temperature at 800℃ for 1...

Embodiment 3

[0137] Example 3 uses the spray method to prepare the negative electrode active material III of C / Cu / Si

[0138] (1) Si (average particle diameter is 1 micron), copper acetate, phenolic resin is added in the ratio of 10: 2: 3 in ethanol solvent and mixes and prepares slurry (also can add a certain amount of conductive additive);

[0139] (2) Dry the above prepared slurry with a spray dryer at 80°C to obtain a spherical precursor powder, the flow rate of the drying gas is 15L / min, the compressed air pressure is 8bar, and the flow rate of the slurry is 400ml / h;

[0140] (3) Heat the spherical precursor powder obtained in step (2) under high-purity nitrogen gas. The method of heat treatment is: first use 2 hours to heat up from room temperature to 700 ° C, keep the temperature at 700 ° C for 1 hour, and then use 2 The hour is down to room temperature, obtains containing Si, Cu composite particle;

[0141] (4) Under the mixed gas containing ethylene and high-purity nitrogen (vo...

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Abstract

The invention relates to a negative pole material for a lithium-ion secondary battery, and the negative pole material comprises composite particles in core-shell structures, conductive additives and an amide type high-temperature-resistant binder, wherein each composite particle in the core-shell structure comprises an inner core and an outer shell layer, each inner core contains at least one of elemental silicon, a silicon oxide and a silicon alloy, and each outer shell layer is coated by one or more of inorganic materials, namely C, Cu, Ni, Fe, Cr, Al2O3, TiO2, LiPO3, Li2Si2O5, Li2SiO3, Li4SiO4, Li8SiO6 and SiO2; and the amide type high-temperature-resistant binder is one or more of polyamide, imide and amide-imide. The invention further relates to a negative pole containing the negative pole material and a preparation method thereof. The invention further relates to a battery containing the negative pole. The battery has the advantages of higher charge-discharge capacity, better cycle property and high safety, and is suitable for various mobile electronic devices or devices requiring mobile energy sources for driving.

Description

technical field [0001] The invention relates to a negative electrode material for a lithium ion secondary battery, a negative electrode containing the negative electrode material, a preparation method thereof, and a battery containing the negative electrode. Background technique [0002] With the rapid development of equipment portability and various electronic components, the demand for high-energy-density secondary batteries is increasing. Among them, lithium-ion secondary batteries have become the future development of chemical power sources due to their high specific energy, light weight, and high operating voltage. direction. At present, the negative electrodes of lithium-ion secondary batteries mainly use carbon materials, such as petroleum coke, carbon fiber, pyrolytic carbon, natural graphite, artificial graphite, etc., which were originally patented by SONY Corporation of Japan in March 1989 and commercialized in 1992 ( See Bruno, Journal of the Electrochemical Soc...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/139H01M10/052
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 钟开富李泓黄学杰陈立泉
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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