Composite negative electrode material, preparation method thereof and lithium ion battery

A technology for lithium-ion batteries and negative electrode materials, which is applied in the direction of negative electrodes, electrode manufacturing, battery electrodes, etc., can solve the problems of negative electrode material cycle performance and rate performance that need to be improved, and achieve low preparation difficulty, short process and controllable cost Effect

Active Publication Date: 2020-05-15
BTR NEW MATERIAL GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the above solutions all have the problem that the cycle performance and rate performance of the negative electrode material need to be improved.

Method used

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  • Composite negative electrode material, preparation method thereof and lithium ion battery
  • Composite negative electrode material, preparation method thereof and lithium ion battery
  • Composite negative electrode material, preparation method thereof and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] This embodiment prepares the composite negative electrode material according to the following method:

[0055] Take 1.5kg of SiO powder, put it into a 5L experimental batch rotary CVD furnace, and pass nitrogen gas into the furnace to replace the atmosphere. After the oxygen content in the exhaust gas is lower than 200ppm, start to heat up while continuously feeding nitrogen gas. After the temperature was raised to 900°C, 0.8 L / min of methane was introduced with nitrogen as the carrier gas, and the reaction pressure was kept at 1.2 atm. After the reaction was continued for 6 hours, the methane gas was cut off, and the temperature was naturally lowered to obtain the composite negative electrode material.

[0056] After the negative electrode material is discharged, it is broken up and sieved, and the Raman spectrum test is carried out (the XPLORA laser confocal Raman spectrometer of Japan HORIBA is adopted, the laser wavelength is 532nm, and the test range is 100cm -1 to...

Embodiment 2

[0062] This embodiment prepares the composite negative electrode material according to the following method:

[0063] Take 150g of porous silicon powder (specifically >150cm 2 / g), join in the 5L experimental type batch-type rotary CVD furnace, feed nitrogen into the furnace to carry out atmosphere replacement, after the oxygen content in the exhaust gas is lower than 200ppm, start to heat up under the situation of continuously feeding nitrogen, be heated up to After 935° C., 1.0 L / min of methane was introduced with nitrogen as the carrier gas, and the reaction pressure was kept at 2.0 atm. After the reaction was continued for 10 hours, the methane gas was cut off, and the temperature was naturally lowered to obtain the composite negative electrode material.

[0064] After the negative electrode material was discharged, it was broken up and sieved for testing.

[0065] The negative electrode material prepared in this embodiment includes a porous silicon inner core and an inor...

Embodiment 3

[0070] Take 1.5kg of SiO powder, put it into a 5L experimental batch rotary CVD furnace, and pass nitrogen gas into the furnace to replace the atmosphere. After the oxygen content in the exhaust gas is lower than 200ppm, start to heat up while continuously feeding nitrogen gas. After heating up to 700°C, use nitrogen as the carrier gas to feed 1.8L / min of a mixture of acetylene and hydrogen (the molar ratio of acetylene to hydrogen is 2:1), keep the reaction pressure at 1.0atm, continue the reaction for 16h, and then cut off The mixed gas begins to cool down naturally to obtain the composite negative electrode material.

[0071] The negative electrode material prepared in this embodiment includes a SiO inner core and an inorganic carbon material coating layer coated on the SiO inner core, and the mass fraction of the coating layer is 4.3%. The Raman spectrum peak A of the negative electrode material prepared in this embodiment is at 503cm -1 , peak B is at 1351cm -1 , peak C...

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Abstract

The invention provides a composite negative electrode material, a preparation method thereof and a lithium ion battery. The composite negative electrode material comprises an inner core and a coatinglayer coating the inner core, the core is composed of a silicon-containing material, and the coating layer is a carbon material layer. The Raman spectrum of the composite negative electrode material has a peak A between 450 cm <-1 > and 550 cm <-1 >, a peak B between 1300 cm <-1 > and 1400 cm <-1 >, a peak C between 1530 cm <-1 > and 1630 cm <-1 > and a peak D between 2500 cm <-1 >. The preparation method comprises the following steps of introducing a protective atmosphere, introducing a reaction gas, and reacting with the silicon-containing material at a reaction temperature of 700-1450 DEGC to obtain the composite negative electrode material, wherein the reaction gas comprises a carbon-containing gas. The composite negative electrode material has the advantages of high cycle capacity retention ratio, good rate capability, small high-temperature aging loss and the like.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and relates to a negative electrode material, a preparation method thereof, and a lithium ion battery, in particular to a composite negative electrode material, a preparation method thereof, and a lithium ion battery. Background technique [0002] Lithium-ion battery is a secondary battery (rechargeable battery) that mainly relies on the movement of lithium ions between the positive and negative electrodes to work. During the charging and discharging process, Li + Intercalation and deintercalation back and forth between two electrodes: when charged, Li + It is deintercalated from the positive electrode, inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. [0003] The negative electrode of the lithium-ion battery is formed by mixing the negative electrode active material carbon mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62H01M10/0525
CPCH01M4/386H01M4/625H01M4/628H01M10/0525H01M2004/027C23C16/26C23C16/4417H01M4/366H01M4/483Y02E60/10H01M4/5825H01M4/0428H01M4/48H01M2004/021
Inventor 庞春雷孔一鸣梁腾宇任建国
Owner BTR NEW MATERIAL GRP CO LTD
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