Lithium ion battery silicon oxygen anode material and preparation method thereof, and lithium ion battery

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of general rate performance of composite negative electrode materials, difficult to meet high rate charge and discharge, and inability to completely remove lithium ions, etc. Excellent cycle performance, low volume expansion effect, high rate performance effect

Inactive Publication Date: 2019-10-29
SHENZHEN BAK POWER BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, when the silicon oxide absorbs lithium ions during the first charging process of the battery, lithium oxide and lithium silicate are formed as by-products, and the by-products cannot completely remove the lithium ions absorbed during the charging process during the discharge process.
This irreversible reaction will cause the loss of a large amount of active lithium ions in the battery, forming an irreversible capacity
Therefore, the low initial Coulombic efficiency of conventional silicon oxide anodes limits the development of this class of materials.
[0006] In addition, the inventors found in the process of realizing the embodiment of the present application that the rate performance of the composite negative electrode material of silicon oxide and graphite is average, and it is difficult to meet the requirements of excessively high rate charge and discharge.

Method used

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  • Lithium ion battery silicon oxygen anode material and preparation method thereof, and lithium ion battery
  • Lithium ion battery silicon oxygen anode material and preparation method thereof, and lithium ion battery
  • Lithium ion battery silicon oxygen anode material and preparation method thereof, and lithium ion battery

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preparation example Construction

[0035] In a second aspect, the present invention provides a method for preparing a silicon-oxygen negative electrode material for a lithium-ion battery, comprising the following steps:

[0036] (1) Perform high-speed ball milling of graphite and elemental dopants under an inert atmosphere to obtain a mixture;

[0037] (2) Add silicon oxide to the above mixture and continue ball milling to obtain a mixture of silicon oxide and element-doped graphite;

[0038] (3) Mix the mixture of silicon oxide and element-doped graphite, organic carbon, and organic solvent, dry and granulate under an inert atmosphere to obtain a negative electrode material precursor;

[0039] (4) The anode material precursor obtained in step (3) is heated up to 500-1200° C. for calcination under an inert atmosphere, kept warm, and cooled to obtain the anode material for lithium ion batteries.

[0040] Wherein, the mass ratio of the graphite and the element dopant is (10-100):1, for example, it can be 10:1, 2...

Embodiment 1

[0055] A silicon-oxygen negative electrode material for a lithium ion battery, the preparation method of which comprises the steps of:

[0056] (1) 100 parts of graphite and 10 parts of carbon disulfide were subjected to high-speed ball milling under an inert atmosphere for 5 hours at a speed of 600 r / min to obtain a mixture;

[0057] (2) Add silicon oxide (SiOx, x=1) to the mixture obtained in step (1) and continue ball milling for 10 h at a rotation speed of 500r / min to obtain a mixture of silicon oxide and element-doped graphite;

[0058] (3) mixing the mixture of silicon oxide and element-doped graphite, pitch, and tetrahydrofuran, and spray-drying in an inert atmosphere to obtain a negative electrode material precursor;

[0059] (4) Heat the negative electrode material precursor obtained in step (3) to 800°C for 3 hours in an inert atmosphere, keep it warm for at least 0.5 hours, cool to room temperature, crush and sieve to obtain the silicon-oxygen negative electrode mat...

Embodiment 2

[0063] A silicon-oxygen negative electrode material for a lithium ion battery, the preparation method of which comprises the steps of:

[0064] (1) Perform high-speed ball milling on graphite for 5 hours under a hydrogen atmosphere, the internal pressure is 1bar-5bar, and the rotation speed is 600r / min to obtain a mixture;

[0065] (2) Add silicon oxide (SiOx, x=1) to the mixture obtained in step (1) and continue ball milling for 10 h at a rotation speed of 500r / min to obtain a mixture of silicon oxide and element-doped graphite;

[0066] (3) mixing the mixture of silicon oxide and element-doped graphite, pitch, and tetrahydrofuran, and spray-drying in an inert atmosphere to obtain a negative electrode material precursor;

[0067] (4) Heat up the negative electrode material precursor obtained in step (3) to 1200°C for 1 hour in an inert atmosphere, keep it warm for at least 0.5 hours, cool to room temperature, crush and sieve to obtain the silicon-oxygen negative electrode mat...

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Abstract

The invention discloses a lithium ion battery silicon oxygen anode material and a preparation method thereof, and a lithium ion battery. The lithium ion battery silicon oxygen anode material is a core-shell structure, the core-shell structure is composed of an inner core and a coating layer, the inner core is a mixture of silicon oxide and element doped graphite, and the coating layer is organic pyrolytic carbon, wherein, the element is at least one of H, S, P, Cu, Fe and Ni. The anode material is high in first coulombic efficiency and long in service life, and has the high rate performance.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a lithium-ion battery silicon-oxygen negative electrode material, a preparation method thereof, and a lithium-ion battery. Background technique [0002] Due to its outstanding advantages such as high energy density, excellent cycle life, high working voltage, low self-discharge rate, and environmental friendliness, lithium-ion batteries occupy a dominant position in the field of power supplies for portable electronic devices, and are also a leading force in the fields of electric vehicles and energy storage. ideal power supply. In 2015, the global lithium-ion battery industry reached 52.3 billion US dollars, presenting a huge market value, and China's market share also reached 49.2%. In the automotive industry, many countries currently regard electric vehicles as the future development direction of the automotive industry, and have received policy support from many...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525
CPCH01M4/366H01M4/483H01M4/62H01M4/628H01M10/0525Y02E60/10
Inventor 潘庆瑞李达张青勇李维夏进阳
Owner SHENZHEN BAK POWER BATTERY CO LTD
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