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

A composite material, external conduction technology, applied in negative electrodes, battery electrodes, secondary batteries, etc., can solve the problem of poor electronic conductivity of lithium-containing silicon-oxygen materials, low first Coulomb efficiency and rate performance, poor cycle and rate performance, etc. problems, to achieve good cycle stability, improve slurry stability, and high rate performance.

Active Publication Date: 2021-07-16
BTR NEW MATERIAL GRP CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The specific capacity of silicon-oxygen negative electrode materials exceeds 2000mAh / g, but compared with graphite materials, silicon-oxygen negative electrode materials have lower first-time Coulombic efficiency, poor electrical conductivity, poor cycle and rate performance, etc., thus limiting its practical application
[0003] In order to improve the performance of silicon-oxygen materials, enterprises, universities and other related institutions have developed many methods, such as doping lithium elements in silicon-oxygen materials, through lithium doping can Significantly improve the first Coulombic efficiency of the silicon-oxygen material, but the lithium-doped silicon-oxygen material is highly alkaline, which may easily lead to unstable slurry, gas generation and sedimentation when preparing an aqueous slurry, which will affect the production of the battery, and The prepared lithium-containing silicon-oxygen material has poor electronic conductivity, low first-time Coulombic efficiency and low rate performance

Method used

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

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preparation example Construction

[0067] The present invention also provides a method for preparing the above-mentioned composite material, comprising: mixing first raw materials including the lithium silicon oxide compound, X source and Y source, and then sintering to obtain a fired product.

[0068] The above-mentioned X sources include at least one of oxides containing X and salt compounds containing X, such as aluminum oxide, aluminum chloride, zinc sulfate, zinc chloride, magnesium oxide, magnesium chloride, calcium oxide, calcium chloride, oxide At least one of copper, copper sulfate, beryllium oxide, beryllium chloride, tin oxide, tin sulfate, lanthanum oxide, lanthanum chloride, titanium oxide, and titanium chloride.

[0069] The Y source includes at least one of Y-containing oxides and Y-containing salt compounds, such as at least one of phosphorus pentoxide, ammonium phosphate, ammonium borate, boron oxide, lithium sulfate and sulfuric anhydride.

[0070] Preferably, the molar ratio of the silicon ox...

Embodiment 1

[0091] (1) Mix silicon oxide and lithium hydride at a molar ratio of 1.5:1, and then bake at 800°C for 4 hours under the protection of nitrogen to obtain a lithium silicon oxide compound.

[0092] (2) Mix the silicon oxide lithium compound obtained in step (1), titanium oxide and ammonium phosphate in a molar ratio of 1:0.01:0.01, and then sinter at 700°C for 4 hours to obtain the hydrophobic coating layer 2 coated silicon oxide lithium Burnt product of the compound.

[0093] (3) Place the burnt product obtained in step (2) in a tube furnace and heat it up to 600°C under the protection of nitrogen, and then pass it through acetylene, wherein the mass ratio of acetylene to the burnt product is 1:2, keep it warm for 10 hours and then cool it down. A carbon-coated outer conductive layer 3 is formed on the outer surface of the hydrophobic coating layer 2 to obtain a composite material.

Embodiment 2

[0095] (1) Mix silicon oxide and lithium hydride at a molar ratio of 0.5:1, and then roast at 600°C for 6 hours under the protection of nitrogen to obtain a lithium silicon oxide compound.

[0096] (2) Mix the silicon oxide lithium compound obtained in step (1), titanium oxide and ammonium phosphate in a molar ratio of 1:0.1:0.1, and then sinter at 300°C for 6 hours to obtain the hydrophobic coating layer 2 coated silicon oxide lithium Burnt product of the compound.

[0097] (3) Place the burnt product obtained in step (2) in a tube furnace and heat it up to 800°C under the protection of nitrogen, and then pass it through acetylene, wherein the mass ratio of acetylene to the burnt product is 1:2, keep it warm for 5 hours and then cool it. A carbon-coated outer conductive layer 3 is formed on the outer surface of the hydrophobic coating layer 2 to obtain a composite material.

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Abstract

The invention provides a composite material and a preparation method thereof, a negative electrode material, a negative electrode plate and a lithium ion battery. The composite material comprises an inner core comprising a silicon-oxygen-lithium compound, and a hydrophobic coating layer, wherein the core is partially or completely covered with the hydrophobic coating layer, the hydrophobic coating layer comprises a compound M with the chemical formula being LiaSiObXc and a compound N with the chemical formula being LidSiOeYf, a is larger than 0 and smaller than or equal to 5, b is larger than 0 and smaller than or equal to 5, c is larger than 0 and smaller than or equal to 5, d is larger than 0 and smaller than or equal to 5, e is larger than 0 and smaller than or equal to 5, f is larger than 0 and smaller than or equal to 5, X is a metal element, and Y is a non-metal element. The composite material provided by the invention has good electronic conductivity, high first coulombic efficiency, good cycle stability and high rate capability.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a composite material and a preparation method thereof, a negative electrode material, a negative electrode sheet and a lithium ion battery. Background technique [0002] With the continuous expansion and deepening of the application of lithium-ion batteries, there are more and more requirements for the performance of lithium-ion batteries, especially in terms of energy density of batteries, the traditional graphite anode materials are no longer enough to meet the growing market demand. As an anode material with high specific capacity, silicon-oxygen material has attracted much attention recently. The specific capacity of silicon-oxygen negative electrode materials exceeds 2000mAh / g, but compared with graphite materials, silicon-oxygen negative electrode materials have lower first-time Coulombic efficiency, poor electrical conductivity, poor cycle and rate performance, etc., thu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M4/131H01M10/0525C01B33/32
CPCH01M4/366H01M4/485H01M4/628H01M4/624H01M4/131H01M10/0525C01B33/32C01P2004/82C01P2006/40H01M2004/021H01M2004/027Y02E60/10H01M4/386H01M4/483
Inventor 邓志强谢维庞春雷任建国贺雪琴
Owner BTR NEW MATERIAL GRP CO LTD
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