Silicon-based negative electrode material for lithium ion battery and preparation thereof, negative electrode sheet and secondary battery

A silicon-based negative electrode material, lithium-ion battery technology, applied in secondary batteries, battery electrodes, negative electrodes, etc., can solve the problems of uneven distribution of composite silicon, no research on negative electrode materials for lithium-ion batteries, and high carbonization temperature. , to achieve the effects of favorable cost control, commercialization and popularization, excellent cycle stability and rate performance, and simple reaction method.

Inactive Publication Date: 2020-02-14
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the compound obtained by this production process has disadvantages such as uneven distribution of silicon and easy agglomeration.
At the same time, the carbonization temperature is high, the process is difficult, and the production cost is high
[0009] So far, there has been no research on the composite system of silicon oxide, metal and carbon as a whole for lithium-ion battery anode materials

Method used

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  • Silicon-based negative electrode material for lithium ion battery and preparation thereof, negative electrode sheet and secondary battery
  • Silicon-based negative electrode material for lithium ion battery and preparation thereof, negative electrode sheet and secondary battery
  • Silicon-based negative electrode material for lithium ion battery and preparation thereof, negative electrode sheet and secondary battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1 g of glucose was dissolved in 20 mL of deionized water to form a solution, and then 0.4 g of tin acetate (C 4 h 6 o 4 Sn), followed by the addition of 0.6 g of diatomaceous earth (80–100 nm), glucose was used as a carbon precursor in this experiment. After that, the solution was put into a centrifuge and stirred for 10 h. After the centrifugal stirring, the solution was put into a freeze dryer to freeze for 2 h, and then dried for 8 h. The freeze-dried product was carbonized at a high temperature of 500 °C for 4 h, and after naturally falling to room temperature, the target product C-SiO was finally obtained. x -Sn. Mix the prepared tin-coated silicon oxide active material, conductive carbon black, and binder polyvinylidene fluoride uniformly in a mass ratio of 8:1:1, and use 1-methyl-2-pyrrolidone as a solvent to prepare negative electrode slurry material, which was coated on a copper foil to make a negative electrode sheet, and dried overnight at 50 °C. The ele...

Embodiment 2

[0040] 1 g of glucose was dissolved in 20 mL of deionized water to form a solution, and then 0.3 g of tin acetate (C 4 h 6 o 4 Sn), followed by the addition of 0.7 g of diatomaceous earth (80–100 nm), glucose was used as a carbon precursor in this experiment. After that, the solution was put into a centrifuge and stirred for 10 h. After the centrifugal stirring, the solution was put into a freeze dryer to freeze for 2 h, and then dried for 8 h. The freeze-dried product was carbonized at a high temperature of 500 °C for 4 h, and after naturally falling to room temperature, the target product C-SiO was finally obtained. x -Sn. Mix the prepared tin-coated silicon oxide active material, conductive carbon black, and binder polyvinylidene fluoride uniformly in a mass ratio of 8:1:1, and use 1-methyl-2-pyrrolidone as a solvent to prepare negative electrode slurry material, which was coated on a copper foil to make a negative electrode sheet, and dried overnight at 50 °C. The ele...

Embodiment 3

[0043] 1 g of glucose was dissolved in 20 mL of deionized water to form a solution, and then 0.2 g of tin acetate (C 4 h 6 o 4 Sn), followed by the addition of 0.8 g of diatomaceous earth (80–100 nm), glucose was used as a carbon precursor in this experiment. After that, the solution was put into a centrifuge and stirred for 10 h. After the centrifugal stirring, the solution was put into a freeze dryer to freeze for 2 h, and then dried for 8 h. The freeze-dried product was carbonized at a high temperature of 500 °C for 4 h, and after naturally falling to room temperature, the target product C-SiO was finally obtained. x -Sn. Mix the prepared tin-coated silicon oxide active material, conductive carbon black, and binder polyvinylidene fluoride uniformly in a mass ratio of 8:1:1, and use 1-methyl-2-pyrrolidone as a solvent to prepare negative electrode slurry material, which was coated on a copper foil to make a negative electrode sheet, and dried overnight at 50 °C. The ele...

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Abstract

The invention discloses a silicon-based negative electrode material for lithium ion battery, a preparation thereof, a negative electrode sheet and a secondary battery. The negative electrode materialis a metal / silicon oxide / carbon composite material C-SiOx-M with a three-dimensional porous structure prepared by a freeze-drying method. M is one or several of Fe, Mn, Co, Sn, Ti, Cu and Ni. X is isgreater than or equal to 0 and less than or equal to 2 in SiOx. The molar ratio of C: SiOx: M is (0.5-1): (1-5): 1. The negative electrode made of the negative electrode composite material shows excellent cycle stability and rate performance, and the electrical conductivity of the composite material is effectively improved.

Description

technical field [0001] The invention relates to the technical field of battery preparation, in particular to a silicon-based negative electrode material for a lithium ion battery and its preparation, a negative electrode sheet and a secondary battery. Background technique [0002] At present, the commercially produced lithium-ion battery anode materials on the market are mainly carbon-based anode materials, including graphite and mesocarbon microsphere anode materials. The theoretical capacity of this type of negative electrode material is about 372 mAh / g, but it has actually reached 370 mAh / g. There is almost no room for improvement in the capacity of graphite-based negative electrode materials. At the same time, the preparation process of carbon anode materials is also slightly complicated. Therefore, it is extremely necessary to develop a lithium-ion battery anode material with large theoretical capacity, commercialization, and mass production. [0003] In recent years,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M4/131H01M10/0525C01B32/05
CPCC01B32/05H01M4/131H01M4/366H01M4/483H01M4/62H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 丁旭丽梁道伟赵洪达
Owner JIANGSU UNIV OF SCI & TECH
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