High-silicon content carbon and silicon sandwiched material, preparation method thereof and application in lithium ion battery

A lithium-ion battery, carbon silicon technology, applied in the fields of electrochemistry and energy storage, which can solve problems such as large-scale production and commercialization barriers of manufacturing costs

Pending Publication Date: 2020-02-07
NANOSIENERGY INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the large-scale production and manufacturing cost of this structure are huge obstacles to its commercialization

Method used

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  • High-silicon content carbon and silicon sandwiched material, preparation method thereof and application in lithium ion battery
  • High-silicon content carbon and silicon sandwiched material, preparation method thereof and application in lithium ion battery
  • High-silicon content carbon and silicon sandwiched material, preparation method thereof and application in lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] CS40, a carbon-silicon sandwich negative electrode material with a silicon content of 40wt%, was prepared by the following method:

[0071] (1) Dissolve 0.8kg of PVB in 100L of isopropanol.

[0072] (2) Disperse 10.Kg of silicon nanoparticles (D50=110nm), about 110nm, in the above-mentioned isopropanol solution, and stir evenly for 1h.

[0073] (3) Then add 10kg of flake graphite (D50=3.0μm) and 2.5kg of asphalt into the slurry, and mix thoroughly with a nano-disperser SH156.

[0074] (4) Drying the mixture by rotary vacuum distillation to obtain a preliminary powder mixture.

[0075] (5) Roll the dried mixture with a roller granulator (Changzhou Pioneer Drying Equipment Co., Ltd.) at room temperature; the pressure is controlled at about 18 tons, and the rolling density is 1.4-1.5g / cm 3 . It is then crushed and sieved to obtain particles with a size of <1 mm. The fine powder is then crushed and crushed.

[0076] (6) Treat the particles obtained above at 500° C. und...

Embodiment 2

[0088] CS20, a carbon-silicon sandwich anode material with a silicon content of 20wt%:

[0089] (1) Dissolve 0.17 g of PVB in 50 mL of isopropanol.

[0090] (2) Disperse 2.0 g of silicon nanoparticles (D50=110 nm) in the above-mentioned isopropanol solution, and stir evenly for 1 h.

[0091] (3) Then add 6.0g flake graphite and 2.0g asphalt to the slurry, and mix them well.

[0092] (4) The mixture is dried by distillation under reduced pressure to obtain a preliminary powder mixture.

[0093] (5) Roll the dried mixture at room temperature. The pressure is 16ton / cm 2 , rolling density is 1.6g / cm 3 . It is then crushed and sieved to obtain particles with a size of <1 mm. The fine powder is then crushed and crushed.

[0094] (6) Treat the particles obtained above at 500° C. under an argon atmosphere for 0.5 h to obtain a first precursor.

[0095] (7) Crushing the first precursor and screening to obtain particles with a size of 2-40 μm; they are the second precursor.

[...

Embodiment 3

[0098] CS56, a carbon-silicon sandwich anode material with a silicon content of 56wt%:

[0099] (1) Dissolve 0.17 g of PVB in 50 mL of isopropanol.

[0100] (2) Disperse 5.6 g of silicon nanoparticles (D50=110 nm) in the above-mentioned isopropanol solution, and stir evenly for 1 h.

[0101] (3) Then add 2.4g flake graphite and 2.0g asphalt to the slurry and mix thoroughly.

[0102] (4) The mixture is dried by distillation under reduced pressure to obtain a preliminary powder mixture.

[0103] (5) Roll the dried mixture at room temperature. The pressure is 6ton / cm 2 , rolling density is 1.3g / cm 3 . It is then crushed and sieved to obtain particles with a size of <1 mm. The fine powder is then crushed and crushed.

[0104] (6) Treat the particles obtained above at 500° C. under an argon atmosphere for 0.5 h to obtain a first precursor.

[0105] (7) Crushing the first precursor and screening to obtain particles with a size of 2-40 μm. as the second precursor.

[0106] ...

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Abstract

The invention discloses a high-silicon content carbon and silicon sandwiched material, a preparation method thereof and application in a lithium ion battery. The carbon and silicon sandwiched materialmainly comprises nanometer silicon, sheet-shaped graphite and a conductive carbon material, wherein the sheet-shaped graphite is used for partitioning and encircling the nanometer silicon, and the conductive carbon material is used for pasting the nanometer silicon and the graphite. The high-silicon content carbon and silicon sandwiched material has relatively high specific capacity (750-2,400mAh / g), can be used with commercial graphite in a mixed way to manufacture a lithium ion battery negative and also can be independently used as a lithium ion battery negative electrode material. The preparation process of the high-silicon content carbon and silicon sandwiched material, provided by the invention, mainly comprises the steps of mixing, grinding, sintering, granulation, secondary sintering and the like, is simple and easy to control and is suitable for industrial production, and the current market demand can be satisfied.

Description

technical field [0001] The invention belongs to the field of electrochemistry and energy storage, and relates to a negative electrode material of a lithium ion battery, in particular to a carbon-silicon sandwich material with high silicon content and its preparation and application in a lithium ion battery. Background technique [0002] As an important means of energy storage, lithium-ion batteries have been widely used in various fields. In recent years, due to the urgent need for the development of electric vehicles, a large number of high-capacity and high-safety batteries are required. This has greatly promoted the development and commercialization of high-capacity lithium-ion batteries. However, the existing lithium-ion batteries mainly use traditional graphite as the negative electrode, and the capacity is close to its theoretical limit. Therefore, there is an urgent need to find new anode materials with higher capacity to further improve the energy of lithium-ion ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/386H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor Y·胡黄曦Q·杨
Owner NANOSIENERGY INC
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