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Nano-porous silica lithium battery anode material and preparation method and application thereof

A nano-porous, negative electrode material technology, applied in the direction of battery electrodes, negative electrodes, nanotechnology, etc., can solve the problems of poor conductivity, inability to form a conductive network, battery safety hazards, etc., achieve high charging and discharging speed, and is suitable for mass production , simple equipment and process

Inactive Publication Date: 2015-06-10
吕铁铮 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology describes two ways to make better quality solid state rechargeable batteries with high capacity by adding tiny holes or other structures on their surfaces instead of just making them up from pure silicone rubber. These small openings help prevent swelling when they expand again after repeated use over many cycles without losing its effectiveness. Additionally, this new type of structure helps increase charge/discharge speeds compared to traditional methods like carbon blacks that only enhance electrical conduction through contact between particles rather than filling these gaps.

Problems solved by technology

This patents discusses the use of silane (SiH2) in electronic applications due to their unique properties including excellent adhesiveness, strength, durability, flexibility, electrical insulation, low volatility, ability to create strong connections through sinterings, and good compatibility with existing electronics components during manufacturing processes. However, there exist technical challenges related to finding ways to recycle this expensive raw material without causing contamination issues associated with current commercial sources.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The preparation method of the nanoporous silicon-lithium battery negative electrode material of the present embodiment comprises the following steps:

[0043] (1) Filter and precipitate the waste slurry generated during the multi-wire cutting process in the silicon wafer production process, pickle and remove impurities (soak in dilute hydrochloric acid with a mass concentration of 8% for 5 hours), and dry to obtain silicon micropowder, which is It also contains a small amount of cutting tough silicon carbide, and the average particle size of about 1 μm is selected from the silicon micropowder for further ball milling; the ball milling uses high-strength ceramic balls, the ball-to-material ratio is 3:1, and the ball milling time is 4 hours;

[0044] (2) Place the micro-silicon powder treated by ball milling in step (1) in a strong acid for corrosion with a strong acid. The corrosion time is 60 minutes. The strong acid is composed of HF, HNO 3 and H 2 O composition; HF: ...

Embodiment 2

[0052] The difference between this example and Example 1 is that in step (1), the silicon micropowder is metal silicon micropowder with a purity of 99%, and the ones with an average particle size of about 2 μm are selected for further ball milling; high-strength ceramic balls are used for ball milling , the ball-to-material ratio is 3:1, and the ball milling time is 10 hours; step (2) strong acid HF:HNO 3 :H 2 The molar ratio of O = 4:1:10; 2% oxidant NaNO is added to the strong acid 2 , the corrosion time is 5 minutes; in step (3), it is detected that the average porosity of nanoporous silicon powder is 80%; in step (4), the mass ratio of nanoporous silicon to conductive agent and binder is 8:1:1 , using deionized water as a solvent, mixed to prepare a slurry; the conductive agent is scaly graphite powder, and the binder is sodium alginate; step (5) drying temperature is 90 ° C, drying time is 2h ; Step (6) coating thickness is 80 μm.

[0053] Compared with the traditional...

Embodiment 3

[0055] The difference between this embodiment and Embodiment 1 is that in step (1), the waste slurry is the waste silicon material produced during the diamond wire cutting process in the silicon wafer production process, and the silicon micropowder is selected with an average particle size of 6 μm for further processing. Ball milling, ball milling uses high-strength ceramic balls, the ball-to-material ratio is 3:1, and the ball milling time is 9 hours; step (2) strong acid HF:HNO 3 :H 2 The molar ratio of O=1:1:10; the corrosion time is 180 minutes; the average porosity of nanoporous silicon powder is 81% as detected in step (3); step (4) nanoporous silicon and conductive agent, bonding According to the mass ratio of 8:2:1, N-methylpyrrolidone (NMP) is used as solvent, mixed to prepare a slurry, and 4% carbon nanotubes are added to the conductive carbon black; step (5) drying temperature is 100°C, drying time is 1h; step (6) coating thickness is 60μm.

[0056] Compared with ...

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Abstract

The invention provides a nano-porous silica lithium battery anode material and a preparation method and an application thereof. The preparation method of the nano-porous silica lithium battery anode material comprises the steps that 1, silica powder waste generated in a silica wafer production process is filtered, settled, acid pickled, cleaned and dried, so that silica powder is obtained, or metallic silica powder with the purity being higher than 99% and the average grain diameter being 1 micro to 6 micros is directly selected; 2, dyeing and chemical corrosion are conducted on the silica powder, so that nano-porous silica powder is obtained; 3, fluorescence detection is conducted on the nano-porous silica powder; 4, the nano-porous silica powder, a conductive agent and an adhesion agent are mixed according to a certain ratio to be made into slurry, a metal collector is coated with the slurry, and then the nano-porous silica lithium battery anode material is obtained. The nano-porous silica lithium battery anode material is high in porosity and capable of resisting to volume expansion generated in the lithium insertion and removal process on a lithium battery, the silicone powder generated in the silicon wafer process is effectively recycled, and environmental pollution is reduced.

Description

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Claims

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Application Information

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Owner 吕铁铮
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