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Method for coating waste lithium battery negative electrode materials with carbon

A technology for waste lithium batteries and anode materials, applied in battery recycling, recycling by waste collectors, regeneration of useful parts, etc., can solve problems such as low density, rising graphite material prices, small thermal expansion coefficient, etc., and achieve charge retention High, high specific capacity, stable graphite structure effect

Active Publication Date: 2019-08-06
浙江卡波恩新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] As an important source of energy for personal mobile devices, medical devices, and the automotive industry, commercial lithium batteries have grown rapidly in market size in the past two decades. Behind the huge market demand, there is a huge pressure on resource recovery, and carbon is currently commercialized. The most commonly used negative electrode material has the characteristics of good thermal conductivity and electrical conductivity, low density, small thermal expansion coefficient, corrosion resistance, small elasticity, non-toxic safety, simple preparation, low cost and high purity. According to the survey, there will be 52 million The kilograms of lithium battery anode materials have not been recycled, which will also lead to an increase in the price of graphite materials
[0003] In the prior art, lithium battery anode materials are recovered by using electrolysis method, ultrasonic stripping method, etc., but there is still room for further improvement in the effect of the recovered anode material, and the electrical conductivity of the material can be improved, thereby further improving the capacity and discharge performance of waste batteries

Method used

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  • Method for coating waste lithium battery negative electrode materials with carbon
  • Method for coating waste lithium battery negative electrode materials with carbon
  • Method for coating waste lithium battery negative electrode materials with carbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Put the waste lithium battery into the electric tank and soak it for 100 minutes to dry, then disassemble the packaged waste lithium battery by combining manual and machine methods, and disassemble the rolled lithium battery negative electrode material into strips of carbon-coated copper Foil, put the carbon-coated copper foil into a temperature-controlled water washing pool with a stirring device, pour clean water into the pool until all the copper foil is submerged, heat the water in the pool to 70°C, and wait until the carbon powder is completely removed from the copper foil Stop stirring after washing, take out the copper foil without carbon powder attached after wet separation from the washing tank, dry and pack to complete the recovery of metal copper, at this time, the remaining material in the temperature-controlled washing tank is carbon powder ;

[0021] The above carbon powder was reflux treated with 3 M nitric acid at 60°C for 8 hours, and washed with water ...

Embodiment 2

[0025] Put the waste lithium battery into the electric tank and soak it for 100 minutes to dry, then disassemble the packaged waste lithium battery by combining manual and machine methods, and disassemble the rolled lithium battery negative electrode material into strips of carbon-coated copper Foil, put the carbon-coated copper foil into a temperature-controlled washing pool with a stirring device, pour clean water into the pool until all the copper foil is submerged, heat the water in the pool to 70 °C, and wait until the carbon powder is completely removed from the copper foil. Stop stirring after washing, take out the copper foil without carbon powder attached after wet separation from the washing tank, dry and pack to complete the recovery of metal copper, at this time, the remaining material in the temperature-controlled washing tank is carbon powder ;

[0026] The above carbon powder was refluxed with 3 M nitric acid at 80°C for 10 h, and washed with water several times...

Embodiment 3

[0030]Put the waste lithium battery into the electric tank and soak it for 100 minutes to dry, then disassemble the packaged waste lithium battery by combining manual and machine methods, and disassemble the rolled lithium battery negative electrode material into strips of carbon-coated copper Foil, put the carbon-coated copper foil into a temperature-controlled water washing pool with a stirring device, pour clean water into the pool until all the copper foil is submerged, heat the water in the pool to 70°C, and wait until the carbon powder is completely removed from the copper foil Stop stirring after washing, take out the copper foil without carbon powder attached after wet separation from the washing tank, dry and pack to complete the recovery of metal copper, at this time, the remaining material in the temperature-controlled washing tank is carbon powder ;

[0031] The above-mentioned carbon powder was treated with 3 M nitric acid at 70°C for 10 h, washed with water sever...

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Abstract

The invention discloses a method for coating waste lithium battery negative electrode materials with carbon, which comprises the following steps: (1) dismantling and cleaning waste batteries, and carrying out acid treatment to obtain surface-carboxylated nanographite sheets; (2) reacting nano-silicon powder with 3-aminopropyl triethoxysilane to obtain surface-aminated nano-silicon powder; (3) ball-milling the mixture of the surface-carboxylated nanographite sheets and the surface-aminated nano-silicon powder to obtain a silicon-graphite sheet composite material; (4) obtaining a coated sample by taking hexuronic acid as a coating carbon source and adopting a liquid impregnation approach; (5) carbonizing the coated sample at 300-400 DEG C in a tubular furnace and carrying out heat preservation; and (6) ball-milling and sieving the product obtained in step (5) to obtain a carbon-coated silicon-based graphite sheet negative electrode material. The coated negative electrode material has high charge retention rate and good cycling performance. The decommissioned negative electrode material can be re-applied to lithium batteries.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a method for carbon-coating anode materials of waste lithium batteries. Background technique [0002] As an important source of energy for personal mobile devices, medical devices, and the automotive industry, commercial lithium batteries have grown rapidly in market size in the past two decades. Behind the huge market demand, there is a huge pressure on resource recovery, and carbon is currently commercialized. The most commonly used negative electrode material has the characteristics of good thermal conductivity and electrical conductivity, low density, small thermal expansion coefficient, corrosion resistance, small elasticity, non-toxic safety, simple preparation, low cost and high purity. According to the survey, there will be 52 million The kilograms of lithium battery anode materials have not been recycled, which will also lead to an increase in the price of graphite mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54H01M6/52
CPCH01M6/52H01M10/54Y02W30/84
Inventor 李建平朴良德
Owner 浙江卡波恩新材料有限公司
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