Anode material for lithium-ion battery and preparation method of anode material

A technology of lithium-ion batteries and negative electrode materials, applied in battery electrodes, nanotechnology for materials and surface science, circuits, etc., can solve problems such as poor rate performance, poor structural stability, unsuitable preparation process, etc. Low cost, sufficient raw materials, good ion/electronic conduction effect

Inactive Publication Date: 2015-04-29
SOUTH CHINA UNIV OF TECH
2 Cites 45 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defects of poor electrode cycle performance and rate performance caused by the poor structural stability of existing silicon-based negative...
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Abstract

The invention discloses an anode material for a lithium-ion battery and a preparation method of the anode material. The material is structurally characterized by adopting a core-shell structure and comprises an active and stable core formed by uniformly dispersing submicron-grade multi-scale tungsten carbide particles in an amorphous silicon substrate and a highly-conductive shell coated with a thin-layer graphene sheet formed by stripping. The preparation method is a two-step ball-milling method, during ball milling in the first step, the tungsten carbide particles can fully play a milling assisting role to efficiently refine original coarse silicon; during ball milling in the second step, the graphene sheet formed by stripping ordinary graphite can stabilize the structure and improve the electrical conductivity. Therefore, the prepared anode material for the lithium-ion battery has the advantages of stable structure, good cycle performance, excellent rate performance and the like.

Application Domain

Material nanotechnologyCell electrodes

Technology Topic

Thin layerLithium electrode +9

Image

  • Anode material for lithium-ion battery and preparation method of anode material
  • Anode material for lithium-ion battery and preparation method of anode material
  • Anode material for lithium-ion battery and preparation method of anode material

Examples

  • Experimental program(9)

Example Embodiment

[0038] Example 1
[0039] The Si powder with a purity of 99.9%, a particle size of 325 mesh, a purity of 99.9% and a particle size of 1 to 2 microns is subjected to the first ball milling under the protection of argon; the mass of the Si powder accounts for the mixed powder 60% of the total mass of the body; the rotating speed of the ball mill is 1000 rpm, the ball milling time is 25 hours, and the mass ratio of the stainless steel grinding ball to the powder is 60:1 to obtain Si-WC composite powder.
[0040] The Si-WC composite powder obtained by ball milling is subjected to the second step of ball milling with graphite powder with a purity of 99.9% and a particle size of 30-40 microns under the protection of argon; the mass of the graphite powder accounts for the mixed powder 50% of the total mass of the body, the rotating speed of the ball mill is 1000 rpm, the milling time is 10 hours, and the mass ratio of the stainless steel grinding ball to the powder is 60:1 to obtain the Si-WCG composite material.
[0041] The prepared Si-WCG composite material is uniformly mixed with the conductive agent super-p and the binder CMC at a mass ratio of 8:1:1, then coated on copper foil, and dried in vacuum for 12h (100°C) to prepare electrode sheets . The simulated button battery is assembled in an argon atmosphere glove box, the counter electrode is a metal lithium sheet (purity is 99.9%), and the electrolyte is 1mol/L LiPF 6 Ethylene carbonate (EC)/dimethyl carbonate (DMC) (volume ratio 1:1) solution. The prepared button battery was subjected to charge-discharge test, and the test conditions were: charge-discharge current density was 0.2Ag -1 , The charge and discharge cut-off voltage is 0.01V~1.5V(vs.Li + /Li). Record the experimental results and list them in the attachment Image 6 (a) In.

Example Embodiment

[0042] Example 2
[0043] The Si powder with a purity of 99.9%, a particle size of 325 mesh, a purity of 99.9%, and a particle size of 1 to 2 microns is subjected to the first ball milling under the protection of argon; the mass of the Si powder accounts for the composite powder 50% of the total mass of the body; the rotating speed of the ball mill is 1000 rpm, the ball milling time is 25 hours, and the mass ratio of the stainless steel grinding ball to the powder is 60:1 to obtain Si-WC composite powder.
[0044] The Si-WC composite powder obtained by ball milling is subjected to the second step of ball milling with graphite powder with a purity of 99.9% and a particle size of 30-40 microns under argon protection; the mass of the graphite powder accounts for the composite powder 50% of the total mass of the body, the rotating speed of the ball mill is 1000 rpm, the milling time is 10 hours, and the mass ratio of the stainless steel grinding ball to the powder is 60:1 to obtain the Si-WCG composite material.
[0045] The prepared Si-WCG composite material is uniformly mixed with the conductive agent super-p and the binder CMC at a mass ratio of 8:1:1, then coated on copper foil, and dried in vacuum for 12h (100°C) to prepare electrode sheets . The simulated button battery is assembled in an argon atmosphere glove box, the counter electrode is a metal lithium sheet (purity is 99.9%), and the electrolyte is 1mol/L LiPF 6 Ethylene carbonate (EC)/dimethyl carbonate (DMC) (volume ratio 1:1) solution. The prepared button battery was subjected to charge-discharge test, and the test conditions were: charge-discharge current density was 0.2Ag -1 , The charge and discharge cut-off voltage is 0.01V~1.5V(vs.Li + /Li). Record the experimental results and list them in the attachment Image 6 (a) In.

Example Embodiment

[0046] Example 3
[0047] The Si powder with a purity of 99.9%, a particle size of 325 mesh, a purity of 99.9%, and a particle size of 1 to 2 microns is subjected to the first ball milling under the protection of argon; the mass of the Si powder accounts for the composite powder 40% of the total mass of the body; the rotating speed of the ball mill is 1000 rpm, the ball milling time is 25 hours, and the mass ratio of the stainless steel grinding ball to the powder is 50:1 to obtain Si-WC composite powder.
[0048] The Si-WC composite powder obtained by ball milling is subjected to the second step of ball milling with graphite powder with a purity of 99.9% and a particle size of 30-40 microns under argon protection; the mass of the graphite powder accounts for the composite powder 50% of the total mass of the body, the rotating speed of the ball mill is 1000 rpm, the ball milling time is 10 hours, and the mass ratio of the stainless steel grinding ball to the powder is 50:1 to obtain the Si-WCG composite material.
[0049] The prepared Si-WCG composite material is uniformly mixed with the conductive agent super-p and the binder CMC at a mass ratio of 8:1:1, then coated on copper foil, and dried in vacuum for 12h (100°C) to prepare electrode sheets . The simulated button battery is assembled in an argon atmosphere glove box, the counter electrode is a metal lithium sheet (purity is 99.9%), and the electrolyte is 1mol/L LiPF 6 Ethylene carbonate (EC)/dimethyl carbonate (DMC) (volume ratio 1:1) solution. The prepared button battery was subjected to charge-discharge test, and the test conditions were: charge-discharge current density was 0.2Ag -1 , The charge and discharge cut-off voltage is 0.01V~1.5V(vs.Li + /Li). Record the experimental results and list them in the attachment Image 6 (a) In.
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PUM

PropertyMeasurementUnit
Size10.0 ~ 200.0nm
Thickness5.0 ~ 12.0nm
Granularity325.0mesh
tensileMPa
Particle sizePa
strength10

Description & Claims & Application Information

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