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A Si-conductive ceramic composite negative electrode material for lithium batteries and its preparation method

A technology of conductive ceramics and negative electrode materials, applied in battery electrodes, nanotechnology for materials and surface science, secondary batteries, etc. Effects of Stability and Cyclic Stability

Active Publication Date: 2018-11-16
江苏贝肯新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is still difficult to effectively buffer the volume expansion of silicon, which hinders the use of silicon in the negative electrode utilization of lithium batteries.

Method used

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  • A Si-conductive ceramic composite negative electrode material for lithium batteries and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A kind of Si-conductive ceramic composite negative electrode material that is used for lithium battery, its preparation step is as follows:

[0029] Mix 9.6kg of coke with 6.4kg of silicon dioxide powder evenly, and heat it to 2800°C for reduction to obtain crude silicon; after fully grinding and refining the obtained crude silicon, pass in chlorine gas and heat to 485°C to react until silicon particles It is completely converted into silicon tetrachloride, and after slow cooling, hydrogen gas is introduced and then heated to 1100°C to reduce silicon tetrachloride to obtain a nanoparticle precursor of elemental silicon; the precursor is soaked in N-methylpyrrolidone to obtain an average particle size of less than 5nm passivated silicon nanoparticles; mixing the passivated silicon nanoparticles with the conductive ceramic slurry and stirring evenly, wherein the weight ratio of the passivated silicon nanoparticles to the solid phase components of the conductive ceramic slu...

Embodiment 2

[0032] A kind of Si-conductive ceramic composite negative electrode material that is used for lithium battery, its preparation step is as follows:

[0033] Mix 12kg of coke and 7.4kg of silicon dioxide powder evenly, and heat it in a sealed chamber to 2900°C for reduction to obtain crude silicon; fully grind and refine the obtained crude silicon, then pass in chlorine gas and heat to 495°C to react until the silicon particles are completely Converted into silicon tetrachloride, after slow cooling, pass in hydrogen and then heat up to 1150°C to reduce silicon tetrachloride to obtain nanoparticle precursor of elemental silicon; use tetrahydropyrrole to treat the precursor to obtain passivated silicon with an average particle size of less than 5nm Nanoparticles: Mix the obtained passivated silicon nanoparticles with 15kg of conductive ceramic slurry and stir evenly, wherein the conductive ceramic slurry contains 3.75kg of aluminum powder, 3.3kg of titanium powder and 3.85kg of tit...

Embodiment 3

[0036] A kind of Si-conductive ceramic composite negative electrode material that is used for lithium battery, its preparation step is as follows:

[0037] Mix 10kg of coke with 6.4kg of silicon dioxide powder evenly, and heat it to 2850°C for reduction to obtain crude silicon; after fully grinding and refining the obtained crude silicon, pass in chlorine gas and heat to 485°C to react until the silicon particles are completely Converted into silicon tetrachloride, after slow cooling, pass in hydrogen gas and then heat up to 1120°C to reduce silicon tetrachloride to obtain the nanoparticle precursor of elemental silicon; use N-methylpyrrolidone to treat the precursor to obtain passivation with an average particle size of less than 5nm Silicon nanoparticles; the obtained passivated silicon nanoparticles are mixed with 16.5kg conductive ceramic slurry and stirred evenly, wherein the conductive ceramic slurry contains 4.2kg aluminum powder, 4.14kg titanium powder and 3.6kg titaniu...

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Abstract

The invention provides a Si-conductive ceramic composite negative electrode material for a lithium battery and a preparation method thereof. The Si-conductive ceramic composite negative electrode material is characterized in that the volume change of a silicon negative electrode material during charging and discharging is inhibited by taking conductive ceramics as a skeleton. Silicon nano-particles are passivated and distributed with conductive ceramics so as to form secondary particles, so that the volume expansion of the silicon material is relieved without changing the sizes of the secondary particles. The conductive ceramics serve as the skeleton, and the silicon nano-particles have electrochemical activities, so that the negative electrode material has excellent specific capacity; andthe conductive ceramics have excellent mechanical properties, so that an internal stress produced by a volume effect of silicon can be absorbed. Furthermore, the mobility of the surface nanometer material is reduced by a carbon coating layer, the solid-electrolyte interface is improved, an active material is prevented from being corroded by electrolyte, and the electrode integration rate and conductivity during the volume change can be maintained. Therefore, the conductivity, electron mobility and cycling stability are improved.

Description

technical field [0001] The invention relates to the technical field of preparation of electrode materials, in particular to a Si-conductive ceramic composite negative electrode material for lithium batteries and a preparation method thereof. Background technique [0002] With the wide application and rapid development of various portable electronic devices and electric vehicles, the demand and performance requirements for their power systems, that is, chemical power sources, have increased dramatically. Lithium-ion batteries are characterized by their large specific energy, high operating voltage, and low self-discharge rate. Advantages are widely used in the field of mobile electronic terminal equipment, and with the increase in demand for high-energy power sources, lithium-ion batteries are developing towards higher energy density. At present, most commercial lithium-ion batteries use lithium cobalt oxide / graphite system. Due to the low theoretical capacity of the electrod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/485H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/386H01M4/485H01M4/624H01M4/625H01M10/0525Y02E60/10
Inventor 陈庆廖健淞
Owner 江苏贝肯新材料有限公司
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