Preparation method of tin-based cathode material of high-capacity lithium-ion battery

A technology for lithium-ion batteries and negative electrode materials, applied in electrode manufacturing, battery electrodes, secondary batteries, etc., can solve problems such as difficulty in large-scale production, volume expansion of metal tin, and poor long-term cycle performance, and meet the requirements of high-rate charging. Discharge, reduce contact resistance, improve the effect of electrochemical performance

Inactive Publication Date: 2016-07-27
田东
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the process of reversible lithium storage, the volume expansion of metal tin is significant, resulting in poor cycle performance and rapid capacity decay, so it is difficult to meet the requirements of large-scale production.
In the prior art, the cycle stability and the first charge and discharge of the tin-based negative electrode have been improved to a certain extent by reducing the particle size of the tin material, making tin into a porous material, reducing the dimension of the tin material, and preparing tin-carbon composite materials. Efficiency, however, most of these improvement measures require high cost, and the corresponding electrolyte needs to be matched to better perform its performance, and the long-term cycle performance of the material is still poor

Method used

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  • Preparation method of tin-based cathode material of high-capacity lithium-ion battery
  • Preparation method of tin-based cathode material of high-capacity lithium-ion battery

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Embodiment 1

[0023] A preparation method for a tin-based negative electrode material for a high-capacity lithium-ion battery, comprising the following steps:

[0024] (1) Add 5g nano-tin (50nm particle size) into ethanol solvent, ultrasonically disperse for 60min, then add 100g artificial graphite, mix and stir for 30min, then add 8g phenolic resin, continue mixing and stirring for 60min;

[0025] (2) Spray-dry the uniformly mixed slurry to obtain the precursor powder;

[0026] (3) The powder obtained in step (2) was heated to 800° C. for 8 hours under the protection of argon, cooled down to room temperature, and then ground to obtain a nano-tin / graphite composite material coated with organic pyrolytic carbon.

[0027] Coating the prepared composite material, PVDF, and conductive carbon black in a mass ratio of 85:10:5 on a copper foil as a negative electrode, a metal lithium sheet as a counter electrode, and 1mol / L lithium hexafluorophosphorus as an electrolyte , assembled into a button ...

Embodiment 2

[0029] A preparation method for a tin-based negative electrode material for a high-capacity lithium-ion battery, comprising the following steps:

[0030] (1) Add 10g of nano-tin (particle size: 50nm) into ethanol solvent, ultrasonically disperse for 60min, then add 100g of natural graphite, mix and stir for 45min, then add 10g of phenolic resin, continue to mix and stir for 60min;

[0031] (2) Spray-dry the uniformly mixed slurry to obtain the precursor powder;

[0032] (3) The powder obtained in step (2) was heated to 900°C for 10 hours under the protection of argon, cooled down to room temperature, and then ground to obtain a nano-tin / graphite composite material coated with organic pyrolytic carbon.

[0033] Coating the prepared composite material, PVDF, and conductive carbon black in a mass ratio of 85:10:5 on a copper foil as a negative electrode, a metal lithium sheet as a counter electrode, and 1mol / L lithium hexafluorophosphorus as an electrolyte , assembled into a but...

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PUM

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Abstract

The invention discloses a preparation method of tin-based cathode material of a high-capacity lithium-ion battery.The preparation method includes: mixing nano tin and graphite with a pyrolytic carbon organic matter precursor to obtain composite material precursor slurry, performing spraying drying to obtain precursor powder, calcining under inert atmosphere, and grinding to obtain nano tin/graphite composite material wrapped by organic matter pyrolytic carbon.By the preparation method, the dispersity of nano tin in the tin-carbon cathode material can be increased, the material stability during lithium getting off, high conductivity of the material is guaranteed, the pyrolytic carbon wrapping layer effectively wrap the surfaces of the particles of the material, the interface feature of the material can be improved effectively, and the electrochemical performance of the tin-carbon cathode material is increased.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery negative electrode materials, in particular to a preparation method of a high-capacity lithium-ion battery tin-based negative electrode material. Background technique [0002] Lithium-ion secondary batteries have now become the mainstream chemical power source and are widely used in most mobile terminal devices. Compared with nickel-metal hydride, nickel-cadmium and lead-acid batteries, lithium-ion secondary batteries have high operating voltage, high specific energy and Advantages such as long cycle life have been developed rapidly in recent years, and are more and more widely used in mobile devices such as notebook computers, digital cameras, mobile phones, MP3 and MP4. With the development of mobile devices in the direction of miniaturization and multi-function, higher requirements are placed on the energy density and service life of lithium-ion secondary batteries. Also due to the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M4/04H01M10/0525
CPCH01M4/0471H01M4/366H01M4/387H01M4/62H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 田东
Owner 田东
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