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Lithium ion battery silicon-tin composite negative electrode material and preparation method thereof

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor electrical conductivity, crushing, pulverization, and falling off of silicon

Inactive Publication Date: 2018-03-27
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the silicon material will expand in volume by about 400% in the process of intercalating and removing lithium, and the main material will be broken, pulverized, and fall off from the current collector. In addition, the conductivity of silicon is not good, and the conductivity is only 6.7×10 -4 S cm -1 , so it is not possible to simply use silicon materials as negative electrode materials for lithium-ion batteries

Method used

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  • Lithium ion battery silicon-tin composite negative electrode material and preparation method thereof
  • Lithium ion battery silicon-tin composite negative electrode material and preparation method thereof
  • Lithium ion battery silicon-tin composite negative electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Preparation of plating solution: SnCl 2 75g / L, NaOH100g / L, sodium citrate 233g / L;

[0028] Electroless plating time: 5min

[0029] Chemical plating temperature: 50℃

[0030] Stirring conditions: 300 revolutions per minute / min

[0031] Post-processing: After the electroless plating product is cleaned and filtered with deionized water, it is dried in a blast oven to obtain a silicon-tin composite material with a silicon content of 73.9% and a tin content of 26.1%; this material is Negative electrode material, assembled button cell, conductive agent is acetylene black, binder is PVDF; silicon-tin active material, the mass ratio of conductive agent and binder is 70:15:15; charge and discharge current density is 100mA / g.

[0032] figure 1 SEM image of the silicon-tin composite material in Example 1 (scanning electron microscope model: Hitachi S-4800)

[0033] figure 2 For the XRD pattern of silicon in Example 1, it can be determined that Si and Sn are present in the material (X-ray d...

Embodiment 2

[0036] Preparation of plating solution: SnCl 2 70g / L, NaOH120g / L, sodium citrate 200g / L;

[0037] Electroless plating time: 8min

[0038] Chemical plating temperature: 80℃

[0039] Stirring conditions: 200 revolutions per minute / min

[0040] Post-processing: After cleaning and filtering the chemically plated product with deionized water, it is dried in a blast oven to obtain a silicon-tin composite material with a silicon content of 55% and a tin content of 45%; this material is Negative electrode material, assembled button cell, conductive agent is acetylene black, binder is PVDF; silicon-tin active material, the mass ratio of conductive agent and binder is 70:15:15; charge and discharge current density is 100mA / g.

[0041] Figure 4 SEM image of the silicon-tin composite material in Example 2 (scanning electron microscope model: Hitachi S-4800)

[0042] Figure 5 For the XRD pattern of silicon in Example 2, it can be determined that Si and Sn are present in the material (X-ray diffrac...

Embodiment 3

[0045] Preparation of plating solution: SnCl 2 75g / L, NaOH 110g / L, sodium citrate 220g / L;

[0046] Electroless plating time: 2min

[0047] Chemical plating temperature: 75℃

[0048] Post-processing: After the electroless plating product is cleaned and filtered with deionized water, it is dried in a blast oven to obtain a silicon-tin composite material with a silicon content of 52.6% and a tin content of 47.4%; this material is Negative electrode material, assembled button cell, conductive agent is acetylene black, binder is PVDF; silicon-tin active material, the mass ratio of conductive agent and binder is 70:15:15; charge and discharge current density is 100mA / g.

[0049] Figure 7 SEM image of the silicon-tin composite material in Example 3 (scanning electron microscope model: Hitachi S-4800)

[0050] Picture 8 For the XRD pattern of silicon in Example 3, it can be determined that Si and Sn are present in the material (X-ray diffractometer model: Rigaku D / MAX-2500)

[0051] Picture...

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Abstract

The invention discloses a lithium ion battery silicon-tin composite negative electrode material and a preparation method thereof, wherein the lithium ion battery silicon-tin composite negative electrode material comprises a micro-scale silicon material and tin uniformly and chemically plated on the surface of the silicon material, the weight content of the element silicon is 20-75%, the weight content of the element tin is 25-80%, the micro-scale silicon material is placed in a chemical plating solution and is continuously stirred so as to uniformly disperse the micro-scale silicon material inthe chemical plating solution during the chemical plating, the chemical plating temperature is 50-80 DEGC, and the chemical plating time is 2-10 min. According to the present invention, the sensitization activation is not required during the chemical plating so as to reduce the cost and simplify the process; the silicon negative electrode material is modified through the chemical tin plating so as to improve the capacity and the electrochemical performance; and the prepared lithium ion battery silicon-tin composite negative electrode material has advantages of high specific capacity and stable cycle performance, and can remain above 500 mAh / g after 10 cycles.

Description

Technical field [0001] The invention relates to the technical field of lithium ion battery negative electrode materials, in particular to a silicon-tin alloy negative electrode material of lithium ion batteries and a preparation method. Background technique [0002] In recent years, lithium-ion batteries have developed rapidly. They have many advantages, such as high voltage, high energy density, good cycle performance, low self-discharge, and no memory effect. They have developed rapidly in the past 10 years and have excellent high performance and price advantages. It has been widely used in the field of mobile electronic terminal equipment such as mobile phones, notebook computers, mobile phones, armed equipment, and camcorders. At present, most of the commercial lithium-ion battery anode materials use carbon-based materials. Although this material has excellent electrochemical performance, its lithium storage capacity is low. Its actual specific capacity is now very close to ...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M10/0525
CPCH01M4/386H01M10/0525Y02E60/10
Inventor 单忠强王炤东田建华
Owner TIANJIN UNIV
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