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A tin carbon compound electrode material for lithium ion battery cathode and preparing method

A lithium-ion battery and composite electrode technology, applied in battery electrodes, electrode manufacturing, circuits, etc., can solve problems affecting material utilization, volume effect, fast capacity decay, etc., to facilitate large-rate charge and discharge, reduce volume effect, The effect of high reversible specific capacity

Active Publication Date: 2010-05-12
SHENZHEN BAK POWER BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, tin-based materials, like other metal-based materials, have a serious volume effect in the process of deintercalating lithium, resulting in poor cycle stability of the electrode, and the material is easily pulverized during the electrochemical cycle, resulting in serious safety hazard
SnO prepared by M.Y.MA et al. using the uniform precipitation method 2 - Graphite composite powder has a high first-time lithium intercalation capacity, but its first-cycle Coulombic efficiency is very low, and the capacity decays quickly. This method fails to solve the volume effect of tin-based materials in the process of lithium intercalation (The Chinese Journal of Nonferrous Metals, Vol.15No.5(2005):793-798)
Y. Liu et al. prepared advanced Sn / C composites by liquid-phase impregnation in organic solution-low temperature carbonization. The Sn / C composites prepared by this method have higher lithium intercalation capacity for the first time, and its first-cycle Coulombic efficiency is higher than that of the above. The maximum can reach 84%. Although the increase of tin content can increase the lithium storage capacity of the material, the capacity decay of the material is accelerated with the increase of tin content, which greatly affects the lithium storage capacity of the material. The utilization rate of materials causes waste of resources (Journal of Applied Electrochemistry, 32: 687-692, 2002)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Preparation of G-SnO 2 -C (G is graphite) composite anode material.

[0042] Weigh 32.4g of urea and dissolve it in water at 85°C to prepare a solution with a pH of 10 for future use. Weigh spherical natural graphite 100g, 23.6g SnCl 4 and 100g of stainless steel balls are placed in a stainless steel tank and sealed, placed on a planetary ball mill and milled at a speed of 200rpm for 60 minutes, then slowly added to the urea solution, stirring continuously during the addition, the stirring speed is 300rpm, and the reaction temperature is 85°C, the reaction time is 4 hours, after the reaction is completed, filter, wash, and dry to obtain G-Sn(OH) 4 composite material.

[0043] Weigh 10 g of medium-temperature coal tar pitch, dissolve it in tetrahydrofuran, and prepare 400 ml of a 5% coating layer solution for later use. The above G-Sn(OH) 4 The composite material was immersed in the coating solution and stirred at a speed of 300rpm for 1 hour to make the G-Sn(OH) 4...

Embodiment 2

[0047] Preparation of G-Sn-Ag-C composite anode material.

[0048] Weigh 32.4g of NaOH and dissolve it in water at 20°C to make a solution with a pH of 13 for later use; weigh 100g of spherical natural graphite, 70.8g of SnCl 4 , 91.8gAgNO 3 (Sn:Ag=1:2 molar ratio) and 100g stainless steel balls are placed in a stainless steel tank and then sealed, placed on a planetary ball mill and milled at a speed of 600rpm for 30 minutes, then slowly added to the NaOH solution, during the process of adding Stir continuously, the stirring speed is 300rpm, the reaction temperature is 20°C, and the reaction time is 4 hours. After the reaction is completed, filter, wash, and dry to obtain G-Sn(OH) 4 -AgOH composite material.

[0049] Weigh 30g of medium-temperature coal tar pitch, dissolve it in pyridine, and prepare 600ml of a 5% coating layer solution for later use. The above-mentioned composite material was immersed in the coating layer solution, and stirred at a speed of 300rpm for 4 h...

Embodiment 3

[0053] Preparation of G-Sn-Mg-C composite anode materials.

[0054] Take by weighing 45.4gKOH and dissolve it in water at 50°C, configure it as a solution with a pH of 13, and set aside; take by weighing spherical natural graphite 100g, 70.8gSnCl4, 51.3gMgCl2 (Sn:Mg=1:2 molar ratio) and 100g stainless steel balls and place Seal it behind the stainless steel tank, place it on a planetary ball mill and mill it at a speed of 50 rpm for 600 minutes, then slowly add it to the KOH solution, and keep stirring during the addition process, the stirring speed is 300 rpm, the reaction temperature is 50 ° C, and the reaction time is After 4 hours, filter, wash and dry after the reaction to obtain G-Sn(OH) 4 -Mg(OH) 2 composite material.

[0055] Weigh 10 g of medium-temperature coal tar pitch, dissolve it in acetone, and prepare 200 ml of a 5% coating layer solution for later use. The above-mentioned composite material was immersed in the coating layer solution, and stirred at a speed ...

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Abstract

The disclosed preparation method for Sn-C composite material for negative electrode of Li-ion cell comprises: (1) ball grinding the graphite and doped stannum salt material together; (2) adding product in (1) into alkali solution for reacting, filtering, and drying; (3) preparing the organic solution for cladding carbon layer, adding the product from last step, and drying for granulation; and (4)taking high-temperature solid phase reaction. The final product comprises the graphite body, cladding carbon layer and Sn-constained Li-storing material between the graphite surface and carbon layer,or in graphite layers, or in carbon layers. This invention can reduce the volume effect of Sn-constained active material, has well reversible specific capacity and cycle life.

Description

technical field [0001] The invention relates to an electrode material of a lithium ion battery and a preparation method thereof, in particular to a tin-carbon composite electrode material for a negative electrode of a lithium ion battery and a preparation method of the material. Background technique [0002] With the wide application and rapid development of various portable electronic devices and electric vehicles, people's demand and performance requirements for the power supply of various electrical products are also getting higher and higher. It has been successfully and widely used in the field of mobile electronic terminal equipment in the past ten years. [0003] At present, lithium transition metal oxide / graphite system is mostly used in commercial lithium-ion secondary batteries. Due to the low theoretical lithium storage capacity of the negative electrode itself in this battery system, it is difficult to meet people's increasing demand for battery capacity simply t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/04H01M4/38H01M4/62
CPCY02E60/10
Inventor 刘先龙
Owner SHENZHEN BAK POWER BATTERY CO LTD
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