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A tin nickel alloy negative material of lithium ion battery and its making method

A tin-nickel alloy negative electrode and lithium-ion battery technology, applied in electrode manufacturing, battery electrodes, electrolytic coatings, etc., can solve poor electrochemical stability, poor compatibility between metal powder and binder, and easy powdering and falling off of electrode active materials and other problems, to achieve the effect of easy operation, elimination of residual mechanical stress, and prevention of agglomeration

Inactive Publication Date: 2008-08-06
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, ultra-fine alloys and active / inactive composite alloy systems are used, mainly including Sn / Cu, Sn / Sb, etc. Most of the above systems are made of alloy powder by smelting alloy method, mechanical alloy method, etc., and then bonded by polytetrafluoroethylene However, the compatibility between the metal powder and the binder is very poor, and the coated electrode active material is often easy to powder and fall off, resulting in poor electrochemical stability.

Method used

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  • A tin nickel alloy negative material of lithium ion battery and its making method

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Experimental program
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Effect test

Embodiment 1

[0025] (1) 0.9mol K 4 P 2 o 7 ·3H 2 O and 0.1mol glycine were dissolved in a certain amount of deionized water, and then 0.10mol SnCl 2H 2 O, 0.35mol NiCl 2 ·6H 2 Add O to the above solution to dissolve, add water to make up to 1L, and finally add NH 4 OH to adjust the pH to 7.5.

[0026] (2) Add the electroplating solution prepared in the step (1) into the electroplating tank, connect the tin sheet and the nickel sheet together as the anode, and use the negative electrode current collector copper foil (thickness is 10 microns) as the cathode for the lithium ion battery , one side of the copper foil is coated with oil-based pen and ink, and one side is covered to achieve single-sided electroplating. At 45°C, the current density is 0.05A·dm -2 Under the condition of electroplating for 10 minutes;

[0027] (3) Wash off the ink on the electroplated copper foil in acetone, wash it three times with distilled water, dry it at room temperature, and dry it in vacuum at 100°C f...

Embodiment 2

[0031] (1) 0.9molK 4 P 2 o 7 ·3H 2 O and 0.1mol glycine were dissolved in a certain amount of deionized water, and then 0.15mol SnCl·2H 2 O, 0.30mol NiCl 2 ·6H 2 Add O to the above solution to dissolve, add water to make up to 1L, and finally add NH 4 OH to adjust the pH to 8.

[0032] (2) Add the electroplating solution prepared in the step (1) into the electroplating tank, connect the tin sheet and the nickel sheet together as the anode, and use the negative electrode current collector copper foil (10 microns in thickness) as the cathode for the lithium ion battery , one side of the copper foil is coated with oil-based pen and ink, and one side is covered to achieve single-sided electroplating. At 40°C, the current density is 0.1A·am -2 Under the condition of electroplating for 10 minutes;

[0033] (3) Wash the electroplated copper foil in acetone to remove the ink, then wash it twice with distilled water, dry it at room temperature, and dry it in vacuum at 100°C for...

Embodiment 3

[0037] (1) 0.9mol K 4 P 2 o 7 ·3H 2 O and 0.1mol glycine were dissolved in a certain amount of deionized water, and then 0.23mol SnCl·2H 2 O, 0.22mol NiCl 2 ·6H 2 Add O to the above solution to dissolve, add water to make up to 1L, and finally add NH 4 OH to adjust the pH to 8.5.

[0038] (2) Add the electroplating solution prepared in the step (1) into the electroplating tank, connect the tin sheet and the nickel sheet together as the anode, and use the negative electrode current collector copper foil (thickness is 10 microns) as the cathode for the lithium ion battery , one side of the copper foil is coated with oil-based pen and ink, and one side is covered to achieve single-sided electroplating. At 30°C, the current density is 0.15A·dm -2 Electroplating for 5 minutes under the condition;

[0039] (3) Wash the electroplated copper foil in acetone to remove the ink, then wash it twice with distilled water, dry it at room temperature, and dry it in vacuum at 100°C for...

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Abstract

The invention discloses a Li-ion battery tin-nickel alloy cathode material. The preparation method comprises the following steps of: firstly, preparing plating solution, adding the plating solution into a plating bath, plating by connecting a tin sheet with a nickel sheet together as the anode and clutch gold as the cathode, cutting the plated clutch gold into sheets after washing and drying to obtain the Li-ion battery tin-nickel alloy cathode material. The method is simple and easy to operate, provides conditions for industrialized production and is of notable practical value and economic benefit. The Li-ion battery tin-nickel alloy cathode material prepared and obtained has no active nickel of intercalation / deintercalation Lithium freed from the tin-nickel alloy cathode material during and charging and discharging and is dispersed evenly on the tine-nickel alloy formed after Lithium intercalation, avoiding agglomeration of big tin block during Lithium deintercalation.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to a tin-nickel alloy negative electrode material for lithium ion batteries and a preparation method thereof. Background technique [0002] Currently, lithium-ion secondary batteries have become an important energy source for portable devices. Carbon material is the anode material of commercialized lithium-ion batteries at present, and its theoretical capacity is 372mAh·g -1 , it has been difficult to meet the miniaturization development of various electronic equipment and the extensive demand of electric vehicles for large-capacity and high-power chemical power supplies. Therefore, research on new alloy anodes that can replace existing carbon anodes is becoming more and more active. [0003] Lithium can reversibly form alloys with most metals (Si, Sn, Sb, etc.). These metals can be used as negative electrode materials for lithium-ion batteries, among which tin alloy negative...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/04C25D3/02C25D11/00
CPCY02E60/10
Inventor 陈新丽李伟善谭春林
Owner SOUTH CHINA NORMAL UNIVERSITY
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