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Tin-based alloy negative electrode material of lithium ion battery and preparation method for tin-based alloy negative electrode material

A lithium-ion battery and tin-based alloy technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor cycle performance and large irreversible capacity of tin-based alloy negative electrode materials, and achieve low cost and simple preparation method Effect

Active Publication Date: 2017-06-20
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the problems of poor cycle performance and large initial irreversible capacity of tin-based alloy negative electrode materials, the present invention provides a formula and preparation method of tin-based alloy negative electrode materials. The alloy material can effectively Improved cycling performance of the alloy anode

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Accurately weigh 6.124g of metal tin, 3.866g of metal copper, and 0.01g of metal beryllium with an electronic balance. After weighing, place it in a vibrating ball mill and fill it with argon as a protective gas. The mass ratio of the ball to material is 10:1. It is milled with stainless steel balls for 5 hours, so that the three metal powders can be fully mixed. The mixed metal powders were sealed in an argon-protected quartz tube. Then it was melted in a pit furnace at 1250°C for 30 minutes, and the alloy ingot was obtained after cooling with the furnace. The obtained alloy ingot was repackaged in a quartz tube, and then kept in a pit furnace at 900°C for 1 h, then the quartz tube was taken out, and the quartz tube was quickly quenched in cold water.

[0036] Powder the alloy ingot, mix metal powder below 300 mesh with acetylene black and polytetrafluoroethylene according to the mass ratio of 8:1:1, and then apply it on the copper foil, and put it in an oven at 80°C ...

Embodiment 2

[0038] Cut off 3 g of the alloy ingot obtained by quenching in Example 1 above, and heat-treat at 300° C. for 5 h under an argon-protected atmosphere.

[0039]Powder the heat-treated alloy ingot, mix metal powder below 300 mesh with acetylene black and polytetrafluoroethylene at a mass ratio of 8:1:1, then coat it on copper foil, and heat it in an oven at 80°C and dry it thoroughly. After drying, cut out a disc with a diameter of 10mm as the research electrode. Then the button cell was assembled, with metal lithium as the counter electrode and commercially available LB315 as the electrolyte, and the battery was assembled in a glove box filled with argon. The battery test charge and discharge current is 0.1C, the charge and discharge voltage range is 2.5V-0V (vs. Li), and the test temperature is 28°C. Under this test condition, the initial discharge capacity of the battery is 551mAh / g, and after 25 cycles, the reversible capacity is 340mAh / g.

Embodiment 3

[0041] Accurately weigh 6.228g of metallic tin, 3.735g of metallic copper, and 0.038g of metallic beryllium with an electronic balance. After weighing, it was placed in a vibrating ball mill, filled with argon as a protective gas, and the mass ratio of balls to materials was 10:1. Mill with stainless steel balls for 5 hours, so that the three metal powders can be fully mixed. The mixed metal powders were sealed in an argon-protected quartz tube. Then it was melted in a pit furnace at 1250°C for 30 minutes, and the alloy ingot was obtained after cooling with the furnace. The obtained alloy ingot was repackaged in a quartz tube, and then kept in a well-type furnace at 900°C for 1 h, then the quartz tube was taken out, and the quartz tube was quickly quenched in cold water.

[0042] Powder the alloy ingot, mix metal powder below 300 mesh with acetylene black and polytetrafluoroethylene according to the mass ratio of 8:1:1, and then apply it on the copper foil, and put it in an ...

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Abstract

The invention discloses a tin-based alloy negative electrode material of a lithium ion battery and a preparation method for the tin-based alloy negative electrode material. The tin-based alloy negative electrode material comprises metal tin, beryllium and copper, and has the chemical formula of (Be<x>Cu<y>)<6>Sn<5>, wherein in the formula, the metal beryllium and copper are calculated based on mass percentage; x / (x+y) is equal to 0.25-3.0%; and equivalently, beryllium accounts for 0.25-3.0% of the total mass of the beryllium and copper. The preparation method comprises the steps of performing complete ball milling and uniform mixing on the metal tin, beryllium and copper powder, or metal tin and beryllium-copper intermediate alloy powder under inert gas protection; and the uniformly mixed metal powder is subjected to smelting and quenching at a high temperature, and an alloy ingot obtained by quenching is subjected to aging strengthening heat treatment. Therefore, high strength and toughness are realized, and the high-conductivity beryllium-copper alloy is dispersed around the active element tin to play an effect of buffering volume change in the circulation. The tin-based alloy negative electrode material prepared by the invention is relatively high in capacity, the cycling performance is effectively improved, and the preparation method is simple and suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery negative electrode materials and preparation thereof, and in particular relates to a lithium-ion battery tin-based alloy negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used in portable electronic products, such as smartphones, laptops, cameras, etc., due to their high energy density, good cycle performance, safety performance, and environmental friendliness. At present, lithium-ion batteries on the market generally use carbon materials as negative electrodes, and the theoretical expression of the compound formed by lithium in carbon materials is LiC 6 , its theoretical specific capacity is only 372mAh / g, because of the low density of carbon, its volumetric specific capacity is also small. [0003] Under the double pressure of environmental pollution and energy crisis, new energy vehicles such as gasoline-electric hybr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62H01M10/0525
CPCH01M4/387H01M4/628H01M10/0525Y02E60/10
Inventor 陈剑徐磊
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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