Carbon-coated antimony-zinc alloy material of cathode for lithium-ion battery and method for preparing same

A carbon-coated antimony-zinc, lithium-ion battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor cycle performance and low lithium storage capacity, achieve low cost, avoid agglomeration, and improve lithium storage capacity and cycle life effect

Inactive Publication Date: 2010-09-29
NINGBO POLYTECHNIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are multiple active / active and active / inactive systems in the alloy material. The lithium intercalation potential of each active component in the material is different, and the inactive component is evenly distributed around the active component, which can buffer the active component. This structural theory In fact, it can more effectively buffer the volume change of the material when intercalating and removing lithium and prevent the agglomeration of active components, thereby improving the lithium storage performance of the material. However, from the current reports, the prepared alloy materials generally have low lithium storage capacity and poor cycle performance. poor disadvantage

Method used

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  • Carbon-coated antimony-zinc alloy material of cathode for lithium-ion battery and method for preparing same
  • Carbon-coated antimony-zinc alloy material of cathode for lithium-ion battery and method for preparing same
  • Carbon-coated antimony-zinc alloy material of cathode for lithium-ion battery and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Accurately weigh 14.57g Sb with electronic balance 2 o 3 , 8.138g ZnO and 32g glucose were put into a planetary ball mill and fully milled with stainless steel balls for 40 hours. Heating in the furnace to 850° C. at a speed of 10° C. / min, keeping the temperature for 2 hours, and then slowly cooling to room temperature to obtain a carbon-coated antimony-zinc alloy negative electrode material for lithium ion batteries.

[0024] The obtained material was subjected to particle size analysis, and the average particle size was 110 nm. The content of carbon in the material was 3.5% by weight. The molar ratio of antimony and zinc in the material is 1:1.

[0025] Mix the synthesized material with acetylene black and polytetrafluoroethylene at a mass ratio of about 80:10:10, press it into a film with a thickness of about 1 mm, place it in an oven at 120°C and dry it fully, and intercept Surface area is 1cm 2 A circular membrane, pressed on a stainless steel mesh, made into ...

Embodiment 2

[0027] Accurately weigh 14.57g Sb with electronic balance 2 o 3 , 10.851g ZnO and 24g polyethylene glycol, put them into a planetary ball mill, fully ball mill them with stainless steel balls for 48 hours, put the ball-milled mixture in a crucible and put it into a program-controlled tube furnace, under the protection of high-purity argon Heating to 750°C at a speed of 5°C / min in a tube furnace, holding the temperature for 3 hours, and then slowly cooling to room temperature to obtain a carbon-coated antimony-zinc alloy negative electrode material for a lithium-ion battery.

[0028] The obtained material was subjected to particle size analysis, and the average particle size was 86 nm. The content of carbon in the material was 4.7% by weight. The molar ratio of antimony and zinc in the material is 3:4.

[0029] Mix the synthesized material with acetylene black and polytetrafluoroethylene at a mass ratio of about 80:10:10, press it into a film with a thickness of about 1 mm, ...

Embodiment 3

[0031] Accurately weigh 14.57g Sb with electronic balance 2 o 3 , 12.207g ZnO and 28g sucrose were put into a planetary ball mill and fully milled with stainless steel balls for 36 hours. Heating to 950°C at a speed of 10°C / min in the furnace, holding the temperature for 4 hours, and then slowly cooling to room temperature to obtain the carbon-coated antimony-zinc alloy negative electrode material for lithium-ion batteries

[0032] The obtained material was subjected to particle size analysis, and the average particle size was 138 nm. The content of carbon in the material was 2.6% by weight. The molar ratio of antimony and zinc in the material is 2:3.

[0033] Mix the synthesized material with acetylene black and polytetrafluoroethylene at a mass ratio of about 80:10:10, press it into a film with a thickness of about 1 mm, place it in an oven at 120°C and dry it fully, and intercept A circular membrane with a surface area of ​​1 cm2, pressed onto a stainless steel mesh, wa...

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Abstract

The invention relates to carbon-coated antimony-zinc alloy material of the cathode for a lithium-ion battery and a method for preparing the same. The method for preparing the carbon-coated antimony-zinc alloy material of the cathode for the lithium-ion battery comprising the following steps: mixing antimony oxide, zinc oxide and organic carbon source material, fully grinding the mixture into the ball shape, mixing the ground material evenly, putting the mixture into a tube furnace, heating the mixture to 650-1100 DEG C under the protection of the inert gas, preserving the temperature of the mixture for 1-6h, and gradually cooling down the mixture to the room temperature to obtain the carbon-coated antimony-zinc alloy material of the cathode for the lithium-ion battery. The molar ratio of the antimony to the zinc in the carbon-coated antimony-zinc alloy is 1:2 to 2:1, and the content of the carbon is 1-8 percent (by weight) of the antimony-zinc alloy. The carbon-coated antimony-zinc alloy cathode material for the lithium-ion battery has high lithium storage capacity, good recycling performance, simple preparation method and low cost, thereby being suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of lithium ion battery negative electrode materials and preparation thereof, in particular to a lithium ion battery carbon-coated antimony-zinc alloy negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long service life, low cost, and low pollution, making them widely used in emerging high-tech portable electronic products such as mobile phones, portable computers, cordless power tools, and video cameras. It has shown broad application prospects and potential huge economic benefits in defense industry, electric vehicles, space technology, etc. [0003] At present, the anode materials that have been practically used in lithium-ion batteries are basically carbon materials, such as artificial graphite, natural graphite, mesocarbon microspheres, petroleum coke, carbon fiber, pyrolytic resin carbon, etc. Generally, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/42H01M4/1395
CPCY02E60/122Y02E60/10
Inventor 袁正勇邱从平彭振博
Owner NINGBO POLYTECHNIC
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