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A making method for tin, cobalt and carbon compound cathode materials of lithium ion battery

A technology of lithium-ion batteries and carbon composite materials, which is applied in the field of preparation of Sn-Co-C composite materials, can solve the problems of cycle stability to be improved, high-energy mechanical ball wear time, high process cost, etc., to improve cycle stability, The effect of low cost and simple preparation process

Inactive Publication Date: 2008-05-28
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Documents J. Hassoun, G. Mulas, S. Panero, B. Scrosati. Electrochem. Commun. 2007, 9: 2075-2081 and Documents J. Hassoun, S. Panero, G. Mulas, B. Scrosati. J. Power Sources .2007, 171: 928-931 reported the use of high-purity Sn, Co and C powders as raw materials to prepare Sn by high-energy mechanical ball milling 0.31 co 0.28 C 0.41 , the material has high specific capacity and good rate characteristics, but the cycle stability still needs to be improved, and the high-energy mechanical ball takes a long time to wear, resulting in large energy consumption and high process cost

Method used

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  • A making method for tin, cobalt and carbon compound cathode materials of lithium ion battery
  • A making method for tin, cobalt and carbon compound cathode materials of lithium ion battery
  • A making method for tin, cobalt and carbon compound cathode materials of lithium ion battery

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Experimental program
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Effect test

Embodiment 1

[0023] with SnO 2 (purity 99.9%), CoCO 3 (purity 99.9%) and graphite carbon as the initial raw material, the molar ratio is 3: 1: 17 for batching, after the mixture is ground evenly, it is placed in a flowing argon atmosphere and raised to 950 °C with a heating rate of 3 °C / min. ℃, cut off the protective gas after 2 hours of heat preservation, and then cool to room temperature with the furnace after another 2 hours of heat preservation. The XRD phase analysis results of the obtained sample show that the synthesized product is mainly CoSn 2 , Sn and C phases.

[0024]Mix the synthesized material, the conductive agent acetylene black and the binder PVDF at a mass percentage of 80:10:10 to make a slurry, evenly coat it on the copper foil, dry it to make a circular pole piece, and assemble it with metal lithium A simulated battery was used to conduct constant current charge and discharge experiments. The charge and discharge current density was 100mA / g, and the charge and disch...

Embodiment 2

[0026] with SnO 2 (purity 99.9%), Co 3 o 4 (purity 99.9%) and activated carbon (purity > 99%) are the initial raw materials, and the molar ratio is 6:1:19. The heating rate was increased to 1000°C, and after 2 hours of heat preservation, the protective gas was cut off, and then cooled to room temperature. The XRD phase analysis results of the obtained sample show that the synthesized product is mainly CoSn 2 and phase C.

[0027] Mix the synthesized material, the conductive agent acetylene black and the binder PVDF at a mass percentage of 80:10:10 to make a slurry, evenly coat it on the copper foil, dry it to make a circular pole piece, and assemble it with metal lithium A simulated battery was used to conduct constant current charge and discharge experiments. The charge and discharge current density was 100mA / g, and the charge and discharge voltage was controlled between 0.01 and 1.5V. The prepared Sn-Co-C composite anode material has a lithium intercalation capacity of ...

Embodiment 3

[0029] with SnO 2 (purity 99.9%), CoO (purity 99.9%) and activated carbon (purity > 99%) are the initial raw materials, and the ingredients are mixed in a molar ratio of 3:1:9. After the mixture is ground evenly, it is placed in a flowing argon atmosphere The temperature was raised to 900°C at a rate of 5°C / min, and the protective gas was cut off after 2 hours of heat preservation, and then cooled to room temperature. The XRD phase analysis results of the obtained sample show that the synthesized product is mainly CoSn 3 , Sn and C phases.

[0030] Mix the synthesized material, the conductive agent acetylene black and the binder PVDF at a mass percentage of 80:10:10 to make a slurry, evenly coat it on the copper foil, dry it to make a circular pole piece, and assemble it with metal lithium A simulated battery was used to conduct constant current charge and discharge experiments. The charge and discharge current density was 100mA / g, and the charge and discharge voltage was co...

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Abstract

The invention provides a preparation method of a tin-cobalt-carbon composite cathode material for a lithium ion battery. The method belongs to the field of the lithium ion battery, and adopts carbon thermal reduction. The invention is characterized in that the mixture ratio of a tin oxide and a cobalt compound is 1:1 to 4:1 according to the atomic ratio of Sn / Co, carbon powder is mixed into the mixture as the constituent of a reducer and a composite, and the atomic ratio of C / Co is 1:1 to 20:1. The mixture is arranged in flowing protective air after being ground evenly, the temperature of the protective air is raised to 800 DEG C to 1000 DEG C by the speed of 1 DEG C to 20 DEG C per minute for preserving heat for 0.5 to 6 hours. After preserving heat for 0.5 to 4 hours, the protective air is cut off, and a furnace is sealed for operating. After the heat preservation is over, the mixture is cooled to the room temperature followed the furnace. The invention has the advantages that the cost is low, the preparing technical processing is simple, the particles of Sn-Co-C composite powder is in micron size, carbon which has loose internal structure of particles and encircles alloy particles is all in favor of lowering irreversible capacity of an alloy cathode material for the first time, and enhancing yhr cyclic stability, so that the tin-based alloy cathode material for the lithium ion battery which has high scale prodcution ratio capacity and stable cyclic performance is possible.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and in particular relates to a preparation technology of a Sn-Co-C composite material used for a negative electrode of a lithium-ion battery. Background technique [0002] Lithium-ion batteries are more and more used in portable electronic products such as notebook computers, digital cameras, and mobile phones due to their advantages such as high specific capacity, long cycle life, no memory effect, small self-discharge, and wide operating temperature range. At present, commercial lithium-ion batteries are mostly based on LiCoO 2 It is the positive electrode and graphite is the negative electrode material, but due to the low theoretical specific capacity of graphite (372mAh / g), it is difficult to meet the high energy density requirements of laptop computers and electric vehicle batteries; and the lithium intercalation potential of carbon materials is too close to the metal lithium potential ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/04B01J19/00
CPCY02E60/12Y02E60/10
Inventor 赵海雷何见超贾喜娣
Owner UNIV OF SCI & TECH BEIJING
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