Preparation method of porous conductive LiFePO4 positive plate used in lithium ion battery

A lithium-ion battery, porous conductive technology, applied in battery electrodes, electrode manufacturing, circuits, etc., can solve the problems of expensive adhesives and solvents for dissolving adhesives, shortening the traditional process, and lengthy and cumbersome processes for positive electrodes , to achieve the effects of low manufacturing cost, simplified process, and high mass-to-capacity

Inactive Publication Date: 2010-10-06
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of porous conductive LiFePO that does not use binder to prepare lithium-ion battery 4 The method of the positive plate greatly shortens the traditional process and solves the problem of conventional preparation of LiFePO 4 The lengthy and cumbersome process of the positive electrode sheet requires a variety of process equipment and the problem of expensive binders and solvents for dissolving the binders

Method used

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  • Preparation method of porous conductive LiFePO4 positive plate used in lithium ion battery
  • Preparation method of porous conductive LiFePO4 positive plate used in lithium ion battery
  • Preparation method of porous conductive LiFePO4 positive plate used in lithium ion battery

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Embodiment 1

[0026] Put LiFePO under 20MPa pressure 4 The powder is cold-pressed into a green body, and the green body is placed in the constant temperature zone of the tube furnace, and then vacuumed for 1 hour (the vacuum degree reaches about 10Pa), after the air in the furnace is exhausted, nitrogen gas is introduced, and the temperature is raised to 700°C and then kept at constant temperature 15 min for sintering to make LiFePO 4 The particles are connected together, and then acetylene gas is introduced for chemical vapor deposition, and the LiFePO 4 A conductive carbon layer is coated on the particle, and the thickness of the conductive carbon film is about 4 nanometers. In the gas in the furnace, the volume percentage of acetylene gas is 10%, and the deposition time is 90 minutes. The sample after carbon deposition was cooled to room temperature with the furnace, and the porous conductive LiFePO was obtained. 4 Positive plate, conductive porous LiFePO 4 The porosity of the positi...

Embodiment 2

[0028] The difference is:

[0029] Put LiFePO under 30MPa pressure 4 The powder is cold-pressed into a green body, and the green body is placed in the constant temperature zone of the tube furnace, and then vacuumed for 1 hour (the vacuum degree reaches about 10Pa), after the air in the furnace is exhausted, nitrogen gas is introduced, and the temperature is raised to 580°C and then kept at a constant temperature 60 minutes for sintering to make LiFePO 4 The particles are connected together, and then acetylene gas is introduced for chemical vapor deposition, and the LiFePO 4 A conductive carbon layer is coated on the particle, and the thickness of the conductive carbon film is about 2 nanometers. In the gas in the furnace, the volume percentage of acetylene gas is 5%, and the deposition time is 3 hours. The sample after carbon deposition was cooled to room temperature with the furnace, and the porous conductive LiFePO was obtained. 4 Positive plate, porous conductive LiFeP...

Embodiment 3

[0031] The difference is:

[0032] Put LiFePO under 30MPa pressure 4 The powder is placed in the constant temperature zone of the tube furnace, then purged with argon for 2 hours, heated to 650°C and then sintered at a constant temperature for 30 minutes to make LiFePO 4 The particles are connected together, and then acetylene gas is introduced for chemical vapor deposition, and the LiFePO 4 A conductive carbon layer is coated on the particle, and the thickness of the conductive carbon film is about 3 nanometers. In the gas in the furnace, the volume percentage of acetylene gas is 20%, and the deposition time is 30 minutes. The sample after carbon deposition was cooled to room temperature with the furnace, and the porous conductive LiFePO was obtained. 4 Positive plate, porous conductive LiFePO 4 The porosity of the positive plate is about 28%. The first discharge efficiency was 94.8%, and the mass specific capacity of the positive plate was 159.3mAh / g.

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Abstract

The invention relates to the preparation technology of phosphate type positive plate used in lithium ion battery, in particular to a preparation method of adhesive free porous conductive LiFePO4 positive plate used in lithium ion battery. The method includes that LiFePO4 positive material powder subject to low temperature sintering and cold press moulding forms a porous structure, and then chemical vapor deposition method is adopted to uniformly coat a conductive carbon film on the LiFePO4 particle surface in porous structure, so as to obtain the porous conductive LiFePO4 positive plate. The invention can prepare the porous conductive LiFePO4 positive plate without using adhesive or solvent dissolving adhesive. The positive plate prepared by adopting the method has good conductivity and high discharge specific capacity. The invention has simple process and low positive plate manufacturing cost, greatly shortens the traditional process flow and solves the problems that the conventionalLiFePO4 positive plate preparation process is long and fussy, multiple process units as well as adhesive and solvent dissolving adhesive which are high in price are required.

Description

technical field [0001] The invention relates to the preparation technology of phosphate-type positive plates for lithium-ion batteries, in particular to a porous conductive LiFePO for lithium-ion batteries without binders. 4 Preparation method of positive plate. Background technique [0002] Lithium-ion battery is a new generation of green high-energy rechargeable battery. It has many advantages such as high voltage, high energy density, good charge / discharge cycle performance, small self-discharge, no memory effect, and wide operating temperature range. It is currently widely used in notebook computers. , mobile phones, video recorders, electronic instruments and other portable electronic products. Lithium-ion batteries are composed of positive electrodes, negative electrodes, electrolytes, and polymer porous diaphragms. The factors that determine the performance of lithium-ion batteries mainly include the performance of positive and negative electrode materials, especiall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/58H01M4/62
CPCY02E60/12Y02E60/10
Inventor 王晓辉周延春秦学
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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