Method for modifying lithium ion battery cathode

Abstract

This invention relates to lithium ion battery negative modifying method, which comprises the following steps: solving sodium sulfo benzoate, tosylic acid and pyrrole into water to process mixture; then mixing the lithium battery negative active materials, conductive carbon and adherent agent to process mixture and adding 1-cymene and 2-pyrrolidone to process plasm; finally coating plasm on the flow aluminum foil and after drying to process the lithium ion negative electrode to dip into mixture liquid and washing out of the impurity in ion water with flow density of 0.1-1.0mA / cm2 for 1-300 seconds polymerizing under temperature of 60-300deg C for heating for 1-48 hours.

Description

technical field

[0001] The invention relates to a manufacturing method of a lithium ion battery, in particular to a modification method of a cathode active material of a lithium ion battery. Background technique

[0002] Since the 1990s, lithium-ion batteries have become a new generation of secondary batteries due to their advantages such as high working voltage, high energy density, small self-discharge, and no memory effect. In recent years, with the rapid development of portable electronic devices such as notebook computers and mobile phones, the demand for lithium-ion batteries is increasing day by day; in addition, the vigorous development of electric vehicles, electric bicycles and other electric vehicles has made the manufacturing technology of lithium-ion batteries much researched. It has become the focus and focus of research in the 21st century.

[0003] At present, the main cathode active materials for lithium-ion batteries are LiCoO with layered structure. 2 , ...

Examples

Embodiment 1

[0015] Embodiment 1: at first sodium p-toluenesulfonate, p-toluenesulfonic acid and pyrrole are dissolved in water by making the p-methylbenzenesulfonate containing 0.5mol / L, 0.01mol / L p-methyl The mixed solution of benzenesulfonic acid and 0.05mol / L pyrrole; Then LiMn 2 o 4 , conductive carbon black and polyvinylidene fluoride are mixed in the mass ratio of 65:20:15 to make a mixture, and the mass concentration of the mixture obtained by adding 1-methyl 2-pyrrolidone solvent into the mixture is 50% slurry; Coat the slurry with a thickness of 100 μm on the aluminum foil and dry it to prepare the lithium-ion battery cathode. 2 Polymerization at low temperature for 60 seconds, cleaning the surface of the electrode with deionized water, and heat treatment at 60°C for 48 hours.

Embodiment 2

[0016] Embodiment 2: first sodium p-toluenesulfonate, p-toluenesulfonic acid and pyrrole are dissolved in water to make the p-toluenesulfonate containing 0.01mol / L, 0.3mol / L p-toluene Sulfonic acid and 0.4mol / L pyrrole mixture; then LiCoO 2 , conductive carbon black and polytetrafluoroethylene are mixed in the mass ratio of 90:5:5 to form a mixture, and the mass concentration of the mixture obtained by adding 1-methyl 2-pyrrolidone solvent into the mixture is 80% slurry; Coat the slurry with a thickness of 1000 μm on the aluminum foil and dry to prepare the lithium-ion battery cathode. 2 Polymerization at low temperature for 300 seconds, cleaning the surface of the electrode with deionized water, and heat treatment at 150°C for 18 hours.

Embodiment 3

[0017] Embodiment 3: at first sodium p-toluenesulfonate, p-toluenesulfonic acid and pyrrole are dissolved in water to make the p-toluenesulfonate containing 0.3mol / L, 0.5mol / L p-toluene Sulfonic acid and 0.1mol / L pyrrole mixture; then LiNiO 2 , conductive carbon black and polyvinylidene fluoride are mixed in the mass ratio of 80:7:13 to form a mixture, and the mass concentration of the mixture obtained by adding 1-methyl 2-pyrrolidone solvent to the mixture is 60% slurry; Coat the slurry with a thickness of 400 μm on the aluminum foil and dry to prepare the lithium-ion battery cathode. 2 Polymerization at low temperature for 150 seconds, cleaning the surface of the electrode with deionized water, and heat treatment at 300°C for 1 hour.

technical field

[0001] The invention relates to a manufacturing method of a lithium ion battery, in particular to a modification method of a cathode active material of a lithium ion battery. Background technique

[0002] Since the 1990s, lithium-ion batteries have become a new generation of secondary batteries due to their advantages such as high working voltage, high energy density, small self-discharge, and no memory effect. In recent years, with the rapid development of portable electronic devices such as notebook computers and mobile phones, the demand for lithium-ion batteries is increasing day by day; in addition, the vigorous development of electric vehicles, electric bicycles and other electric vehicles has made the manufacturing technology of lithium-ion batteries much researched. It has become the focus and focus of research in the 21st century.

[0003] At present, the main cathode active materials for lithium-ion batteries are LiCoO with layered structure. 2 , ...

Examples

Embodiment 1

[0015] Embodiment 1: at first sodium p-toluenesulfonate, p-toluenesulfonic acid and pyrrole are dissolved in water by making the p-methylbenzenesulfonate containing 0.5mol / L, 0.01mol / L p-methyl The mixed solution of benzenesulfonic acid and 0.05mol / L pyrrole; Then LiMn 2 o 4 , conductive carbon black and polyvinylidene fluoride are mixed in the mass ratio of 65:20:15 to make a mixture, and the mass concentration of the mixture obtained by adding 1-methyl 2-pyrrolidone solvent into the mixture is 50% slurry; Coat the slurry with a thickness of 100 μm on the aluminum foil and dry it to prepare the lithium-ion battery cathode. 2 Polymerization at low temperature for 60 seconds, cleaning the surface of the electrode with deionized water, and heat treatment at 60°C for 48 hours.

Embodiment 2

[0016] Embodiment 2: first sodium p-toluenesulfonate, p-toluenesulfonic acid and pyrrole are dissolved in water to make the p-toluenesulfonate containing 0.01mol / L, 0.3mol / L p-toluene Sulfonic acid and 0.4mol / L pyrrole mixture; then LiCoO 2 , conductive carbon black and polytetrafluoroethylene are mixed in the mass ratio of 90:5:5 to form a mixture, and the mass concentration of the mixture obtained by adding 1-methyl 2-pyrrolidone solvent into the mixture is 80% slurry; Coat the slurry with a thickness of 1000 μm on the aluminum foil and dry to prepare the lithium-ion battery cathode. 2 Polymerization at low temperature for 300 seconds, cleaning the surface of the electrode with deionized water, and heat treatment at 150°C for 18 hours.

Embodiment 3

[0017] Embodiment 3: at first sodium p-toluenesulfonate, p-toluenesulfonic acid and pyrrole are dissolved in water to make the p-toluenesulfonate containing 0.3mol / L, 0.5mol / L p-toluene Sulfonic acid and 0.1mol / L pyrrole mixture; then LiNiO 2 , conductive carbon black and polyvinylidene fluoride are mixed in the mass ratio of 80:7:13 to form a mixture, and the mass concentration of the mixture obtained by adding 1-methyl 2-pyrrolidone solvent to the mixture is 60% slurry; Coat the slurry with a thickness of 400 μm on the aluminum foil and dry to prepare the lithium-ion battery cathode. 2 Polymerization at low temperature for 150 seconds, cleaning the surface of the electrode with deionized water, and heat treatment at 300°C for 1 hour.

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