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Battery material, battery pole piece, preparation method of battery pole piece and battery

A technology of battery materials and battery pole pieces, applied in battery electrodes, secondary batteries, secondary battery repair/maintenance, etc., can solve problems such as large energy consumption, environmental pollution, toxicity, etc.

Inactive Publication Date: 2021-07-27
KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The entire preparation process requires the use of organic solvents, which not only consume a lot of energy for electrode drying and solvent recovery, but also the solvent itself has certain toxicity, which is easy to endanger the health of personnel and cause environmental pollution
In addition, the existing battery pole pieces also have the problem that the battery material is easy to crack and fall off.

Method used

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  • Battery material, battery pole piece, preparation method of battery pole piece and battery
  • Battery material, battery pole piece, preparation method of battery pole piece and battery
  • Battery material, battery pole piece, preparation method of battery pole piece and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] This embodiment provides a positive pole piece, which is prepared according to the following steps:

[0038] Under the environment of dew point -40°C in the drying room, take 9g of lithium iron phosphate, 0.8g of polymer binder PTFE, 0.1g of hot-melt polymer material PE, and 0.1g of conductive agent SP (conductive carbon black) for mechanical Stir to disperse, the stirring speed is 15000rpm, and the stirring time is 10min. After the stirring is finished, a mixture is obtained. The obtained mixture is heated and rolled, the temperature of the roller is 150°C, and the number of times of rolling is 1 time to obtain a flat self-supporting diaphragm with a thickness of 120um; the carbon-coated aluminum foil is used as the current collector, and the current collector and the diaphragm are rolled. Composite, the temperature of the roller is 100°C, the number of times of rolling is 2 times, and the positive electrode of the battery is obtained.

[0039] see figure 1 , figur...

Embodiment 2

[0041] This embodiment provides a positive pole piece, which is prepared according to the following steps:

[0042] In a drying room with a dew point of -45°C, take 9.2g of NCM811 (nickel-cobalt-manganese ternary material), 0.6g of polymer binder PTFE, 0.1g of hot-melt polymer material PMMA, and 0.1g of conductive agent Ketjen Black. g, carry out mechanical stirring and dispersing, the stirring speed is 18000rpm, and the stirring time is 20min. After the stirring is finished, a mixture is obtained. The obtained mixture is heated and rolled, the temperature of the roller is 140°C, and the number of times of rolling is 1 time to obtain a flat self-supporting diaphragm with a thickness of 70um; the carbon-coated aluminum foil is used as the current collector, and the current collector and the diaphragm are rolled. Composite, the temperature of the roller is 120°C, the number of times of rolling is 2 times, and the positive electrode sheet is obtained.

Embodiment 3

[0044] This embodiment provides a positive pole piece, which is prepared according to the following steps:

[0045] Take 8.6g of NCM523 (nickel-cobalt-manganese ternary material), 0.8g of polymer binder PTFE, 0.4g of hot-melt polymer material PP, and 0.2g of conductive agent acetylene black in a drying room with a dew point of -50°C , carry out mechanical stirring and dispersing, the stirring speed is 18000rpm, and the stirring time is 15min. After the stirring is finished, a mixture is obtained. The obtained mixture is heated and rolled, the temperature of the roller is 140°C, and the number of times of rolling is 1 time to obtain a flat self-supporting diaphragm with a thickness of 90um; the carbon-coated stainless steel foil is used as the current collector, and the current collector and the diaphragm are rolled Press and compound, the temperature of the roller is 100° C., and the number of times of rolling is 2 times to obtain the positive electrode of the battery.

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Abstract

The invention discloses a battery material, a battery pole piece, a preparation method of the battery pole piece and a battery. The battery material comprises a battery active material, a fibrosis binder and a hot-melt high polymer material, and the softening point temperature of the hot-melt high polymer material is 90-180 DEG C. The fibrosis binder and the hot-melt high polymer material are matched for use, so that the subsequent bonding between the battery active material and a current collector and the full contact between the battery material and the electrolyte can be realized at the same time, and the bonding performance and the electrochemical performance of the prepared battery pole piece are further improved at the same time.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a battery material, a battery pole piece, a preparation method thereof, and a battery. Background technique [0002] With the increasingly serious problem of energy shortage and the continuous improvement of people's awareness of environmental protection, the development of green and environmentally friendly energy has become the focus of today's social development. Lithium-ion batteries have been widely used in mobile devices such as mobile phones and computers, new transportation methods such as electric vehicles and electric ships, and large-scale energy storage fields such as energy storage power stations due to their advantages such as high working voltage, long cycle life, and high energy density. [0003] The traditional lithium-ion battery electrode preparation is made by mixing active materials, conductive agents, binders, etc. with solvents to form a slurry, which is ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/62H01M10/42
CPCH01M4/362H01M4/622H01M4/621H01M10/4235Y02E60/10
Inventor 蔡挺威刘永飞梁世硕
Owner KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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