Lithium ion battery positive plate and preparation method thereof

A lithium-ion battery and positive electrode technology, which is applied to battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problems of poor safety performance of lithium-ion battery positive electrodes, avoid internal short circuits, improve safety performance, highly operable effect

Inactive Publication Date: 2017-11-07
WANXIANG 123 CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problem of poor safety performance of the lithium-ion battery positive plate in the prior art, and provides a lithium-ion battery that ca

Method used

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  • Lithium ion battery positive plate and preparation method thereof

Examples

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Effect test

Embodiment 1

[0027] Such as figure 1 A positive electrode sheet of a lithium ion battery is shown, comprising a positive electrode current collector 1, the surface of the positive electrode current collector is coated with a positive electrode material layer 2, the surface of the positive electrode material layer is coated with a separator layer 3, and the positive electrode material layer is composed of the following components in mass percentage Made: 55% positive electrode active material (nickel cobalt lithium manganese oxide), 3% first binder (polyvinylidene fluoride), 1% conductive agent (conductive carbon black), and the balance is the first organic solvent (N- methylpyrrolidone); the isolation layer is made of the following components by mass percentage: 62% nano-silica, 1.5% second binder (polyvinylidene fluoride), 0.5% sodium naphthalenesulfonate formaldehyde condensate, 1% ethanol, and the balance is the second organic solvent (N-methylpyrrolidone).

[0028] The positive electr...

Embodiment 2

[0034] Such as figure 1 A positive electrode sheet of a lithium ion battery is shown, comprising a positive electrode current collector 1, the surface of the positive electrode current collector is coated with a positive electrode material layer 2, the surface of the positive electrode material layer is coated with a separator layer 3, and the positive electrode material layer is composed of the following components in mass percentage Made: 60% positive electrode active material (nickel cobalt lithium manganate), 5% first binder (polytetrafluoroethylene), 3% conductive agent (conductive graphite), and the balance is the first organic solvent (N-formazan base pyrrolidone); the isolation layer is made of the following components by mass percentage: 65% nano-silica, 2% second binder (polytetrafluoroethylene), 1% sodium naphthalenesulfonate formaldehyde condensate, 3% ethanol , and the balance is the second organic solvent (N-methylpyrrolidone).

[0035] The positive electrode sh...

Embodiment 3

[0041] Such as figure 1 A positive electrode sheet of a lithium ion battery is shown, comprising a positive electrode current collector 1, the surface of the positive electrode current collector is coated with a positive electrode material layer 2, the surface of the positive electrode material layer is coated with a separator layer 3, and the positive electrode material layer is composed of the following components in mass percentage Made: 58% positive electrode active material (nickel cobalt lithium manganese oxide), 4% first binder (mass ratio of polyvinylidene fluoride to polytetrafluoroethylene 1:1), 1~3% conductive agent (conductive carbon black and conductive graphite mass ratio 1:2), the balance is the first organic solvent (N-methylpyrrolidone); the isolation layer is made of the following components by mass percentage: 63% nano-silica, 1.8% second bond agent (polyvinylidene fluoride and polytetrafluoroethylene mass ratio 1:1), 0.6% sodium naphthalenesulfonate formald...

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Abstract

The invention discloses a lithium ion battery positive plate, which comprises a positive current collector. A cathode material layer is painted on the surface of the positive current collector. An isolation layer is painted on the surface of the cathode material layer. The cathode material layer is prepared from the following components in percentage by weight: 55 to 60% of positive active material, 3 to 5% of first binder, 1 to 3% of conductive agent, and the balance being a first organic solvent. The isolation layer is prepared from the following components in percentage by weight: 62 to 65% of nano silicon dioxide, 1.5 to 2% of second binder, 0.5 to 1% of sodium naphthalene sulfonate-formaldehyde condensate, 1 to 3% of ethanol, and the balance being a second organic solvent. The positive plate cannot be dissolved or oxidized, the safety of battery is improved, and the safety risk of lithium battery is reduced. The invention also discloses a preparation method of the lithium ion battery positive plate. The preparation technology is simple, there is not special requirement on equipment, the preparation cost is low, the operability is strong, and the method is suitable for large scale industrial production.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery positive plate and a preparation method thereof. Background technique [0002] With the continuous consumption of primary traditional energy, human beings are more and more worried about the depletion of traditional energy (coal, oil, etc.), so more and more attention is paid to the research on secondary energy and energy storage and conversion equipment. Due to its unique advantages such as environmental protection, high energy density, long cycle life, and low self-discharge, lithium-ion batteries have gradually attracted attention in energy storage and conversion research. Long-term energy storage and continuous recycling require lithium-ion batteries to have long-term stability, high temperature performance and high safety performance. [0003] The positive electrode sheet of lithium-ion battery is the most important part of the battery sy...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M4/505H01M4/62H01M2/16H01M4/139H01M4/13H01M10/0525H01M50/446
CPCH01M4/13H01M4/139H01M4/505H01M4/525H01M4/623H01M4/625H01M10/0525H01M50/446Y02E60/10
Inventor 谭歌韩笑
Owner WANXIANG 123 CO LTD
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