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A kind of positive electrode of high energy density lithium ion battery and preparation method thereof

A lithium-ion battery, high energy density technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of high energy density of lithium-ion batteries, low energy density of lithium-ion batteries, poor processing performance of ternary materials, etc. Achieve the effect of being beneficial to compaction density, excellent physical and electrochemical properties, and improving processability and compaction density

Active Publication Date: 2017-04-19
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to solve the problem of poor processability of ternary materials in the prior art and low energy density of lithium-ion batteries produced, and provides a positive electrode of lithium-ion batteries with high energy density. The positive electrode has excellent processability and uses a single nickel The cobalt-manganese ternary material is used as the positive electrode active material, and the lithium-ion battery produced has high energy density and low production cost

Method used

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  • A kind of positive electrode of high energy density lithium ion battery and preparation method thereof
  • A kind of positive electrode of high energy density lithium ion battery and preparation method thereof
  • A kind of positive electrode of high energy density lithium ion battery and preparation method thereof

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Embodiment 1

[0036] (1) Based on the total mass of the positive electrode material, weigh each component according to the ratio of 90% positive electrode active material, 4.8% conductive agent, 5% binder, and 0.2% organic weak acid. Among them, the positive electrode active material is LiNi 0.5 mn 0.3 co 0.2 o 2 , the average particle size of the positive electrode active material is 10 μm, and the binder is a composite binder composed of the following components by mass percentage: sodium alginate 12%, polyvinylidene fluoride 80%, casein 8%, and the conductive agent is Conductive carbon black, organic weak acid is acetic acid.

[0037] (2) Add the positive electrode active material into ethanol for ultrasonic treatment for 30 minutes and then dry it. The ultrasonic conditions for ultrasonic treatment are: frequency 10KHz, power 300W.

[0038] (3) Dry the binder in vacuum at 70°C for 16 hours, then add it to N-methylpyrrolidone at a temperature of 50°C to dissolve completely, then add t...

Embodiment 2

[0046] (1) Based on the total mass of the positive electrode material, weigh each component according to the ratio of 91.9% positive electrode active material, 5% conductive agent, 3% binder, and 0.1% organic weak acid. Among them, the positive electrode active material is LiNi 0.6 mn 0.3 co 0.1 o 2 , the average particle size of the positive electrode active material is 20 μm, and the binder is a composite binder composed of the following components by mass percentage: 15% sodium alginate, 82% polyvinylidene fluoride, 3% casein, and a conductive agent of Conductive carbon black and carbon nanotubes in equal mass proportions, and organic weak acid are acetic acid and malic acid in equal mass proportions.

[0047] (2) Add the positive electrode active material into ethanol for ultrasonic treatment for 40 minutes and then dry it. The ultrasonic conditions for ultrasonic treatment are: frequency 15KHz, power 200W.

[0048] (3) Dry the binder in vacuum at 75°C for 14 hours, the...

Embodiment 3

[0056] (1) Based on the total mass of the positive electrode material, weigh each component according to the ratio of 90-95% positive active material, 1-5% conductive agent, 3-5% binder, and 0.1-0.5% organic weak acid, Among them, the positive active material is LiNi 0.7 mn 0.2 co 0.1 o 2 , the average particle size of the positive electrode active material is 10~30μm, the binder is a composite binder composed of the following components by mass percentage: sodium alginate 10%, polyvinylidene fluoride 85%, casein 5%, conductive The agent is conductive carbon black, superconducting carbon, conductive graphite and flake graphite, and the organic weak acid is acetic acid, malic acid and citric acid.

[0057] (2) Add the positive electrode active material into ethanol for 30-60 minutes of ultrasonic treatment, and then dry it. The ultrasonic conditions for ultrasonic treatment are: frequency 20KHz, power 100W.

[0058] (3) Dry the binder in vacuum at 80°C for 12 hours, then ad...

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Abstract

The invention discloses a high-energy density lithium ion battery positive electrode, comprising a positive current collector and a positive electrode material coating the positive current collector, wherein the positive electrode material is prepared from, by mass, 90 to 95% of a positive electrode active substance, 1 to 5% of a conductive agent, 3 to 5% of a binder and 0.1 to 0.5% of organic weak acid. The positive electrode active substance is LiNixMnyCozO2, wherein x is no less than 0.5 and less than 1.0, y is more than 0 and less than 0.5, and x + y + z is equal to 1; the average particle size of the positive electrode active substance is 10 to 30 mu m. The positive electrode has excellent processing properties and uses a single nickel-cobalt-manganese ternary material as the positive electrode active substance; a prepared lithium ion battery has high energy density and low production cost. The invention also discloses a preparation method for the high-energy density lithium ion battery positive electrode. The method has simple process steps and is suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a high-energy-density lithium-ion battery positive electrode using a single cobalt-nickel-manganese ternary material as the positive electrode active material and a preparation method thereof. Background technique [0002] At present, there are four main positive electrode active materials used in lithium-ion batteries: lithium cobaltate, lithium nickelate, lithium manganate and lithium iron phosphate, among which the positive electrode materials that have been successfully commercialized are lithium cobaltate, lithium manganate and iron phosphate Lithium, but the specific capacity of lithium manganate is low, and the capacity attenuation is serious at high temperature; lithium iron phosphate has disadvantages such as low discharge voltage, tap density and low specific capacity; lithium nickelate is easy to generate non-stoichiometric ratio during preparation Produc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/131H01M4/1391
CPCH01M4/131H01M4/1391H01M4/505H01M4/525H01M4/62H01M4/622H01M10/0525Y02E60/10
Inventor 付正伟
Owner WANXIANG 123 CO LTD