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Positive electrode and positive electrode paste with high energy density, and battery containing positive electrode

A high-energy density, positive electrode slurry technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor long cycle life, poor cell rate, low battery energy density, etc., and achieve excellent low-temperature discharge effect.

Inactive Publication Date: 2016-04-06
MCNAIR TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The amount added is mostly 0.8%~1.2%, and its dosage cannot be reduced basically. Therefore, the battery has problems such as low energy density, poor cell rate, poor long cycle life, and high cost.

Method used

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  • Positive electrode and positive electrode paste with high energy density, and battery containing positive electrode
  • Positive electrode and positive electrode paste with high energy density, and battery containing positive electrode
  • Positive electrode and positive electrode paste with high energy density, and battery containing positive electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0044] This embodiment provides a positive electrode slurry with high energy density, which includes the following components in parts by weight:

[0045] 100 parts of positive electrode active material;

[0046] Composite conductive agent 0.04 part;

[0047] 0.9 parts of polyvinylidene fluoride;

[0048] 42.4 parts of N-methylpyrrolidone;

[0049] The composite conductive agent includes single-wall carbon nanotubes and graphene, and the mass ratio of single-wall carbon nanotubes and graphene is 3:1;

[0050] Single-walled carbon nanotubes are composed of a single cylindrical graphite layer with a specific surface area of ​​600m 2 / g, the tube diameter is 1.2nm, the tube length is greater than 5μm, and the electron mobility is greater than 2×10 5 cm2 / V·s.

[0051] The specific surface area of ​​graphene is 2000m 2 / g or more, the electron mobility of graphene is greater than or equal to 1.5×10 5 cm2 / V·s.

[0052] Its preparation method comprises the following steps:

...

Embodiment 2

[0059] Different from Example 1, the positive electrode slurry with high energy density provided in this example includes the following components in parts by weight:

[0060] 100 parts of lithium nickel cobalt manganate;

[0061] Composite conductive agent 0.08 part;

[0062] 0.9 parts of polyvinylidene fluoride;

[0063] 46.9 parts of N-methylpyrrolidone;

[0064] The mass ratio of single-walled carbon nanotubes to graphene is 2:1; the specific surface area of ​​single-walled carbon nanotubes is 550m 2 / g, the tube diameter is 1.5nm.

[0065] Its preparation method comprises the following steps:

[0066] In the first step, add polyvinylidene fluoride dry powder into N-methylpyrrolidone, and stir evenly in a power mixing device for 3.3 hours to prepare polyvinylidene fluoride glue;

[0067] In the second step, the single-walled carbon nanotube dry powder is mixed with the graphene dry powder, polyethylene glycol is added, and the conductive glue is dispersed in the grind...

Embodiment 3

[0071] Different from Example 1, the positive electrode slurry with high energy density provided in this example includes the following components:

[0072] 100 parts of lithium manganate;

[0073] Composite conductive agent 0.03 part;

[0074] 2.2 parts of polyvinylidene fluoride;

[0075] 47.5 parts of N-methylpyrrolidone;

[0076] The mass ratio of single-walled carbon nanotubes to graphene is 5:1; the specific surface area of ​​single-walled carbon nanotubes is 650m 2 / g, the tube diameter is 1.0nm.

[0077] The rest are the same as in Embodiment 1, and will not be repeated here.

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Abstract

The invention relates to a positive electrode and positive electrode paste with high energy density, and a battery containing the positive electrode, in particular to the positive electrode paste with high energy density, belonging to the technical field of batteries. The positive electrode paste with high energy density comprises the following constituents based on weight: 100 parts of positive active substance, 0.01-0.1 part of composite conductive agent, 0.4-3.0 parts of adhesive and 30-50 parts of solvent, wherein the composite conductive agent comprises a single-walled carbon nanotube and graphene, the mass ratio of the single-walled carbon nanotube to the graphene is (0.1-10):1, the specific surface area of the single-walled carbon nanotube is 500-700 m<2> / g, the tube diameter is 0.7-1.8 nanometers, the tube length is more than 5 micrometers, and the specific surface area of the graphene is over 2,000 m<2> / g. Compared with the prior art, the positive electrode paste has the advantages that by adjusting the formula and the dosage of the conductive agent, the energy density can be effectively improved, and the cost is relatively low.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a positive electrode with high energy density, its slurry and a battery containing the positive electrode. Background technique [0002] Lithium-ion batteries generally include a positive electrode sheet, a negative electrode sheet, a separator between the positive and negative electrode sheets, and an electrolyte, wherein the positive electrode sheet includes a positive electrode collector and a positive electrode coating distributed on the positive electrode collector, and the negative electrode sheet includes A negative electrode collector and a negative electrode coating distributed on the negative electrode collector. The positive electrode coating generally includes positive electrode active materials, conductive agents, and binders, etc., and the negative electrode coating generally includes negative electrode active materials, conductive agents, and binders....

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/04H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/04H01M4/625H01M10/0525Y02E60/10
Inventor 石海敏邓耀明庞佩佩宋晓娜周训富钱小芳殷子玲李中延
Owner MCNAIR TECH
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