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Lithium-ion battery negative electrode and lithium-ion battery

A lithium-ion battery and negative electrode technology, applied in the field of lithium-ion battery negative electrode and lithium-ion battery, can solve the problems affecting the high-current discharge cycle performance and instantaneous rate discharge performance of the battery, fire, self-overheating, etc.

Inactive Publication Date: 2019-08-16
河南比得力高新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, power lithium-ion batteries include square batteries and cylindrical batteries; there are liquid batteries and polymer batteries; no matter which type of battery has the problem of overheating itself, if the lithium-ion battery itself overheats, it will not only cause the battery itself to run out of heat, but also It will smoke, catch fire, even explode, and cause fire, causing many unnecessary losses. The existing technology mainly uses methods such as changing the battery structure, using flame-retardant electrolyte, gel electrolyte, material coating, and adding conductive agents. Prevent thermal runaway of the battery, but the above methods often lead to changes in the energy density of the battery, affecting the high-current discharge cycle performance and instantaneous rate discharge performance of the battery

Method used

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  • Lithium-ion battery negative electrode and lithium-ion battery

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Embodiment 1

[0020] A negative electrode of a lithium ion battery, comprising a negative electrode current collector and a negative electrode coating arranged on the surface of the negative electrode current collector, the half-maximum width W of the D002 peak of the negative electrode coating is 0.11°, and the compacted density p range of the negative electrode coating is between 1.1g / m 3 , and the product of width at half maximum W and compacted density ρ ranges from 0.12 to 0.30. The negative electrode coating includes graphite, conductive agent and binder; the negative electrode current collector is copper foil with a thickness of 5 μm to 15 μm. The graphite includes a mixture of artificial graphite, natural graphite, surface-modified graphite, intermediate carbon microspheres and silicon-carbon negative electrode, and the mass ratio of graphite to negative electrode coating is 92-97:100. The average particle diameter D50 of the graphite is 5 μm. The binding agent is a mixture of sod...

Embodiment 2

[0023] A lithium-ion battery negative electrode, comprising a negative electrode current collector and a negative electrode coating arranged on the surface of the negative electrode current collector, the D002 peak of the negative electrode coating has a half-maximum width W in the range of 0.17°, and the compacted density p of the negative electrode coating is in the range at 1.8g / m 3 , and the product of width at half maximum W and compacted density ρ is in the range of 0.30. The negative electrode coating includes graphite, conductive agent and binder; the negative electrode current collector is nickel foil with a thickness of 5 μm to 15 μm. The graphite includes a mixture of artificial graphite and natural graphite, and the mass ratio of graphite to negative electrode coating is 92-97:100. The average particle diameter D50 of the graphite is 25 μm. The binder is a mixture of polyvinylidene fluoride, polytetrafluoroethylene, polyvinyl alcohol and polyacrylic acid; the mas...

Embodiment 3

[0026] A lithium-ion battery negative electrode, comprising a negative electrode current collector and a negative electrode coating arranged on the surface of the negative electrode current collector, the D002 peak of the negative electrode coating has a half-maximum width W in the range of 0.14°, and the compacted density p of the negative electrode coating is in the range at 1.45g / m 3 , and the product of width at half maximum W and compacted density ρ is in the range of 0.20. The negative electrode coating includes graphite, conductive agent and binder; the negative electrode current collector is a polymer conductive film with a thickness of 5 μm to 15 μm. The graphite includes a mixture of intermediate carbon microspheres and a silicon-carbon negative electrode, and the mass ratio of the graphite to the negative electrode coating is 92-97:100. The average particle diameter D50 of the graphite is 15 μm. The binder is a mixture of sodium carboxymethyl cellulose, styrene-bu...

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Abstract

The invention belongs to a lithium-ion battery negative electrode and a lithium-ion battery. The lithium-ion battery negative electrode comprises a negative current collector and a negative coating arranged on the surface of the negative current collector. The full width at half maximum W of the D002 peak of the negative coating ranges from 0.11 degrees to 0.17 degrees, the compaction density Rhoof the negative coating ranges from 1.1g / m<3> to 1.8g / m<3>, and the product of the full width at half maximum W and the compaction density Rho ranges from 0.12 to 0.30. The preparation of the negativecoating and the lithium-ion battery negative electrode is realized by limiting the range of the full width at half maximum W of the D002 peak of the negative coating, the range of the compaction density Rho of the negative coating and the range of the product of the full width at half maximum W and the compaction density Rho. The electrochemical reactivity of the negative electrode material can be improved to the maximum. The first capacity play of the negative electrode material is improved, and the instantaneous discharge rate performance and high-current discharge cycle performance of thebattery are improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery production, and in particular relates to a lithium-ion battery negative electrode and a lithium-ion battery. Background technique [0002] Lithium-ion batteries have the characteristics of high output voltage, high specific energy, stable discharge voltage and long cycle life. Therefore, lithium-ion batteries have been widely used in notebook computers, digital cameras, and mobile phones. And it has been applied more and more in the field of power and energy storage. The power field and energy storage field are different from the digital field where the energy of a single electrical appliance is several watt-hours to tens of watt-hours. They often require tens of kilowatt-hours or even higher energy, and the cost of a single unit is high, so the cycle life of the battery is also affected. Higher and higher requirements are put forward, and the power field has higher and higher requir...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M10/0525
CPCH01M4/13H01M10/0525Y02E60/10
Inventor 朱全健苑泽保
Owner 河南比得力高新能源科技有限公司