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Quick-charging type high-energy-density lithium ion battery

A lithium-ion battery, high energy density technology, applied in batteries, battery electrodes, secondary batteries, etc., can solve the problems of battery capacity and cycle life decline, achieve excellent cycle performance, improve fast charging performance, and reduce electrochemical reactions The effect of impedance

Inactive Publication Date: 2020-08-28
TIANJIN ENERGIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to achieve more mileage, the vehicle-mounted lithium-ion battery is also continuously improving the energy density, because the rapid charging negative electrode will have the precipitation of metal lithium, which will cause the decline of battery capacity and cycle life, and the fast charging technology under high energy density exists. large vacancy

Method used

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  • Quick-charging type high-energy-density lithium ion battery
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Examples

Experimental program
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Effect test

Embodiment 1

[0045] A fast-charging high-energy-density lithium-ion battery is composed of a positive electrode sheet, a negative electrode sheet, a separator, and an electrolyte. The positive electrode sheet includes a positive electrode collector and a positive electrode material coated on the positive electrode collector, and the negative electrode sheet includes a negative electrode collector and a negative electrode material coated on the negative electrode collector. The active material of the positive plate is lithium nickel cobalt manganese oxide, and the positive electrode material is composed of the following mass percentages: 96% nickel cobalt lithium manganese oxide, 1% conductive carbon black (Super P), 1% CNTs, and 2% polyvinylidene fluoride. The active material of the negative plate is coated artificial graphite, and the negative electrode material is composed of the following mass percentages: 95.5% artificial graphite, 1% conductive carbon black (Super P), 1.5% sodium carbo...

Embodiment 2

[0047] A fast-charging high-energy-density lithium-ion battery is composed of a positive electrode sheet, a negative electrode sheet, a separator, and an electrolyte. The positive electrode sheet includes a positive electrode collector and a positive electrode material coated on the positive electrode collector. The negative electrode sheet includes a negative electrode collector. Fluid and the negative electrode material coated on the negative electrode current collector. The active material of the positive electrode is nickel-cobalt lithium manganese oxide, and the positive electrode material is composed of the following mass percentages: 96% nickel-cobalt lithium manganate, 1% conductive carbon black, 1% CNTs, 2% polyvinylidene fluoride; the negative electrode active material For coated artificial graphite, the negative electrode material is composed of the following mass percentages: 95.5% artificial graphite, 1% conductive carbon black, 1.5% sodium carboxymethyl cellulose,...

Embodiment 3

[0049] A fast-charging high-energy-density lithium-ion battery is composed of a positive electrode sheet, a negative electrode sheet, a separator, and an electrolyte. The positive electrode sheet includes a positive electrode collector and a positive electrode material coated on the positive electrode collector. The negative electrode sheet includes a negative electrode collector. Fluid and the negative electrode material coated on the negative electrode current collector. The active material of the positive electrode is nickel-cobalt lithium manganese oxide, and the positive electrode material is composed of the following mass percentages: 95.5% nickel-cobalt lithium manganese oxide, 1.5% conductive carbon black, 1% CNTs, 2% polyvinylidene fluoride; the negative electrode active material For coated artificial graphite, the negative electrode material is composed of the following mass percentages: 95.5% artificial graphite, 1% conductive carbon black, 1.5% sodium carboxymethyl ...

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Abstract

The invention provides a quick-charging type high-energy density lithium ion battery which comprises a positive pole part, a negative pole part, a diaphragm and an electrolyte. The positive pole partcomprises a positive pole material; the positive electrode material comprises a positive electrode conductive agent, and the positive electrode conductive agent is a mixture of two or more than two ofSuper P, KS-6, VGCF or CNTs; the negative pole part comprises a negative pole material; the negative electrode material comprises artificial graphite, and graphite particles are a mixture of primaryparticles and secondary particles; and the electrolyte is a low-impedance electrolyte. The fast-charging type high-energy-density lithium ion battery provided by the invention has 3C fast-charging capability and excellent cycle performance.

Description

technical field [0001] The invention belongs to the field of lithium-ion power batteries, in particular to a fast-charging high-energy-density lithium-ion battery. Background technique [0002] Since the birth of lithium-ion batteries, they have achieved important applications in many fields. Judging from the current application fields of lithium-ion batteries, not only have they been widely used in electronic products such as mobile phones and chargers, but they have also made certain breakthroughs in fields such as vehicle power supplies. Judging from the current market demand for lithium-ion batteries, fast-charging lithium-ion batteries have become an important development direction for lithium-ion batteries. Especially for pure electric buses with a fixed driving distance and operating version of taxis, the problem of insufficient operating mileage can be solved by improving the fast charging capacity of the battery and reducing the battery load. [0003] Judging from...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/36H01M4/587H01M4/62H01M10/0567H01M10/0569
CPCH01M4/364H01M4/366H01M4/587H01M4/625H01M10/0525H01M10/0567H01M10/0569H01M2220/20H01M2300/0025Y02E60/10
Inventor 孙翠平马华
Owner TIANJIN ENERGIES
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