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Composite cathode material of low-temperature lithium ion battery, cathode plate of low-temperature lithium ion battery, preparation method thereof, and lithium ion battery

A composite cathode material, lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low initial efficiency and energy density, improve the quantity and transmission rate, easy to obtain raw materials, and improve the first discharge. The effect of efficiency

Active Publication Date: 2016-08-31
LUOYANG LIRONG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a composite positive electrode material for low-temperature lithium-ion batteries, thereby solving the problems of low initial efficiency and low energy density of low-temperature lithium-ion batteries in the prior art

Method used

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  • Composite cathode material of low-temperature lithium ion battery, cathode plate of low-temperature lithium ion battery, preparation method thereof, and lithium ion battery
  • Composite cathode material of low-temperature lithium ion battery, cathode plate of low-temperature lithium ion battery, preparation method thereof, and lithium ion battery

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Embodiment 1

[0033] The low-temperature lithium-ion battery composite positive electrode material of this embodiment is composed of components in the following mass ratio: lithium iron phosphate: carbon nanotube / polypropylene composite material: carbon nanofiber: lithium carbonate = 92:1.5:1.5:1.

[0034] The positive electrode sheet of the low-temperature lithium-ion battery of this embodiment includes aluminum foil and a conductive layer and an active material layer that are sequentially coated on the surface of the aluminum foil along the direction away from the aluminum foil. The conductive layer is composed of components with the following mass ratio: graphene: carbon nanotubes : binder=15:3:8; the active material layer is composed of components in the following mass ratio: lithium iron phosphate: carbon nanotube / polypropylene composite material: carbon nanofiber: lithium carbonate: binder=92: 1.5:1.5:1:4; The binder is composed of the following components in weight percentage: polyacr...

Embodiment 2

[0041] The low-temperature lithium-ion battery composite cathode material of this embodiment is composed of components in the following mass ratio: lithium iron phosphate: carbon nanotube / polypropylene composite material: carbon nanofiber: lithium carbonate = 90:2:2:1.

[0042] The positive electrode sheet of the low-temperature lithium-ion battery of this embodiment includes aluminum foil and a conductive layer and an active material layer that are sequentially coated on the surface of the aluminum foil along the direction away from the aluminum foil; the conductive layer is composed of the following mass ratio components: graphene: carbon nanotubes : binder=10:1:5; the active material layer is composed of components in the following mass ratio: lithium iron phosphate: carbon nanotube / polypropylene composite material: carbon nanofiber: lithium carbonate: binder=90: 2:2:1:5; The binder is composed of the following components by weight percentage: polyacrylic acid 30%, polyacryl...

Embodiment 3

[0049] The low-temperature lithium-ion battery composite positive electrode material of this embodiment is composed of components in the following mass ratio: lithium iron phosphate: carbon nanotube / polypropylene composite material: carbon nanofiber: lithium hydroxide=94:1:1:0.5.

[0050] The positive electrode sheet of the low-temperature lithium-ion battery of this embodiment includes aluminum foil and a conductive layer and an active material layer that are sequentially coated on the surface of the aluminum foil along the direction away from the aluminum foil. The conductive layer is composed of components with the following mass ratio: graphene: carbon nanotubes : binder=20:5:10; the active material layer is composed of components in the following mass ratio: lithium iron phosphate: carbon nanotube / polypropylene composite material: carbon nanofiber: lithium hydroxide: binder=94 : 1: 1: 0.5: 3.5; The binder is composed of the following components in weight percentage: polyac...

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Abstract

The invention discloses a composite cathode material of a low-temperature lithium ion battery, a cathode plate of the low-temperature lithium ion battery, a preparation method thereof, and a lithium ion battery. The composite cathode material is composed of lithium iron phosphate, a carbon nano tube / polypropylene composite material, carbon nanofibres and a lithium containing compound, wherein the mass ratio of lithium iron phosphate, the carbon nano tube / polypropylene composite material, carbon nanofibres to the lithium containing compound is (90-94):(1-2):(1-2):(0.5-1). The composite cathode material of the low-temperature lithium ion battery provided by the invention is capable of effectively supplying lithium ions consumed for formation of an SEI film in a process of charging and discharging the lithium ion battery, and providing more lithium ions for the lithium ion battery in a low-temperature charging, discharging and cycling process; the low-temperature performance and the cycle performance of the lithium ion battery are improved; due to the composite cathode material of the low-temperature lithium ion battery provided by the invention, the first-time discharging efficiency of the lithium ion battery can be increased; capacity playing of active substances is promoted; and thus, the energy density of the lithium ion battery is increased.

Description

technical field [0001] The invention belongs to the technical field of low-temperature lithium-ion batteries, and in particular relates to a low-temperature lithium-ion battery composite positive electrode material, a low-temperature lithium-ion battery positive pole piece and a preparation method thereof, and a lithium-ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high specific energy, light weight, long life and no memory effect, and are widely used in various civilian electronic equipment and electric vehicles, energy storage, mobile power and other fields. With the increasing application range of lithium-ion batteries, people have higher requirements for the charging and discharging performance of lithium-ion batteries in low temperature environments. The development of low-temperature lithium-ion batteries that can be used in northern severe cold regions or in the field is of great significance to expand the application fields a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/136H01M4/1397H01M4/36H01M4/58H01M4/62
CPCH01M4/136H01M4/1397H01M4/362H01M4/5825H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 李志王燕刘喜龙
Owner LUOYANG LIRONG NEW ENERGY TECH
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