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Lithium ion battery positive electrode plate and lithium ion battery negative electrode plate, making methods thereof, roll core, and lithium ion battery

A lithium ion battery, positive and negative plate technology, applied in electrode manufacturing, battery electrodes, electrode current collector coating, etc., can solve the problem of the inner layer plate easily broken and other problems, achieve energy density improvement, tight coordination, increase The effect of compaction density

Pending Publication Date: 2017-07-11
ZHENGZHOU BAK BATTERY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a positive and negative plate of a lithium ion battery and a preparation method thereof to solve the problem that the inner plate of the positive and negative plates is easily broken in the production process of the existing lithium ion battery

Method used

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  • Lithium ion battery positive electrode plate and lithium ion battery negative electrode plate, making methods thereof, roll core, and lithium ion battery
  • Lithium ion battery positive electrode plate and lithium ion battery negative electrode plate, making methods thereof, roll core, and lithium ion battery
  • Lithium ion battery positive electrode plate and lithium ion battery negative electrode plate, making methods thereof, roll core, and lithium ion battery

Examples

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Embodiment 1

[0039] A kind of positive and negative plate of lithium ion battery, wherein, the electrode material of positive plate is lithium manganate according to mass ratio: the mixed positive electrode system that nickel cobalt manganese=3:7 forms, and positive plate comprises positive electrode current collector layer, positive electrode positive surface material layer and positive electrode cathode material layer; and the areal density of the electrode material of the positive electrode cathode material is 40% of the total electrode material areal density of the positive pole plate, and the areal density of the electrode material of the positive anode material is 40% of the total electrode material areal density of the positive pole plate 60%; the electrode material of the negative plate is a graphite system, and the negative plate includes a negative current collector layer, a negative anode material layer and a negative negative material layer; and the areal density of the electrode...

Embodiment 2

[0042] A lithium ion battery positive and negative plates, wherein the electrode material of the positive plate is a lithium cobaltate system, and the positive plate includes a positive current collector layer, a positive anode material layer and a positive negative material layer; and the electrode material of the positive anode material The areal density is 62% of the areal density of the total electrode material of the positive plate, and the areal density of the electrode material of the positive negative side material is 38% of the areal density of the total electrode material of the positive plate; the electrode material of the negative plate is a graphite system, and the negative plate includes Negative electrode current collector layer, negative electrode anode material layer and negative electrode negative surface material layer; And the areal density of the electrode material of the negative electrode anode material is 62% of the total electrode material areal density ...

Embodiment 3

[0045] A lithium ion battery positive and negative plates, wherein the electrode material of the positive plate is lithium cobaltate: nickel cobalt manganese=7.5:2.5 mixed material system, and the positive plate includes a positive current collector layer, a positive anode material layer and a positive negative material layer; and the areal density of the electrode material of the positive anode material is 58% of the total electrode material areal density of the positive pole plate, and the areal density of the electrode material of the positive pole cathode material is 42% of the total electrode material areal density of the positive pole plate; The electrode material is a graphite system, and the negative plate includes a negative electrode current collector layer, a negative anode material layer and a negative electrode negative material layer; and the areal density of the electrode material of the negative anode material is 58% of the total electrode material areal density ...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and concretely discloses a lithium ion battery positive electrode plate and a lithium ion battery negative electrode plate, making methods thereof, a roll core, and a lithium ion battery. In the lithium ion battery positive electrode plate and the lithium ion battery negative electrode plate, the positive / negative electrode plate comprises a positive / negative electrode current collector layer, a positive / negative electrode light surface material layer and a positive / negative electrode shadow surface material layer; the positive electrode light surface material layer and the positive electrode shadow surface material layer are respectively arranged on two external surfaces of the positive electrode current collector layer; the negative electrode light surface material layer and the negative electrode shadow surface material layer are respectively arranged on two external surfaces of the negative electrode current collector layer; the surface density of the electrode material in the shadow material layer is 30-48% of the surface density of the total electrode material of the corresponding electrode plate; and the surface density of the electrode material in the light material layer is 52-70% of the surface density of the total electrode material of the corresponding electrode plate. The above positive and negative plate structure makes the positive electrode plate closely cooperate with the negative electrode plate in order to effectively increase the compacted density of the positive electrode plate and the negative electrode plate, so the energy density of the finally obtained lithium ion battery is improved by at least 8.5%.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a positive and negative plate of a lithium ion battery, a preparation method thereof, a winding core and a lithium ion battery. Background technique [0002] Secondary lithium-ion batteries have many advantages such as large specific capacity, long charge and discharge life, no memory effect, and low environmental pollution. Since their commercialization in the early 1990s, they have quickly replaced nickel-cadmium and nickel-metal hydride batteries and are widely used. In portable electrical appliances such as mobile phones, notebook computers, and video cameras. And there is a trend of developing into new fields such as electric vehicles, aerospace, and energy storage power stations. However, there is always room for improvement in the energy density of lithium-ion batteries. [0003] The traditional positive and negative plates of lithium-ion batteries are coat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M4/04H01M10/0525H01M10/0587
CPCH01M4/0404H01M4/13H01M4/139H01M10/0525H01M10/0587Y02E60/10Y02P70/50
Inventor 闫国伟肖斌方送生
Owner ZHENGZHOU BAK BATTERY CO LTD
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