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Novel negative electrode current collector, negative electrode composed of novel negative electrode current collector and lithium ion battery

A lithium-ion battery and current collector technology, applied in the direction of electrode carrier/current collector, battery electrode, secondary battery, etc., to achieve high energy density, speed up coating efficiency, and alleviate the effect of fracture

Active Publication Date: 2021-06-11
ZHEJIANG NARADA POWER SOURCE CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the embodiments of the present invention is to solve the defects of the existing technology, to provide a lightweight new conductive negative electrode current collector and the lithium ion battery negative electrode and lithium ion battery composed of it. The application of this technical solution can not only solve the problem of lightweight lithium ion batteries It is also beneficial to improve the energy density and cycle performance of lithium batteries

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  • Novel negative electrode current collector, negative electrode composed of novel negative electrode current collector and lithium ion battery
  • Novel negative electrode current collector, negative electrode composed of novel negative electrode current collector and lithium ion battery
  • Novel negative electrode current collector, negative electrode composed of novel negative electrode current collector and lithium ion battery

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preparation example Construction

[0047] The preparation of the positive electrode sheet is as follows: the positive electrode slurry is coated on the current collector, where the current collector is preferably aluminum, and its thickness is 9-16 microns, and the thickness of the positive electrode slurry coated on the surface of the current collector is 0.3 Micron to 0.8 micron, coating weight from 0.4g / m2 to 1.5g / m2 2 . This current collector has the characteristics of light weight and good electrical conductivity, and has great advantages in the extension and tensile strength of the pole piece.

[0048] The composition of the positive electrode slurry is the mass ratio of positive electrode material: conductive agent: binder = 96:2.3:1.7. The positive electrode material is composed of a layered ternary material and a one-dimensional olivine structure lithium iron phosphate material, which can be a ternary single material NCM111, NCM622, NCM523, or one or two of iron lithium materials, LFP, LMFP, It can a...

Embodiment 1

[0052] The surface density is 2g / m 2 , a melting point of 600° C., a thickness T0 of 2 μm, and a colorless and transparent base layer. And the base layer is grid-like. The conductive metal layer is prepared by a simple electroless plating method. The metal used is copper, which is peeled off to the base layer and left evenly. The thickness of the conductive metal layer is 6μm, and the surface density is 10g / m 2 , the sum of the surface density of it and the base layer is 12g / m 2 .

[0053] A porous conductive layer with a mass ratio of conductive agent to high molecular polymer of 8:2 is attached to the conductive metal layer, wherein the particle size of the conductive agent is between 1 nm, and it is uniformly distributed on the surface of the high molecular polymer. The polymer is polyvinylidene fluoride, and no additional solvent is needed in the process. A very thin composite binder layer is coated on the surface of the porous conductive layer, the main substance of t...

Embodiment 2

[0060] The surface density is 4g / m 2 , with a melting point of 1300° C. and a thickness T0 of 2 μm, is a colorless and transparent base layer, and the base layer is grid-like. The conductive metal layer is prepared by a simple electroless plating method. The metal used is copper, which is peeled off to the base layer and left evenly. The thickness of the conductive metal layer is 6μm, and the surface density is 10g / m 2 , the sum of the surface density of it and the base layer is 12g / m 2 .

[0061] A porous conductive layer with a mass ratio of conductive agent to high molecular polymer of 8:2 is attached to the conductive layer, wherein the particle size of the conductive agent is between 1nm, which is evenly distributed on the surface of the high molecular polymer, and the high molecular polymer is polymerized The material is polyvinylidene fluoride, and no additional solvent is added during the process. A very thin composite binder layer is coated on the surface of the po...

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Abstract

The invention discloses a novel negative electrode current collector, a negative electrode composed of the novel negative electrode current collector and a lithium ion battery. A negative electrode piece comprises a substrate layer, a conductive metal layer, a porous conductive layer and a composite binder layer. The invention further discloses a preparation method of the negative plate and a lithium ion secondary battery manufactured by using the negative plate. The weight and the size of the negative plate are reduced, the energy density of the lithium ion secondary battery is improved, the conductivity of the negative plate is relatively good, the problem that lithium ions are separated out and deposited under the high power of the battery is solved, and finally, the safe and reliable lithium ion battery with ultrahigh energy density is obtained.

Description

technical field [0001] The patent of the invention belongs to the technical field of lithium ion batteries, and relates to a new type of negative electrode current collector and the negative electrode and lithium ion battery composed of it, specifically a lightweight new conductive negative electrode current collector and the lithium ion battery negative electrode and lithium ion battery composed of it. ion battery. Background technique [0002] At present, lithium-ion batteries are widely used in power, energy storage, communication, civil two-wheeled vehicles and other markets. Their wide application has led various researchers to conduct a series of research on lithium-ion batteries. However, with the continuous changes in market demand, The requirements for the energy density and volume density of lithium-ion batteries continue to increase, so there is an urgent need to solve the problems of lightweight and high-performance lithium-ion batteries, and it is imminent to fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/133H01M10/0525
CPCH01M4/667H01M4/661H01M4/668H01M4/133H01M10/0525Y02E60/10
Inventor 李艳红王盈来刘月学郭锋相佳媛
Owner ZHEJIANG NARADA POWER SOURCE CO LTD
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