Negative current collector, negative pole piece and electrochemical device

A technology of negative pole piece and current collector, which is applied in the field of electrochemical devices, can solve the problems of low energy density, high density, and large thickness of lithium-ion secondary batteries, and achieve good comprehensive electrochemical performance, high weight energy density, good The effect of conduction and current collection

Active Publication Date: 2020-03-31
CONTEMPORARY AMPEREX TECH CO
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The metal current collectors used in the prior art have relatively large thickness (usually 18 μm to 30 μm) and high density, resulting in low energy density of lithium-ion secondary batteries, which cannot meet the increasingly high requirements of the market

Method used

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  • Negative current collector, negative pole piece and electrochemical device
  • Negative current collector, negative pole piece and electrochemical device
  • Negative current collector, negative pole piece and electrochemical device

Examples

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Embodiment

[0138] The following examples describe the present disclosure more specifically, and these examples are for illustrative purposes only, since various modifications and changes within the scope of the present disclosure will be apparent to those skilled in the art. Unless otherwise stated, all parts, percentages, and ratios reported in the following examples are based on weight, and all reagents used in the examples are commercially available or synthesized according to conventional methods, and can be directly The instruments used without further processing, as well as in the examples, are commercially available.

[0139] Preparation

[0140] Preparation of negative electrode collector

[0141] Select a support layer with a predetermined thickness and perform surface cleaning treatment, place the support layer after surface cleaning treatment in a vacuum plating room, and melt and evaporate the high-purity copper wire in the metal evaporation room at a high temperature of 1...

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Abstract

The invention discloses a negative current collector, a negative pole piece and an electrochemical device. The negative current collector comprises a support layer and a conductive layer arranged on at least one of two opposite surfaces in the thickness direction of the support layer, wherein the density of the support layer is smaller than that of the conductive layer; the thickness D1 of the conducting layer is larger than or equal to 300 nm and smaller than or equal to 2 micrometers, and preferably, D1 is larger than or equal to 500 nm and smaller than or equal to 1.5 micrometers. When thetensile strain of the negative current collector is 1.5%, the square resistance growth rate T of the conductive layer is less than or equal to 5%. The negative electrode current collector provided bythe invention can simultaneously consider low weight and good conductivity and current collection performance, so that the electrochemical device can simultaneously consider relatively high weight energy density and good comprehensive electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of electrochemical devices, and in particular relates to a negative electrode current collector, a negative electrode sheet and an electrochemical device. Background technique [0002] Due to the advantages of high energy density, high output power, long cycle life and low environmental pollution, lithium-ion secondary batteries are widely used in electric vehicles and consumer electronics products. With the continuous expansion of the application range of lithium-ion secondary batteries, people have put forward higher and higher requirements for the energy density of lithium-ion secondary batteries. The metal current collectors used in the prior art have relatively large thickness (usually 18 μm to 30 μm) and high density, resulting in low energy density of lithium-ion secondary batteries, which cannot meet the increasingly high requirements of the market. Therefore, how to improve the energy density of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/13H01M10/058
CPCH01M4/667H01M4/661H01M4/13H01M10/058H01M10/0525H01M2220/20Y02E60/10H01M4/366H01M4/668Y02P70/50H01M2004/027H01M4/131H01M4/525H01M4/70
Inventor 梁成都刘欣黄起森
Owner CONTEMPORARY AMPEREX TECH CO
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