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Electrochemical device and electronic device

An electrochemical and electrode assembly technology, which is applied in the field of electronic devices, can solve the problems that the energy density and safety of electrochemical devices cannot be effectively guaranteed, and achieve the effects of reducing the risk of lithium analysis, increasing energy density, and increasing charge and discharge rates

Active Publication Date: 2021-11-16
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the energy density and safety of electrochemical devices cannot be effectively guaranteed.

Method used

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  • Electrochemical device and electronic device
  • Electrochemical device and electronic device
  • Electrochemical device and electronic device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] Take the first pole piece as the cathode pole piece and the second pole piece as the anode pole piece as an example:

[0084] Preparation of cathode electrode sheet: dissolving lithium iron phosphate, conductive carbon black and polyvinylidene fluoride in N33-methylpyrrolidone (NMP) solvent at a mass ratio of 96.5:1.5:2.0 to form cathode active material slurry. Aluminum foil is used as the cathode current collector, and the adhesive paper is pasted on the aluminum foil according to the design requirements of the pole piece width. Further, the gravure primer is formed by gravure printing according to the design requirements; After drying and removing the solvent (deionized water) on the cathode collector coated with paper and gravure primer, the cathode sheet is obtained after the processes of stripping, dust removal, cold pressing, tab forming, and cutting.

[0085] Anode sheet preparation: Dissolve graphite, conductive carbon black, sodium carboxymethyl cellulose (CMC)...

Embodiment 2

[0089]The difference from Example 1 is that aluminum oxide and polyacrylic acid are dissolved in N33-methylpyrrolidone (NMP) solvent at a mass ratio of 80:20 to form insulating substance slurry. Paste the adhesive paper on the aluminum foil according to the design requirements of the pole piece width, and further, form a gravure primer by gravure printing according to the design requirements; then apply the cathode active material slurry on the cathode with the adhesive paper and the gravure primer On the current collector, after drying to remove the solvent (deionized water), perform stripping, and coat the insulating material slurry on the cathode current collector exposed after the peeling, and then dry again to remove the solvent (deionized water), and then The cathode sheet is obtained after dust removal, cold pressing, tab forming, and cutting processes.

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Abstract

The invention provides an electrochemical device which comprises an electrode assembly composed of a first pole piece, a second pole piece and a diaphragm arranged between the first pole piece and the second pole piece, the first pole piece comprises a current collector, a tab and an active substance layer, the active substance layer is composed of a main body area and an edge area, the width of the edge area and the width of the main body area are w1 and w2 respectively, and w1 / w2 is larger than 0 and smaller than or equal to 5%, the thicknesses of the edge area and the main body area are t1 and t2 respectively, t1 and t2 satisfy the relation equation that and 95% < = t1 / t2 < = 100%. The edge area with the parameters is beneficial to improving the energy density of the electrochemical device, reducing the lithium precipitation risk and improving the safety of the electrochemical device. In addition, the invention also provides an electronic device.

Description

technical field [0001] The present application relates to an electrochemical device and an electronic device having the electrochemical device. Background technique [0002] With the popularity of consumer electronics products such as notebook computers, mobile phones, handheld game consoles, tablet computers, power banks and drones, people have increasingly stringent requirements on electrochemical devices (eg, lithium-ion batteries). [0003] However, the energy density and safety of electrochemical devices cannot be effectively guaranteed. Contents of the invention [0004] In order to solve the above deficiencies in the prior art, the present application provides an electrochemical device and an electronic device including the above electrochemical device. [0005] According to one aspect of the present application, the present application provides an electrochemical device, including a casing and an electrode assembly accommodated in the casing. The electrode assembl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M10/0525
CPCH01M4/13H01M10/0525H01M2004/021Y02E60/10H01M50/105H01M50/533H01M50/534H01M10/0587H01M50/538H01M4/667H01M4/668
Inventor 王友贵胡旺辉佘权
Owner NINGDE AMPEREX TECH
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