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An electrochemical cathode electrode, an energy storage device comprising the cathode electrode, and a preparation method thereof

A cathode electrode and electrochemical technology, applied in the field of energy storage, can solve the problems of restricting graphene and restricting the diffusion of lithium ions, etc., and achieve the effect of avoiding hindrance and improving the performance of charging and discharging at a large rate

Active Publication Date: 2017-10-17
GUANGDONG ZHUGUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the two-dimensional structure of graphene itself greatly restricts the diffusion of lithium ions in the direction perpendicular to the graphene sheet field, thereby limiting the performance of graphene as a conductive agent for lithium-ion batteries.

Method used

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  • An electrochemical cathode electrode, an energy storage device comprising the cathode electrode, and a preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1, different from Comparative Example 2, this embodiment comprises the following steps:

[0029] Preparation of the cathode electrode sheet: Lithium iron phosphate with a particle size of 1um is selected as the active material, and porous graphene (thickness is 3nm) with a sheet plane equivalent diameter of 100um is used as the conductive agent, and the hole shape of the porous graphene is a circular hole , the diameter of the hole is 0.1um (0.1a), and the hole spacing is 10um (10a); then weigh according to the mass relationship of lithium iron phosphate: polyvinylidene fluoride: graphene = 95:2:3, add nitrogen methyl pyridoxine The cathode slurry is obtained by stirring in loradone, coated on the aluminum current collector, and then the cathode electrode sheet is obtained after cold pressing, slitting, welding, pasting and other processes.

[0030] The rest are the same as those of Comparative Example 2, and will not be repeated here.

Embodiment 2

[0031] Embodiment 2, different from Embodiment 1, this embodiment includes the following steps:

[0032] Preparation of the cathode electrode sheet: select lithium iron phosphate with an average particle size of 1um as the active material, and porous graphene (thickness 3nm) with a sheet plane equivalent diameter of 100um as the conductive agent. The hole shape of the porous graphene is a circle hole, the effective diameter of the hole is 0.1um (0.1a), and the hole spacing is 2um (2a); then weigh according to the mass relationship of lithium iron phosphate: polyvinylidene fluoride: graphene = 95:2:3, add nitrogen form The cathode slurry was obtained by stirring in pyrrolidone, which was coated on the aluminum current collector, and then the cathode sheet was obtained after cold pressing, slitting, welding, pasting and other processes.

[0033] The rest are the same as in Embodiment 1, and will not be repeated here.

Embodiment 3

[0034] Embodiment 3, different from Embodiment 1, this embodiment includes the following steps:

[0035]The preparation of the cathode electrode sheet: select lithium iron phosphate with a particle size of 1um as the active material, and porous graphene (thickness 3nm) with an effective diameter of 100um as the conductive agent. The average diameter is 0.1um (0.1a), and the average hole spacing is 0.4um (0.4a); then weigh according to the mass relationship of lithium iron phosphate: polyvinylidene fluoride: graphene = 95:2:3, add nitrogen form The cathode slurry was obtained by stirring in pyrrolidone, which was coated on the aluminum current collector, and then the cathode sheet was obtained after cold pressing, slitting, welding, pasting and other processes.

[0036] The rest are the same as in Embodiment 1, and will not be repeated here.

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Abstract

The invention belongs to the technical field of energy storage and particularly relates to an electrochemical cathode electrode. A cathode plate comprises a cathode coating and a substrate, wherein the cathode coating comprises a cathode active substance, an adhesive and a conductive agent, wherein the diameter of the cathode active substance is represented by a and the conductive agent at least contains graphene which is porous graphene; the pitch of holes is represented by b which is greater than or equal to 10a. According to the electrochemical cathode for the energy storage apparatus in the structure, the porous graphene is used as the conductive agent, so that the diffusion resistance on ions in a direction vertical to the plane of graphene is relatively small. Therefore, the electrochemical cathode electrode has a relatively excellent electrochemical property.

Description

technical field [0001] The invention belongs to the technical field of energy storage, and in particular relates to an electrochemical cathode electrode, an energy storage device including the cathode electrode and a preparation method thereof. Background technique [0002] Since 1991, carbon materials were creatively used in the field of lithium-ion batteries and brought revolutionary changes in this field - after multiple charge and discharge efficiently and safely, they have been widely used in mobile phones, cameras, notebooks computers and other portable appliances. Compared with traditional lead-acid, Ni-Cd, MH-Ni batteries, lithium-ion batteries have higher specific volume energy density, specific gravimetric energy density, better environmental friendliness, smaller self-discharge and longer battery life. It is an ideal power supply for mobile appliances, power supplies for electric vehicles, and storage appliances for power stations in the 21st century. [0003] H...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/131H01M4/1391H01M4/38
CPCH01M4/13H01M4/131H01M4/136H01M4/625H01M10/0525H01M10/058H01M2004/027H01M2220/30Y02E60/10
Inventor 杨玉洁
Owner GUANGDONG ZHUGUANG NEW ENERGY TECH