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Formula and application of double-ion battery positive electrode

A battery positive electrode and dual-ion technology, which is applied to battery electrodes, non-aqueous electrolyte batteries, circuits, etc., can solve problems such as broken tape adhesion, pole piece curling, and low capacity, so as to improve adhesion and solve volume problems. edge effect

Active Publication Date: 2021-08-06
REAL POWER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the embodiment of the present invention is that the surface density of the positive electrode coating of the existing dual-ion battery is low, the capacity is low, and the pole piece is curled and cracked during the coating process. , broken tape and poor adhesion

Method used

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  • Formula and application of double-ion battery positive electrode
  • Formula and application of double-ion battery positive electrode
  • Formula and application of double-ion battery positive electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Dual-ion battery positive electrode formula: 92% active material (graphite), 1% carbon nanotube conductive agent (including solid carbon nanotube CNT, ACNT), 2.5% conductive carbon (Super-P), 1.0% binder (LA133) , 1% binder (LA136D), 1% softener (EC and PC) and 1.5% softener (NMP).

[0039] When preparing the slurry, an additional 0.5% of a dispersant is added, and the dispersant may specifically be a water-based conductive carbon black dispersant.

[0040] A method for preparing a positive electrode of a dual-ion battery, comprising the steps of:

[0041] S1, the slurry was prepared from the dual-ion battery cathode formulation and deionized water.

[0042] Specifically, pre-mix deionized water and binders (LA133 and LA136D) to prepare glue; carbon nanotube conductive agent, conductive carbon, softener (EC and PC), softener (NMP) and dispersion The agent is pre-mixed to obtain a solution; the glue, solution and remaining materials are uniformly mixed to obtain a slur...

Embodiment 2

[0052] Dual-ion battery positive electrode formula: 89% active material (graphite), 1% carbon nanotube conductive agent (including solid carbon nanotube CNT, ACNT), 2.5% conductive carbon (Super-P), 2.0% binder (LA133) , 2% binder (LA136D), 2% softener (EC and PC), 3% softener (NMP).

[0053] When preparing the dressing, an additional 0.5% of a dispersant is added, and the dispersant may specifically be a water-based conductive carbon black dispersant.

[0054] For the preparation method of the positive electrode of the dual-ion battery, refer to Example 1, which will not be repeated here.

[0055] The comparison results of the areal density and capacity of the dual-ion battery positive electrode prepared by the above method are as follows

[0056] Table 2:

[0057]

[0058]

[0059] Table 2 Embodiment 2 and the capacity and surface density comparison table of comparative example

[0060] see Figure 3-4 , image 3 Electron micrograph of the positive electrode of the ...

Embodiment 3

[0063] Dual-ion battery positive electrode formula: 88.5% active material (graphite), 1% carbon nanotube conductive agent (including solid carbon nanotube CNT, ACNT), 2.5% conductive carbon (Super-P), 2.0% binder (LA133) , 2% binder (LA136D), 2% softener (EC and PC), 2% softener (NMP).

[0064] When preparing the dressing, an additional 0.5% of a dispersant is added, and the dispersant may specifically be a water-based conductive carbon black dispersant.

[0065] For the preparation method of the positive electrode of the dual-ion battery, refer to Example 1, which will not be repeated here.

[0066] The comparison results of the areal density and capacity of the dual-ion battery positive electrode prepared by the above method are as follows

[0067] table 3:

[0068]

[0069] Table 3 Example 3 and the capacity and areal density comparison table of comparative examples

[0070] see Figure 5-7 , Figure 5 , Figure 7 Electron micrograph of the positive electrode of th...

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Abstract

The embodiment of the invention discloses a formula and an application of a double-ion battery positive electrode, and relates to the technical field of double-ion batteries. The formula comprises, by weight, 87-95% of an active substance, 0.1-1% of a carbon nanotube conductive agent, 1-5% of conductive carbon, 2-6% of a binder and 1-7% of a softening agent. According to the technical scheme of the embodiment of the invention, the single-sided surface density of the positive electrode of the dual-ion battery can be increased to 15-30 mg / cm<2> from 9 mg / cm<2> in the prior art; the design capacity of a single battery is improved by 53%; and meanwhile, the problems of edge curling, cracks, belt breakage and the like in the coating process of the high-surface-density graphite positive electrode are solved, and the bonding strength is obviously improved.

Description

technical field [0001] The invention relates to the technical field of dual-ion batteries, in particular to a dual-ion battery cathode formula and application. Background technique [0002] The existing dual-ion battery positive electrode formula usually includes active material (graphite), conductive carbon black (Super-P), conductive graphite (KS-6), binder (CMC-SBR) and solvent. The graphite material used in the positive electrode usually has an intercalation voltage of 4.5V vs. Li + / Li or above is an emerging high-voltage, low-cost energy storage system. However, the anion intercalation gram capacity of graphite cathode is only 1 / 3 of its lithium ion intercalation capacity. Affected by this, the graphite positive electrode of the dual-ion battery puts forward strict requirements on parameters such as the coating surface density and the bonding strength of the binder. The water-based binder of the existing CMC-SBR system can It is prone to cracks and curling, and it i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M4/62H01M4/133H01M4/1393H01M10/05B82Y30/00B82Y40/00
CPCH01M4/587H01M4/625H01M4/621H01M4/1393H01M4/133H01M10/05B82Y30/00B82Y40/00Y02E60/10
Inventor 唐永炳潘强韩晓琪
Owner REAL POWER IND LTD
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