Lithium supplement paste for lithium secondary battery and preparation method of lithium secondary battery

A lithium secondary battery and lithium replenishment technology, which is applied in the manufacture of secondary batteries, battery electrodes, electrolyte batteries, etc., can solve the problems affecting the increase of energy density of lithium ion batteries, the reduction of active material ratio, and the lack of activity, so as to reduce irreversible Capacity loss, reduced loss, low cost effect

Inactive Publication Date: 2020-02-07
MICROVAST POWER SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process of supplementing lithium to the positive electrode may lead to a decrease in the proportion of active materials in the positive electrode, and these products after lithium supplementation are inactive, thus affecting the further improvement of the energy density of lithium-ion batteries

Method used

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  • Lithium supplement paste for lithium secondary battery and preparation method of lithium secondary battery
  • Lithium supplement paste for lithium secondary battery and preparation method of lithium secondary battery
  • Lithium supplement paste for lithium secondary battery and preparation method of lithium secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] (1) Disperse nickel-cobalt lithium manganate (NCM523), conductive agent Super P (conductive carbon black, SP) and polyvinylidene fluoride (binder PVDF) in N-methylpyrrolidone at a mass ratio of 93:4:3 (NMP), forming a positive electrode active material slurry. The positive electrode active material slurry was coated on the surface of aluminum foil (conductive substrate), then dried in an oven at 100°C for 3 hours, and rolled to obtain a positive electrode sheet coated with a positive electrode active material layer (thickness: 50 μm).

[0052] (2) Disperse Li3N, conductive carbon fiber (VGCF), and binder polymethyl methacrylate (PMMA) in the organic solvent N-methylpyrrolidone (NMP) at a mass ratio of 49:49:2 to form a lithium supplement slurry. The lithium-replenishing slurry was coated on the surface of the positive electrode sheet obtained in step (1), and then dried in an oven at 100° C. for 3 hours to finally form a lithium-replenishing positive electrode sheet wi...

Embodiment 2

[0056] (1) Disperse nickel-cobalt lithium manganate (NCM523), conductive agent Super P (conductive carbon black, SP) and polyvinylidene fluoride (binder PVDF) in N-methylpyrrolidone at a mass ratio of 93:4:3 (NMP), forming a positive electrode active material slurry. The positive electrode active material slurry was coated on the surface of aluminum foil (conductive substrate), then dried in an oven at 100° C. for 3 h, and rolled to obtain a pole piece coated with a positive electrode active material layer (thickness 450 μm).

[0057] (2) will Li 3 N. The conductive agent (VGCF) and the binder polymethyl methacrylate (PMMA) are dispersed in the organic solvent N-methylpyrrolidone (NMP) at a mass ratio of 90:5:5 to form a lithium-supplementing slurry. The lithium-replenishing slurry was coated on the surface of the positive electrode sheet obtained in step (1), and then dried in an oven at 100° C. for 3 hours to finally form a lithium-replenishing positive electrode sheet with...

Embodiment 3

[0061] (1) Disperse nickel-cobalt lithium manganate (NCM523), conductive agent Super P (conductive carbon black, SP) and polyvinylidene fluoride (binder PVDF) in N-methylpyrrolidone at a mass ratio of 93:4:3 (NMP), forming a positive electrode active material slurry. The positive electrode active material slurry was coated on the surface of aluminum foil (conductive substrate), then dried in an oven at 100° C. for 3 h, and rolled to form a pole sheet coated with a positive electrode active material layer (thickness 200 μm).

[0062] (2) will Li 3 N. The conductive agent (VGCF) and the binder polymethyl methacrylate (PMMA) are dispersed in the organic solvent N-methylpyrrolidone (NMP) at a mass ratio of 49:46:5 to form a lithium-supplementing slurry. The lithium-replenishing slurry was coated on the surface of the positive electrode sheet obtained in step (1), and then dried in an oven at 100° C. for 3 hours to finally form a lithium-replenishing positive electrode sheet with ...

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Abstract

The invention provides lithium supplement paste for a lithium secondary battery. The lithium supplement paste comprises a lithium-containing compound, a conductive agent, a bonding agent and an organic solvent, wherein the bonding agent is a bonding agent which can be dissolved in a non-aqueous electrolyte solution. In the obtained lithium secondary battery, the cycle property of the battery is enabled not to be changed, and the energy density of the lithium secondary battery is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, in particular to a method for replenishing lithium to a positive pole piece or a diaphragm of a lithium-ion battery. Background technique [0002] Lithium secondary batteries using non-aqueous electrolytes have the advantages of high specific energy and low environmental pollution. Since Japan's Sony Corporation first launched commercial lithium secondary batteries in 1990, lithium secondary batteries have been widely used in electronic consumer products such as mobile phones, portable computers, and video cameras. With the continuous development of electronic product technologies such as smartphones and notebook computers, the energy density requirements for lithium secondary batteries are getting higher and higher. [0003] During the first charging and discharging process of non-aqueous electrolyte lithium secondary battery, due to the formation of solid electrolyte (SEI) film, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/58H01M4/62H01M10/0525H01M10/058
CPCH01M4/362H01M4/485H01M4/58H01M4/5815H01M4/582H01M4/5825H01M4/622H01M10/0525H01M10/058H01M2220/20Y02E60/10Y02P70/50
Inventor 魏冠杰史哲忠布莱恩·托马斯·米本
Owner MICROVAST POWER SYST CO LTD
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