Preparation method of lithium ion battery and lithium ion battery

A lithium-ion battery and pretreatment technology, which is applied in battery electrodes, electrolyte storage battery manufacturing, electrode manufacturing, etc., can solve problems such as energy density and safety performance defects, affect battery electrochemical performance, and poor high-temperature performance, and achieve excellent overall performance , high energy density and safety, and the effect of improving surface properties

Active Publication Date: 2018-05-15
福建荣华科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, although the lithium iron phosphate / graphite system battery has good safety, its energy density is only about 120Wh / kg; although the lithium manganese oxide / graphite system battery has good safety, it has low energy density and poor high-temperature performance; Although lithium cobalt manganese oxide / graphite system battery has high energy density, its safety is poor
Positive and negative electrode materials often have poor bonding force in the process of bonding with the current collector, which seriously affects the electrochemical performance of the battery.
[0004] The current lithium-ion batteries still have defects in energy density and safety performance, how to obtain lithium-ion batteries with high energy density and high safety has become an urgent problem to be solved

Method used

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  • Preparation method of lithium ion battery and lithium ion battery
  • Preparation method of lithium ion battery and lithium ion battery

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preparation example Construction

[0039] According to one aspect of the present invention, a kind of preparation method of lithium-ion battery is provided, comprising the following steps:

[0040] (a) Pretreatment of the positive electrode current collector: first wipe the surface of the aluminum foil with oxalic acid solution, and then immediately wipe the surface of the aluminum foil with potassium permanganate solution when the oxalic acid solution is not dry, and obtain the pretreated positive electrode current collector after drying;

[0041] (b) Negative electrode current collector pretreatment: wipe the copper foil surface with citric acid solution, and obtain the pretreated negative electrode current collector after drying;

[0042] (c) Preparation of the positive electrode sheet: first coat the graphene-cyclodextrin cross-linked polymer slurry on the pretreated positive electrode current collector, and form a 1-4 μm thick graphene-cyclodextrin cross-linked polymer after drying layer; graphene-cyclodex...

Embodiment 1

[0134] A preparation method for a lithium ion battery, comprising the following steps:

[0135] (1) Pretreatment of the positive electrode current collector: first wipe the surface of the aluminum foil with an oxalic acid solution with a concentration of 0.1% by mass percentage, and then immediately wipe the surface of the aluminum foil with a potassium permanganate solution with a concentration of 0.5% by mass percentage when the oxalic acid solution is not dry, and obtain The pretreated cathode current collector;

[0136] (2) Negative electrode current collector pretreatment: wipe the surface of the copper foil with a citric acid solution with a concentration of 0.8% by mass, and obtain a pretreated negative electrode current collector after drying;

[0137] (3) Preparation of graphene-cyclodextrin crosslinked polymer slurry: dissolving or dispersing 50wt% graphene and 50%wt cyclodextrin crosslinked polymer in water to make a slurry with a viscosity of 400mPa·s material;

...

Embodiment 2

[0144] A preparation method for a lithium ion battery, comprising the following steps:

[0145] (1) Pretreatment of the positive current collector: first wipe the surface of the aluminum foil with an oxalic acid solution with a concentration of 0.5% by mass percentage, and then immediately wipe the surface of the aluminum foil with a potassium permanganate solution with a concentration of 1% by mass percentage when the oxalic acid solution is not dry, and obtain The pretreated cathode current collector;

[0146] (2) Negative electrode current collector pretreatment: wipe the surface of the copper foil with a citric acid solution with a concentration of 0.6% by mass, and obtain a pretreated negative electrode current collector after drying;

[0147] (3) Preparation of graphene-cyclodextrin crosslinked polymer slurry: 40wt% graphene and 60%wt cyclodextrin crosslinked polymer are dissolved or dispersed in water to make a slurry with a viscosity of 500mPa·s material;

[0148] (4...

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Abstract

The invention discloses a preparation method of a lithium ion battery and the lithium ion battery and relates to the technical filed of lithium ion batteries. The preparation method of the lithium ionbattery comprises the following steps: pre-treatment of positive and negative current collectors, preparation of positive and negative pole pieces and assembly of batteries; the positive and negativecurrent collectors are wiped with an oxalic acid solution firstly and are then wiped with a potassium permanganate solution; the positive pole piece is coated with graphene-cyclodextrin cross-linkedpolymer slurry firstly and is then coated with positive material slurry, the coating surface density is 75-85 mg/cm<2>, and a positive active material occupies 98-99 percent of a positive material andcomprises 10-30 percent of lithium cobaltate, 10-30 percent of lithium nickelate, 50-70 percent of LiMnxFe(1-x)PO4 (x is more than 0.5 but less than 1). The preparation method of the lithium ion battery and the lithium ion battery, disclosed by the invention, have the benefits that the problem that the current battery energy density and the safety cannot be considered is solved; the lithium ion battery obtained by the preparation method disclosed by the invention not only is high in energy density, but also is good in safety.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a preparation method of a lithium-ion battery and the lithium-ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high specific energy, high working voltage, and long cycle life, and have been developed rapidly since their commercialization. With the application of lithium-ion batteries in hybrid electric vehicles and electric vehicles, the demand for lithium-ion batteries with high energy density (the ratio of battery energy and battery weight / volume) is increasing. [0003] The energy density of lithium-ion batteries is closely related to the selection of positive and negative active materials and the entire preparation process. The existing active materials for lithium-ion battery positive materials include lithium iron phosphate, lithium manganese oxide, and nickel-cobalt lithium manganese oxide. Among them, although the lith...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/36H01M4/525H01M4/58H01M4/62H01M10/0525H01M10/058
CPCH01M4/04H01M4/362H01M4/525H01M4/5825H01M4/622H01M4/625H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 程建聪许家春杨宏
Owner 福建荣华科技有限公司
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