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Preparation method of lithium ion battery

A lithium-ion battery and lithium-rich technology, applied in the field of lithium-ion batteries, can solve the problems of poor structural consistency, uncontrollability, and poor cell cycle performance.

Active Publication Date: 2017-02-01
GUANGDONG ZHUGUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the above-mentioned methods of improving the first-time efficiency of the battery through lithium-rich means, and then increasing the battery capacity, in the battery preparation process, after the liquid injection, with the infiltration of the electrolyte, ion channels and electrons are formed between the lithium-rich material and the lithium-rich electrode. When channeling, a solid electrolyte film (SEI film) will be spontaneously formed on the surface of the lithium-rich material particles. The film formation process of the SEI film is an uncontrollable process, and the formed SEI film has poor composition and structure consistency. Poor cycle performance

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  • Preparation method of lithium ion battery

Examples

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Embodiment 1

[0032] Embodiment 1, different from Comparative Example 1, this embodiment comprises the following steps:

[0033] Preparation of lithium-rich electrode: same as Comparative Example 1.

[0034]Bare cell preparation: choose lithium cobaltate as the cathode active material, stir with conductive agent, binder and nitrogen methylpyrrolidone to obtain a slurry, and then apply it on the aluminum fluid, cold press, slitting, and then use The corona equipment treats the surface of the coating to make the surface of the electrode more conducive to the infiltration of the electrolyte, and then welds, glues, and dries it for use; the separator is treated with ceramic coating to make the surface of the separator more conducive to the electrolyte. Infiltration; and then wind the lithium-rich anode sheet, cathode sheet and the above separator to obtain a bare cell.

[0035] Liquid injection and standing: choose aluminum-plastic film as the packaging material for top-side sealing, and then ...

Embodiment 2

[0039] Embodiment 2, different from Embodiment 1, this embodiment includes the following steps:

[0040] Preparation of lithium-rich electrode: select silicon-carbon composite as the anode active material, stir it with conductive agent, adhesive and deionized water to obtain a slurry, and then coat it on the copper current collector, cold press, slitting, welding, Dry after sticking glue; select porous metal lithium strip as lithium-rich source (equivalent pore diameter, that is, the equivalent diameter d of a single lithium-free region is 0.2cm, and the distance between two holes is the width of the lithium-containing region between the two lithium-free regions a 1cm), using a surface pressure of 50MPa, the metal lithium strips are composited on both sides of the electrode to obtain a lithium-rich electrode sheet.

[0041] Bare cell preparation: choose lithium cobaltate as the cathode active material, stir with conductive agent, binder and nitrogen methylpyrrolidone to obtain...

Embodiment 3

[0046] Example 3, preparation of lithium-rich electrode: select silicon-carbon composite as the anode active material, stir with conductive agent, adhesive and deionized water to obtain slurry, and then apply it on copper current collector, cold press, separate strip, welding, and pasting glue; select the porous metal lithium strip as the lithium-rich source (the equivalent hole diameter is the equivalent diameter d of a single lithium-free region is 4cm, the distance between the two holes is the lithium-containing area between the two lithium-free regions The region width a is 4cm), using a surface pressure of 0.5MPa, the metal lithium strip is composited on both sides of the electrode to obtain a lithium-rich electrode sheet.

[0047] Bare cell preparation: choose lithium cobaltate as the cathode active material, stir with conductive agent, binder and nitrogen methylpyrrolidone to obtain a slurry, and then apply it on the aluminum fluid, cold press, slitting, and then use Th...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of lithium ion batteries: the method mainly includes preparation of electrodes, preparation of bare cells that are easy to infiltrate with electrolyte, liquid injection and infiltration, formation of solid electrolyte membrane (SEI membrane) film, finished cell preparation and other steps. Using this method to prepare lithium-ion batteries can achieve rapid infiltration of the electrolyte, and the infiltration can limit the occurrence of film-forming reactions to the greatest extent, so that after the entire battery cell is infiltrated, the electrolyte on the electrode has better composition consistency, thereby It makes the SEI film formed in each area of ​​the cell electrode have good consistency.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a preparation method of lithium ion batteries. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high voltage, low self-discharge and light weight, so they are widely used in various portable mobile electronic devices such as notebook computers, digital cameras, mobile phones, and MP3 players. With the miniaturization and multi-function development of portable mobile electronic devices, people have higher and higher requirements on the energy density of lithium-ion secondary batteries. Since the lithium-ion battery needs to form a solid electrolyte (SEI) film during the formation process, it consumes the Li provided by the cathode. + , which brings the capacity loss of the battery and affects the improvement of energy density. For the graphite system, the first conversion will bring about 10% energy loss; for some high...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058
CPCH01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 杨玉洁
Owner GUANGDONG ZHUGUANG NEW ENERGY TECH
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