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Lithium-ion power battery and preparation method thereof

A power battery, lithium ion technology, applied in the field of lithium ion power battery and its preparation, can solve the problems of poor safety of ternary lithium battery, low battery energy density, etc., and achieve improved safety, long service life and large battery capacity. Effect

Inactive Publication Date: 2016-08-10
TIANJIN SINOPOLY NEW ENERGY TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to overcome the defects of poor safety and relatively low energy density of the ternary lithium battery existing in the prior art, and provide a lithium-ion power battery and its preparation method

Method used

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  • Lithium-ion power battery and preparation method thereof
  • Lithium-ion power battery and preparation method thereof
  • Lithium-ion power battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The preparation method of the lithium-ion power battery of high energy density in the present embodiment comprises the following steps:

[0049] (1) Raw material pretreatment

[0050] The positive electrode active material LiNi 0.8 co 0.15 Al 0.05 o 2 (NCA), conductive agent 1 (Supper-P), conductive agent 2 (KS-6), binder (PVDF) and auxiliary agent (oxalic acid) were dried under vacuum at 120°C for 4h.

[0051] (2) Raw material mixing

[0052] Add the dried PVDF into nitrogen-methylpyrrolidone and fully dissolve it at 25°C. In an environment with a relative humidity of 20%, add the positive electrode active material (93.0wt%), conductive agent 1 (2.5wt%), conductive agent 2 (1.0wt%) and auxiliary agent (0.5wt%) into the above-mentioned dissolved PVDF (3.0wt%) nitrogen-methylpyrrolidone, stirred for 6 h, and nitrogen protection was used during the stirring process.

[0053] (3) Electrode coating and drying

[0054] Pour out the above slurry and sieve it through a...

Embodiment 2

[0063] A high-energy-density lithium-ion power battery includes a battery cell, an electrolyte, and an aluminum-plastic case, wherein the battery cell is completed by stacking a positive pole piece, a negative pole piece, and a diaphragm. The preparation method of the lithium-ion power battery of high energy density in the present embodiment comprises the following steps:

[0064] (1) Raw material pretreatment

[0065] The positive electrode active material LiNi 0.8 co 0.15 Al 0.05 o 2 (NCA), conductive agent 1 (Supper-P), conductive agent 2 (graphite carbon), binder (PVDF) and auxiliary agent (oxalic acid) were dried under vacuum at 120 °C for 6 h.

[0066] (2) Raw material mixing

[0067] Add the dried PVDF into nitrogen-methylpyrrolidone and fully dissolve it at 25°C. In an environment with a relative humidity of 20%, add the positive electrode active material (94.0wt%), conductive agent 1 (1.5wt%), conductive agent 2 (0.5wt%) and auxiliary agent (0.8wt%) into the abo...

Embodiment 3

[0078] A high-energy-density lithium-ion power battery includes a battery cell, an electrolyte, and an aluminum-plastic case, wherein the battery cell is completed by stacking a positive pole piece, a negative pole piece, and a diaphragm. The preparation method of the lithium-ion power battery of high energy density in the present embodiment comprises the following steps:

[0079] (1) Raw material pretreatment

[0080] The positive electrode active material LiNi 0.8 co 0.15 Al 0.05 o 2 (NCA), conductive agent 1 (Supper-P), conductive agent 2 (graphite carbon), binder (PVDF) and auxiliary agent (maleic acid) were dried under vacuum at 120 °C for 4 h.

[0081] (2) Raw material mixing

[0082] Add the dried PVDF into nitrogen-methylpyrrolidone and fully dissolve it at 25°C. In an environment with a relative humidity of 20%, add the positive electrode active material (92.0wt%), conductive agent 1 (3.5wt%), conductive agent 2 (0.5wt%) and auxiliary agent (0.8wt%) into the abo...

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Abstract

The invention discloses a lithium-ion power battery and a preparation method thereof. The lithium-ion power battery cell is prepared from a positive electrode plate, a negative electrode plate and sheet and a diaphragm by a lamination way, and the sizing raw material of the positive electrode plate comprises a positive electrode active material and an adjuvant; the sizing material is protected by an inert gas in the synthesis process, and the positive electrode active material is LiNiXCoYM1-X-YO2, wherein 0.6<=X is less than or equal to 1.0 and more than or equal to 0.6, Y is less than or equal to 0.4 and more than or equal to 0, M is one or more of Mn, Mg, Al, and Cr, and the adjuvant is an organic acid with a molecular weight of less than or equal to 500; the diaphragm is a ceramic diaphragm, and at least one group of copper foil and aluminum foil is additionally arranged at the two sides of the cell. The lithium-ion power battery has the advantages of very good safety performance and energy density of up to 220Wh / Kg.

Description

technical field [0001] The invention relates to the field of battery manufacturing, in particular to a lithium-ion power battery and a preparation method thereof. Background technique [0002] With the development of society and the advancement of science and technology, lithium-ion batteries have been widely used as a new generation of energy systems. Lithium-ion batteries are used as power sources. Compared with traditional oil-based power sources, they have the advantages of high safety and no pollution, which makes lithium batteries have great application prospects in vehicle power supplies. At present, pure electric vehicles have been successfully produced at home and abroad and have been widely used. Sale. [0003] At present, the new energy vehicle industry has become inevitable and historic. As the "heart" of new energy vehicles - lithium-ion power batteries will become the core technology field of the new energy industry. my country's automobile lithium-ion power ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/505H01M10/058H01M10/0585H01M10/0525H01M4/62
CPCH01M4/505H01M4/525H01M4/62H01M4/622H01M4/623H01M4/625H01M10/0525H01M10/058H01M10/0585Y02E60/10Y02P70/50
Inventor 李山河叶茂郑春满谢凯
Owner TIANJIN SINOPOLY NEW ENERGY TECH
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