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Lithium ion power battery and preparation method thereof

A power battery and lithium-ion technology, which is applied in the field of lithium-ion power batteries, can solve problems such as complex processes, large environmental pollution, and affecting adhesive bonding performance, and achieve the effects of simple production methods, good safety performance, and low cost

Inactive Publication Date: 2014-04-23
ZHUHAI LIYUAN NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] When making electrode slurry, the commonly used binder is PVDF, and the commonly used solvent is NMP. However, the problem with using NMP is that it is highly polluting to the environment, and NMP is a flammable and explosive item. In the process of making electrode slurry, It is necessary to pay attention to the removal of NMP in a timely manner. In addition, because NMP can absorb water, which will affect the adhesive performance of the adhesive. Therefore, in the process of making electrodes, the moisture content of NMP must be controlled, so the process will become complicated.

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

[0027] The formula composition of a kind of lithium-ion power battery negative pole piece material is as follows table 1:

[0028]

[0029] The formula composition of a kind of lithium-ion power battery cathode sheet material is as follows table 2:

[0030]

[0031] Diaphragm: PP single-layer diaphragm

[0032] Electrolyte: 1.2mol / L LiPF 6 Solution, the solvent composition is EC:DMC:EMC=1:1:1

[0033] The shell is a plastic shell

[0034] The specific preparation method is as follows:

[0035] 1) Production of positive electrode sheet: add positive electrode material according to the formula, add water to dissolve, stir evenly with double star power mixer at high speed, eliminate air bubbles and iron filings, and obtain positive electrode slurry, pass positive electrode slurry through automatic feeding system and coating machine Evenly coated on aluminum foil, baked at 80°C for 12 hours in a vacuum environment, rolled and cut into positive electrode sheets;

[0036]...

Embodiment 2

[0040] The formula composition of a kind of lithium-ion power battery negative pole piece material is as follows table 3:

[0041]

[0042] The formula composition of a kind of lithium-ion power battery cathode sheet material is as follows table 4:

[0043]

[0044] Diaphragm: PP single-layer diaphragm

[0045] Electrolyte: 1.2mol / L LiPF 6 Solution, the solvent composition is EC:DMC:EMC=1:1:1

[0046] The shell is a plastic shell

[0047] The specific preparation method is as follows:

[0048] 1) Production of positive electrode sheet: add positive electrode material according to the formula, add water to dissolve, stir evenly with double star power mixer at high speed, eliminate air bubbles and iron filings, and obtain positive electrode slurry, pass positive electrode slurry through automatic feeding system and coating machine Evenly coated on aluminum foil, baked at 100°C for 10 hours in a vacuum environment, rolled, cut into positive electrode sheets;

[0049] 2) ...

Embodiment 3

[0053] The formula composition of a kind of lithium-ion power battery negative pole piece material is as follows table 5:

[0054]

[0055] The formula composition of a kind of positive pole plate material of lithium-ion power battery is as follows table 6:

[0056]

[0057] Diaphragm: PP single-layer diaphragm

[0058] Electrolyte: 1.2mol / L LiPF 6 Solution, the solvent composition is EC:DMC:EMC=1:1:1

[0059] The shell is a plastic shell

[0060] The specific preparation method is as follows:

[0061] 1) Production of positive electrode sheet: add positive electrode material according to the formula, add water to dissolve, stir evenly with double star power mixer at high speed, eliminate air bubbles and iron filings, and obtain positive electrode slurry, pass positive electrode slurry through automatic feeding system and coating machine Evenly coated on aluminum foil, baked at 120°C for 5 hours in a vacuum environment, rolled, cut into positive electrode sheets;

...

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Abstract

The invention discloses a lithium ion power battery and a preparation method thereof. According to the invention, the cathode pole piece of the lithium ion power battery comprises, on a mass percentage basis, 83 to 94% of lithium titanate, 2 to 10% of an adhesive and 3 to 10% of a conductive agent; the cathode material of the lithium ion power battery comprises, on a mass percentage basis, 85 to 96% of lithium manganate, 1 to 10% of an adhesive and 3 to 11% of a conductive agent. The lithium ion power battery provided in the invention has the advantages of low cost, great capacity, a long cycle life and good safety performance, and is applicable to a plurality of fields like hybrid electric vehicles and military articles with high performance requirements; the preparation method provided in the invention is simple; since no n-methylpyrrolidone (NMP) is used in the process of preparing electrodes and water is used as a solvent, no pollution is produced, dangerous accidents like blast or burning do not happen, zero discharge of pollution is realized, and complexity of a preparing process for lithium ion power batteries is lowered down as well.

Description

technical field [0001] The invention relates to a lithium ion power battery and a preparation method of the lithium ion power battery. Background technique [0002] The world's energy and environmental protection situation is becoming increasingly tense, and batteries are increasingly favored by people as a new energy source. Due to its high energy density, light volume, small weight, environmental protection and pollution-free, lithium-ion batteries have become the main direction of new energy development. With the rapid development of electric vehicles, space technology, national defense industry, and power storage systems, higher requirements are put forward for the specific capacity, cycle life, and safety of secondary batteries, and the electrochemical performance of batteries is improved. It can start with electrode materials and other aspects. [0003] Traditional lithium-ion batteries all use graphite as the main active material of the negative electrode material. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M4/62H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 李宝玉王保刘兴福
Owner ZHUHAI LIYUAN NEW ENERGY TECH
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