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Cylindrical lithium ion battery and manufacturing method thereof

A technology of lithium ion battery and manufacturing method, applied in electrolyte battery manufacturing, battery electrode, secondary battery and other directions, can solve the problems of layered structure collapse, material capacity degradation, etc., to achieve lower internal resistance, higher specific capacity, and improved cycle The effect of capacity retention

Inactive Publication Date: 2014-08-13
MEIZHOU BOFUNENG BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

LiCoO 2 The lithium intercalation potential of the positive electrode material is high, and the theoretical capacity reaches 274mAh / g. However, in the actual cycle process, when more than half of the lithium ions are released, the capacity of the material will be seriously degraded, and its layered structure tends to collapse. Capacity not exceeding 150mAh / g

Method used

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  • Cylindrical lithium ion battery and manufacturing method thereof
  • Cylindrical lithium ion battery and manufacturing method thereof
  • Cylindrical lithium ion battery and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Lithium cobalt oxide (LiCoO 2 ) powder with 0.0121wt% indium oxide, at this moment, the mass fraction of elemental indium in indium-doped lithium cobalt oxide is 0.005%, and 0.05wt% dispersant is used as medium for grinding and mixing with alcohol and agate balls, material: balls : The alcohol ratio is 1: 2: 1.5 (mass ratio), put it into a star-shaped ball mill jar, grind and mix the materials for 30 minutes, put it into a microwave oven and dry it, and then make the indium-doped lithium cobalt oxide positive electrode material. The positive electrode material, acetylene carbon black as the conductive agent, and polyvinylidene fluoride (PVDF) binder were made into a slurry in a ratio of 94:3.5:2.5 by mass percentage, and evenly coated on a 20 μm thick aluminum foil. into a positive plate.

[0032] Mix the negative electrode active material small particle size artificial graphite, acetylene carbon black, and polyvinylidene fluoride (PVDF) binder in a ratio of 94:3.5:2.5...

Embodiment 2

[0034] Lithium cobalt oxide (LiCoO 2) powder with 14.49% indium oxide. At this time, the mass fraction of element indium in indium-doped lithium cobaltate is 6%, and alcohol and agate balls are used as media for grinding and mixing. The ratio of material: ball: alcohol is 1: 2: 1.5 (mass ratio), put it into a star-shaped ball mill jar, grind and mix the materials for 30 minutes, then put it into a microwave oven to dry, and then make an indium-doped lithium cobalt oxide cathode material.

[0035] The steps of preparing positive electrode sheet, negative electrode sheet and battery assembly and molding are the same as in Example 1.

Embodiment 3

[0037] In lithium cobalt oxide (LiCoO 2 ) powder with 0.024% indium oxide, at this time, the mass fraction of element indium in indium-doped lithium cobalt oxide is 0.01%, and alcohol and agate balls are used as media for grinding and mixing, and the ratio of material: ball: alcohol is 1:2: 1.5 (mass ratio), put it into a star-shaped ball mill jar, grind and mix the materials for 30 minutes, then put it into a microwave oven to dry, and then make an indium-doped lithium cobalt oxide cathode material.

[0038] The steps of preparing positive electrode sheet, negative electrode sheet and battery assembly and molding are the same as in Example 1.

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Abstract

The embodiment of the invention provides a cylindrical lithium ion battery which comprises a positive pole piece, a negative pole piece, electrolyte, a membrane and a metal shell, wherein the positive pole piece is prepared from a lithium cobalt oxide (LiCoO2) material, and a certain amount of indium compound is doped into the LiCoO2 material. The indium-doped lithium cobalt oxide contains 0.005-6 percent of the indium element by mass. After the lithium cobalt oxide material is doped with the indium element, the conductivity of the lithium cobalt oxide (LiCoO2) material is improved, so that the inner resistance is reduced, and the capacity is increased; compared with the electric capacity of the conventional cylindrical lithium ion battery, the electric capacity of the cylindrical lithium ion battery disclosed by the invention can be increased by 10-20 percent, and the safety of the battery is greatly improved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a cylindrical lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries have become one of the most widely used secondary batteries due to their advantages such as high energy density, good cycle performance, high operating voltage, and no memory effect. Lithium batteries are composed of five main components: positive electrode material, negative electrode material, separator, electrolyte, and auxiliary components. The positive electrode generally chooses a lithium intercalation compound with a potential greater than 3V relative to lithium and is stable in air, such as LiCoO 2 , LiNiO 2 , LiMnO 2 etc.; the negative electrode material should choose the intercalable lithium compound whose potential is as close as possible to the lithium potential, such as lithium-carbon intercalation compound LixC 6 ; The electrolyte is mostly L...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M10/058
CPCY02E60/122H01M4/525H01M4/626H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 管耀新苏伟良丁文杰袁涛
Owner MEIZHOU BOFUNENG BATTERY
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