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High density lithium ion battery cathode material lithium cobalt oxide and preparation method thereof

A lithium-ion battery, cathode material technology, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve problems such as the inability to balance weight energy density and volume energy density, particle size reduction, and battery safety hazards. Provides the effect of space utilization, volumetric energy density improvement, improved cycle performance and safety performance

Inactive Publication Date: 2012-05-09
JIANGSU KING LITHIUM CELL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is a problem that gravimetric energy density and volumetric energy density cannot be balanced
Furthermore, the reduction of particle size will also bring hidden dangers to the safety of batteries.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A lithium ion secondary battery cathode material doped, coated lithium cobalt oxide, its chemical formula is:

[0027] Li 1+x co （1-a-b-c） Mg a Ti b Al c f d o （2-d） , wherein, 0≤a≤0.03, 0.001≤b≤0.02, 0≤c≤0.01, 0≤d≤0.02, 0≤x≤0.08; having a layered structure.

[0028] The preparation method of the above-mentioned lithium-ion secondary battery positive electrode material magnesium-doped lithium cobaltate is as follows: mainly comprising the following steps:

[0029] (1) Preparation of large-grained lithium cobaltate: Mix the cobalt source, lithium source, and magnesium source by ball milling according to the atomic ratio of lithium, cobalt, and magnesium in the ratio of 1.06:1.00:0.005, and use polyurethane balls for ball milling. The ball milling time is 5 hours. The cobalt source used can be cobalt carbonate, cobalt oxide, etc., and the lithium source can be lithium hydroxide, lithium carbonate, etc.;

[0030](2) Preparation of small particles of lithium cobalta...

Embodiment 2

[0037] (1) Preparation of large-grained lithium cobaltate: Mix the cobalt source, lithium source, and aluminum source by ball milling according to the atomic ratio of lithium, cobalt, and aluminum in the ratio of 1.06:1.00:0.005, and use polyurethane balls for ball milling. The ball milling time is 5 hours. The cobalt source used can be cobalt carbonate, cobalt oxide, etc., and the lithium source can be lithium hydroxide, lithium carbonate, etc.;

[0038] (2) Preparation of small particles of lithium cobaltate: mix the cobalt source, lithium source, and aluminum source by ball milling according to the atomic ratio of lithium, cobalt, and aluminum in the ratio of 1.005:1.00:0.005, and use polyurethane balls for ball milling. The ball milling time is 5 hours. The cobalt source used can be cobalt carbonate, cobalt oxide, etc., and the lithium source can be lithium hydroxide, lithium carbonate, etc.;

[0039] (3) Put the mixed raw materials in a roasting furnace, and roast in an a...

Embodiment 3

[0045] (1) Preparation of large-grained lithium cobaltate: mix the lithium source and the cobalt source by ball milling for 5 hours according to the ratio of lithium and cobalt of 1.08:1.00; the cobalt source used can be cobalt carbonate, cobalt oxide, etc., and the lithium source can be Lithium hydroxide, lithium carbonate, etc.; put the mixed raw materials in a roasting furnace, and roast in an air or oxygen atmosphere, the roasting temperature is 995 ° C, and the roasting time is 15 hours;

[0046] (2) Preparation of medium-sized lithium cobalt oxide: According to the ratio of lithium and cobalt of 1.03:1.00, the lithium source and the cobalt source are ball milled for 5 hours; the cobalt source used can be cobalt carbonate, cobalt oxide, etc., and the lithium source can be Lithium hydroxide, lithium carbonate, etc.; the mixed raw materials are placed in a roasting furnace, and roasted in an atmosphere of air or oxygen. The roasting temperature is 985 ° C, and the roasting t...

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Abstract

The invention relates to a manufacture technology of a lithium ion battery cathode material and specifically provides a high density lithium ion battery cathode material lithium cobalt oxide and a preparation method thereof. The high density lithium ion battery cathode material lithium cobalt oxide of the invention has a chemical formula of Li1+xCo(1-a-b-c) MgaTibAlcFdO(2-d), wherein a, b, c, d and x satisfy relations of: 0<=a<=0.03, 0.001<=b<=0.02, 0<=c<=0.01, 0<=d<=0.02 and 0<=x<=0.08; and a preferable value of a, a preferable value of b, a preferable value of c and a preferable value of d satisfy relations of: 0.005<=a<=0.01, 0.002<=b<=0.01, 0<=c<=0.005 and 0<=d<=0.005; and a cation M is doped or cladded by one or a composition of several selected from magnesium, titanium and aluminium. The invention can enhance stability of material structure, cycle performance and safety performance of the lithium ion battery as well as effectively increase space utilization rate of the material and compacted density of the cathode material, thereby substantially raising volume energy density of the material.

Description

technical field [0001] The invention relates to a manufacturing technology of a positive electrode material of a lithium ion battery, in particular to lithium cobalt oxide, a high density lithium ion battery positive electrode material, and a preparation method thereof. Background technique [0002] Lithium-ion battery, as a new type of secondary battery, has the characteristics of high specific capacity, high voltage, and good safety. It is widely used in the driving power of portable electrical appliances such as mobile phones, notebook computers, camcorders, DVD, and MP3. However, with the continuous upgrading of electronic products, the requirements for their power sources are also increasing. The market requires the energy density of battery materials to increase at a rate of 5% per year. [0003] Specifically, the energy density of lithium-ion batteries can be divided into volumetric energy density and gravimetric energy density. What the market needs is to increase th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525C01G51/00
CPCY02E60/122Y02E60/10
Inventor 崔立峰王辉杨克涛葛云科王熙帧
Owner JIANGSU KING LITHIUM CELL
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