Lithium ion battery manganese cobalt lithium oxide anode material and preparation method thereof

A battery manganese cobalt lithium, positive electrode material technology, applied in the direction of battery electrodes, secondary batteries, electrochemical generators, etc., can solve the problems of not being able to fully mix metal ions, easily introducing impurity ions, and affecting the electrochemical performance of positive electrode materials , achieve excellent electrochemical performance, improve purity, and be easy to control

Inactive Publication Date: 2014-04-09
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this method has many disadvantages, for example: (1) It is easy to introduce impurity ions (Na + ); (2) Can not achieve sufficient mixing of metal ions, etc., thus affecting the electrochemical performance of the positive electrode material

Method used

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  • Lithium ion battery manganese cobalt lithium oxide anode material and preparation method thereof
  • Lithium ion battery manganese cobalt lithium oxide anode material and preparation method thereof
  • Lithium ion battery manganese cobalt lithium oxide anode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: Li 1.2 mn 0.4 co 0.4 o 2 Cathode material

[0027] Using lithium acetate, manganese acetate, and cobalt acetate as starting materials, 2.8158 g of lithium acetate, 1.9607 g of manganese acetate, and 1.9926 g of cobalt acetate were dissolved in 100 mL of deionized water to form a clear solution; 3.6436 g of mannitol was dissolved in 100 mL of deionized water Form a mannitol aqueous solution; drop the mannitol solution into the above metal salt solution drop by drop, adjust the pH value to 2 with concentrated nitric acid, stir for 1 hour and evaporate to dryness at 80°C to obtain a xerogel; heat the xerogel After spontaneous combustion, the precursor of lithium manganese cobalt oxide is obtained; the precursor is heat treated at 900 ° C for 15 hours, and quenched at room temperature to obtain Li 1.2 mn 0.4 co 0.4 o 2 Cathode material. figure 1 Li prepared for this example 1.2 mn 0.4 co 0.4 o 2 The X-ray diffraction pattern of the positive electrode ...

Embodiment 2

[0028] Example 2: Li 1.033 mn 0.067 co 0.9 o 2 Cathode material

[0029]Using lithium acetate, manganese acetate, and cobalt acetate as starting materials, 2.4239 g of lithium acetate, 0.3284 g of manganese acetate, and 4.4834 g of cobalt acetate were dissolved in 100 mL of deionized water to form a clear solution; 3.6436 g of mannitol was dissolved in 100 mL of deionized water Form a mannitol aqueous solution; drop the mannitol solution into the above metal salt solution drop by drop, adjust the pH value to 2 with concentrated nitric acid, stir for 1 hour and evaporate to dryness at 80°C to obtain a xerogel; heat the xerogel After spontaneous combustion, the precursor of lithium manganese cobalt oxide is obtained; the precursor is heat treated at 900 ° C for 15 hours, and quenched at room temperature to obtain Li 1.033 mn 0.067 co 0.9 o 2 Cathode material. The XRD test results of powder materials show that the synthesized powder has a layered rock-salt structure (R3m)...

Embodiment 3

[0030] Example 3: Li 1.1 mn 0.2 co 0.7 o 2 Cathode material

[0031] Using lithium acetate, manganese acetate, and cobalt acetate as starting materials, 2.5811 g of lithium acetate, 0.9804 g of manganese acetate, and 3.4871 g of cobalt acetate were dissolved in 100 mL of deionized water to form a clear solution; 3.6436 g of mannitol was dissolved in 100 mL of deionized water Form a mannitol aqueous solution; drop the mannitol solution into the above metal salt solution drop by drop, adjust the pH value to 2 with concentrated nitric acid, stir for 1 hour and evaporate to dryness at 80°C to obtain a xerogel; heat the xerogel After spontaneous combustion, the precursor of lithium manganese cobalt oxide is obtained; the precursor is heat treated at 900 ° C for 15 hours, and quenched at room temperature to obtain Li 1.1 mn 0.2 co 0.7 o 2 Cathode material. The XRD test results of powder materials show that the synthesized powder has a layered rock-salt structure (R3m). The ...

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Abstract

The invention discloses a lithium ion battery manganese cobalt lithium oxide anode material and a preparation method thereof. The chemical formula of the anode material is Li(3+x) / 3Mn2x / 3Col-xO2, wherein the x is greater than or equal to 0.1 and is less than or equal to 0.9. The lithium ion battery manganese cobalt lithium oxide anode material disclosed by the invention is prepared by adopting a sol-gel burning method. The preparation method disclosed by the invention has the advantages that the operation is simple, the production cost is low, the synthesis period is short, the repeatability is high and the like, the impurity ions are not introduced, the product purity is greatly improved, and lithium ions and transition metal ions are uniformly mixed under the assistance of mannitol; the method is widely applied in the synthesis of the lithium ion battery oxide anode material.

Description

technical field [0001] The invention relates to a manganese-cobalt-lithium oxide cathode material in the field of lithium-ion batteries and a preparation method thereof. Background technique [0002] With the intensification of energy crisis and environmental problems, it is particularly important to develop new clean energy storage devices and environmentally friendly power devices. With the advantages of high voltage, high capacity, long cycle life, safety and environmental protection, lithium-ion batteries have great application prospects in the field of energy storage and power devices. As the most important component of lithium-ion batteries, cathode materials determine the electrochemical performance of lithium batteries. Therefore, the research and development of cathode materials has received extensive attention. Currently, LiCoO 2 It is the most widely used cathode material, but its reversible capacity is only 140mAh / g, which is far from meeting the high-capacity...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 李丽萍付超超李广社
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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