Li2MnO3 and LiCoO2 composite anode material

A technology of composite cathode materials and composite oxides, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of complicated operation, environmental protection and energy saving, etc., achieve good repeatability, improve electrochemical performance, save energy The effect of production costs

Inactive Publication Date: 2012-10-24
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

For example, using Al 2 o 3 or AlF 3 Coated LiCoO 2 , both of which add an additional production process, which complicates the operation; the latter will also generate HF gas during coating, which is not advisable in terms of environmental protection and energy conservation.

Method used

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  • Li2MnO3 and LiCoO2 composite anode material
  • Li2MnO3 and LiCoO2 composite anode material
  • Li2MnO3 and LiCoO2 composite anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: 0.075Li 2 MnO 3 0.925LiCoO 2 Composite cathode material

[0031] Using lithium acetate, manganese acetate, cobalt acetate and sodium hydroxide as starting materials, ball mill 1.5mmol manganese acetate, 18.5mmol cobalt acetate and 25.8mmol lithium acetate at room temperature for 0.5h, then add 137.4mmol sodium hydroxide at room temperature Ball milled for 2.5 hours to obtain a mixture, the molar ratio of sodium hydroxide to total metal ions was 3:1. The mixture was dried at 180°C for 3 h, then ground into powder and loaded into a crucible. Heat in a box furnace at a rate of 4°C / min to 350°C for 3 hours, then raise the temperature to 900°C and heat for 10 hours, then cool to room temperature with the furnace. After washing several times with deionized water, filter, dry the filter residue at 180°C for 3 hours, transfer the sample to a crucible after drying, heat treatment in a box furnace at 900°C for 6 hours, and anneal at room temperature to obtain 0.075...

Embodiment 2

[0032] Example 2: 0.025Li 2 MnO 3 0.975LiCoO 2 Composite cathode material

[0033] Using lithium acetate, manganese acetate, cobalt acetate and sodium hydroxide as starting materials, ball mill 0.5mmol manganese acetate, 19.5mmol cobalt acetate and 24.6mmol lithium acetate at room temperature for 0.5h, then add 133.8mmol sodium hydroxide at room temperature Ball milled for 2.5 hours to obtain a mixture, the molar ratio of sodium hydroxide to total metal ions was 3:1. The mixture was dried at 180°C for 3 h, then ground into powder and loaded into a crucible. Heat in a box furnace at a rate of 4°C / min to 350°C for 3 hours, then raise the temperature to 900°C and heat for 10 hours, then cool to room temperature with the furnace. After washing several times with deionized water, filter, dry the filter residue at 180°C for 3 hours, transfer the sample to a crucible after drying, heat treatment in a box furnace at 900°C for 6 hours, and anneal at room temperature to obtain 0.025...

Embodiment 3

[0034] Example 3: 0.05Li 2 MnO 3 0.95LiCoO 2 Composite cathode material

[0035] Using lithium acetate, manganese acetate, cobalt acetate and sodium hydroxide as raw materials, 1mmol of manganese acetate, 19mmol of cobalt acetate and 25.2mmol of lithium acetate were ball-milled at room temperature for 0.5h, and then 135.6mmol of sodium hydroxide was added and ball-milled for 2.5h at room temperature. A mixed material was obtained, and the molar ratio of sodium hydroxide to total metal ions was 3:1. The mixture was dried at 180°C for 3 h, then ground into powder and loaded into a crucible. Heat in a box furnace at a rate of 4°C / min to 350°C for 3 hours, then raise the temperature to 900°C and heat for 10 hours, then cool to room temperature with the furnace. After washing several times with deionized water, filter, dry the filter residue at 180°C for 3 hours, transfer the sample to a crucible after drying, heat treatment in a box furnace at 900°C for 6 hours, and anneal at ...

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Abstract

The present invention discloses a Li2MnO3 and LiCoO2 composite anode material, which is a Li2MnO3 and LiCoO2 composite oxide meeting a stoichiometric ratio of xLi2MnO3.yLiCoO2, wherein x is more than or equal to 0.025 and is less than or equal to 0.15, and x plus y equals 1. The Li2MnO3 and LiCoO2 composite anode material of the present invention has characteristics of high specific capacity and high cycle life, and further has excellent performances under conditions of high rate, high temperature, low temperature, and the like.

Description

technical field [0001] The present invention relates to a kind of Li in the lithium ion battery field 2 MnO 3 and LiCoO 2 composite cathode materials. Background technique [0002] Due to the advantages of high voltage, high capacity, long cycle life, good safety performance, and environmental protection, lithium-ion batteries have been widely used in portable electronic equipment, power devices, aerospace, space technology and other fields. Lithium cobalt oxide (LiCoO 2 ) is a positive electrode material that has been widely used commercially, but if the voltage is greater than 4.2V during the charge and discharge process, it is very prone to phase transition, from a layered structure phase to a cubic structure phase, resulting in lithium ion deintercalation process The medium structure is very unstable, and the electrochemical performance is not ideal, so it needs to be further modified. The existing modification methods for lithium cobaltate materials all adopt a two...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122Y02E60/10
Inventor 李莉萍罗冬余创关翔锋李广社
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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