Method for preparing lithium manganate anode materials of lithium ion battery

A battery lithium manganate and cathode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of uneven distribution of manganese and lithium, structural defects, inability to mix raw materials evenly, etc., to improve the cycle life and production process. Simple, low production cost effect

Active Publication Date: 2013-05-01
HUNAN XINDA NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, none of these mixing methods can fully mix the raw materials evenly, resulting in uneven distribution of manganese and lithium in the crystal structure of lithium manganate, causing defects in the structure, thereby affecting the stability and cycle life of the battery, and limiting the lithium manganate battery. wide application of

Method used

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  • Method for preparing lithium manganate anode materials of lithium ion battery
  • Method for preparing lithium manganate anode materials of lithium ion battery

Examples

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Embodiment 1

[0019] A preparation method of a lithium ion battery lithium manganate cathode material of the present invention, comprising the following steps:

[0020] (1) Pretreatment: Add lithium carbonate and manganese dioxide into a stirring mixer, mix and stir for 4 hours, where Li:Mn = 0.58:1 (molar ratio), place the resulting mixture in a rotary kiln, and keep warm at 650°C Run for 2 hours, then cool down naturally.

[0021] (2) Calcination: Put the pretreated product in a calcination furnace (in a tunnel kiln) to raise the temperature to 850°C, calcinate in air atmosphere for 15 hours, then cool down to below 600°C at a rate of 3°C / min, and then cool naturally to room temperature.

[0022] (3) The reaction product obtained in step (2) is crushed, and then sieved through 400 mesh to obtain lithium manganate cathode material (ie, lithium manganate powder) for lithium ion batteries.

[0023] Such as figure 1 As shown, curve A is the XRD pattern of the lithium manganate powder prepa...

Embodiment 2

[0027] A preparation method of a lithium ion battery lithium manganate cathode material of the present invention, comprising the following steps:

[0028] (1) Pretreatment: Add lithium hydroxide and spherical trimanganese tetroxide into a stirring mixer and stir for 4 hours, where Li:Mn = 0.58:1 (molar ratio), and place the resulting mixture in a rotary kiln at 500 Keep warm at ℃ for 2 hours, then cool down naturally.

[0029] (2) Calcination: heat the pretreated product to 800°C in a calcination furnace, calcine in an air atmosphere for 15 hours, then cool down to below 600°C at a rate of 3°C / min, and then cool naturally to room temperature.

[0030] (3) The reaction product obtained in step (2) is crushed, and then sieved through 400 mesh to obtain lithium manganate cathode material (ie, lithium manganate powder) for lithium ion batteries.

[0031] Such as figure 1 As shown, curve B is the XRD pattern of the lithium manganate powder prepared in this example. It can be seen...

Embodiment 3

[0034] A preparation method of a lithium ion battery lithium manganate cathode material of the present invention, comprising the following steps:

[0035] (1) Pretreatment: Add lithium carbonate and trimanganese tetraoxide into a stirring mixer and stir for 4 hours, where Li:Mn = 0.58:1 (molar ratio), and place the resulting mixture in a rotary kiln at 650°C Keep warm for 2 hours, then cool down naturally.

[0036](2) Calcination: heat up the pretreated product to 800°C in a calcination furnace, calcinate in an air atmosphere for 15 hours, then cool down to below 600°C at a rate of 3°C / min, and then cool naturally to room temperature.

[0037] (3) The reaction product obtained in step (2) is crushed, and then sieved through 400 mesh to obtain lithium manganate cathode material (ie, lithium manganate powder) for lithium ion batteries.

[0038] Such as figure 1 As shown, curve C is the XRD pattern of the lithium manganate powder prepared in this example. It can be seen from th...

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Abstract

The invention discloses a method for preparing lithium manganate anode materials of a lithium ion battery. The method comprises the following steps of: mixing and stirring lithium source compound and manganese source compound, placing the mixture into a rotary kiln and raising the temperature to 400-650 DEGC for pretreating, and keeping temperature for 1-8h and then cooling to normal temperature; and placing the product into a calcining furnace and raising the temperature to 750-1000 DEG C, calcining for 10-30h, then cooling the temperature to 550-650 DEG C at a speed of 1 DEG C / min-3 DEGC / min, cooling to the room temperature, and then crushing and screening the reaction product so as to obtain the lithium manganate anode materials of the lithium ion battery. The method is simple in technology and low in cost; and the battery assembled by the lithium manganate anode materials is excellent in cycling performance, high in specific capacity and wide in application prospect.

Description

technical field [0001] The invention belongs to the technical field of new materials, and in particular relates to a rotary kiln melting and mixing pretreatment method for lithium manganese oxide cathode material of a lithium ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high energy density, long cycle life, low self-discharge rate, and environmental protection. Therefore, its appearance has become a technological leap in the history of secondary batteries, and it has quickly occupied mobile phones, laptops, etc. Portable battery market, and hybrid electric vehicles and pure electric vehicles powered by lithium-ion batteries have been launched on the market. [0003] Cathode materials are an important part of lithium-ion batteries, and their performance and cost play a key role in the development and application of lithium-ion batteries. At present, the positive electrode material of lithium ion battery has lit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505
CPCY02E60/122Y02E60/10
Inventor 彭天剑斯钦图雅邓庭宣
Owner HUNAN XINDA NEW MATERIALS CO LTD
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