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Method for producing positive pole material-orthorhombic system LiMnO2 of lithium secondary battery

A lithium secondary battery, orthorhombic crystal system technology, applied in the field of battery material preparation, can solve problems such as difficult mass production, and achieve the effects of good crystallinity, abundant resources, and good electrochemical performance

Inactive Publication Date: 2005-09-28
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The synthesis process requires strict requirements and the equipment requires precision, so it is difficult to carry out mass production

Method used

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  • Method for producing positive pole material-orthorhombic system LiMnO2 of lithium secondary battery
  • Method for producing positive pole material-orthorhombic system LiMnO2 of lithium secondary battery
  • Method for producing positive pole material-orthorhombic system LiMnO2 of lithium secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Mn(CH 3 OO) 2 4H 2 O, MnO 2 , LiOH·H 2 O was added to 40mL distilled water, stirred at room temperature in air for 4 hours, then placed in a 40ml autoclave, kept at 170°C for 5 days, washed with dilute oxalic acid to neutral pH, and then deionized water Wash, and finally dewater and dry the precipitate to obtain orthorhombic LiMnO 2 powder.

[0019] In the hydrothermal synthesis of LiMnO 2 During the process, the pH of the test solution before pouring the reaction solution into the reactor was 14, showing strong alkalinity. After the constant temperature reaction at 170°C, the pH value of the solution was still 14 when it was taken out of the kettle. From this we can know that LiMnO 2 A strong alkaline environment is required in the hydrothermal synthesis process. Therefore, an excessive amount of lithium hydroxide (LiOH·H 2 O), to ensure that the reaction is carried out under a strongly alkaline environment.

Embodiment 2

[0021] Select commercially available Mn(CH 3 OO) 2 4H 2 O, MnO with a molecular weight of 86.94 2 , LiOH·H with a molecular weight of 41.96 2 O was used as the starting material for the reaction. Mn(CH 3 OO) 2 4H 2 O, MnO 2 The consumption, hydrothermal synthesis temperature, reaction time and reaction process are identical with embodiment 1. Add raw material LiOH·H 2 The amount of O used is: 0.075mol; 0.095mol; 0.14mol, the resulting orthorhombic LiMnO 2 Performance, effect are basically the same as those in Example 1.

[0022] From the XRD spectrum of the sample, we can know that orthorhombic-LiMnO 2The half width of the peak increases slightly with the increase of LiOH concentration, but the maximum value is only 0.261° (as shown in Table 1). This shows that orthorhombic-LiMnO synthesized by hydrothermal method 2 The crystallinity is very good.

[0023] Table 1: Bandwidth values ​​of four strong peaks in XRD spectrum

[0024]

Embodiment 3

[0026] The hydrothermal synthesis temperature, reaction time and reaction process are the same as in Example 1. In order to study the influence of different reaction raw materials on the reaction products, we selected manganese chloride (MnCl) with a molecular weight of 197.91 2 4H 2 O), MnO with a molecular weight of 86.94 2 , LiOH·H with a molecular weight of 41.96 2 O as the starting material for the reaction. The molar ratio of the reaction raw materials is 0.005:0.005:0.14. The product obtained by the reaction orthorhombic-LiMnO 2 Performance, effect are substantially the same as in Example 1.

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Abstract

A method for preparing orthogonal crystallization system LiMnO2 includes dissolving bivalent Mn compound, MnO2 and LiOH as mole raio of 1 : 1 : 7.5-30 in distilled water, agitating it for 4-6 hours in the air at room temperature, filling it into high pressure reactor to react for 5-7 days at constant temperature of 170-230 deg c, washing it by thin oxalic acid to make it be neutral in pH value after it is taken out from reactor, washing it by distilled water or deionized water and finally drying precipitant for obtaining LiMnO2 powder product.

Description

technical field [0001] The invention belongs to a method for preparing a battery material, in particular to a lithium secondary battery cathode material-orthorhombic LiMnO 2 hydrothermal preparation method. Background technique [0002] Since the advent of lithium secondary batteries, it has been widely concerned worldwide. With its advantages of high voltage, high capacitance, long service life and good cycle performance, it has shown broad prospects and huge economic benefits in many fields such as portable electronic equipment, electric vehicles, space technology and national defense industry. [0003] The decisive factor for the performance of a lithium secondary battery is its positive electrode material. The working voltage of the battery (the extraction-insertion voltage of lithium ions in the positive electrode material), the working time (the energy storage density and charge-discharge cycle properties of the positive electrode material), and the stability (the st...

Claims

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Application Information

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IPC IPC(8): C01D15/00C01G1/02C01G45/00H01M4/04H01M4/48H01M4/50H01M4/58H01M10/36
CPCY02E60/122H01M10/052H01M4/505Y02E60/10
Inventor 陈岗赵丽竹杜菲王春忠黄祖飞
Owner JILIN UNIV
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