A kind of porous structure lithium manganate electrode material and preparation method and application

A porous structure and electrode material technology, applied in battery electrodes, structural parts, circuits, etc., to achieve the effects of suppressing capacity decay, high rate performance and cycle performance, and easy implementation

Active Publication Date: 2011-12-14
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far, the preparation and electrochemical performance of lithium manganate electrode materials with one-dimensional porous structure, especially lithium manganate porous nanorods, have not been reported at home and abroad.

Method used

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  • A kind of porous structure lithium manganate electrode material and preparation method and application
  • A kind of porous structure lithium manganate electrode material and preparation method and application
  • A kind of porous structure lithium manganate electrode material and preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1 : Preparation of Porous LiMnO Nanorods

[0037] Add 7.5 mL of 0.8 M oxalate to a mixed solution consisting of 4 g of cetyltrimethylammonium bromide, 150 mL of cyclohexane, and 5 mL of n-pentanol, and stir at room temperature for 30 min to form a transparent microemulsion . Then 2.5 mL of 0.2 M manganese nitrate solution was added to the microemulsion and stirred for 12 hours. The reaction product was centrifuged, separated and washed to obtain a white powder. The white powder was decomposed at 450 °C to obtain a black product, and the black powder and lithium hydroxide were thoroughly mixed at a molar ratio of 1:1.02 and then calcined in air at 500 °C to obtain the target product.

[0038] figure 1 is a scanning electron microscope image of the porous nanorod, which shows that the porous nanorod has a diameter of about 300-500 nm and a length of about 2-5 μm.

Embodiment 2

[0039] Example 2 : Preparation of Porous LiMnO Nanorods

[0040] The preparation of lithium manganate porous nanorods is basically the same as in Example 1. The difference is that the black powder and lithium hydroxide are fully mixed according to the molar ratio of 1:1.02, and then calcined in air at 600 °C to obtain the target product.

[0041] figure 2 It is a scanning electron microscope image of the porous nanorod, which shows that its shape and size are similar to those of the material prepared according to the method described in Example 1.

Embodiment 3

[0042] Example 3 : Preparation of Porous LiMnO Nanorods

[0043] The preparation of lithium manganate porous nanorods is basically the same as in Example 1. The difference is that the black powder and lithium hydroxide are fully mixed according to the molar ratio of 1:1.02, and then calcined in air at 700 °C to obtain the target product.

[0044] image 3 is the scanning electron microscope image of the porous nanorod, Figure 4 It is a transmission electron microscope image of the porous nanorod, which shows that the shape and size of the lithium manganate sample prepared according to the method described in Example 3 are similar to those prepared according to the method described in Example 1, and the lithium manganate sample It is composed of tiny nanoparticles.

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Abstract

The invention provides a lithium manganese oxide electrode material with a porous structure. The material has a one-dimensional porous structure and comprises lithium manganese oxide porous nanorods, lithium manganese oxide porous submicron rods and lithium manganese oxide porous micron rods. A manufacturing method of the material comprises the following steps: adding oxalate into an organic mixed solution and then adding a manganese salt solution for reaction; carrying out centrifugation, separation and washing on a white product and then heating to decompose the processed white product to obtain a black product; and adding lithium to the black product for mixing and roasting to obtain a target product, namely, the lithium manganese oxide electrode material, wherein the lithium manganeseoxide electrode material can be used for manufacturing the lithium manganese oxide anode of a lithium ion battery. According to the invention, the lithium manganese oxide electrode material can form a spinel phase with rich lithium, has the larger specific area, and can increase the contact area of active substances and an electrolyte; the lithium manganese oxide electrode material has smaller internal grains which can form a dispersion channel capable of shortening ions, thus improving the electrochemical performance; and the lithium manganese oxide electrode material has good high multiplying power performance and cycle performance, thus being possible to apply to the new-generation power batteries massively. The manufacturing method is simple in process, easy to implement and beneficial to popularization and application.

Description

technical field [0001] The invention relates to an electrode material and a preparation method, in particular to a porous structure lithium manganate electrode material, a preparation method and an application. Background technique [0002] In recent years, lithium-ion batteries have developed rapidly due to their advantages of high operating voltage, high energy density, long cycle life, wide operating temperature range, safety and no memory effect. Especially with the development of electric vehicles, lithium-ion batteries provide new power sources for them. However, the current commercial cathode material lithium cobalt oxide has become a bottleneck in the development of power vehicles due to price, environmental and safety issues. Therefore, the development of low-cost, environmentally friendly and safe alternative materials has become the main goal of the development of lithium-ion battery cathode materials. Among them, lithium manganese oxide with a spinel structure ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/1391H01M4/131
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 陈军王洪波程方益陶占良张天然朱智强
Owner NANKAI UNIV
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