Method for preparing lithium manganate hollow ball material

A hollow ball, lithium manganate technology, applied in the direction of manganate/permanganate, etc., can solve the problems of difficulty in ensuring uniform mixing of raw materials, difficulty in obtaining lithium manganate materials, affecting product performance, etc., to achieve superior rate performance, Good cycle performance and rate capability, easy processing results

Inactive Publication Date: 2010-12-01
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The traditional solid-state reaction method generally uses ball milling to mix raw materials. This process not only consumes a lot of energy, but it is often difficult to ensure the uniform mixing of raw materials, and it is difficult to obtain lithium manganate materials with regular and uniform morphology, which affects the performance of the final product.

Method used

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  • Method for preparing lithium manganate hollow ball material
  • Method for preparing lithium manganate hollow ball material
  • Method for preparing lithium manganate hollow ball material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 31.7 g of manganese chloride tetrahydrate was dissolved in 800 g of water and 63.2 g of ethanol to obtain solution A, and 16.8 g of sodium bicarbonate was dissolved in 800 g of water to obtain solution B. Pour solution B into solution A under vigorous stirring, continue stirring for 2 hours, filter with suction and dry to obtain microspheres of manganese carbonate. The prepared manganese carbonate microspheres were calcined at 400° C. for 2 hours to obtain porous manganese dioxide microspheres. Dissolve 0.6 g of lithium hydroxide monohydrate in 20 g of ethanol, add 2.44 g of porous manganese dioxide microspheres, stir evenly, evaporate the solvent at room temperature, and roast at 700 °C for 10 hours to obtain lithium manganate hollow sphere materials.

Embodiment 2

[0031] 128 g of 50 wt% manganese nitrate was dissolved in 800 g of water and 63.2 g of ethanol to obtain solution A, and 33.6 g of sodium bicarbonate was dissolved in 800 g of water to obtain solution B. Pour solution B into solution A under vigorous stirring, continue stirring for 2 hours, filter with suction and dry to obtain microspheres of manganese carbonate. The prepared manganese carbonate microspheres were calcined at 400° C. for 2 hours to obtain porous manganese dioxide microspheres. Dissolve 0.6 g of lithium hydroxide monohydrate in 20 g of ethanol, add 2.44 g of porous manganese dioxide microspheres, stir evenly, evaporate the solvent at room temperature, and roast at 700 °C for 10 hours to obtain lithium manganate hollow sphere materials.

Embodiment 3

[0033] 31.7 g of manganese chloride tetrahydrate was dissolved in 800 g of water and 63.2 g of ethanol to obtain solution A, and 21.2 g of sodium carbonate was dissolved in 800 g of water to obtain solution B. Pour solution B into solution A under vigorous stirring, continue stirring for 2 hours, filter with suction and dry to obtain microspheres of manganese carbonate. The prepared manganese carbonate microspheres were calcined at 400° C. for 10 hours to obtain porous manganese dioxide microspheres. Dissolve 0.99 g of lithium hydroxide monohydrate in 20 g of water, add 2.44 g of porous manganese dioxide microspheres, stir well, evaporate the solvent at room temperature, and roast at 700 °C for 10 hours to obtain lithium manganate hollow sphere materials.

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Abstract

The invention belongs to the technical field of new energy materials, and particularly relates to a method for preparing a lithium manganate hollow ball material capable of serving as a lithium-ion battery anode material. The method comprises the following steps of: roasting manganese carbonate micro balls obtained by precipitation reaction and serving as a precursor to obtain porous manganese dioxide, further soaking lithium salt into the porous manganese dioxide material, and drying and roasting the material to obtain the lithium manganate hollow ball material. The method can prepare the lithium manganate hollow balls with regular and uniform appearance and grain diameter of 0.5 to 5 microns, and has the advantages of simple process and good repeatability; and the product has good electrochemical performance, the initial discharge capacity of the material is 120mAh/g, the capacity is kept over 96 percent after 100 cycles of charge and discharge under 1C current, and the material is a good lithium-ion battery anode material.

Description

technical field [0001] The invention belongs to the technical field of new energy materials, and in particular relates to a preparation method of a lithium manganate hollow sphere material which can be used as a positive electrode material of a lithium ion battery. Background technique [0002] Lithium manganese oxide material is a high-quality and low-cost lithium-ion battery cathode material. It has the advantages of abundant resources, simple synthesis, safety and environmental protection, and is recognized as one of the most promising cathode materials for lithium-ion batteries. The solid-state reaction method has become the mainstream method for the synthesis of lithium manganate materials due to its simplicity and practicality. The traditional solid-state reaction method generally uses ball milling to mix raw materials. This process not only consumes a lot of energy, but it is often difficult to ensure the uniform mixing of raw materials, and it is difficult to obtain ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/12
Inventor 王韵华周亮黄晓丹胡轶凡余承忠
Owner FUDAN UNIV
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