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Method for preparing high-purity nanometer lithium manganate

A nanometer lithium manganate and potassium permanganate technology, applied in electrical components, battery electrodes, circuits, etc., to achieve the effects of low energy consumption, large specific capacity and low equipment requirements

Inactive Publication Date: 2015-04-29
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the essence of the preparation of lithium manganate by this technology is still a high-temperature solid-state reaction, and the hydrothermal reaction is only a precursor for the preparation of high-temperature solid-state reaction.

Method used

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  • Method for preparing high-purity nanometer lithium manganate
  • Method for preparing high-purity nanometer lithium manganate
  • Method for preparing high-purity nanometer lithium manganate

Examples

Experimental program
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Embodiment 1

[0020] The present embodiment comprises the following steps: preparing 40 mL of reaction solution and placing it in a hydrothermal kettle, wherein the reaction solution contains a mixed aqueous solution containing 0.48 g of potassium permanganate, 0.104 g of ascorbic acid, and 0.096 g of lithium hydroxide; Heat it at 180°C for 5 hours. After cooling to room temperature, wash and filter with suction to separate lithium manganate and dry it.

[0021] Such as figure 1 As shown, the nano-lithium manganese oxide prepared in this example is high-purity lithium manganate, and its purity is about 99.6%.

[0022] Such as figure 2 As shown, the lithium manganate particles prepared in this example are nanoscale particles with a size of about 50 nanometers and a uniform size distribution.

[0023] Such as image 3 and Figure 4 As shown, at different charge and discharge rates (0.1C, 0.5C, 1C and 5C), the charge and discharge performance of the prepared lithium manganate samples were...

Embodiment 2

[0025] This embodiment includes the following steps:

[0026] Prepare 80mL of reaction solution and place it in a hydrothermal kettle, wherein the reaction solution is a mixed aqueous solution containing 0.96g of potassium permanganate, 0.208g of ascorbic acid, and 0.192g of lithium hydroxide, then heat the hydrothermal kettle to 160°C and keep it warm for 8 hours. After cooling to room temperature, the lithium manganate was separated by washing and suction filtration, and dried.

[0027] The purity of the nano-lithium manganese oxide prepared in this example is about 99.3%.

[0028] The charge and discharge performance test was carried out on the prepared lithium manganese oxide sample. The charge-discharge cycle test results show that the specific capacities at 0.1C and 5C charge-discharge are about 124 and 82mAh g, respectively. ‐1 .

Embodiment 3

[0030] This embodiment includes the following steps:

[0031] Prepare 80mL of reaction solution and place it in a hydrothermal kettle, wherein the reaction solution is a mixed aqueous solution containing 0.96g of potassium permanganate, 0.18g of ascorbic acid, and 0.192g of lithium hydroxide, then heat the hydrothermal kettle to 200°C and keep it warm for 4 hours. After cooling to room temperature, the lithium manganate was separated by washing and suction filtration, and dried.

[0032] The purity of the nano-lithium manganese oxide prepared in this example is about 99.1%.

[0033] The charge and discharge performance test was carried out on the prepared lithium manganese oxide sample. The charge-discharge cycle test results show that the specific capacities at 0.1C and 5C charge-discharge are about 120 and 73mAh g, respectively. ‐1 .

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Abstract

The invention discloses a method for preparing high-purity nanometer lithium manganate in the field of lithium batteries. The high-purity nanometer lithium manganate is prepared by taking potassium permanganate, lithium hydroxide, ascorbic acid and deionized water as raw materials through hydrothermal reaction, wherein the purity of the high-purity nanometer lithium manganate is not less than 99 percent. The lithium manganate particles prepared by utilizing the method are nanoscale particles, the particle size distribution is uniform, and the high-purity nanometer lithium manganate has the advantages of high specific capacity, excellent rate charge and discharge performance and the like. Compared with the traditional method for preparing lithium manganate by utilizing high-temperature solid-phase reaction, the method disclosed by the invention is simple in process steps, low in equipment requirement and low in energy consumption, the nanoscale lithium manganate particles with excellent performance can be directly obtained, and the method has obvious advantages.

Description

technical field [0001] The invention relates to a technology in the field of preparation of lithium-ion battery electrode materials, in particular to a preparation method of nano-lithium manganese oxide with a purity of more than 99%. Background technique [0002] With the increasingly serious environmental pollution problems caused by the use of fossil energy, the green and pollution-free new energy industry has attracted more and more attention. As one of the representatives of the new energy industry, the lithium-ion battery industry has developed rapidly in recent years. Lithium manganese oxide, one of the most promising anode materials for lithium-ion batteries, has attracted widespread attention from researchers due to its low price, good low-temperature cycle performance, and no pollution to the environment. However, the traditional method for preparing lithium manganate materials is a high-temperature solid-phase method, which has a high reaction temperature and a l...

Claims

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Application Information

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IPC IPC(8): H01M4/505
CPCH01M4/136H01M4/1397H01M4/5825Y02E60/10
Inventor 郭守武伏勇胜沈文卓闫姣
Owner SHANGHAI JIAO TONG UNIV
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