Lithium ion battery cathode material and preparation method thereof

A technology for lithium ion batteries and negative electrode materials, applied in the field of electrochemical materials, can solve problems such as insufficient performance of negative electrode materials, achieve good application development prospects, improve electronic conductivity, and have the effects of strong operability

Active Publication Date: 2013-11-27
HUNAN ZOOMWE NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defects of insufficient performance of lithium...

Method used

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  • Lithium ion battery cathode material and preparation method thereof
  • Lithium ion battery cathode material and preparation method thereof
  • Lithium ion battery cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The preparation of ferrous carbonate: comprise the following steps:

[0039] S1. Add 0.200 g of sodium lauryl sulfate into 40 mL of deionized water, stir it mechanically to completely dissolve it, and obtain solution A.

[0040] S2. Ferrous sulfate is added in solution A, the molar concentration of ferrous sulfate is 0.02mol / L, mechanically stirred until completely dissolved, obtains solution B.

[0041] S3. Add urea to solution B according to the molar concentration ratio of urea and ferrous sulfate is 50:1, after mechanical stirring makes it completely dissolved, adjust solution pH=4 with hydrochloric acid to obtain solution C, and then transfer solution C to poly In a tetrafluoroethylene-lined stainless steel reactor, the reactor was then placed in a blast oven at 100°C for 8 hours of reaction, and the reaction product was repeatedly washed with deionized water and ethanol to obtain a siderite-type ferrous carbonate negative electrode material. Such as figure 1 As ...

Embodiment 2

[0046] The preparation method of ferrous carbonate comprises the following steps:

[0047] S1. Add 0.200g of sodium lauryl sulfate into 40mL of deionized water, stir it with magnetic force to completely dissolve it, and obtain solution A.

[0048] S2. Ferrous sulfate is added in solution A, the molar concentration of ferrous sulfate is 0.05mol / L, magnetic stirring makes it dissolve completely, obtains solution B.

[0049] S3. Then add urea to solution B according to the molar concentration ratio of urea and ferrous sulfate is 30:1, after magnetic stirring to make it completely dissolved, adjust the pH of the solution to 2 with hydrochloric acid to obtain solution C, and then transfer solution C to Put the polytetrafluoroethylene-lined stainless steel reaction kettle, and then place the reaction kettle in a blast oven at 120°C for 8 hours of reaction, and wash the reaction product repeatedly with deionized water and ethanol to obtain ferrous carbonate.

[0050] The electrochem...

Embodiment 3

[0054] The preparation method of ferrous carbonate comprises the following steps:

[0055] S1. Add 0.200 g of sodium lauryl sulfate into 40 mL of deionized water, stir it mechanically to completely dissolve it, and obtain solution A.

[0056] S2. Ferrous sulfate is added in solution A, the molar concentration of ferrous sulfate is 0.10mol / L, mechanically stirred until completely dissolved, obtains solution B.

[0057] S3. Add urea into solution B according to the molar concentration ratio of urea and ferrous sulfate as 20:1, after mechanical stirring makes it dissolve completely, adjust the pH of the solution to 6 with hydrochloric acid to obtain solution C, then transfer solution C to Put the polytetrafluoroethylene-lined stainless steel reaction kettle, then place the reaction kettle in a blast oven at 160°C for 8 hours, and wash the reaction product repeatedly with deionized water and ethanol to obtain ferrous carbonate.

[0058] The electrochemical performance test of the...

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Abstract

The invention discloses a lithium ion battery cathode material and a preparation method thereof. According to the preparation method of the lithium ion battery cathode material, low-temperature hydrothermal method is employed, sodium dodecyl sulfate is used as a surfactant, a soluble ferrous salt and urea are used as raw materials, and the micro-nano scale ferrous carbonate cathode material is prepared at a certain temperature and in a certain period of time. The ferrous carbonate cathode material is used for lithium ion batteries for the first time, initial discharge specific capacity can reach to 900 to 1110mAh/g when electric current density is 200mA/g and voltage is 0.05 to 3.0V, and the specific capacity is maintained at 585 to 640mAh/g after 100 cycles of discharge. The specific capacity of the ferrous carbonate cathode material is high, cycle performance and multiplying power performance are excellent, sources of the raw materials are wide, and cost of the raw materials is low. In addition, the application of hydrothermal method is capable of synthesizing the ferrous carbonate cathode material at a relatively low temperature, the preparation method is simple, operability and repeatability are high, and application and development prospect is promising.

Description

technical field [0001] The invention relates to the field of electrochemical materials, and more specifically, to a lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] New energy vehicles are listed as one of the seven strategic emerging industries in the "Proposals of the Central Committee of the Communist Party of China on Formulating the Twelfth Five-Year Plan for National Economic and Social Development". Lithium-ion batteries and nickel-metal hydride batteries are the direct energy sources of new energy vehicles, and their level determines the development level of new energy vehicles. However, due to the urgent need for high-power power batteries required by new energy vehicles, and the current bottlenecks in lithium-ion power batteries such as price and safety, key materials for lithium-ion power batteries are facing new challenges. At present, graphitized carbon materials are the main anode materials for lit...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 禹筱元刘伟健方岳平罗国恩周训富
Owner HUNAN ZOOMWE NEW ENERGY TECH CO LTD
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