Preparation method of lithium abundant cathode material for lithium ion battery

A lithium-rich cathode material, lithium-ion battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as poor control of co-precipitation process, difficult dispersion and precipitation of nickel, cobalt, and manganese, and poor batch stability. , to achieve the effect of good batch stability, excellent electrochemical performance, and improved rate performance

Inactive Publication Date: 2012-02-29
SHANGHAI SINOPOLY JIAHUA BATTERY TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The defect of co-precipitation method is that it is not easy to obtain products with theoretical ratio, especially nickel, cobalt and manganese are difficult to uniformly disperse and precipitate, the co-precipitation process is not easy to control, and the batch stability is not good

Method used

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  • Preparation method of lithium abundant cathode material for lithium ion battery
  • Preparation method of lithium abundant cathode material for lithium ion battery
  • Preparation method of lithium abundant cathode material for lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0014] At 25°C, add 1.224 grams of lithium acetate to 50 grams of deionized water and stir until completely dissolved to obtain a lithium acetate solution; simultaneously add 0.497 grams of nickel acetate, 0.249 grams of cobalt acetate and 1.225 grams of manganese acetate to 100 grams of deionized water and stir until Completely dissolve to obtain a transition metal salt solution; add lithium acetate solution dropwise to the transition metal salt solution under stirring, continue stirring for 2 hours, and then transport it to a spray dryer at a feed rate of 3 mL / min by a metering pump for spray drying Granulate to obtain the precursor powder. The inlet temperature of the spray dryer is 200°C, and the outlet temperature is 110°C; the precursor powder is placed in a high-temperature furnace, and the temperature is raised at a heating rate of 10°C / min in an air atmosphere, and the temperature is kept at 900°C Calcined for 10 hours, then cooled to room temperature at a cooling rate...

Embodiment 2

[0017]At 25°C, add 1.122 grams of lithium acetate to 50 grams of deionized water and stir until completely dissolved to obtain a lithium acetate solution; simultaneously add 0.746 grams of nickel acetate, 0.125 grams of cobalt acetate and 1.348 grams of manganese acetate to 100 grams of deionized water and stir until Completely dissolve to obtain a transition metal salt solution; add the lithium acetate solution dropwise to the transition metal salt solution under stirring, continue stirring for 1.5 hours, and then transport it to a spray dryer at a feed rate of 6 mL / min by a metering pump for spray drying Granulate to obtain the precursor powder. The inlet temperature of the spray dryer is 210°C, and the outlet temperature is 120°C; the precursor powder is placed in a high-temperature furnace, and the temperature is raised at a heating rate of 10°C / min in an air atmosphere, and the temperature is kept at 800°C Calcined for 10 hours, then cooled to room temperature at a cooling...

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Abstract

The invention discloses a preparation method of a lithium abundant cathode material for a lithium ion battery. The preparation method comprises the following steps of: performing spray drying on manganese salt, cobalt salt, nickel salt and lithium salt which are dissolved in deionized water by a spray drying process to obtain precursor powder; and putting the precursor powder into a high temperature furnace, sintering under an air atmosphere, naturally cooling to room temperature, and thus obtaining a product, namely the lithium abundant cathode material Li[Ni2/5-xLixMn3/5-x/2Cox/2]O2 (x is more than 0 and less than 2/5). The lithium abundant cathode material prepared by the method has uniform particles with the average size of 200nm; and the cathode material of the lithium ion battery reflects extremely high discharging specific capacity, has the current charging/discharging density of 20mA/g and the initial-circle discharging capacity of 247mAh/g, and has the capacity retention rate of 99 percent after 10-time circulation. Compared with the conventional lithium abundant cathode material prepared by a co-precipitation method, the lithium abundant cathode material prepared by the method has a higher electrochemical property and high batch stability and is suitable for industrial mass production.

Description

technical field [0001] The invention relates to a method for preparing a battery material, in particular to a method for preparing a lithium-rich cathode material for a lithium ion battery. Background technique [0002] Due to the advantages of small size, large specific capacity, environmental friendliness, and low capacity fading after repeated charge and discharge, lithium-ion batteries are considered to be ideal chemical power sources today, and their applications in small mobile electronic devices have achieved great success. With the development of the global new energy vehicle field, large-scale power lithium-ion batteries are also actively being developed. In order to develop high-capacity, high-power, and stable cycle lithium-ion batteries, new electrode materials are the key. Especially, cathode materials, as one of the core components of lithium-ion batteries, have always been the focus of research and development. Lithium cobaltate is the earliest cathode materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/10
Inventor 廖小珍马紫峰王红
Owner SHANGHAI SINOPOLY JIAHUA BATTERY TECH
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