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Method for preparing presoma of active electrode material of nano-lithium ion battery and application thereof

An active electrode material, lithium-ion battery technology, applied in battery electrodes, nanotechnology, circuits, etc., can solve the problem of poor electronic conductivity and ion mobility, capacity, rate and cycle life performance, irregular morphology, complex process and other problems, to achieve the effect of excellent electrochemical performance of the product, improved electrochemical performance, and low preparation cost

Active Publication Date: 2011-06-01
GUANGXI NUOFANG ENERGY STORAGE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The shortcomings of the products obtained by the preparation method of the lithium iron phosphate precursor material reported in the above open literature are that the process is relatively complicated, the product purity is not high, the particles are large, the particle distribution is uneven, and the shape is irregular, which leads to its The electronic conductivity and ion mobility are not good, the capacity, rate and cycle life performance are still far from the requirements of application to production practice, and the cost performance of the product needs to be improved

Method used

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  • Method for preparing presoma of active electrode material of nano-lithium ion battery and application thereof
  • Method for preparing presoma of active electrode material of nano-lithium ion battery and application thereof
  • Method for preparing presoma of active electrode material of nano-lithium ion battery and application thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0038] Example 1: The precursor of lithium iron phosphate is prepared from the following raw materials in the following proportions

[0039] initial reactant

weight

Lithium formate

4.50 grams

Iron phosphate

12.00 grams

Cellulose acetate

1.30 grams

cetyltrimethylammonium bromide

0.10 grams

[0040] The specific preparation method is: put the above various raw materials in a container with isopropanol as the solvent and stir evenly, then raise the temperature of the system to 60°C, keep it warm at this temperature, stir and react for one hour, stop heating, and continue stirring for 15 hours Finally, obtain the lithium iron phosphate precursor slurry, dry the precursor slurry for an hour to obtain the lithium iron phosphate precursor dry powder A, place the precursor dry powder A in a tube furnace, and heat it at 350 °C under the protection of nitrogen gas. Calcined at ℃ for 4 hours, and after cooling, the pre-calci...

example 2

[0044] Example 2: According to the preparation method similar to Example 1, the nanometer lithium iron phosphate precursor was obtained by using the raw materials with the following ratio:

[0045] initial reactant

weight

lithium acetate

4280 grams

Iron phosphate

12000 grams

Ethyl cellulose

1300 grams

cetyltrimethylammonium bromide

100 g

[0046] The specific steps are as follows: use industrial alcohol as a solvent, uniformly mix the above compounds in a stainless steel reactor with a volume of 100 liters, heat up to 60 ° C, stir for 2 hours under heat preservation conditions, then stop heating, continue to stir for 20 hours, and then naturally Cooling, vacuum drying at 80°C to obtain a lithium iron phosphate precursor A, place this precursor A in an atmosphere furnace, and calcinate at 350°C for 3 hours under the protection of nitrogen gas to obtain a lithium iron phosphate precursor powder, The precursor powder...

example 3

[0048] Example 3: According to the preparation method similar to Example 1, a nanometer lithium iron phosphate precursor was prepared using the raw materials with the following ratio.

[0049] initial reactant

[0050] Stir and mix the above materials with industrial alcohol in a closed container for 0.5 hours, then raise the temperature to 60°C and react for 1 hour, then stop heating and continue stirring for 15 hours to obtain a precursor slurry, and vacuum the precursor slurry at 80°C After drying, the precursor A was obtained, and the precursor A was placed in an atmosphere furnace, and calcined at 350°C for 3 hours under the protection of nitrogen gas to obtain the lithium iron phosphate precursor powder, which was further pulverized with The equipment is crushed and sieved to obtain the precursor B of nano-lithium iron phosphate. The obtained lithium iron phosphate precursor B is placed in a nitrogen atmosphere furnace and calcined at 600° C. for 6 hours, and a...

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Abstract

The invention provides a method for preparing a precursor of an active electrode material of a nano-lithium ion battery. The method comprises the following steps: adopting an organic solvent method to mix a lithium source compound with other metal source compounds in an organic solvent under the condition of adding carbon source compounds or not adding carbon source compounds; heating to react a mixture for a fixed time and then stopping the reaction; separating the organic solvent; and drying to obtain the precursor. The precursor is a nano-sized powder with even particle distribution. An electrode material obtained by roasting the nano-sized precursor has good performances of high capacity, high multiplying power and longer cycle life.

Description

technical field [0001] The invention belongs to the technical field of battery active electrode materials, and in particular relates to a method and application for preparing a nanometer-sized lithium ion battery active electrode material precursor by using lithium source compounds and variable-valence metal compounds as raw materials. technical background [0002] As a new lithium-ion battery cathode material, phosphate series cathode materials (especially lithium iron phosphate (LiFePO4) and lithium vanadium phosphate (LiFePO4) 3 V 2 (PO 4 ) 3 ) is an important development direction of lithium-ion batteries at present, and the existing lithium-ion battery cathode material LiCoO 2 , LiMn 2 o 4 , LiNiO 2 Compared to LiFePO 4 It has excellent cycle performance and safety performance, and is environmentally friendly and rich in resources. The theoretical capacity of lithium ferrous phosphate is as high as 170mah / g, and it has a relatively stable discharge platform (com...

Claims

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Application Information

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IPC IPC(8): H01M4/1397B82Y40/00
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 黄桂清
Owner GUANGXI NUOFANG ENERGY STORAGE TECH
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