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

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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

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
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Example

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

[0039] Initial reactant

[0040] The specific preparation method is: put the above various raw materials in a container with isopropanol as the solvent and stir well, then raise the temperature of the system to 60°C, keep the temperature at this temperature, stir and react for one hour, stop heating, and continue stirring for 15 hours Then get the lithium iron phosphate precursor paddle. After drying the precursor paddle for an hour, the lithium iron phosphate precursor dry powder A is obtained. The precursor dry powder A is placed in a tube furnace and heated at 350°C under the protection of nitrogen gas. Calcined at °C for 4 hours, and after cooling, the pre-fired powder is crushed with a crushing device and sieved to prepare a nano lithium iron phosphate precursor B. The obtained lithium iron phosphate precursor B was calcined in a nitrogen atmo...

Example

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

[0045] Initial reactant

[0046] The specific steps are as follows: use industrial alcohol as a solvent, mix the above compounds in a 100-liter stainless steel reaction kettle and heat up to 60°C, stir for 2 hours under heat preservation, and then stop heating, continue to stir for 20 hours before natural After cooling and vacuum drying at 80°C, the lithium iron phosphate precursor A is obtained. The precursor A is placed in an atmosphere furnace and calcined at 350°C for 3 hours under the protection of nitrogen gas to obtain lithium iron phosphate precursor powder. The precursor powder is further crushed with a crushing device and sieved to prepare a nano lithium iron phosphate precursor B. The obtained lithium iron phosphate precursor B was calcined in a nitrogen atmosphere furnace at 600° C. for 6 hours, and a...

Example

[0048] Example 3: According to the preparation method similar to Example 1, the nano-lithium iron phosphate precursor was prepared with the raw materials in the following proportion.

[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 for 1 hour, then stop heating and continue stirring for 15 hours to obtain the precursor slurry, and vacuum the precursor slurry at 80°C Precursor A is obtained after drying. Place the precursor A in an atmosphere furnace and calcinate at 350°C for 3 hours under the protection of nitrogen gas to obtain lithium iron phosphate precursor powder, which is further crushed The equipment is crushed and sieved to obtain the precursor B of nano lithium iron phosphate. The obtained lithium iron phosphate precursor B was calcined in a nitrogen atmosphere furnace at 600°C for 6 hours, and after natural cooling, the lithium iron phosphate cathode ma...

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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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