Preparation technique of lithium-ion battery anode material lithium iron phosphate

A lithium iron phosphate and lithium ion battery technology, applied in electrode manufacturing, battery electrodes, circuits, etc., can solve the problems of inconsistent technical indicators, few discharge times, and high costs, and achieve high technical indicators consistency, energy saving, Produce simple effects

Inactive Publication Date: 2009-10-07
XUZHOU HAITIAN GREEN ENERGY TECH
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AI Technical Summary

Problems solved by technology

However, traditional lead-acid batteries have insurmountable shortcomings. First, the pollution is serious, and lead and acid are serious pollution sources.
The second is self-heavy, small specific capacity
Third, the service life is short, and the number of charging and discharging is small
However, there are several problems in the production and application of lithium iron phosphate materials. First, the traditional production method has high requirements on the process.
Second, the product quality is unstable, and the technical indicators of each batch cannot be consistent
The third is higher cost; all these problems need to be solved urgently

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0026] Raw materials: iron powder Fe, lithium hydroxide LiOH or lithium carbonate Li 2 CO 3 and phosphate H 3 PO 4 .

[0027] Production equipment: ordinary reaction kettle, rotary sintering kiln.

[0028] Production process: first add iron powder and 50% phosphoric acid in equimolar amount to the reaction kettle, heat up to 85-90°C, stir to make it completely react, and then add lithium hydroxide LiOH solution in equimolar amount to the kettle , or add 1 / 2 mole of lithium carbonate Li 2 CO 3 Solution, stir to make it fully reacted. Lithium ferrous phosphate LiFePO 4 Precursor suspension. Transfer the suspension of lithium iron phosphate precursor to the sintering kiln, then add carbon-coated materials, raise the temperature to 150°C to completely evaporate the water, and then raise the temperature to 700°C for 20 hours to sinter under the protection of non-oxidizing gas. Obtain lithium iron phosphate LiFePO with the required olivine structure 4 crystals.

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Abstract

The invention discloses a preparation technique of the lithium-ion battery anode material lithium iron phosphate, which belongs to the preparation method of the battery anode material. The lithium iron phosphate is prepared by taking iron powder Fe, lithium hydroxide LiOH or lithium carbonate LI2CO3 and phosphoric acid (H3PO4) as raw materials according to the following processing steps of preparation of acid phosphate ferrous, preparation of iron lithium phosphate, and sintering. The preparation technique has the advantages of simple production process, easy operation, safety and reliability, pure product, stable quality, low costs, and no pollution to the environment.

Description

technical field [0001] The invention relates to a method for preparing battery anode materials, in particular to a preparation process for lithium-ion battery anode material lithium ferrous phosphate. Background technique [0002] With the decrease of fossil energy and the increasing attention of human beings to environmental pollution, it has become a top priority to find new clean energy, so the utilization of electric energy has been paid more and more attention by people. The batteries currently used on moving objects are generally lead-acid batteries. However, traditional lead-acid batteries have insurmountable shortcomings. First, the pollution is serious, and lead and acid are serious pollution sources. The second is self-heavy and small specific capacity. Third, the service life is short, and the times of charging and discharging are few. In recent years, lithium-ion batteries have developed rapidly. At present, the research on lithium iron phosphate batteries is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/58C01B25/45
CPCY02E60/12Y02E60/10
Inventor 张君曹高劭张陶张佳张杨
Owner XUZHOU HAITIAN GREEN ENERGY TECH
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