Method for synthesizing lithium-ion battery cathode material lithium manganese iron phosphate by microwave method

A technology for lithium ion batteries and cathode materials, which is applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve the problems of complex process, poor performance and high cost, and achieve uniform structure, good performance and good product performance. Effect

Active Publication Date: 2016-04-06
山东派智新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the disadvantages of complex process, high cost and poor performance of lithium-ion battery cathode materials in the prior art, and provide a lithium-ion battery cathode material with short reaction time, simple process, low energy consumption and low cost LiMn 0.7 Fe 0.3 PO 4 synthesis method

Method used

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  • Method for synthesizing lithium-ion battery cathode material lithium manganese iron phosphate by microwave method
  • Method for synthesizing lithium-ion battery cathode material lithium manganese iron phosphate by microwave method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1: A kind of microwave method synthesis LiMn of lithium-ion battery cathode material 0.7 Fe 0.3 PO 4 method, including the following steps:

[0036] (1) Will Li 2 CO 3 , Fe 2 o 3 1. Li, Fe and P in phosphoric acid are respectively measured according to the molar ratio of 1:0.95:0.98, and pure water is added to phosphoric acid to prepare a 70-75wt% phosphoric acid solution; then 8-12% of its weight is added to the phosphoric acid solution citric acid, stir well, prepare the aqueous solution of citric acid and phosphoric acid;

[0037] (2) Will Li 2 CO 3 Slowly added to the aqueous solution of citric acid and phosphoric acid, stirred evenly, and then slowly added Fe 2 o 3 , stir evenly to obtain a paste mixture, and age for 20 to 25 hours;

[0038] (3) Put the aged paste mixture in a non-metal container, put it into a closed microwave oven with a power of 20-25KW, use microwaves to heat up to 200-230°C at a rate of 3-8°C per minute, and then Maintai...

Embodiment 2

[0045] Embodiment 2: A kind of microwave method synthesis LiMn of lithium-ion battery cathode material 0.7 Fe 0.3 PO 4 method, including the following steps:

[0046] (1) Will Li 2 CO 3 , Fe 2 o 3 1. Li, Fe, and P in phosphoric acid are respectively measured at a molar ratio of 1:0.98:1.02, and pure water is added to phosphoric acid to prepare a 70% phosphoric acid solution; then 10% of its weight in citric acid is added to the phosphoric acid solution, Stir evenly to prepare an aqueous solution of citric acid and phosphoric acid;

[0047] (2) Will Li 2 CO 3 Slowly added to the aqueous solution of citric acid and phosphoric acid, stirred evenly, and then slowly added Fe 2 o 3 , stir evenly to obtain a paste mixture, and age for 20 hours;

[0048] (3) Put the aged paste mixture in a graphite crucible, put it into a closed microwave oven with a power of 20KW, use microwaves to raise the temperature to 210°C at a rate of 5°C per minute, and keep it at this temperature ...

Embodiment 3

[0055] Embodiment 3: A kind of microwave method synthesis LiMn of positive electrode material of lithium ion battery 0.7 Fe 0.3 PO 4 method, including the following steps:

[0056] (1) Will Li 2 CO 3 , Fe 2 o 3 1. Li, Fe, and P in phosphoric acid are respectively measured at a molar ratio of 1:0.96:1, and pure water is added to phosphoric acid to prepare a 75% phosphoric acid solution; then 12% citric acid by weight is added to the phosphoric acid solution, and stirred Evenly, the aqueous solution of citric acid and phosphoric acid is prepared;

[0057] (2) Will Li 2 CO 3 Slowly added to the aqueous solution of citric acid and phosphoric acid, stirred evenly, and then slowly added Fe 2 o 3 , stir evenly to obtain a paste mixture, and age for 25 hours;

[0058] (3) Put the aged paste mixture in a non-metal container, put it into a closed microwave oven with a power of 25KW, use microwaves to raise the temperature to 230°C at a rate of 8°C per minute, and keep it at t...

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Abstract

The invention relates to a method for synthesizing LiMn0.7Fe0.3PO4, a positive electrode material of a lithium ion battery, by using a microwave method. After measuring Li2CO3, Fe2O3 and phosphoric acid in a certain molar ratio, the phosphoric acid is made into a phosphoric acid solution, and citric acid is added to the phosphoric acid solution. Prepare an aqueous solution of citric acid and phosphoric acid; add Li2CO3 and Fe2O3, stir evenly to obtain a paste mixture; obtain precursor A after aging and microwave heat treatment; use Li2CO3, MnCO3 or MnO2, and phosphoric acid as raw materials to prepare precursors in the same way B. Mix the precursors A and B, add glucose solution to obtain the paste precursor; finally obtain the positive electrode material through microwave sintering. The battery cathode material of the invention has better charge and discharge capacity and cycle times; the battery has high capacity and better performance. The use of microwave treatment can be precisely controlled, the process is simple, no pollution, and is conducive to environmental protection.

Description

technical field [0001] The invention relates to a method for synthesizing the positive electrode active material of a lithium ion battery, in particular to a method for synthesizing the positive electrode material LiMn of a lithium ion battery by a microwave method. 0.7 Fe 0.3 PO 4 Methods. Background technique [0002] Lithium iron phosphate lithium ion battery is made of lithium iron phosphate (LiFePO 4 , referred to as LFP) material as the lithium-ion battery of the positive electrode of the battery. The main advantage of lithium iron phosphate battery is that it is safe to use. The chemical bond of phosphate root is stronger than the chemical bond of traditional transition metal oxide structure, so the structure is more stable and it is not easy to release oxygen. Lithium iron phosphate completely solves the problem of lithium cobalt oxide and manganese. Lithium-acid safety hazards. Lithium iron phosphate batteries are currently the only absolutely safe lithium-ion b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58C01B25/45
CPCC01B25/45H01M4/5825H01M10/0525Y02E60/10
Inventor 刘新保
Owner 山东派智新能源科技有限公司
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