A high tap density lithium manganese iron phosphate positive electrode material and its preparation method and application

A technology of lithium iron manganese phosphate and cathode material, applied in chemical instruments and methods, battery electrodes, phosphorus compounds, etc., can solve the problems of low platform voltage, no batch protection circuits and chargers, application limitations, etc. The solid density, phase structure and chemical composition are uniform, and the cost of raw materials is low.

Active Publication Date: 2022-05-03
江苏元景锂粉工业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its low platform voltage (3.3V), there is no batch protection circuit and charger, so its application on electronic equipment is limited

Method used

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  • A high tap density lithium manganese iron phosphate positive electrode material and its preparation method and application
  • A high tap density lithium manganese iron phosphate positive electrode material and its preparation method and application
  • A high tap density lithium manganese iron phosphate positive electrode material and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A high-tap density lithium manganese iron phosphate positive electrode material is formed by mixing small particles of lithium manganese iron phosphate with a particle size of 0.5um and large particles of lithium manganese iron phosphate with a particle size of 4um in a mass ratio of 7:3.

[0038] A method for preparing a high tap density lithium manganese iron phosphate positive electrode material, specifically comprising the steps of:

[0039] Step (1) preparation of dense ferromanganese phosphate:

[0040](1) Slowly add respectively a concentration of 10wt% ferric chloride solution, a concentration of 10wt% manganous chloride solution, a concentration of 15wt% ammonium dihydrogen phosphate solution, stearic acid and citric acid in a mass ratio of 1:4 The concentration of the composition is a mixed solution of 5mg / Ml, a concentration of 15wt% ammonia solution in a three-necked flask, wherein the molar ratio of iron salt, manganese salt, phosphorus source, mixed soluti...

Embodiment 2

[0051] A high-tap density lithium manganese iron phosphate positive electrode material is made of small particles of lithium manganese iron phosphate with a particle size of 0.3um and large particles of lithium manganese iron phosphate with a particle size of 5um in a mass ratio of 1:9.

[0052] A method for preparing a high tap density lithium manganese iron phosphate positive electrode material, specifically comprising the steps of:

[0053] Step (1) preparation of dense ferromanganese phosphate:

[0054] (1) Slowly add respectively a concentration of 5wt% ferric sulfate solution, a concentration of 8wt% manganese sulfate solution, a concentration of 10wt% diammonium hydrogen phosphate solution, dodecylbenzenesulfonic acid and citric acid in a mass ratio of 1:3 The concentration of the composition is a mixed solution of 8mg / mL, and a sodium hydroxide solution with a concentration of 12wt% in a three-necked flask, wherein the molar ratio of iron salt, manganese salt, phosphor...

Embodiment 3

[0065] A high-tap density lithium manganese iron phosphate positive electrode material is made of small particles of lithium manganese iron phosphate with a particle size of 0.8um and large particles of lithium manganese iron phosphate with a particle size of 3um in a mass ratio of 3:7.

[0066] A method for preparing a high tap density lithium manganese iron phosphate positive electrode material, specifically comprising the steps of:

[0067] Step (1) preparation of dense ferromanganese phosphate:

[0068] (1) Slowly add respectively a concentration of 8wt% ferric sulfate solution, a concentration of 9wt% manganese sulfate solution, a concentration of 12wt% diammonium hydrogen phosphate solution, dodecylbenzenesulfonic acid and citric acid in a mass ratio of 1:3 The concentration of the composition is a mixed solution of 7mg / mL, a sodium hydroxide solution with a concentration of 18wt% in a three-necked flask, wherein the molar ratio of iron salt, manganese salt, phosphorus s...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and in particular relates to a high tap density lithium manganese iron phosphate positive electrode material and a preparation method and application thereof. The positive electrode material is prepared by mixing small particles of lithium manganese iron phosphate with a particle size of 0.3-0.8um and large particles of lithium manganese iron phosphate with a particle size of 3-5um in a mass ratio of 1-9:9-1, and the preparation method includes : (1) Preparation of dense ferromanganese phosphate; (2) Preparation of large and small particles of lithium iron manganese phosphate slurry; (3) Preparation of lithium iron manganese phosphate precursor powder; (4) Preparation of finished product of lithium iron manganese phosphate ; The obtained material is applied to the positive electrode material of lithium battery. The lithium manganese iron phosphate prepared by the invention has high tap density, high electrical capacity, good rate performance, high charge and discharge efficiency, large gram capacity, simple preparation process and easy control, low energy consumption and raw material cost, high production efficiency, It can be applied to large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a high tap density lithium manganese iron phosphate positive electrode material and a preparation method and application thereof. Background technique [0002] In the 21st century, human beings are facing two serious problems of energy crisis and environmental pollution, so the development and research of clean and renewable new energy has far-reaching significance. Among them, all kinds of vehicles account for about 40% of oil consumption, and 42% of global air pollution comes from the emissions of traffic vehicles. All countries in the world attach great importance to the development of electric vehicles, and my country's 863 plan also lists the development of electric vehicles as an important development direction. The research on the power battery as vehicle power has become the main bottleneck in the development of power vehicles. At present, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58
CPCH01M4/5825H01M10/0525C01B25/45C01P2004/03C01P2006/11Y02E60/10
Inventor 李德成黄国林王建琴
Owner 江苏元景锂粉工业有限公司
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