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High-tap-density lithium iron manganese phosphate positive electrode material, preparation method and applications thereof

A technology of lithium manganese iron phosphate and positive electrode materials, applied in chemical instruments and methods, phosphorus compounds, battery electrodes, etc., can solve the problems of application limitations, low platform voltage, no batch protection circuits and chargers, etc., and improve utilization The effect of increasing the rate, improving the tap density, the phase structure and the uniform chemical composition

Active Publication Date: 2019-01-22
江苏元景锂粉工业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • High-tap-density lithium iron manganese phosphate positive electrode material, preparation method and applications thereof
  • High-tap-density lithium iron manganese phosphate positive electrode material, preparation method and applications thereof
  • High-tap-density lithium iron manganese phosphate positive electrode material, preparation method and applications thereof

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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 particularly relates to a high-tap-density lithium iron manganese phosphate positive electrode material, a preparation methodand applications thereof, wherein the positive electrode material is formed by mixing small particle lithium iron manganese phosphate with a particle size of 0.3-0.8 [mu]m and large particle lithiumiron manganese phosphate with a particle size of 3-5 [mu]m according to a mass ratio of 1-9:9-1. The preparation method comprises: (1) preparation of dense iron manganese phosphate; (2) preparation oflarge particle lithium iron manganese phosphate slurry and small particle lithium iron manganese phosphate slurry; (3) preparation of lithium iron manganese phosphate precursor powder; and (4) preparation of lithium iron manganese phosphate finished product, wherein the obtained material is used for lithium battery positive electrode materials. According to the present invention, the prepared lithium iron manganese phosphate has advantages of high tap density, high electrical capacity, good rate performance, high charge and discharge efficiency and large gram capacity, and the preparation method has advantages of simple preparation process, easy control, low energy consumption, low raw material cost and high production efficiency, and is suitable for 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 Applications(China)
IPC IPC(8): C01B25/45H01M4/58H01M10/0525
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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