A kind of preparation method of titanium-doped lithium iron phosphate cathode material

A technology for lithium iron phosphate and positive electrode materials, which is applied in the direction of battery electrodes, structural parts, electrical components, etc., and can solve the problems of low specific capacitance and tap density, low electrical conductivity, low tap density, and preparation process of lithium iron phosphate positive electrode materials. Complicated problems, to achieve the effect of good consistency, low production cost and simple process

Active Publication Date: 2021-04-06
威远县大禾陶瓷原料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of low specific capacitance and tap density of the lithium iron phosphate positive electrode material due to the low electrical conductivity and tap density of the above-mentioned lithium iron phosphate positive electrode material and the complicated preparation process. The invention provides a preparation method of titanium-doped lithium iron phosphate cathode material

Method used

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  • A kind of preparation method of titanium-doped lithium iron phosphate cathode material
  • A kind of preparation method of titanium-doped lithium iron phosphate cathode material
  • A kind of preparation method of titanium-doped lithium iron phosphate cathode material

Examples

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Embodiment 1

[0031] A method for preparing a titanium-doped lithium iron phosphate cathode material, characterized in that it comprises the following steps:

[0032] (1) Get raw materials: get lithium carbonate 24.8g, ferric oxide 44.39g, ammonium dihydrogen phosphate 73.93g, metal titanium powder 2.4g;

[0033] (2) heating and melting: the raw materials are mixed evenly, put into a crucible, put into a melting furnace, and heat and melt to a glass state at a certain temperature;

[0034] (3) Water quenching: adding the mixture melted to a glass state into purified water with a water temperature of 30° C., performing water quenching, and filtering the obtained semi-finished lithium iron phosphate positive electrode material;

[0035] (4) Grinding and dispersing: take 0.10 times the glucose of the semi-finished lithium iron phosphate positive electrode material on a dry basis, add it to the semi-finished lithium iron phosphate positive electrode material, and the quality of the added purifi...

Embodiment 2

[0041] A method for preparing a titanium-doped lithium iron phosphate cathode material, characterized in that it comprises the following steps:

[0042] (1) Get raw materials: get lithium carbonate 24.8g, ferric oxide 43.42g, ammonium dihydrogen phosphate 73.93g, metal titanium powder 3g;

[0043] (2) heating and melting: the raw materials are mixed evenly, put into a crucible, put into a melting furnace, and heat and melt to a glass state at a certain temperature;

[0044] (3) Water quenching: adding the mixture melted to a glass state into purified water with a water temperature of 30° C., performing water quenching, and filtering the obtained semi-finished lithium iron phosphate positive electrode material;

[0045] (4) Grinding and dispersion: take 0.11 times the glucose of the semi-finished lithium iron phosphate positive electrode material on a dry basis, add it to the semi-finished lithium iron phosphate positive electrode material, and the quality of the added purified...

Embodiment 3

[0051] A method for preparing a titanium-doped lithium iron phosphate cathode material, characterized in that it comprises the following steps:

[0052] (1) Get raw materials: lithium carbonate 24.8g, ferric oxide 41.39g, ammonium dihydrogen phosphate 73.93g, metal titanium powder 4.2g;

[0053] (2) heating and melting: the raw materials are mixed evenly, put into a crucible, put into a melting furnace, and heat and melt to a glass state at a certain temperature;

[0054] (3) Water quenching: adding the mixture melted to a glass state into purified water with a water temperature of 30° C., performing water quenching, and filtering the obtained semi-finished lithium iron phosphate positive electrode material;

[0055] (4) Grinding and dispersion: take 0.12 times the glucose of the semi-finished lithium iron phosphate positive electrode material on a dry basis, and add it to the semi-finished lithium iron phosphate positive electrode material, and the quality of the added purifi...

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Abstract

The invention discloses a preparation method of titanium-doped lithium iron phosphate positive electrode material. Lithium source compound, phosphorus source compound, iron source compound and metal titanium are used as raw materials, mixed uniformly, melted at high temperature in a furnace, and quenched in water. into granules, and then together with carbon source compounds, through grinding and dispersion, so that the particle size reaches the fineness index of D90≤0.2μm, and then spray-dried to make powder, and calcined in an atmosphere furnace at 600-800°C for 40-300 minutes, After cooling, the lithium iron phosphate positive electrode material is obtained; the uniformity of the lithium iron phosphate positive electrode material is improved by adopting a high-temperature melting method; metal titanium powder is introduced, and the Fe in the melt is melted at a high temperature. 3+ reduced to Fe 2+ , and make the generated Ti 4+ Doped into the lithium iron phosphate structure, the electronic conductivity of the lithium iron phosphate positive electrode material is improved by forming vacancies; the specific surface area is reduced by grinding, dispersing and carbon coating, and the tap density of the lithium iron phosphate positive electrode material is improved. Breaking and integrating not only maintains the original sphericity but also simplifies the process.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a method for preparing a titanium-doped lithium iron phosphate cathode material. Background technique [0002] Since the lithium iron phosphate cathode material has an olivine structure, it can reversibly intercalate and remove lithium, and has high voltage, high specific capacity, good cycle performance, stable electrochemical performance, low raw material prices, and environmental friendliness. One of the best cathode materials for preparing long-life, high-power, high-safety, low-cost lithium-ion power batteries or energy storage batteries. However, lithium iron phosphate cathode materials have some inherent structural defects: lithium ion migration rate, electronic conductivity and tap density of the material are all low. [0003] At present, in order to improve the poor conductivity of synthetic materials, many synthesis processes use high-temperature solid-state-carbot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCY02E60/10
Inventor 张建胡智敏
Owner 威远县大禾陶瓷原料有限公司
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