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Preparation method and application of lithium iron manganese phosphate cathode material

A technology of lithium iron manganese phosphate and positive electrode materials, applied in the direction of phosphate, phosphorus oxyacids, chemical instruments and methods, etc., can solve the problems of poor cycle stability, low reversible capacity, large electronic transition energy gap, etc., and achieve energy saving effect

Inactive Publication Date: 2020-09-08
王子韩
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, theoretical calculations prove that lithium manganese phosphate has a large electronic transition energy gap, which basically belongs to the category of insulators, resulting in low reversible capacity and poor cycle stability of the material. These factors have also become bottlenecks hindering the further development of LMP materials.

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  • Preparation method and application of lithium iron manganese phosphate cathode material
  • Preparation method and application of lithium iron manganese phosphate cathode material
  • Preparation method and application of lithium iron manganese phosphate cathode material

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preparation example Construction

[0026] A preparation method of lithium iron manganese phosphate positive electrode material, the preparation method is as follows:

[0027] S1, the reaction raw material by product LiFe 0.3 mn 0.7 PO 4 The stoichiometric ratio is accurately weighed;

[0028] S2, putting the reaction raw materials in step S1 into a high-energy ball mill to perform high-energy ball mill pre-reaction;

[0029] S3. After the high-energy ball milling is completed, the product in step S3 is separated, and transferred to deionized water for dispersion, and then low-temperature hydrothermal reaction is carried out;

[0030] S4. After the low-temperature hydrothermal reaction is completed, the product in step S4 is separated, ground in an agate mortar, and then calcined.

[0031] Specifically, the lithium source used in the present invention is lithium chloride, the phosphorus source used is ammonium dihydrogen phosphate, the manganese source used is manganese dioxide, and the iron source used is f...

Embodiment 1

[0036] By product LiFe 0.3 mn 0.7 PO 4The stoichiometric ratio of reaction materials Lithium Chloride, Ammonium Dihydrogen Phosphate, Manganese Dioxide and Ferrous Chloride were weighed, the above materials were put into a high-energy ball mill, and the high-energy ball mill was high-energy ball milled at a speed of 3200rpm for 40min; Take it out, add deionized water, react in a hydrothermal reactor at 80°C for 1.5h, take it out and cool it down to room temperature naturally, then separate it by centrifugal filtration, and then dry it in a vacuum oven at 100°C, the dried product Grinding in an agate mortar, and then calcining in a muffle furnace at 500°C for 7 hours under the protection of argon to obtain the final product LiFe 0.3 mn 0.7 PO 4 Cathode material.

Embodiment 2

[0038] By product LiFe 0.3 mn 0.7 PO 4 The stoichiometric ratio of the reaction materials was taken by weighing lithium chloride, ammonium dihydrogen phosphate, manganese dioxide and ferrous chloride, and the above-mentioned substances were put into a high-energy ball mill, and high-energy ball milled at a speed of 3500rpm for 30min; Take it out, add deionized water, react in a hydrothermal reactor at 80°C for 2 hours, take it out and cool it to room temperature naturally, then separate it by centrifugal filtration, and then dry it in a vacuum oven at 100°C. The dried product is in Grinding in an agate mortar, and then calcining in a muffle furnace at 500°C for 7 hours under the protection of argon to obtain the final product LiFe 0.3 mn 0.7 PO 4 Cathode material.

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Abstract

The invention discloses a preparation method of a lithium iron manganese phosphate cathode material. The LiFe0. 3Mn0. 7PO4 cathode material with excellent performance is provided by taking cost saving, energy consumption reduction, preparation process optimization and easy large-scale preparation as entry points. The preparation method comprises the following steps: S1, accurately weighing reaction raw materials according to the stoichiometric ratio of the product LiFe0. 3Mn0. 7PO4; S2, putting the reaction raw materials in the S1 into a high-energy ball mill for high-energy ball milling pre-reaction; S3, after the high-energy ball milling is finished, separating the product in the S3, transferring the product into deionized water for dispersion, and then carrying out a low-temperature hydrothermal reaction; and S4, after the low-temperature hydrothermal reaction is finished, separating a product in the S4, performing grinding by an agate mortar, and performing calcining.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium ion batteries, and in particular relates to a preparation method and application of a lithium iron manganese phosphate positive electrode material. Background technique [0002] Lithium-ion batteries are a new generation of green high-energy batteries, which have many advantages such as high voltage, high energy density, good cycle performance, small self-discharge, no memory effect, and wide operating temperature range. They are widely used in mobile phones, notebook computers, and digital cameras. , camcorders, electronic instruments, etc., also have bright application prospects in UPS, electric tools, electric bicycles, electric vehicles, energy storage batteries and other fields. In recent years, the output of lithium-ion batteries has grown rapidly, and the application fields have continued to expand. It has become a high-tech product that is of great signific...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/485H01M10/0525C01B25/26C01B25/45C01B25/37
CPCC01B25/26C01B25/375C01B25/45H01M4/485H01M4/5825H01M10/0525Y02E60/10
Inventor 王子韩刘风光张亮
Owner 王子韩
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