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Lithium manganese phosphate positive electrode material for lithium ion power battery and preparation method thereof

A technology for lithium manganese phosphate and power batteries, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve problems affecting the electrical properties of lithium manganese phosphate products, suppress side reactions, change the Fermi energy level, and improve electronic conductivity sexual effect

Active Publication Date: 2018-06-19
TIANJIN B&M SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mixing process of the high-temperature solid-phase method mainly includes two methods: dry mixing and wet mixing. The dispersant for wet mixing includes polar dispersants such as deionized water and ethanol, and non-polar dispersants such as cyclohexane and n-hexane. Manganese salts will react complexly with the added phosphate and lithium salts in the polar dispersant, seriously affecting the electrical properties of the final prepared lithium manganese phosphate product

Method used

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  • Lithium manganese phosphate positive electrode material for lithium ion power battery and preparation method thereof
  • Lithium manganese phosphate positive electrode material for lithium ion power battery and preparation method thereof
  • Lithium manganese phosphate positive electrode material for lithium ion power battery and preparation method thereof

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Embodiment 1

[0028] Such as figure 1 Shown, the preparation method of lithium manganese phosphate lithium positive electrode material for lithium ion power battery of the present invention specifically comprises the steps:

[0029] 1) According to the chemical formula Li 1.02 mn 0.94 Fe 0.05 Ti 0.01 (PO 4 ) 0.99 f 0.01 Weigh lithium carbonate, manganese carbonate, ferrous oxide, titanium dioxide, ammonium dihydrogen phosphate, lithium fluoride, according to the quality of n-hexane: (lithium carbonate + manganese carbonate + ferrous oxide + titanium dioxide + ammonium dihydrogen phosphate + lithium fluoride) Mass=3.0:1 Weigh n-hexane, and weigh ECP600JD according to the carbon content of the final product at 3%;

[0030] 2) Add the above-mentioned substances to a sand mill for sand grinding, and the particle size of the slurry after sand grinding is D 50 = 0.22 μm;

[0031] 3) The above slurry is spray-dried in a nitrogen-protected closed spray dryer, the inlet temperature is 180°C...

Embodiment 2

[0042] A kind of preparation method of manganese phosphate lithium cathode material for lithium-ion power battery, specifically comprises the following steps:

[0043] 1) According to the chemical formula Li 1.05 mn 0.87 Fe 0.1 Ti 0.03 (PO 4 ) 0.98 f 0.02 Weigh lithium hydroxide, manganese carbonate, ferric oxide, titanium dioxide, ammonium dihydrogen phosphate, boron trifluoride, according to the quality of n-hexane: (lithium hydroxide + manganese carbonate + ferric oxide + titanium dioxide + ammonium dihydrogen phosphate + boron trifluoride) mass = 4.0:1 Weigh n-hexane, and weigh ECP600JD according to the carbon content of the final product at 5%;

[0044] 2) Add the above-mentioned substances to a sand mill for sand grinding, and the particle size after sand grinding is D 50 = 0.20 μm;

[0045] 3) The above slurry is spray-dried in a nitrogen-protected closed spray dryer with an inlet temperature of 220°C and an outlet temperature of 100°C;

[0046] 4) Airflow pulv...

Embodiment 3

[0058] A kind of preparation method of manganese phosphate lithium cathode material for lithium-ion power battery, specifically comprises the following steps:

[0059] 1) According to the chemical formula Li 1.08 mn 0.87 Fe 0.1 Ti 0.03 (PO 4 ) 0.99 f 0.01 Weigh lithium acetate, manganese carbonate, ferric oxide, titanium dioxide, lithium dihydrogen phosphate, lithium fluoride, according to the mass of cyclohexane: (lithium carbonate+manganese carbonate+ferric oxide+titanium dioxide+lithium dihydrogen phosphate+fluorine Lithium chloride) quality=4.0:1 takes by weighing cyclohexane, takes by weighing ECP600JD according to 5% of final product carbon content;

[0060] 2) Add the above-mentioned substances to a sand mill for sand grinding, and the particle size after sand grinding is D 50 = 0.21 μm;

[0061] 3) The above slurry is spray-dried in a nitrogen-protected closed spray dryer with an inlet temperature of 220°C and an outlet temperature of 100°C;

[0062] 4) Airflo...

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Abstract

The invention discloses a lithium-manganese-phosphate anode material for a lithium-ion power battery and a preparing method thereof. According to the preparing method, due to nonpolar organic dispersing agents, the side reaction of manganese salt is fundamentally inhibited; due to the secondary sanding technology, the secondary spray drying technology and the secondary roasting control crystallization technology, primary-particle-nano-crystallization, secondary-particle-micro-crystallization and carbon-even-coating lithium-manganese-phosphate materials are obtained; due to the iron, titanium and fluorine zwitterion crystal structure perturbation modification technology, lattice defects are generated, the Fermi level of the material is changed, and electronic conductivity is improved; lithium conduction channels are expanded by limiting the chaotic order of a region structure, and the dynamic performance of the material is remarkably improved. The lithium-manganese-phosphate anode material prepared with the method is free of mixed phases and excellent in performance, and has good application prospects.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium ion secondary batteries, in particular to a lithium manganese phosphate positive electrode material for lithium ion power batteries and a preparation method thereof. Background technique [0002] Lithium-ion battery is a secondary battery with high energy density, high power density and long life, which plays an important role in modern society. Lithium-ion batteries are widely used in small devices such as mobile phones and notebook computers. At the same time, with the rapid development of industries such as electric vehicles and smart grids, the demand for lithium-ion power batteries has risen sharply, and the performance requirements for them are increasing. The cathode material used in lithium-ion batteries is the decisive factor for its performance and cost. As a cathode material for lithium-ion batteries, lithium manganese phosphate has the advantages of high workin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M4/136H01M4/1397H01M10/0525
CPCH01M4/136H01M4/1397H01M4/362H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 徐宁宋英杰伏萍萍吴孟涛
Owner TIANJIN B&M SCI & TECH
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