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Spherical LiFexMnyPO4 anode material and preparation method thereof

A technology of lithium iron manganese phosphate and positive electrode materials, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of poor safety, high toxicity, and poor rate performance of lithium iron phosphate lithium manganese oxide. The preparation method is simple, the process is easy to control, and the particle size distribution is uniform

Inactive Publication Date: 2016-04-20
SHANDONG GOLDENCELL ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lithium cobalt oxide is expensive and highly toxic, lithium manganese oxide has poor thermal stability, lithium iron phosphate rate performance is poor, and nickel-cobalt lithium manganese oxide has poor safety, which limits the application of these materials in lithium-ion batteries.

Method used

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  • Spherical LiFexMnyPO4 anode material and preparation method thereof
  • Spherical LiFexMnyPO4 anode material and preparation method thereof

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preparation example Construction

[0028] A method for preparing a spherical lithium iron manganese phosphate positive electrode material, characterized in that the preparation process comprises the following steps:

[0029] 1) Weigh the lithium source, iron source, manganese source, and phosphorus source into the deionization solution, and ultrasonically disperse to obtain solution I, in which the molar ratio of lithium source, iron source, manganese source, and phosphorus source is 1.0~1.2:x:y :1.0~1.5, x+y=1;

[0030] 2) Add 5wt%~15wt% carbon source compound into solution I, and stir evenly to form solution II;

[0031] 3) Add surfactant CTAB to solution II, stir for 0.5h to obtain solution III, wherein the molar ratio of CTAB to lithium source is 0.05~0.2:1;

[0032] 4) Add EDTA to solution Ⅲ and stir for 0.5h to obtain solution Ⅳ, in which the molar ratio of EDTA to lithium source is 0.2~1:1;

[0033] 5) Transfer solution IV into a high-pressure reactor, and conduct hydrothermal reaction at 180°C for 6-1...

Embodiment 1

[0039] First, weigh lithium hydroxide, ferrous sulfate, manganese acetate, and phosphoric acid with a molar ratio of 1.0~1.2:0.5:0.5:1.0~1.5 and add them to deionization, ultrasonically disperse, and then add glucose with a mass fraction of metal salt of 10wt% After ultrasonic dispersion, stir for a period of time until it is completely dissolved, then add a certain amount (n(CTAB):n(LiOH)=0.05:1) of surfactant CTAB, stir for 0.5h until CTAB is completely dissolved, and then add a certain amount (n(LiOH)=0.05:1) (EDTA):n(LiOH)=0.2:1) of EDTA, stirred for 0.5h to obtain a stable and uniform solution. The solution was transferred into a high-pressure reactor, and a hydrothermal reaction was carried out at 180° C. for 6 hours. After the solution was cooled, it was filtered, washed, and dried to obtain a lithium iron manganese phosphate precursor. Put the lithium iron manganese phosphate precursor powder into a tubular calciner, calcinate at 800° C. for 8 hours in a nitrogen atmos...

Embodiment 2

[0042] First, weigh lithium hydroxide, ferrous sulfate, manganese acetate, and phosphoric acid with a molar ratio of 1.0~1.2:0.6:0.4:1.0~1.5 and add them to deionization, ultrasonically disperse, and then add glucose with a mass fraction of metal salt of 10wt% After ultrasonic dispersion, stir for a period of time until completely dissolved, then add a certain amount (n(CTAB):n(LiOH)=0.1:1) of surfactant CTAB, stir for 0.5h until CTAB is completely dissolved, then add a certain amount (n (EDTA):n(LiOH)=0.5:1) of EDTA, stirred for 0.5h to obtain a stable and uniform solution. The solution was transferred into a high-pressure reactor, and a hydrothermal reaction was carried out at 180° C. for 8 hours. After the solution was cooled, it was filtered, washed, and dried to obtain a lithium iron manganese phosphate precursor. The precursor powder of lithium iron manganese phosphate was put into a tubular calciner, calcined at 600° C. for 10 h in a nitrogen atmosphere, and ground afte...

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Abstract

The invention discloses a spherical LiFexMnyPO4 anode material. A formula of the LiFexMnyPO4 anode material is LiFexMnyPO4, wherein x+y=1. A preparation method of the LiFexMnyPO4 anode material comprises the following preparation steps: (1) weighing an Li source, an Fe source, an Mn source and a P source, and adding into deionized water, wherein a mole ratio of the Li source, the Fe source, the Mn source and the P source is (1.0 to 1.2):x:y:(1.0 to 1.5), and x+y=1; (2) adding a carbon source compound in a solution I, and uniformly stirring to form a solution II; (3) adding a surfactant in the solution II, and stirring to obtain a solution III; (4) adding EDTA (Ethylene Diamine Tetraacetic Acid) in the solution III, and stirring to obtain a solution IV; (5) putting the solution IV in a high-pressure reaction kettle, and carrying out a hydrothermal reaction under 180 DEG C to obtain a solution V; (6) obtaining an LiFexMnyPO4 precursor after cooling the solution V; (7) putting LiFexMnyPO4 precursor powder in a tubular calcining furnace, and obtaining a carbon-coated spherical LiFexMnyPO4 anode material through grinding after cooling.

Description

technical field [0001] The invention relates to a lithium ion battery cathode material and a preparation method thereof, in particular to a spherical lithium iron manganese phosphate cathode material and a preparation method thereof. Background technique [0002] With the strengthening of people's awareness of environmental protection, the environmental pollution and global warming caused by automobile exhaust have attracted widespread attention. The energy crisis brought about by the world, the research, development and industrialization of energy-saving and environmentally friendly electric vehicles have become a concern of the world. However, the biggest bottleneck restricting the development of electric vehicles is the safety and life of power batteries. Lithium-ion batteries are recognized as the power source of electric vehicles due to their high energy, high power, long life, good safety, small self-discharge, and environmental friendliness. [0003] Lithium-ion bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/0525
CPCH01M4/5825H01M10/0525Y02E60/10
Inventor 关成善宗继月张敬捧邵长旺
Owner SHANDONG GOLDENCELL ELECTRONICS TECH
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