Preparation method of lithium manganese iron phosphate positive electrode material

A technology of lithium iron manganese phosphate and manganese phosphate is applied in the field of positive electrode materials of lithium ion batteries to achieve the effects of good electrical performance, high voltage platform and excellent cycle performance

Pending Publication Date: 2022-01-14
HUBEI WANRUN NEW ENERGY TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing lithium manganese phosphate cathode material in order to solve the problems of conductivity and capacity of lithium manganese iron phosphate

Method used

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  • Preparation method of lithium manganese iron phosphate positive electrode material
  • Preparation method of lithium manganese iron phosphate positive electrode material
  • Preparation method of lithium manganese iron phosphate positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A preparation method for lithium manganese iron phosphate, which comprises the following steps:

[0032] First add 100 g of pure water to the ball mill, weigh 10.8 g of ammonium dihydrogen phosphate, and then slowly add 4.98 g of lithium carbonate, the reaction between ammonium dihydrogen phosphate and lithium carbonate will produce a lot of bubbles, wait until the reaction is complete without bubbles After generation, add 6 g of anhydrous iron phosphate, 4.8 g of polyethylene glycol, 0.08 g of titanium dioxide, 0.1 g of ammonium metavanadate, 6.9 g of trimanganese tetraoxide, and 0.15 g of titanate coupling agent, ball milled for 1 h, and then transferred to sand mill, the final particle size of sand mill D50 is 236 nm, so that the raw materials such as iron source, lithium source, manganese source, phosphorus source, carbon source, metal ion dopant and so on are fully mixed evenly, Then granulate by spray drying to obtain brown precursor powder. The precursor was pac...

Embodiment 2

[0034] A preparation method for lithium manganese iron phosphate, which comprises the following steps:

[0035] First add 100 g of pure water to the ball mill, weigh 12.2 g of diammonium hydrogen phosphate, and then slowly add 4.98 g of lithium carbonate, the reaction between ammonium dihydrogen phosphate and lithium carbonate will produce a lot of bubbles, wait until the reaction is complete without bubbles After production, add 6 g of anhydrous iron phosphate, 4.8 g of polyethylene glycol, 0.1 g of titanium dioxide, 6.9 g of trimanganese tetraoxide, 0.15 g of titanate coupling agent, ball mill for 1 hour, and then transfer to Sand milling, the final particle size of sand milling D50 is 263 nm, fully mix the raw materials such as iron source, lithium source, manganese source, phosphorus source, carbon source, metal ion dopant, etc., and then use spray drying to granulate to obtain brown precursor powder. The precursor was packed in a graphite sagger and sintered at a high te...

Embodiment 3

[0037] A preparation method for lithium manganese iron phosphate, which comprises the following steps:

[0038] First add 100 g of pure water to the ball mill, weigh 7.1 g of diammonium hydrogen phosphate, and then slowly add 3.3 g of lithium carbonate, the reaction between ammonium dihydrogen phosphate and lithium carbonate will produce a lot of bubbles, wait until the reaction is complete without bubbles After production, add 4 g of anhydrous iron phosphate, 0.4 g of polyethylene glycol, 1.4 g of glucose, 0.03 g of titanium dioxide, 16.3 g of manganese acetate tetrahydrate, 0.2 g of titanate coupling agent, and ball mill 1 h, then transfer to sand mill, the final particle size of sand mill D50 is 245nm, fully mix raw materials such as iron source, lithium source, manganese source, phosphorus source, carbon source, metal ion dopant, and then spray dry Granulate to obtain brown precursor powder. The precursor was packed in a graphite sagger and sintered at a high temperature ...

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Abstract

The invention discloses a method for preparing lithium manganese iron phosphate by a solid phase method. The preparation method comprises the following steps: weighing a certain amount of a manganese source and an iron source according to a molar ratio of 7:3, weighing a lithium source, a phosphorus source, a carbon source and a dopant according to a certain stoichiometric ratio, adding pure water, carrying out ball milling and sanding, controlling the sanding particle size D50 to be less than or equal to 300 nm, and carrying out spray drying to obtain brown precursor powder; and sintering the precursor under the protection of a nitrogen atmosphere, controlling the sintering temperature to be 600-700 DEG C, then performing crushing and screening, and removing iron to obtain the lithium manganese iron phosphate positive electrode material. The lithium manganese iron phosphate prepared by the method is simple in process and easy to control in process, compared with existing lithium iron phosphate and ternary materials, the lithium manganese iron phosphate is lower in cost and higher in voltage platform, and meanwhile, the obtained lithium manganese iron phosphate has good electrical performance and cycle performance.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials of lithium ion batteries, and in particular relates to a preparation method of lithium manganese iron phosphate material. Background technique [0002] At present, lithium cobalt oxide, lithium manganese oxide, ternary materials, lithium iron phosphate, etc. are widely used as positive electrode active materials for lithium ion batteries. Among them, lithium iron phosphate has attracted widespread attention due to its high theoretical capacity, good cycle performance, excellent safety performance, wide source of raw materials, low cost, and environmental friendliness. However, the lithium iron phosphate battery has the disadvantage of low voltage, its electrode voltage is 3.2 V, and the lithium iron phosphate lithium iron phosphate and lithium iron phosphate both belong to the phosphate lithium ion battery positive electrode active material, and its theoretical capacity is 170...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45C01B32/05H01M4/58H01M10/0525
CPCC01B25/45C01B32/05H01M4/5825H01M10/0525H01M2004/028C01P2002/72C01P2004/03C01P2004/62Y02E60/10
Inventor 杨娇娇王勤程国章高川赵旭余随淅
Owner HUBEI WANRUN NEW ENERGY TECH DEV
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