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Preparation method of composite multi-element lithium iron manganese vanadium phosphate positive electrode material

A technology of iron manganese vanadium lithium phosphate and positive electrode material, which is applied in positive electrodes, electrical components, battery electrodes, etc., can solve the problems of difficult industrial production, high cost, and complexity.

Inactive Publication Date: 2021-07-06
天津斯科兰德科技有限公司
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  • Description
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Problems solved by technology

Chinese Patent Publication No. CN105129758A discloses a porous lithium manganese vanadium phosphate positive electrode material. The manganese vanadium lithium phosphate composite positive electrode material not only combines the advantages of lithium vanadium phosphate and lithium manganese phosphate, but also has excellent properties due to the interdoping of manganese and vanadium elements rate performance, but its cycle performance at high rates still needs to be improved. The capacity retention rate of the positive electrode material prepared by this invention is only 93.98% after 50 cycles at 5C rate
However, the current mixed preparation process of multiple materials is relatively complicated and costly, making it difficult to apply to industrial production on a large scale.

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  • Preparation method of composite multi-element lithium iron manganese vanadium phosphate positive electrode material
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  • Preparation method of composite multi-element lithium iron manganese vanadium phosphate positive electrode material

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preparation example Construction

[0025] An embodiment of the present invention provides a method for preparing a composite multi-element lithium iron manganese vanadium phosphate positive electrode material, comprising the following steps:

[0026] 1) mixing lithium source, iron source, manganese source, vanadium source, phosphorus source and carbon source in a certain proportion, fully grinding and refining in a grinder to obtain slurry a;

[0027] 2) drying the above slurry a in a microwave oven for a certain period of time, cooling to room temperature and taking it out to obtain the precursor b;

[0028] 3) The above precursor b is added to an atmosphere sintering furnace for high temperature sintering for a certain period of time, and after cooling to room temperature, a positive electrode material of iron manganese vanadium lithium phosphate is obtained.

[0029]In the step 1), the molar ratio of lithium source, iron source, manganese source, vanadium source and phosphorus source is (1-1.07): (0.1-0.34):...

Embodiment 1

[0039] Weigh ferric oxide 31.938g (0.2mol), manganese trioxide 47.34g (0.3mol), vanadium pentoxide 181.88h (1mol), lithium dihydrogen phosphate 415.66g (4mol), lithium carbonate 20.69g (0.28 mol), glucose 62.72g. Add the weighed lithium dihydrogen phosphate, lithium carbonate and glucose into 760ml of deionized water, stir until no bubbles are generated, then add other raw materials such as ferric oxide, manganese trioxide and vanadium pentoxide, and then pour into Grinding machine for 2h. The undersize was collected by sieving to obtain a mixed slurry L1, and the slurry L1 was dried in a microwave oven at 300° C. for 3 hours to obtain a precursor q1. The precursor was sintered in a sintering furnace at 750°C for 5h, and after cooling down to room temperature, lithium iron manganese vanadium phosphate (0.5LiMn 0.6 Fe 0.4 PO 4 0.5Li 3 V 2 (PO 4 ) 3 ) positive electrode material.

Embodiment 2

[0041] Weigh 47.91g (0.3mol) of ferric oxide, 47.34g (0.3mol) of manganese trioxide, 145.51g (0.8mol) of vanadium pentoxide, 374.09g (3.6mol) of lithium dihydrogen phosphate, and 18.47g of lithium carbonate (0.25mol), glucose 57.26. Add the weighed lithium dihydrogen phosphate, lithium carbonate and glucose into 694ml of deionized water, stir evenly until no bubbles are generated, then add other raw materials such as ferric oxide, manganese trioxide and vanadium pentoxide, and then pour into Grinding machine for 2h. The undersize was collected by sieving to obtain the mixed slurry L2, and the slurry L2 was dried in a microwave oven at 300°C for 3 hours to obtain the precursor q2. The precursor was sintered in a sintering furnace at 750 °C for 5 h, and after cooling down to room temperature, lithium iron manganese vanadium phosphate (0.6LiMn 0.5 Fe 0.5 PO 4 0.4 Li 3 V 2 (PO 4 ) 3 ) positive electrode material.

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Abstract

The invention discloses a preparation method of a composite multi-element lithium iron manganese vanadium phosphate positive electrode material. The method comprises the following steps: 1) mixing a lithium source, an iron source, a manganese source, a vanadium source, a phosphorus source and a carbon source according to a certain proportion, and fully grinding and refining in a grinding machine to obtain slurry a; 2) carrying out microwave drying on the slurry a in a microwave oven for a certain time, cooling to room temperature, and taking out to obtain a precursor b; and 3) adding the precursor b into an atmosphere sintering furnace for high-temperature sintering for a certain time, and cooling to room temperature to obtain the lithium ferric manganese vanadium phosphate positive electrode material. The method is easy to operate, high in controllability and suitable for industrial mass production, and the lithium ion battery positive electrode material with multiple advantages is synthesized at low cost.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a composite multi-component iron manganese vanadium lithium positive electrode material. Background technique [0002] Since Goodenough discovered the olivine-structured lithium iron phosphate material in 1997, phosphate cathode materials have received extensive attention from the lithium-ion battery industry. Due to their unique characteristics, various phosphate cathode materials have been fully applied through compounding and some other modification methods. [0003] Lithium iron phosphate has a stable olivine structure, good safety performance, excellent cycle performance, environmental friendliness, rich resources and other advantages, so it has been widely used; but the defects of lithium iron phosphate can not be ignored, such as: lithium ion conduction Low efficiency, low working voltage, low energy density, etc. Lithium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/58H01M10/0525
CPCH01M4/5825H01M4/625H01M10/0525H01M2004/028Y02E60/10
Inventor 李积刚
Owner 天津斯科兰德科技有限公司
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