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Multi-ion-doped carbon-coated lithium iron phosphate battery material and preparation method thereof

A carbon-coated technology for lithium iron phosphate and battery materials, which is applied to battery electrodes, circuits, electrical components, etc. Electrical properties and other issues, to ensure uniformity, high specific capacity, and improve the effect of electronic conductivity

Inactive Publication Date: 2013-10-23
YANTAI ZHUONENG BATTERY MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned patents have carried out multi-position doping modification on lithium iron phosphate, both of them combine the dopant with the main element through simple raw material mixing, ball milling, and roasting. The uniformity of distribution in the material and its occupancy in the lithium iron phosphate lattice can easily lead to a change in the olivine crystal system structure of lithium iron phosphate, resulting in impurity phases, reducing the electrical properties of the material, but failing to achieve improvement. effect

Method used

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  • Multi-ion-doped carbon-coated lithium iron phosphate battery material and preparation method thereof
  • Multi-ion-doped carbon-coated lithium iron phosphate battery material and preparation method thereof
  • Multi-ion-doped carbon-coated lithium iron phosphate battery material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1. Weigh 259.49g FeCl 3 ·6H 2 O, 10.51g NiSO 4 ·6H 2 O was added to 20L deionized water to prepare a mixed solution A with a total metal ion concentration of 0.05mol / L; weigh 115.03g NH 4 h 2 PO 4 Add it into 0.2L deionized water to make solution B with a concentration of 5mol / L; prepare an ammonia solution with a concentration of 10mol / L; pump solution A and solution B into a rapidly stirring reaction kettle with a peristaltic pump, and control the reaction temperature to 40°C, the stirring speed is 1200rpm, adjust the pH value to 2.4 with ammonia solution, react for 0.5h, then filter the reaction liquid, wash and dry to obtain Ni-doped iron phosphate containing crystal water, expressed as Fe 0.96 Ni 0.04 PO 4 2H 2 O.

[0028] 2, the Fe obtained in step 1 0.96 Ni 0.04 PO 4 2H 2 O was heat-treated from room temperature to 300°C for 10 hours at a heating rate of 5°C / min, and then cooled naturally to obtain Ni-doped iron phosphate without crystal water, expre...

Embodiment 2

[0033] 1. Weigh 403.62g Fe(NO 3 ) 3 9H 2 O, 0.24g CoCl 2 ·6H 2 O was added to 1L deionized water to prepare a mixed solution A with a total metal ion concentration of 1mol / L; weigh 131.05g (NH 4 ) 2 HPO 4 Add it into 1L of deionized water to prepare a solution B with a concentration of 1mol / L; prepare an aqueous ammonia solution with a concentration of 8mol / L; use a peristaltic pump to pump solution A and solution B into a rapidly stirring reactor, and control the reaction temperature to 80 ℃, the stirring speed is 800rpm, adjust the pH value to 3 with ammonia solution, react for 1.5h, then filter the reaction liquid, wash and dry to obtain Co-doped iron phosphate containing crystal water, expressed as Fe 0.999 co 0.001 PO 4 2H 2 O.

[0034] 2, the Fe obtained in step 1 0.999 co 0.001 PO 4 2H 2 O was heat-treated from room temperature to 450 °C for 6 hours at a heating rate of 1 °C / min, and the temperature was naturally lowered to obtain Co-doped iron phosphate ...

Embodiment 3

[0038] 1. Weigh 264.89g FeCl 3 ·6H 2 O, 5.00g Mn(NO 3 ) 2 4H 2 O was added to 4L deionized water to prepare a mixed solution A with a total metal ion concentration of 0.25mol / L; weigh 131.05g (NH 4 ) 2 HPO 4 Add it into 2L deionized water to prepare solution B with a concentration of 0.5 mol / L; prepare an aqueous ammonia solution with a concentration of 3 mol / L; pump solution A and solution B into a rapidly stirring reactor with a peristaltic pump, and control the reaction temperature to 65°C, the stirring speed is 2500rpm, adjust the pH value to 2.7 with ammonia solution, react for 3h, then filter, wash and dry the reaction liquid to obtain Mn-doped ferric phosphate containing crystal water, expressed as Fe 0.98 mn 0.02 PO 4 2H 2 O.

[0039] 2, the Fe obtained in step 1 0.98 mn 0.02 PO 4 2H 2 O was heat-treated from room temperature to 400 °C for 10 h at a heating rate of 10 °C / min, and the temperature was naturally lowered to obtain Mn-doped iron phosphate wit...

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Abstract

The invention discloses a multi-ion-doped carbon-coated lithium iron phosphate battery material and a preparation method thereof. The material has a structure of Li1-x M'x Fe1-y My (PO4)1-zFz / C, wherein x is more than or equal to 0.001 and less than or equal to 0.1, y is more than or equal to 0.001 and less than or equal to 0.1, z is more than or equal to 0.001 and less than or equal to 0.1, M' and M are respectively metal ions doped at the lithium position and the iron position, C is organic matter pyrolysis carbon covered on the surface of lithium iron phosphate, and M' and F come from fluoride M' Fn (n is equal to 1, 2, 3 or 4). The preparation method comprises the steps of: (1) preparing doped iron phosphate containing crystal water by a coprecipitation method; (2) carrying out heat treatment on the iron phosphate containing the crystal water, and removing the crystal water; and (3) mixing the doped iron phosphate, lithium source, the fluoride M' Fn and organic carbon source, carrying out ball-milling, drying and roasting to obtain the multi-ion-doped carbon-coated lithium iron phosphate battery material. The preparation method is simple and easy in technology, and the prepared lithium iron phosphate is high in specific discharge capacity and excellent in rate capability, thus having application prospect in the field of a power battery.

Description

[0001] Technical field: [0002] The invention relates to a lithium iron phosphate battery material and a preparation method thereof, in particular to a multi-ion-doped carbon-coated lithium iron phosphate battery material and a preparation method thereof for use in the field of power lithium-ion batteries and energy storage lithium-ion batteries . Background technique: [0003] Lithium-ion batteries have the advantages of high voltage, high energy density, good cycle performance, no memory effect, environmental protection and pollution-free, and are widely used in notebook computers, mobile phones, electronic instruments, electric vehicles, electric bicycles, energy storage equipment and other fields. As an important part of lithium-ion batteries, cathode materials have become the object of research by researchers from all over the world. At present, common positive electrode materials include lithium cobalt oxide, lithium manganese oxide, nickel cobalt lithium manganese o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62
CPCY02E60/12Y02E60/10
Inventor 杨志宽刘登华
Owner YANTAI ZHUONENG BATTERY MATERIAL
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