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Preparation method of lithium iron phosphate positive electrode material, positive electrode material and battery

A technology for lithium iron phosphate and positive electrode materials, applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve the problems of limited raw material sources and high production costs, achieve uniform coating effect, improve conductivity, and save costs Effect

Active Publication Date: 2021-02-09
湖南桑瑞新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the disclosed scheme of this method improves the electrical properties of the lithium iron phosphate cathode material through multi-layer coating, the source of raw materials involved in the scheme is limited, the analysis of pure grade is required, and the production cost is still relatively high.

Method used

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  • Preparation method of lithium iron phosphate positive electrode material, positive electrode material and battery
  • Preparation method of lithium iron phosphate positive electrode material, positive electrode material and battery
  • Preparation method of lithium iron phosphate positive electrode material, positive electrode material and battery

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preparation example Construction

[0062] The invention provides a method for preparing a lithium iron phosphate positive electrode material. The preparation method is a method for preparing a lithium iron phosphate positive electrode material with nano-zinc oxide and graphene double coating layers sequentially from the inside to the outside by comprehensively utilizing blast furnace ash. The method specifically includes the following steps:

[0063] (1) Concentrate and tailings are obtained by crushing, screening and flotation of blast furnace ash; the concentrate produced by flotation is carbon powder, and the tailings are the part mainly containing iron and zinc elements.

[0064] (2) Activated carbon powder is obtained: the concentrate obtained in step (1) is treated with an active agent to obtain activated carbon powder; specifically, the following method is adopted: the concentrate obtained by step (1) flotation is immersed in the active agent Stir for 60-120 minutes, the mass ratio of active agent to con...

Embodiment 1

[0083] This embodiment provides a method for preparing a lithium iron phosphate positive electrode material, comprising the following steps:

[0084] (1) The crushed and screened blast furnace ash is directly subjected to flotation to obtain concentrates and tailings; the concentrates obtained from flotation are carbon powder, and the tailings mainly contain iron and zinc elements.

[0085] (2) Preparation of activated carbon powder: Stir the flotation concentrate and phosphoric acid for 60 minutes according to the mass ratio of 1:1, after filtering, heat in a vacuum oven at 400°C for 60 minutes, then wash and dry with deionized water, that is Get activated carbon powder.

[0086] (3) Zinc metal vapor and iron-containing raw materials are obtained: the tailings floated out in step (1) and the active carbon powder of step (2) are mixed in a mass ratio of 1:0.5, placed in a tube furnace, Reduction at 800°C for 60 minutes in an argon atmosphere, collecting the reduced zinc metal...

Embodiment 2

[0092] This embodiment provides a method for preparing a lithium iron phosphate positive electrode material, comprising the following steps:

[0093] (1) The crushed and screened blast furnace ash is directly subjected to flotation to obtain concentrates and tailings; the concentrates obtained from flotation are carbon powder, and the tailings mainly contain iron and zinc elements.

[0094] (2) Preparation of activated carbon powder: Stir the flotation concentrate and phosphoric acid for 100 minutes according to the mass ratio of 1:2, filter, heat in a vacuum oven at 450°C for 70 minutes, and then wash and dry with deionized water, that is Get activated carbon powder.

[0095] (3) Zinc metal vapor and iron-containing raw materials are obtained: the tailings in the step (1) and the active carbon powder of the step (2) are mixed in a mass ratio of 1:0.8, placed in a tube furnace, Reduction at 900°C for 100 min in an argon atmosphere, the reduced zinc metal vapor was collected, ...

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Abstract

The invention provides a preparation method of a lithium iron phosphate positive electrode material, the positive electrode material and a battery. The preparation method is a method for preparing thelithium iron phosphate positive electrode material with a nanometer zinc oxide coating layer and a graphene coating layer by comprehensively utilizing blast furnace ash. The preparation method specifically comprises the following steps: carrying out flotation on the blast furnace ash to obtain concentrates and tailings; performing active treatment on the concentrate to obtain active carbon powder; treating the tailings to obtain zinc metal steam and an iron-containing raw material; preparing carbon doped lithium iron phosphate; introducing hot air and the zinc metal steam at a high temperature for zinc oxide vapor deposition coating; and with zinc oxide as a substrate, cracking active carbon powder into carbon atoms at a high temperature, wherein the carbon atoms are adsorbed on the surface of zinc oxide to form a graphene coating layer. According to the method, zinc, carbon and iron contained in the blast furnace ash can be recycled to prepare the lithium iron phosphate positive electrode material; compared with a traditional preparation method using analytically pure raw materials, the production cost of the method of the invention can be greatly reduced; and meanwhile, the prepared material has double coating layers, namely the zinc oxide coating layer and the graphene coating layer, so coating is more uniform, and the electrochemical performance of the material is more excellent.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery positive electrode materials, in particular to a preparation method of lithium iron phosphate positive electrode material, positive electrode material and battery. Background technique [0002] As a lithium battery cathode material with an olivine structure, lithium iron phosphate has the advantages of wide source of raw materials, environmental friendliness, and low price. In addition, because of its high safety performance and long cycle life, it is widely used in medium and large energy storage batteries, electric tools, electric vehicles and other fields. Lithium iron phosphate synthesis methods mainly include high-temperature solid-phase method, hydrothermal method, and sol-gel method. No matter which method is used, the sources of raw materials for synthesis are relatively limited, and generally require analytically pure grades, resulting in relatively high production costs. Hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45C01B32/184C01G9/03H01M4/58H01M4/62H01M10/0525H01M10/058
CPCC01B25/45C01G9/03C01B32/184H01M4/5825H01M4/62H01M4/625H01M10/058H01M10/0525C01P2004/03C01P2004/04Y02E60/10Y02P70/50
Inventor 赵栋邓多唐泽勋商士波
Owner 湖南桑瑞新材料有限公司
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