Making method of lithium iron phosphate compound anode material of lithium battery

A technology of lithium iron phosphate and composite materials, which is applied in the direction of electrode manufacturing, battery electrodes, phosphorus compounds, etc., can solve the problems of unfavorable industrial production, inability to mix materials, poor product performance, etc., and achieve high utilization rate of raw materials and short reaction cycle , the effect of uniform distribution of elements

Inactive Publication Date: 2008-01-09
北京中润恒动电池有限公司
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Problems solved by technology

[0007] The traditional method of preparing the cathode material lithium iron phosphate precursor generally uses its oxide or the corresponding metal compound as the initial raw material for the reaction, which causes a waste of elements, and a large amount of gas released during the sintering process also has a negative impact on the ecological environment. Adverse effects, at the same time, the traditional mechanical mixing method cannot fully mix the materials, and there are many related processes, which are extremely cumbersome; because the materials in the early stage are not uniformly mixed, resulting in poor product performance; and the sol-gel method, a total of Precipitation method, microwave method, etc. are not conducive to industrial production because of their raw materials, equipment and related operability, and only stay in the laboratory research stage

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  • Making method of lithium iron phosphate compound anode material of lithium battery
  • Making method of lithium iron phosphate compound anode material of lithium battery
  • Making method of lithium iron phosphate compound anode material of lithium battery

Examples

Experimental program
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Effect test

Embodiment 1

[0045] Get 0.9mol (50.4g) metallic iron (purity 99.8%) and put it in metal titanium blue as anode, graphite plate as cathode, with 34.74g lithium phosphate (0.3mol / L) and 42.57g phosphorus pentoxide (0.3mol / L) L) Dissolved in 1000ml of absolute ethanol as the electrolyte, the distance between the electrodes is 35mm, the electrolytic terminal voltage is 5V, and the current density is controlled at 600A / m 2 . After electrolysis, the electrolysis product was dried in a vacuum oven at 120° C. for 12 hours to obtain 142.1 g of dry powder precursor. Mix the powdery precursor with 1g of sucrose, then place it in a tube furnace, use nitrogen as a protective atmosphere, nitrogen flow rate 6L / min, raise the furnace temperature to 650 degrees at a heating rate of 5°C / min, and then After sintering for 24 hours, after cooling to room temperature, the product was ground through a 400-mesh sieve to obtain the lithium iron phosphate composite material LiFePO 4 / C, its carbon content is abou...

Embodiment 2

[0047] Get 0.36mol (20.16g) metal iron (purity 99.8%), and 0.54mol metal manganese (29.65g, purity 99.8%) are placed in metal titanium blue as anode, graphite plate is done cathode, with 34.74g lithium phosphate (0.3mol / L) and 42.57g of phosphorus pentoxide (0.3mol / L) were dissolved in 1000ml of absolute ethanol as the electrolyte, the distance between the electrodes was 35mm, the electrolytic terminal voltage was 5V, and the current density was controlled at 600A / m 2 , after electrolysis, the electrolysis product was placed in a vacuum oven and dried at 120° C. for 12 hours to obtain 141.6 g of dry powder precursor. Then the obtained powdery precursor was mixed with 1 g of sucrose, and the above-mentioned mixed material was placed in a tube furnace, and nitrogen was used as a protective atmosphere. The nitrogen flow rate was 6 L / min, and the furnace temperature was raised to 650 °C at a heating rate of 5 ° C / min. degree, and then sintered at 650 degree for 24h, after cooli...

Embodiment 3

[0049] Get 0.72mol (40.32g) metal iron (purity 99.8%), 0.18mol metal nickel (52.83g, purity 99.8%) and put it in metal titanium blue as anode, graphite plate as cathode, with 34.74g lithium phosphate (0.3mol / L) and .42.57g of phosphorus pentoxide (0.3mol / L) were dissolved in 1200ml of absolute ethanol as the electrolyte, the distance between the electrodes was 35mm, the electrolytic terminal voltage was 5V, and the current density was controlled at 600A / m 2 . After electrolysis, the electrolysis product was dried in a vacuum oven at 120° C. for 12 hours to obtain 142.5 g of dry powder precursor. Mix the powdery precursor with 1g of sucrose, then place it in a tube furnace, use nitrogen as a protective atmosphere, nitrogen flow rate 6L / min, raise the furnace temperature to 650 degrees at a heating rate of 5°C / min, and then After sintering for 24 hours, after cooling to room temperature, the product was ground through a 400-mesh sieve to obtain the lithium iron phosphate compo...

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Abstract

The invention is concerned with the making method of the LiFe1-xMxPO4 compound material. It is to generate the sol usher of the anode material by electrolytic, and to dry the sol under 80 deg.C to 400 deg.C vacuum environment for obtaining the usher in power form, and to conduct carbon mixing, calcinations and grinding. The advantages of the compound material are: high accumulation consistency, volume specific capacity, right electrochemistry and with no thrill gas releasing during sintering that is very environmental friendly.

Description

technical field [0001] The invention relates to a method for preparing a positive electrode material of a lithium ion battery, in particular to a method for preparing a lithium iron phosphate composite material precursor by using an electrolysis process, and belongs to the technical field of battery material preparation. Background technique [0002] As a green high-energy battery, lithium-ion batteries have many advantages such as high voltage, high energy density, good cycle performance, small self-discharge, no memory effect, and wide operating temperature range. They are widely used in mobile phones, notebook computers, digital cameras and other large In terms of emerging IT products, in addition, large batteries such as electric vehicles, electric tools, automotive 42V batteries, and photovoltaic energy storage batteries have begun to gradually replace traditional lead-acid batteries. The most important part of the materials used in the production of lithium-ion batteri...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/48H01M4/04C01B25/45
CPCY02E60/12Y02E60/10
Inventor 刘立君蒋华锋韩磊周焕升
Owner 北京中润恒动电池有限公司
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