Process for producing homodisperse spherical iron lithium phosphate

A lithium iron phosphate, spherical technology, applied in the field of high-density spherical lithium iron phosphate preparation, can solve the problems of complex preparation process of spherical lithium iron phosphate, slightly poor electrochemical performance, high process control requirements, etc., and achieves low cost of raw materials, vibration and vibration. The effect of high solid density and simple process control

Inactive Publication Date: 2009-08-19
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Application Information

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Problems solved by technology

[0008] However, the preparation method of spherical lithium iron phosphate reported so far is slightly complicated in the preparation process. For example, the liquid phase preparation method generally needs to control the flow rate of the reaction liquid or add a precipitating agent (complexing agent), etc., and the process control requirements are relatively high.
The preparation of spherical lithium iron phosphate by solid phase method generally needs to add a crystal nucleus growth agent, and the electrochemical performance of the product is slightly poor

Method used

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  • Process for producing homodisperse spherical iron lithium phosphate
  • Process for producing homodisperse spherical iron lithium phosphate
  • Process for producing homodisperse spherical iron lithium phosphate

Examples

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Embodiment 1

[0036] Weigh 4.0544g of ferric chloride, add 300ml of distilled water to obtain iron source solution. Measure 2.153ml of phosphoric acid, weigh 2.1061g of sodium dihydrogen phosphate, and add 300ml of distilled water to obtain a 0.15 mol / L phosphorus source solution. The pH of the phosphorus source solution was adjusted to 1.5 with hydrochloric acid. Slowly add the iron source solution into the phosphorus source solution, and keep stirring to obtain a reaction solution, and keep stirring for one hour. The reaction solution was placed in an airtight container, then placed in a thermostat at 35° C., kept warm for 48 hours, and taken out to obtain a precipitate. The precipitate is separated, washed and dried to obtain uniformly dispersed spherical iron phosphate. Weigh 1.8682g iron phosphate, 0.7389g lithium carbonate, and 2% acetylene black, mix them and mill them in a ball mill for 2 hours. The mixed powder was transferred to a quartz boat, then placed in a tube furnace, und...

Embodiment 2

[0041] Weigh 27.0290 g of ferric trichloride and add 200 ml of distilled water to obtain an iron source solution. Measure 14.35ml of phosphoric acid, weigh 14.0409g of sodium dihydrogen phosphate, and add 200ml of distilled water to obtain a 1.5 mol / L phosphorus source solution. The pH of the phosphorus source solution was adjusted to 1.8 with hydrochloric acid. Slowly add the iron source solution into the phosphorus source solution, and keep stirring to obtain a reaction solution, and keep stirring for one hour. The reaction solution was placed in an airtight container, and then placed in a thermostat at 90° C., kept warm for 30 minutes, and then taken out to obtain a precipitate. The precipitate is separated, washed and dried to obtain uniformly dispersed spherical iron phosphate. Weigh 9.3410g iron phosphate, 2.0980g lithium hydroxide (LiOH H 2 O), 0.8764g glucose, 1.4245g magnesium nitrate (Mg(NO 3 ) 2 ·H 2 O), after mixing, ball milled for 5 hours in a ball mill. T...

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Abstract

The invention relates to a method for preparing uniformly dispersed spherical lithium iron phosphate-an anode material for a lithium ion battery, and belongs to the field of green energy materials. The method comprises the following steps: firstly, preparing a spherical iron phosphate precursor through liquid-phase homogeneous precipitation; secondly, performing predecomposition on the spherical iron phosphate precursor at a temperature of between 350 and 450 DEG C for 2 to 8 hours under the protection of inert gas; and thirdly, performing reaction at the temperature of between 550 and 800 DEG C for 2 to 24 hours to obtain the uniformly dispersed spherical lithium iron phosphate. The particle diameter of the product is between 100 and 200 nanometers, the tap density is between 1.6 and 2.0 g/cm, and the specific capacity of initial discharge at the room temperature reaches 140 to 160 mAh/g. The method utilizes a liquid-phase spheroidization process to prepare the uniformly dispersed spherical lithium iron phosphate, has simple process, and is easy to realize industrialized production.

Description

technical field [0001] The invention belongs to the field of green energy materials. In particular, it relates to a method for preparing high-density spherical lithium iron phosphate used as a positive electrode material for lithium ion batteries. Background technique [0002] Lithium-ion battery is a kind of green high-energy battery, which has the advantages of high voltage, high energy density, good cycle performance, and wide operating temperature range. It has been widely used in notebook computers, mobile phones, electronic instruments, portable electric tools and other equipment. , It also has a good application prospect in electric vehicles and hybrid vehicles. As a green high-energy battery, lithium-ion batteries have important research value and good application prospects under the situation of increasingly expensive fossil energy and increasingly serious environmental pollution. [0003] Cathode materials are an important part of lithium-ion batteries, commonly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45H01M4/58
CPCY02E60/12Y02E60/10
Inventor 吴锋王峰吴川白莹陈实吴伯荣
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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