Preparation method of positive-electrode cellular material used by lithium ion battery

A technology for lithium ion batteries and porous materials, which is applied in the field of preparation of positive electrode materials for lithium ion batteries, can solve problems such as insufficient contact of raw materials, and achieve the problem of overcoming irregular product morphology, controllable particle size and uniform particle size distribution. Effect

Inactive Publication Date: 2010-08-04
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] The invention also provides a preparation method of lithium ferrous phosphate, a positive electrode porous composite material for lithium-ion batteries. The method prepares a precursor liquid through a soft chemical method, which can achieve atomic level mixing between...

Method used

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  • Preparation method of positive-electrode cellular material used by lithium ion battery
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  • Preparation method of positive-electrode cellular material used by lithium ion battery

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Experimental program
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Effect test

Embodiment 1

[0038] Homogenization of raw materials: Weigh lithium nitrate, iron nitrate, and ammonium dihydrogen phosphate according to the molar ratio of Li:Fe:P of 1:1:1, dissolve them in water, and add carbon black according to the molar ratio of C:Fe:3:1 , Then add 5g surfactant Tween 80, make 1000mL suspension slurry (solid content 20wt%) with deionized water. After the mixture was fully stirred in a high-speed disperser for 2 hours, a well-dispersed suspension slurry was obtained as precursor liquid A.

[0039] Precursor preparation: The precursor solution A was dried and dehydrated with a centrifugal spray dryer. Under the carrier gas pressure of 0.2MPa, the slurry was added to the spray dryer at a rate of 15mL / min, and the inlet and outlet temperatures were kept at 260°C. At around and 100°C, the dried powder is collected by a cyclone separator to obtain precursor B, which is a black powder.

[0040] Heat treatment: Place this precursor B in a tube furnace, heat treat at 800°C fo...

Embodiment 2

[0043] Homogenization treatment of raw materials: Weigh lithium carbonate, iron nitrate and phosphoric acid according to Li:Fe:P molar ratio of 1:1:1, dissolve them in water, add carbon black according to C:Fe molar ratio of 2:1, and then add 5 g of surfactant Tween 80 was prepared into 1000 mL of suspension slurry (solid content 20 wt %) with deionized water. After the mixture was fully stirred in a sand mill for 2 hours, a well-dispersed suspension slurry was obtained as precursor liquid A.

[0044] Precursor preparation: The precursor solution A was dried and dehydrated with a centrifugal spray dryer. Under the carrier gas pressure of 0.2MPa, the slurry was added to the spray dryer at a rate of 15mL / min, and the inlet and outlet temperatures were kept at 260°C. At around and 100°C, the dried powder is collected by a cyclone separator to obtain precursor B, which is a black powder.

[0045] Heat treatment: Place this precursor B in a tube furnace, heat treat at 550°C for 36...

Embodiment 3

[0048] Homogenization treatment of raw materials: weigh lithium nitrate, ferric oxide and phosphoric acid according to Li:Fe:P molar ratio of 1:1:1, dissolve them in water, add acetylene black according to C:Fe molar ratio of 3:1, Then add 10 g of surfactant Tween 80, and make 1000 mL of suspension slurry (solid content 20 wt %) with deionized water. After the mixture was fully stirred in a high-speed disperser for 2 hours, a well-dispersed suspension slurry was obtained as precursor liquid A.

[0049] Precursor preparation: The precursor solution A was dried and dehydrated with a centrifugal spray dryer. Under the carrier gas pressure of 0.2MPa, the slurry was added to the spray dryer at a rate of 10mL / min, and the inlet and outlet temperatures were kept at 260°C. At around and 100°C, the dried powder is collected by a cyclone separator to obtain precursor B, which is a black powder.

[0050] Heat treatment: Place this precursor B in a tube furnace, and heat treat it at 750°...

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Abstract

The invention relates to a preparation method of positive-electrode cellular material used by a lithium ion battery, and belongs to the technical field of battery materials. The invention provides a preparation method of used positive-electrode cellular material of ferrous phosphate lithium used by the lithium ion battery, the obtained material has large specific surface area and high porosity, large contact area with electrolyte, improves the deintercalation and intercalation rate of Li+, and is favor of improving the volume and the power density; and the method overcomes the defects that the raw materials can not be fully contacted of methods such as a solid phase method, can obtain the material with controllable grain size, even grain size distribution, with a regular porous sphere or sphere-like shape. The method has simple process, can be continually operated and is easy for industrialization production.

Description

[0001] This application is a divisional application with the invention name of a positive electrode porous material for lithium-ion batteries and its preparation method, the filing date is 2007.11.14, and the application number is 200710177320.4. technical field [0002] The invention relates to the technical field of battery materials, in particular to a preparation method of positive electrode materials for lithium ion batteries. Background technique [0003] Lithium-ion battery is a new generation of secondary battery after nickel-cadmium and nickel-metal hydride batteries. The main factors affecting the performance of lithium-ion batteries are: positive electrode materials, negative electrode materials, electrolytes, separators, etc., and positive electrode materials are very important for improving the working voltage, specific energy, cycle life and other important properties of lithium-ion batteries. [0004] Currently commonly used is LiCoO 2 , LiMn 2 o 4 and LiNi...

Claims

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Application Information

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IPC IPC(8): H01M4/1397
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 杨岩峰张敬杰于锋潘顺龙宋广智
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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