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Anode polyporous material of lithium ion cell and preparation method thereof

A technology for lithium ion batteries and porous materials, which is applied in the field of positive electrode materials for lithium ion batteries and their preparation, can solve problems such as insufficient contact of raw materials, and achieves overcoming irregular product morphology, excellent surface and easy coating, and improved de-intercalation. effect of speed

Inactive Publication Date: 2009-05-20
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] 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 raw materials, and overcomes the problems of raw materials in methods such as solid-phase methods. Defects that cannot be fully contacted, and obtain materials with controllable particle size, uniform particle size distribution, and regular porous spherical or spherical appearance

Method used

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  • Anode polyporous material of lithium ion cell and preparation method thereof
  • Anode polyporous material of lithium ion cell and preparation method thereof
  • Anode polyporous material of lithium ion cell and preparation method thereof

Examples

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Effect test

Embodiment 1

[0037] Homogenization treatment of raw materials: Weigh lithium nitrate, iron nitrate and ammonium dihydrogen phosphate 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 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.

[0038] 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.

[0039] Heat treatment: Place this precursor B in a tube furnace, heat treat at 800°C for 12 h...

Embodiment 2

[0042] 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.

[0043] 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.

[0044] Heat treatment: Place this precursor B in a tube furnace, heat treat at 550°C for 36...

Embodiment 3

[0047] Homogenization treatment of raw materials: Weigh lithium nitrate, ferric oxide and phosphoric acid according to the Li:Fe:P molar ratio of 1:1:1, dissolve them in water, add acetylene black according to the 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.

[0048] 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.

[0049] Heat treatment: Place this precursor B in a tube furnace, and heat treat it...

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Abstract

The invention relates to a positive pole porous material for a lithium ion cell and a method for preparing the same, which belongs to the technical field of cell materials. The invention provides a positive pole porous composite material lithium ferrous phosphate for the lithium ion cell and the method for preparing the same. The material has large specific surface area, high porosity, and large contact area with an electrolytic solution, thereby improving the deintercalation speed rate of Li<+> and contributing to improving the capacity and the power density; besides, the method overcomes the defect that raw materials used by methods such as a solid phase method cannot be contacted with each other sufficiently, and obtain a material with controllable particle size, even particle size distribution, and regular porous spherical or similar spherical appearance. The method has the advantages of simple process, continuous operation and easy industrial production.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a cathode material for a lithium ion battery and a preparation method thereof. Background technique [0002] 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. [0003] Currently commonly used is LiCoO 2 , LiMn 2 o 4 and LiNiO 2 . However, the lack of cobalt resources limits the LiCoO 2 Applications of LiNiO 2 Difficult to synthesize, there is an obvious exothermic reaction during charging and discharging, which may cause safety problems, LiMn 2 o 4 When working ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/04C01B25/45B01J19/00
CPCY02E60/12Y02E60/10
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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