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Preparation method of carbon cladding modified lithium manganate anode material

A technology of carbon-coated lithium manganate and lithium manganate, which is applied in the field of preparation of carbon-coated modified lithium manganate cathode materials, can solve the problems of unfavorable large-scale industrial production and high equipment requirements, and achieve good cycle life , Improve surface chemistry, improve electrical conductivity

Inactive Publication Date: 2014-12-10
IRICO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN102280617A uses carbon materials added by hydrothermal method to improve the conductivity and activity of lithium manganate, but the hydrothermal kettle requires high equipment, which is not conducive to large-scale industrial production

Method used

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  • Preparation method of carbon cladding modified lithium manganate anode material
  • Preparation method of carbon cladding modified lithium manganate anode material
  • Preparation method of carbon cladding modified lithium manganate anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) The spinel LiMn 2 o 4 Weigh 100g of the powder and add it to 200ml of deionized water, stir magnetically, and mix evenly.

[0023] 2) Add 15 g of polyvinyl alcohol accounting for 15% by mass of the lithium manganate powder to the obtained mixed liquid, stir and mix evenly.

[0024] 3) Add 0.15 g of manganocene with a mass ratio of 1% of polyvinyl alcohol to the obtained mixed liquid, stir with an emulsifier until emulsified, and mix evenly.

[0025] 4) The obtained mixed solution is sprayed and granulated by a spray dryer to obtain lithium manganate powder evenly coated with organic carbon. The spray drying parameters are set as, the inlet temperature is 250°C, and the outlet temperature is 90°C.

[0026] 5) Put the obtained powder into a crucible, place in a tubular electric furnace, vacuumize, and pass nitrogen, repeat the process of vacuuming and nitrogen for 3 times, and heat at 450°C for 2 hours to obtain a carbon-coated lithium manganate cathode material.

...

Embodiment 2

[0029] 1) The spinel LiMn 2 o 4 Weigh 150g and add it into 400ml deionized water, stir and mix evenly.

[0030] 2) Add 15 g of sucrose accounting for 10% of the mass of lithium manganate powder to the obtained mixed liquid, stir and mix evenly.

[0031] 3) Add 0.45 g of cobaltocene, which accounts for 3% of the mass of sucrose, into the obtained mixed liquid, stir until emulsified state with an emulsifier, and mix evenly.

[0032] 4) The obtained mixed solution is sprayed and granulated by a spray dryer to obtain lithium manganate powder evenly coated with organic carbon. The parameters of spray drying are set as follows: the inlet temperature is 180°C, and the outlet temperature is 60°C.

[0033] 5) The obtained powder was put into a crucible, placed in a tubular electric furnace, evacuated, nitrogen-gassed, the process of vacuuming and nitrogen-gassed was repeated 3 times, and heated at 400°C for 4 hours to obtain a carbon-coated lithium manganate cathode material.

Embodiment 3

[0035] 1) The spinel LiMn 2 o 4 Weigh 200g and add it to 200ml deionized water, stir and mix evenly.

[0036] 2) Add 60 g of glucose accounting for 30% of the mass of the lithium manganate powder to the obtained mixed solution, stir and mix evenly.

[0037] 3) Add 1.8 g of manganese acetate accounting for 3% of the mass of glucose to the obtained mixed solution, stir, stir until emulsified state with an emulsifier, and mix evenly.

[0038] 4) The obtained mixed solution is sprayed and granulated by a spray dryer to obtain lithium manganate powder evenly coated with organic carbon. The spray drying parameters are set as follows: the inlet temperature is 220°C, the outlet temperature is 80°C, and the induced draft fan speed is set to 60%.

[0039] 5) The obtained powder was put into a crucible, placed in a microwave oven, evacuated, nitrogen-filled, repeated 3 times, and heated at 300° C. for 0.5 h to obtain a carbon-coated lithium manganate cathode material.

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Abstract

The invention relates to a preparation method of a carbon cladding modified lithium manganate anode material. The preparation method is characterized by comprising the following steps of: (1) adding lithium manganate into de-ionized water; (2) adding a soluble organic carbon source which accounts for 10-30% of the mass of lithium manganate into the obtained mixed solution; then adding a carbonizing catalyst which accounts for 0.5-5% of the mass of the soluble organic carbon source; (3) spraying and granulating the obtained mixed solution through a spraying drying machine; and (4) adding lithium manganate powder into a crucible, sintering at 300-450 DEG C for 0.5-4 hours and then cooling to obtain the product. According to the preparation method disclosed by the invention, the situation that a lithium manganate crystal form is damaged by high-temperature carbonization is avoided, and metal is reduced and separated out. The electrode conductivity is effectively improved, the surface chemical performance of an active material is improved and an electrode is prevented from directly contacting an electrolyte solution, so that the better circulating service life can be obtained.

Description

technical field [0001] The invention relates to a preparation method of a carbon-coated modified lithium manganate cathode material. Background technique [0002] In lithium-ion batteries, the cathode material is the most important component and the key to determining the performance of lithium-ion batteries. LiCoO 2 、LiFePO 4 and LiMn 2 o 4 It has been widely used as cathode material. With the understanding of lithium-ion battery electrode materials, it is found that its surface structure has a great influence on its electrochemical performance. Due to the excellent electrical conductivity, ultrahigh chemical and electrochemical stability, unique physical properties, and cheap cost of carbon materials, carbon coating has become one of the most widely used methods in lithium-ion batteries. Coating with carbon can effectively improve the conductivity of the electrode, improve the surface chemistry of the active material, and protect the electrode from direct contact wit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505
CPCY02E60/122Y02E60/10
Inventor 刘涛涛
Owner IRICO
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