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High-performance lithium ion battery composite cathode material and preparation method thereof

A composite positive electrode material and lithium-ion battery technology, applied in battery electrodes, secondary batteries, secondary battery repair/maintenance, etc., can solve problems such as complicated and cumbersome methods, uneven surface coating of large particles, spontaneous aggregation of small particles, etc.

Inactive Publication Date: 2019-03-12
SHANGHAI INST OF SPACE POWER SOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional liquid phase coating method grows another component material in situ on the surface of one component material, and generally can obtain a uniform and dense coating layer, but most of the methods are complicated and cumbersome, and the use of solvents causes pollution
The traditional solid-phase coating method is simple, but spontaneous agglomeration of small particles often occurs, resulting in uneven surface coating of large particles, varying thickness, part of the surface is exposed, and the coating is not firm. The covering layer is easy to peel off during the process

Method used

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  • High-performance lithium ion battery composite cathode material and preparation method thereof
  • High-performance lithium ion battery composite cathode material and preparation method thereof
  • High-performance lithium ion battery composite cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Step 1, prepare 400 mL of 0.5 mg / mL graphene ethanol solution, add 10 g of lithium iron phosphate, stir for 0.5 hours, ultrasonically disperse for 2 hours, stir for another 0.5 hours, ultrasonically disperse for 2 hours, and cycle 12 to 24 times; Step 2 , filter and dry the ultrasonically dispersed solution to obtain a composite material of graphene and lithium iron phosphate; step 3, put 88.8g of lithium nickel cobalt aluminate and 1.0g of polyvinylidene fluoride into a mixer and stir for 4~ 6 hours, the stirring speed is 1000rpm~2000rpm; step 4, put the composite material obtained in step 2 and the mixed powder in step 3 into a planetary ball mill, mix for 10~60min, and the ball milling speed is 100rpm~500rpm, and finally get High performance composite cathode material.

[0051] The SEM (scanning electron microscope) figure of the composite cathode material obtained by this embodiment is as follows figure 1 As shown, A is a composite material of graphene and lithium ...

Embodiment 2

[0056] Step 1, prepare 400 mL of 0.5 mg / mL graphene ethanol solution, add 10 g of lithium iron phosphate, stir for 0.5 hours, ultrasonically disperse for 2 hours, stir for another 0.5 hours, ultrasonically disperse for 2 hours, and cycle 12 to 24 times; Step 2 , filter and dry the ultrasonically dispersed solution to obtain a composite material of graphene and lithium iron phosphate; step 3, put 88.8g of nickel-cobalt lithium manganate and 1.0g of polyvinylidene fluoride into a mixer and stir for 4~ 6 hours, the stirring speed is 1000rpm~2000rpm; step 4, put the composite material obtained in step 2 and the mixed powder in step 3 into a planetary ball mill, mix for 10~60min, and the ball milling speed is 100rpm~500rpm, and finally get High performance composite cathode material.

[0057] The rate performance curve of the composite positive electrode material obtained by this embodiment is as follows Figure 5 As shown, A is nickel-cobalt lithium manganate cathode material, an...

Embodiment 3

[0059] Step 1, prepare 400 mL of 1.0 mg / mL graphene ethanol solution, add 20 g of lithium iron phosphate, stir for 0.5 hours, ultrasonically disperse for 2 hours, after stirring for another 0.5 hours, ultrasonically disperse for 2 hours, and cycle 12 to 24 times; Step 2 , filter and dry the ultrasonically dispersed solution to obtain a composite material of graphene and lithium iron phosphate; step 3, put 78.8g of lithium nickel cobalt aluminate and 0.8g of polyvinylidene fluoride into a mixer and stir for 4~ 6 hours, the stirring speed is 1000rpm~2000rpm; step 4, put the composite material obtained in step 2 and the mixed powder in step 3 into a planetary ball mill, mix for 10~60min, and the ball milling speed is 100rpm~500rpm, and finally get High performance composite cathode material.

[0060] The differential thermal analysis (DSC) curve of the first week charge-discharge curve of the composite positive electrode material obtained by this embodiment after the first charge...

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Abstract

The invention discloses a high-performance lithium ion battery composite cathode material and a preparation method thereof. The cathode material comprises a nickel-based lamellar cathode material subjected to polyvinylidene fluoride pretreatment and serving as a first electrode material, and an olivine cathode material which completely coats the first electrode material through lamellar graphene;the graphene accounts for 0.1-0.5% of the total mass of the composite cathode material; polyvinylidene fluoride accounts for 0.5-2.0% of the mass of the composite cathode material; the olivine cathodematerial accounts for 5-20% of the total mass of the composite cathode material, and the balance is the nickel-based lamellar cathode material; a particle diameter ratio of the nickel-based lamellarcathode material to the olivine cathode material is 50 : 1 to 300 : 1. A conductive network is formed among the nickel-based lamellar cathode material, the olivine cathode material and the graphene, so that the ion transmission is facilitated; the structure is firm, so that the discharge capacity of the composite cathode material is higher than that of any one component material; and compared witha traditional nickel-based lamellar cathode material, the nickel-based lamellar cathode material is improved in capacity performance, rate performance, cycle performance and safety performance.

Description

technical field [0001] The invention relates to a high-performance lithium-ion battery composite cathode material and a preparation method thereof. Background technique [0002] Because lithium-ion batteries have outstanding advantages such as high discharge voltage, high specific energy, long cycle life, green environmental protection, small self-discharge, and no memory effect, they are widely used in mobile phones, notebook computers and other portable electrical appliances, and gradually become high-power batteries. Systems such as electric vehicles, smart grids, satellites, and distributed energy systems are expanding. [0003] The electrochemical performance of lithium-ion batteries mainly depends on the structure and properties of the electrode materials and electrolytes used, especially the electrode materials. The first cathode material to be commercialized is LiCoO 2 , is still widely active in the commercial market. But LiCoO 2 The Co element in the positive e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/58H01M4/62H01M10/0525H01M10/42
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M4/5825H01M4/625H01M4/628H01M10/0525H01M10/4235Y02E60/10
Inventor 朱蕾贾荻江小标吴勇民汤卫平
Owner SHANGHAI INST OF SPACE POWER SOURCES
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