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A negative electrode active material for a lithium ion battery, a preparing method thereof, a negative electrode plate of the lithium ion battery and the lithium ion battery

A negative electrode active material, lithium-ion battery technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, batteries, etc., can solve the problems of battery capacity attenuation, active material and conductive agent, poor contact of current collector, etc., and achieve long cycle life , The preparation method is simple and easy to operate, and the effect of alleviating the swelling effect

Inactive Publication Date: 2017-12-15
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when black phosphorus is used in lithium-ion batteries, due to the large volume expansion (about 300%) when it intercalates lithium, it is easy to cause poor contact between the active material, the conductive agent, and the current collector, and the battery capacity rapidly decays.

Method used

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  • A negative electrode active material for a lithium ion battery, a preparing method thereof, a negative electrode plate of the lithium ion battery and the lithium ion battery

Examples

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preparation example Construction

[0032] A second aspect of the embodiment of the present invention provides a method for preparing a negative electrode active material for a lithium ion battery, including:

[0033] The carbon material and black phosphorus are mixed and then ball-milled, the ball-milling speed is 300r / min-700r / min, the ball-milling time is 10h-20h, the carbon material and the black phosphorus are connected by C-P bond to form a complex, that is, lithium ions are obtained A negative electrode active material for a battery; the negative electrode active material for a lithium ion battery includes a composite formed by connecting a carbon material and black phosphorus through C-P bonds.

[0034] In an embodiment of the present invention, the black phosphorus and carbon materials are ball milled under an inert atmosphere. Optionally, black phosphorus and carbon material are added together into a high energy ball mill for ball milling.

[0035] In the embodiment of the present invention, the mass ...

Embodiment 1

[0051] A preparation method of a negative electrode active material for a lithium ion battery, comprising:

[0052] Orthorhombic black phosphorus and artificial graphite were added to a high-energy ball mill at a weight ratio of 7:3, and the ball mill speed was adjusted to 500 r / min.

[0053] The 18650 battery is made according to the conventional method, wherein the negative electrode active material includes a composite formed by ball-milled orthorhombic black phosphorus and artificial graphite balls, the positive electrode active material is lithium cobalt oxide, the electrolyte in the electrolyte is lithium hexafluorophosphate, and the solvent is ethylene carbonate and diethyl carbonate, the additive is vinylene carbonate, and the diaphragm material is polyethylene.

[0054] The battery prepared in Example 1 is tested for performance, and the energy density of the battery is 620wh / L. The cycle performance results are as follows: figure 1 shown, figure 1 It is the cycle c...

Embodiment 2

[0056] A preparation method of a negative electrode active material for a lithium ion battery, comprising:

[0057] Orthorhombic black phosphorus and graphene were added to a high-energy ball mill at a weight ratio of 8:2, the ball mill speed was adjusted to 700 r / min, and the ball mill was taken out after 18 hours to obtain a negative electrode active material for a lithium ion battery.

[0058] 523450 type flexible packaging battery was made according to the conventional method, wherein the negative electrode material comprises a compound formed by ball-milled orthorhombic black phosphorus and graphene, the positive electrode active material is a nickel-cobalt-aluminum ternary material, the electrolyte in the electrolyte is lithium hexafluorophosphate, and the solvent It is ethylene carbonate, dimethyl carbonate and diethyl carbonate, the additives are vinylene carbonate, fluoroethylene carbonate and propane sultone, and the diaphragm material is polypropylene.

[0059] The ...

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Abstract

A negative electrode active material for a lithium ion battery is provided. The active material includes a composite formed by connecting a carbon material and black phosphorus through C-P bonds. The carbon material and the black phosphorus in the active material form the C-P bonds, thus ensuring tight contact between the carbon material and the black phosphorus in charge-discharge processes, and avoiding bad contact with the carbon material and a current collector when the black phosphorus is expanded. In addition, the carbon material is high in flexibility so that expansion of the black phosphorus can be relieved in the aspect of volume. The invention also provides a preparing method of the active material. The method includes mixing the carbon material and the black phosphorus, and then subjecting the mixture to ball milling at a ball milling speed of 300-700 r / min for 10-20 h, wherein the carbon material and the black phosphorus are connected through the C-P bonds to form the composite, and then the active material is formed. The method is simple and easy to operate. The invention also provides a negative electrode plate of the lithium ion battery and the lithium ion battery. The lithium ion battery has extremely high energy density and long cyclic lifetime.

Description

technical field [0001] The invention relates to the field of battery materials, in particular to a lithium ion battery negative electrode active material and a preparation method thereof, a lithium ion battery negative electrode sheet and a lithium ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life, high operating voltage, no memory effect, and wide operating temperature range, and have been widely used in communications, electric vehicles, aerospace and other fields. In recent years, with the rapid development of portable electronic devices and electric vehicles, people have put forward higher requirements for the energy density, power density, and cycle life of lithium-ion batteries. [0003] Anode materials play an important role in improving the performance of lithium-ion batteries. At present, almost all commercial lithium-ion battery anode materials are graphite, which has the advantages of small...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/13H01M4/133H01M4/139H01M4/1393H01M10/0525
CPCH01M4/13H01M4/133H01M4/139H01M4/1393H01M4/364H01M4/38H01M4/583H01M10/0525H01M2220/20H01M2220/30Y02E60/10
Inventor 张晗吕坤张家宜
Owner SHENZHEN UNIV
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