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Negative electrode material capable of being rapidly charged at high rate, preparation method thereof, negative plate and battery

A technology of fast charging and negative electrode materials, applied in negative electrodes, battery electrodes, secondary batteries, etc., can solve the problems of slow lithium ion insertion and extraction rate, easy precipitation of lithium dendrites, and limiting the fast charging capability of lithium ion batteries, etc. Achieve the effect of improving high-rate charge-discharge performance and cycle performance, promoting electronic conduction, and improving intercalation rate

Active Publication Date: 2021-02-23
HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the current conventional structure graphite negative electrode shows slow lithium ion intercalation and extraction rates, and lithium dendrites are easily precipitated on the surface of the negative electrode under high-rate charge-discharge conditions, which seriously limits the rapid charging capacity of lithium-ion batteries. Therefore, high-performance lithium-ion batteries are designed Anode materials to achieve fast charging performance while taking into account high energy density are key issues to be solved in the field of lithium-ion batteries

Method used

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  • Negative electrode material capable of being rapidly charged at high rate, preparation method thereof, negative plate and battery
  • Negative electrode material capable of being rapidly charged at high rate, preparation method thereof, negative plate and battery
  • Negative electrode material capable of being rapidly charged at high rate, preparation method thereof, negative plate and battery

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preparation example Construction

[0040] 2. Preparation method of negative electrode material for high-rate fast charging

[0041] The second aspect of the present application provides a method for preparing a negative electrode material for high-rate rapid charging, comprising the following steps:

[0042] Step 1), graphene is added to the carbon source solution to disperse, and the first precursor is obtained after hydrothermal reaction;

[0043] Step 2), dispersing the first precursor in a thermally stable medium, heating the first precursor to obtain a second precursor;

[0044] Step 3), melt coating the hard carbon source on the surface of the second precursor, and obtain a negative electrode material with high rate and fast charging after carbonization treatment.

[0045] In some embodiments, the temperature of the hydrothermal reaction is 130-250° C., the vapor pressure of water in the hydrothermal reaction is 0.3-4 MPa, and the time of the hydrothermal reaction is 4-8 hours. In some embodiments, the ...

Embodiment 1

[0075] A high-rate and fast-charging negative electrode material includes a composite precursor coated with hard carbon, and the composite precursor includes graphene and mesophase carbon microspheres attached to the surface of the graphene.

[0076] The preparation method of the negative electrode material of the high-rate fast charging comprises the following steps:

[0077] Step 1), graphene is added to the sucrose solution to disperse evenly, and the obtained slurry solution is hydrothermally reacted at a constant temperature of 150°C for 6 hours, and the first precursor is obtained after washing and drying; wherein, the number of layers of graphene is 2 layer, the thickness of graphene is less than 5nm, the maximum diameter of graphene sheet is less than 15μm, the concentration of sucrose solution is 20%, and the mass ratio of graphene to sucrose solution is 1:40.

[0078] Step 2), drying and ball milling the first precursor, dispersing the first precursor after ball mill...

Embodiment 2

[0081] A high-rate and fast-charging negative electrode material includes a composite precursor coated with hard carbon, and the composite precursor includes graphene and mesophase carbon microspheres attached to the surface of the graphene.

[0082] The preparation method of the negative electrode material of the high-rate fast charging comprises the following steps:

[0083] Step 1), graphene is added to the sucrose solution to disperse evenly, and the obtained slurry solution is hydrothermally reacted at a constant temperature of 150° C. for 6 hours, and the first precursor is obtained after washing and drying; wherein, the number of layers of graphene is 5 layer, the thickness of graphene is less than 5nm, the maximum diameter of graphene sheet is less than 15μm, the concentration of sucrose solution is 8%, and the mass ratio of graphene to sucrose solution is 1:40.

[0084] Step 2), drying and ball milling the first precursor, dispersing the first precursor after ball mil...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a negative electrode material capable of being rapidly charged at a high rate. The negative electrodematerial comprises a composite precursor coated with hard carbon, and the composite precursor comprises graphene and mesocarbon microbeads attached to the surface of the graphene. The high isotropy of the mesocarbon microbeads is beneficial to internal lithium ion transmission, the graphene can promote electron conduction, the hard carbon coating layer is beneficial to intercalation and deintercalation of lithium ions, and under the combined action of the mesocarbon microbeads, the graphene and the hard carbon coating layer, the high-rate charge-discharge performance and cycle performance ofthe negative electrode material can be remarkably improved.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a negative electrode material for high-rate rapid charging, a preparation method thereof, a negative electrode sheet, and a battery. Background technique [0002] For many years, lithium-ion batteries have been widely used in electronic products, especially 3C digital, drones, small power tools and electric vehicles, due to their stable working voltage platform, high energy density, long cycle life and environmental friendliness. [0003] At present, the requirement of high energy density and large current fast charging performance has become one of the important technical challenges for the development of lithium-ion batteries. Among them, the negative electrode material of lithium-ion batteries is the key factor determining its high-rate charging performance. Graphite is widely used as negative electrode materials for lithium-ion batteries because of its high el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/133H01M10/0525
CPCH01M4/366H01M4/583H01M4/133H01M10/0525H01M2004/027Y02E60/10
Inventor 杨鹏陈宗飞马斌杨山陈杰李载波
Owner HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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