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Preparation method of composite hard carbon sodium-ion battery cathode material

A sodium-ion battery and negative electrode material technology, applied in the field of electrochemical materials, can solve problems such as poor cycle stability, large irreversible capacity, and poor rate performance, and achieve stable product properties, improve cycle stability, and improve liquid absorption performance. Effect

Inactive Publication Date: 2017-01-04
DONGGUAN MCNAIR NEW POWER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although the initial specific capacity of hard carbon materials is high, there are generally problems of large irreversible capacity, poor rate performance, fast attenuation, and poor cycle stability.
Appropriate coating of hard carbon materials is expected to improve the interfacial properties of the materials and inhibit the side reactions between the carbon matrix and the electrolyte. At present, no coated hard carbon materials have been used as anode materials for sodium-ion batteries. In view of this, it is urgent It is necessary to develop a composite hard carbon sodium ion battery anode material to improve the first charge and discharge efficiency and life, improve sodium storage capacity and cycle performance

Method used

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  • Preparation method of composite hard carbon sodium-ion battery cathode material
  • Preparation method of composite hard carbon sodium-ion battery cathode material
  • Preparation method of composite hard carbon sodium-ion battery cathode material

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Embodiment 1

[0029] Embodiment 1: The preparation method of the composite hard carbon sodium ion battery negative electrode material provided by this embodiment comprises the following steps:

[0030] S1: Boron-doped hard carbon and carbon source precursor are mixed and ball-milled at a mass ratio of 9.5:0.5, wherein the boron-doped hard carbon has a particle size of 10-20um and a specific surface area of ​​4-4.2m 2 / g, tap density 0.9~1g / cm 3 , the carbon source precursor is cross-linked starch microspheres, the ball milling time is 2 hours, and the rotation speed is 150r / min;

[0031] S2: Calcining the semi-finished product after mixed ball milling at a high temperature in a protective atmosphere, wherein the calcination temperature is 900° C., and the calcination time is 20 hours, to prepare a composite hard carbon sodium ion battery negative electrode material.

[0032] Specifically, boron-doped hard carbon is prepared by the following steps:

[0033] Disperse thermoplastic phenolic ...

Embodiment 2

[0039]Embodiment 2: the preparation method of the composite hard carbon sodium ion battery negative electrode material that this embodiment provides, it is basically the same as embodiment 1, and difference is:

[0040] S1: Boron-doped hard carbon and carbon source precursor are mixed and ball-milled at a mass ratio of 9.0:1, wherein the boron-doped hard carbon has a particle size of 10-20um and a specific surface area of ​​4-4.2m 2 / g, tap density 0.9~1g / cm 3 , the carbon source precursor is cross-linked starch microspheres, the ball milling time is 4 hours, and the rotation speed is 300r / min;

[0041] S2: Calcining the semi-finished product after mixed ball milling at high temperature in a protective atmosphere, wherein the calcination temperature is 1100° C., and the calcination time is 4 hours, to prepare a composite hard carbon sodium ion battery negative electrode material.

[0042] Specifically, boron-doped hard carbon is prepared by the following steps:

[0043] Disp...

Embodiment 3

[0047] Embodiment 3: the preparation method of the composite hard carbon sodium ion battery negative electrode material that this embodiment provides, it is basically the same as embodiment 1, and difference is:

[0048] S1: Boron-doped hard carbon and carbon source precursor are mixed and ball-milled at a mass ratio of 8.5:1.5, wherein the boron-doped hard carbon has a particle size of 10-20um and a specific surface area of ​​4-4.2m 2 / g, tap density 0.9~1g / cm 3 , the carbon source precursor is cross-linked starch microspheres, the ball milling time is 3 hours, and the rotation speed is 200r / min;

[0049] S2: Calcining the semi-finished product after mixed ball milling at high temperature in a protective atmosphere, wherein the calcination temperature is 1000° C. and the calcination time is 12 hours, to prepare a composite hard carbon sodium ion battery negative electrode material.

[0050] Specifically, boron-doped hard carbon is prepared by the following steps:

[0051] D...

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Abstract

The invention discloses a preparation method of a composite hard carbon sodium-ion battery cathode material. The preparation method comprises the steps that boron-doped hard carbon and a carbon source precursor is mixed to be ball-milled according to the mass ratio of (8.5-9.5):(0.5-1.5), a semi-finished product obtained after mixing and ball-milling is calcined at high temperature in a shielding gas atmosphere, and then the material is obtained, wherein boron-doped hard carbon is obtained by dispersing thermoplastic phenolic resin into absolute ethyl alcohol and then adding boric acid and a curing agent through carbonizing under gradual temperature increasing and grounding, and the carbon source precursor is crosslinked starch microspheres prepared by adopting a reverse emulsification method. Compared with the prior art, the preparation method of the composite hard carbon sodium-ion battery cathode material has the advantages that the technology is simple and convenient and easy to operate, the raw materials are wide in source and low in cost, the first-time charging and discharging efficiency is high, the electrochemical performance, the cycle performance and the safety are good, and the product properties are stable.

Description

technical field [0001] The invention relates to the technical field of electrochemical materials, in particular to a preparation method of a composite hard carbon sodium ion battery negative electrode material. Background technique [0002] The excessive consumption of fossil fuels and the environmental problems they bring have prompted the widespread application of new energy sources. As the most advanced energy storage secondary battery, lithium-ion batteries have been widely used in small electronic products and power batteries of new energy vehicles, and may become a supporting power source for large-scale energy storage projects. However, the potential safety hazards, high cost and shortage of lithium resources of lithium-ion batteries have largely restricted its development and application. With the advent of the era of electric vehicles and smart grids, human demand for lithium will also grow rapidly. According to reports, the global lithium storage capacity is about...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/054
CPCH01M4/366H01M4/587H01M4/628H01M10/054Y02E60/10
Inventor 宋晓娜周训富邓耀明庞佩佩孙淼黄象金赵付双
Owner DONGGUAN MCNAIR NEW POWER
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