Preparation method of zinc oxide/carbon composite material for negative electrode of lithium ion battery

A technology of lithium-ion batteries and carbon composite materials, which is applied in the field of preparation of lithium-ion battery negative electrode materials, can solve the problems of poor conductivity, long preparation cycle, and small specific surface area of ​​zinc oxide, and achieve the purpose of overcoming poor conductivity, improving small specific surface area, Effect of improving electrochemical performance and cycle stability

Inactive Publication Date: 2019-02-05
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0006] The present invention uses Zn(CH 3 COO) 2 Using polyvinylpyrrolidone (PVP) as a raw material, the nanofiber membrane is obtained by electrospinning technology, and the zinc oxide / carbon composite material obtained after burning it under an inert atmosphere has the morphology of zinc oxide nanofibers and chain-like carbon. Interlacing forms a three-dimensional network structure, which can overcome the problems of poor electrical conductivity and serious volume expansion effect of zinc oxide, and improve the defects of zinc oxide as a negative electrode material for lithium-ion batteries, such as small specific surface area, long preparation cycle, and poor electrical conductivity, so as to improve overall performance. Electrochemical performance and cycle stability of lithium-ion batteries

Method used

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  • Preparation method of zinc oxide/carbon composite material for negative electrode of lithium ion battery
  • Preparation method of zinc oxide/carbon composite material for negative electrode of lithium ion battery
  • Preparation method of zinc oxide/carbon composite material for negative electrode of lithium ion battery

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Embodiment 1

[0026] Step 1, preparation of electrospinning precursor solution:

[0027] Weigh 0.5054g Zn(CH 3 COO) 2 Dissolve in 10ml of methanol, and stir for 2h, then add to the Zn(CH 3 COO) 2 Add 0.8480g of PVP to the solution, stir for 5.5h and let stand.

[0028] Step two, Zn(CH 3 COO) 2 Preparation of / PVP nanofiber membrane:

[0029] Take 5mL of the precursor solution obtained in step 1 and add it to the syringe, control the positive working voltage to 15kV, and the negative voltage to 1.5Kv, adjust the distance between the receiver and the spinning needle to be 20cm, and the outflow speed of the solution to be 0.15ml / h, to obtain Zn(CH 3 COO) 2 / PVP nanofiber membrane.

[0030] The third step, the preparation of zinc oxide / carbon nanofibers:

[0031] The spun fibers were placed in a tube furnace, fed with argon, and fired at 800°C at a rate of 5°C / min for 2 h. Then cool down to room temperature naturally to obtain zinc oxide / carbon nanofibers.

[0032] in, figure 1 It i...

Embodiment 2

[0037] Step 1, preparation of electrospinning precursor solution:

[0038] Weigh 0.5054g Zn(CH 3 COO) 2 Dissolve in 20ml of methanol, and stir for 2h, then add to the Zn(CH 3 COO) 2 Add 0.8480g of PVP to the solution, stir for 8 hours and let stand.

[0039] Step two, Zn(CH 3 COO) 2 Preparation of / PVP nanofiber membrane:

[0040] Take 8mL of the precursor solution obtained in step 1 and add it into the syringe, control the working positive voltage to 15kV, and the negative voltage to 1kV, adjust the distance between the receiver and the spinning needle to be 20cm, and the outflow rate of the solution to be 0.15ml / h to obtain Zn(CH 3 COO) 2 / PVP nanofiber membrane.

[0041] Step 3, preparation of zinc oxide / carbon nanofibers:

[0042] The spun fibers were placed in a tube furnace, fed with argon, and fired at 800°C at a rate of 5°C / min for 2 h. Then cool down to room temperature naturally to obtain zinc oxide / carbon nanofibers.

Embodiment 3

[0044] The first step, preparation of electrospinning precursor solution:

[0045] Weigh 0.5054g Zn(CH 3 COO) 2 Dissolve in 10ml of methanol, and stir for 2h, then add to the Zn(CH 3 COO) 2 Add 0.8480g of PVP to the solution, stir for 5.5h and let stand.

[0046] The second step, Zn(CH3COO) 2 Preparation of / PVP nanofiber membrane:

[0047] Add the mixed solution into the syringe, control the working voltage to 20kV, adjust the distance between the receiver and the spinning needle to 10cm, and the outflow rate of the solution to 0.2ml / h to obtain Zn(CH3COO)2 / PVP nanofiber membrane.

[0048] The third step, the preparation of zinc oxide / carbon nanofibers:

[0049] The spun fibers were placed in a tube furnace, fed with argon, and fired at 800°C at a rate of 5°C / min for 2 h. Then cool down to room temperature naturally to obtain zinc oxide / carbon nanofibers.

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Abstract

The invention relates to a preparation method of a zinc oxide/carbon composite material for a negative electrode of a lithium ion battery. The method comprises the following steps: taking Zn(CH3COO)2and polyvinylpyrrolidone (PVP) as raw materials and treating through an electrostatic spinning technology to obtain a nano fiber film; firing the nano fiber film under an inert atmosphere to obtain the zinc oxide/carbon composite material and the shape of the zinc oxide/carbon composite material is a three-dimensional net-shaped stereoscopic structure formed by mutually staggering zinc oxide nano-fibers and chain-shaped carbon, so that the problems that the conductivity of zinc oxide is poor and the volume expansion effect is serious can be overcome; the defects of small specific surface area,long preparation period, poor conductivity and the like when the zinc oxide is used as a negative electrode material of the lithium ion battery are improved, so that the electrochemical performance and circulating stability of the lithium ion battery are improved on the whole.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery preparation, in particular to a preparation method of a lithium ion battery negative electrode material. technical background [0002] With the development of portable electronic devices and hybrid electric vehicles, the demand for high-energy and high-power batteries has become increasingly urgent, which has inspired a large number of researchers to invest in the exploration and research of lithium-ion battery anode materials. Graphite is currently the most widely used commercial anode material for lithium-ion batteries. However, the theoretical capacity of graphite is only 375mAh / g, which gradually cannot meet the application requirements of batteries in today's society, especially the high specific capacity demand of power energy. Compared with graphite, ZnO is quite abundant in storage and has a higher theoretical capacity (988 mAh / g), which is considered as a promising anode mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525B82Y30/00B82Y40/00D01D5/00D01D10/02D04H1/4382D04H1/76
CPCB82Y30/00B82Y40/00D01D5/003D01D5/0076D01D5/0092D01D10/02D04H1/4382D04H1/76H01M4/364H01M4/483H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 王新单真真
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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