A kind of preparation method of nickel molybdate doped carbon quantum dot lithium ion battery negative electrode material

A lithium-ion battery, carbon quantum dot technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as low conductivity and capacity fading, and achieve improved specific capacity and rate performance, high yield, and ease of volume. inflated effect

Active Publication Date: 2020-06-26
SHAANXI UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the lower electrical conductivity and poor Li-ion transport kinetics, micron-sized NiMoO 4 When used as a negative electrode material for lithium-ion batteries, the capacity usually declines sharply after ten cycles

Method used

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  • A kind of preparation method of nickel molybdate doped carbon quantum dot lithium ion battery negative electrode material
  • A kind of preparation method of nickel molybdate doped carbon quantum dot lithium ion battery negative electrode material
  • A kind of preparation method of nickel molybdate doped carbon quantum dot lithium ion battery negative electrode material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) Add 200mg of citric acid to 30ml of hydrogen peroxide, stir at 80°C for 12 hours, then centrifuge at 8000rmp / min for 30min, take the supernatant for dialysis (molecular cut-off: 3500) and freeze-dry to obtain a brown powder;

[0022] 2) Take 0.1g carbon quantum dots, 2.62g nickel chloride hexahydrate (NiCl 2 ·6H 2 (2) and 2g ammonium molybdate are thoroughly mixed and ground in a mortar for 30min;

[0023] 3) Put the ground mixture into a muffle furnace from room temperature to 560°C at a heating rate of 10°C / min and keep it warm for 2 hours, then cool naturally;

[0024] 4) The above products were collected, washed three times with deionized water and absolute ethanol respectively, and then vacuum-dried for 36 hours to obtain nickel molybdate-doped carbon quantum dot lithium-ion battery negative electrode materials.

Embodiment 2

[0026] 1) Add 200mg of citric acid to 30ml of hydrogen peroxide, stir at 80°C for 12 hours, then centrifuge at 8000rmp / min for 30min, take the supernatant for dialysis (molecular cut-off: 3500) and freeze-dry to obtain a brown powder;

[0027] 2) Take 0.4g carbon quantum dots, 2.35g nickel chloride hexahydrate (NiCl 2 ·6H 2 (2) and 1.8g ammonium molybdate are thoroughly mixed and ground in a mortar for 10min;

[0028] 3) Put the ground mixture into a muffle furnace from room temperature to 300°C at a heating rate of 10°C / min and keep it warm for 4 hours, then cool naturally;

[0029] 4) The above products were collected, rinsed with deionized water and absolute ethanol for 5 times, and then vacuum-dried for 24 hours to obtain nickel molybdate-doped carbon quantum dot lithium-ion battery negative electrode materials.

Embodiment 3

[0031] 1) Add 200mg of citric acid to 30ml of hydrogen peroxide, stir at 80°C for 12 hours, then centrifuge at 8000rmp / min for 30min, take the supernatant for dialysis (molecular cut-off: 3500) and freeze-dry to obtain a brown powder;

[0032] 2) Take 0.6g carbon quantum dots, 2g nickel chloride hexahydrate (NiCl 2 ·6H 2 (2) and 1.53g ammonium molybdate are thoroughly mixed and ground in a mortar for 20min;

[0033] 3) Put the ground mixture into a muffle furnace and raise the temperature from room temperature to 400°C for 2.5 hours at a rate of 10°C / min, then cool naturally;

[0034] 4) The above products were collected, rinsed with deionized water and absolute ethanol for 4 times, and then vacuum-dried for 12 hours to obtain nickel molybdate-doped carbon quantum dot lithium-ion battery negative electrode materials.

[0035] Depend on figure 1 It can be seen that the prepared product is NiMoO 4 , compared with the standard PDF card (No.21-0569), it can be seen that the pe...

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Abstract

The invention discloses a preparation method of an NiMoO4-doped carbon quantum dot negative electrode material of a lithium ion battery, and the method comprises the following steps: adding citric acid into hydrogen peroxide, dialyzing supernate, and performing freeze-drying to obtain brown powder; extracting and mixing carbon quantum dots, nickel chloride hexahydrate and ammonium molybdate fullyand uniformly, and performing grinding; and putting the ground mixture into a muffle furnace for sintering, washing the sintered product with deionized water and absolute ethyl alcohol, and carrying out vacuum drying to obtain the nickel molybdate doped carbon quantum dot negative electrode material of the lithium ion battery. The method adopted by the invention has the characteristics of simple process, is short in period, is good in repeatability, is safe and the like. The prepared NiMoO4 nanoparticles doped with the carbon quantum dots have a high specific surface area, so that the specificcapacity of the lithium ion semi-battery is enlarged. In the synthesis process of nickel molybdate, carbon quantum dots are connected with nickel molybdate nanoparticles to limit one-dimensional or two-dimensional oriented growth of the nickel molybdate nanoparticles, thereby obtaining the nickel molybdate doped carbon quantum dot negative electrode material of the lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a preparation method of nickel molybdate doped with carbon quantum dots lithium ion battery negative electrode material. Background technique [0002] With the gradual emergence of energy crisis and environmental pollution, the research and development of sustainable energy has become an urgent task in today's society. As a relatively mature branch of secondary batteries, lithium-ion batteries have a series of advantages, such as high voltage, high capacity and better safety. Binary metal oxides have attracted much attention due to their high lithium storage capacity. [Wang B,Li S,Wu X,et al.Hierarchical NiMoO4nanowire arrays supported on macroporous graphene foam as binder-free 3D anodes for high-performance lithium storage[J].Physical Chemistry Chemical Physics Pccp,2016,18(2):908.] NiO 4 As a member of the binary metal oxide, according to the equation The th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/525H01M4/36H01M4/583H01M4/62H01M10/0525
CPCY02E60/10
Inventor 许占位赵怡星王天关伟伟刘梦宇曹丽云黄剑锋
Owner SHAANXI UNIV OF SCI & TECH
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