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Cathode material NiCo2S4 nano hexagonal piece for lithium ion battery and preparation method thereof

A kind of technology of lithium ion battery and negative electrode material

Inactive Publication Date: 2018-06-29
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, most researchers use hydrothermal method, solvothermal method and microwave-assisted method to prepare NiCo 2 S 4 , these methods are time-consuming and complicated, and the prepared materials have irregular morphology, poor crystallinity, and low purity (S. Peng, L. Li, C. Li, H. Tan, R. Cai, H. Yu, S. Mhaisalkar, M. Srinivasan, S. Ramakrishna and Q. Yan, Chem. Commun., 2013, 49, 10178; Y. Xiao, Y. Lei, B. Zheng, L. Gu, Y. Wang and D. Xiao, RSC Adv.,2015, 5, 21604; H. Wan, J. Liu, Y. Ruan, L. Lv, L. Peng, X. Ji, L. Miao and J.Jiang, ACS Appl. Mater. Interfaces, 2015, 7, 15840.)

Method used

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  • Cathode material NiCo2S4 nano hexagonal piece for lithium ion battery and preparation method thereof
  • Cathode material NiCo2S4 nano hexagonal piece for lithium ion battery and preparation method thereof
  • Cathode material NiCo2S4 nano hexagonal piece for lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Synthesis of Ni by hydrothermal co-precipitation method 1 / 3 co 2 / 3 (OH) 2 Nano hexagonal sheet:

[0041] 2.5mmolNiCl 2 ∙6H 2 O, 5 mmol CoCl 2 ∙6H 2 O and 45mmol hexamethylenetetramine were dispersed in 1000mL deoxygenated deionized water, and in N 2 In the protection of gas, the magnetic stirring reaction was carried out at 120°C for 5h. After centrifugation, washing with water, and alcohol washing, it was dried in an oven at 60°C to obtain light pink Ni 1 / 3 co 2 / 3 (OH) 2 .

[0042] (2) Anneal to get NiCo 2 o 4 Nano hexagonal sheet:

[0043] 100mg Ni after drying 1 / 3 co 2 / 3 (OH) 2 Put the hexagonal flake powder sample into a quartz crucible. As for the tube furnace, heat it to 500°C in the air at a heating rate of 1°C / min, keep it at this temperature for 2h, and cool it down to room temperature naturally to obtain NiCo 2 o 4 Nano hexagonal sheet.

[0044] (3) Sulfurization to obtain NiCo 2 S 4 Nano hexagonal sheet.

[0045] 100mg NiCo 2 o 4 Pu...

Embodiment 2

[0049] (1) Synthesis of Ni by hydrothermal co-precipitation method 1 / 3 co 2 / 3 (OH) 2 Nano hexagonal sheet:

[0050] 3mmolNiCl 2 ∙6H 2 O, 6 mmol CoCl 2 ∙6H 2 O and 54mmol hexamethylenetetramine were dispersed into 1200mL deoxygenated deionized water, and in N 2 In the protection of gas, the magnetic stirring reaction was carried out at 120°C for 6h. After centrifugation, washing with water, and alcohol washing, it was dried in an oven at 70°C to obtain light pink Ni 1 / 3 co 2 / 3 (OH) 2 .

[0051] (2) Anneal to get NiCo 2 o 4 Nano hexagonal sheet:

[0052] 200mg Ni after drying 1 / 3 co 2 / 3 (OH) 2 Put the hexagonal flake powder sample into a quartz crucible, and heat it to 600°C in the air at a heating rate of 3°C / min in a tube furnace, keep it at this temperature for 6h, and cool it down to room temperature naturally to obtain NiCo 2 o 4 Nano hexagonal sheet.

[0053] (3) Sulfurization to obtain NiCo 2 S 4 Nano hexagonal sheet.

[0054] 200mg NiCo 2 o 4 Put t...

Embodiment 3

[0058] (1) Synthesis of Ni by hydrothermal co-precipitation method 1 / 3 co 2 / 3 (OH) 2 Nano hexagonal sheet:

[0059] 2mmolNiCl 2 ∙6H 2 O, 4 mmol CoCl 2 ∙6H 2 O and 36mmol of hexamethylenetetramine were dispersed in 800mL deoxygenated deionized water, and the 2 In the protection of gas, the magnetic stirring reaction was carried out at 110°C for 4 hours. After centrifugation, washing with water, and alcohol washing, it was dried in an oven at 60°C to obtain light pink Ni 1 / 3 co 2 / 3 (OH) 2 .

[0060] (2) Anneal to get NiCo 2 o 4 Nano hexagonal sheet:

[0061] 50mg Ni after drying 1 / 3 co 2 / 3 (OH) 2 Put the hexagonal flake powder sample into a quartz crucible, and in a tube furnace, heat it to 400°C in air at a heating rate of 2°C / min, keep it at this temperature for 4h, and cool it down to room temperature naturally to obtain NiCo 2 o 4 Nano hexagonal sheet.

[0062] (3) Sulfurization to obtain NiCo 2 S 4 Nano hexagonal sheet.

[0063] 50mg NiCo 2 o 4 Put th...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a cathode material NiCo2S4 nano hexagonal piece for a lithium ion battery and a preparation method thereof. The cathode material for the lithium ion battery is an unit doublet transition metal sulfide NiCo2S4 nano hexagonal piece which is prepared by adopting a coprecipitation method and a gas-phasevulcanization method, the side length of the NiCo2S4 nano hexagonal piece is about 1.35 mu m, and the thickness is about 30 nm. The cathode material presents the prominent electrochemical property, has the high specific capacity and a stable circulation property, and is a superior cathode material for the lithium ion battery. What's more, the material can be widely applied to the lithium ion batteries, supercapacitors, photocatalysis or solar cells. The preparation method has the good universality, the preparation process is simple, the repeatability is good, and the defects that the technology is complex, the repeatability is poor, the yield is low, the environment is polluted existing at a traditional synthesis aspect of sulfide are overcome.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to negative electrode active materials of lithium ion batteries and a preparation method thereof. Background technique [0002] With the vigorous development of lithium-ion battery technology, lithium-ion batteries have occupied the market of small electronic products as secondary batteries so far. However, in recent years, in order to realize the practical application of large-scale energy storage equipment, such as electric vehicles and hybrid electric vehicles, batteries are required to have higher energy density and power density. The negative electrode material plays a decisive role in battery performance, due to the low theoretical capacity of commercial graphite (372mAh g -1 ) cannot meet the demand, so new anode materials for lithium-ion batteries with high capacity and long cycle are urgently needed to be developed. [0003] Transition metal sulf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/5815H01M10/0525Y02E60/10
Inventor 宋云孟禹孙大林朱琳胡林峰
Owner FUDAN UNIV
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