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Cobalt molybdate composite carbon dot lithium ion battery positive electrode material and preparation method thereof

A lithium-ion battery and anode material technology, which is applied in the field of cobalt molybdate composite carbon-dot lithium-ion battery anode materials and its preparation, can solve problems such as volume expansion, capacity attenuation, and cycle life reduction, and achieve process controllability and increase ratio Capacity and energy density, high repeatability effect

Active Publication Date: 2019-03-08
SHAANXI UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[Sandhya, C.P., John, B., Gouri, C, Sreemoolanadhan, H., & Manwatkar, S.K. Promising anode material for lithium-ioncells based on cobalt oxide synthesized by microwave heating. Ionics, 2017.1-9.] [Wang, B. ,Li,S.,Wu,X.,Liu,J.,Tian,W.,&Chen,J.Self-assembly of ultrathinmesoporous CoMoO 4 nanosheet networks on flexible carbon fabric as a binder-free anode for lithium-ion batteries. New Journal of Chemistry, 2016.40(3), 2259-2267.] During the charging and discharging process, due to the intercalation and extraction of lithium ions, the volume of the material occurs Expansion, resulting in capacity decay and cycle life reduction

Method used

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  • Cobalt molybdate composite carbon dot lithium ion battery positive electrode material and preparation method thereof
  • Cobalt molybdate composite carbon dot lithium ion battery positive electrode material and preparation method thereof
  • Cobalt molybdate composite carbon dot lithium ion battery positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1), adding performic acid as an oxide to coal tar pitch and centrifuging for 24 hours to take the supernatant, which is a carbon dot solution using performic acid as a solvent;

[0025] 2), get 0.35g analytically pure ammonium molybdate ((NH 4 )Mo 7 o 24 4H 2 O) Put it in a mortar, then add 0.45 mg cobalt chloride hexahydrate (CoCl 2 ·6H 2 0) Grinding, fully grinding for half an hour; putting the ground mixture into a crucible for sintering in a muffle furnace; heating up to 120°C at a heating rate of 5°C / min, and keeping it warm for one hour; then heating at a heating rate of 1°C / min Speed ​​up to 450°C and keep warm for two hours;

[0026] 3) Naturally cool to room temperature, filter the prepared product with water and ethanol using filter paper with a pore size of 0.224 μm, wash it 3-6 times, and put it in a vacuum drying oven at 70° C. for 24 hours;

[0027] 4) Take the dried product and add it to 30ml of deionized water, mix it well, put it into a polytetraf...

Embodiment 2

[0033] 1), adding performic acid as an oxide to coal tar pitch and centrifuging for 24 hours to take the supernatant, which is a carbon dot solution using performic acid as a solvent;

[0034] 2), get 0.15g analytically pure ammonium molybdate ((NH 4 )Mo 7 o 24 4H 2 O) Put it in a mortar and add 0.35mg of cobalt chloride hexahydrate (CoCl 2 ·6H 20) Grinding, fully grinding for half an hour; putting the ground mixture into a crucible for sintering in a muffle furnace; raising the temperature to 100° C. at a heating rate of 10° C. / min, and keeping it warm for 3 hours; Speed ​​up to 350°C and keep warm for 3 hours;

[0035] 3), naturally cool to room temperature, filter the obtained product with water and ethanol and wash 3-6 times, put it in a vacuum drying oven at 60°C for 24 hours;

[0036] 4) Take the dried product and add it to 5ml of carbon dot solution, mix well, put it into a polytetrafluoroethylene lining, and react with hydrothermal reaction at 150°C for 10h;

[...

Embodiment 3

[0039] 1), adding performic acid as an oxide to coal tar pitch and centrifuging for 24 hours to take the supernatant, which is a carbon dot solution using performic acid as a solvent;

[0040] 2), get 0.65g analytically pure ammonium molybdate ((NH 4 )Mo 7 o 24 4H 2 O) Put it in a mortar and add 0.85mg of cobalt chloride hexahydrate (CoCl 2 ·6H 2 0) Grinding, fully grinding for half an hour; putting the ground mixture into a crucible and sintering in a muffle furnace; raising the temperature to 80°C at a heating rate of 8°C / min, and keeping it warm for 2 hours; Speed ​​up to 300°C and keep warm for 2 hours;

[0041] 3) Naturally cool to room temperature, filter the obtained product with water and ethanol and wash 3-6 times, put it in a vacuum drying oven at 80°C for 24 hours;

[0042] 4) Take the dried product and add it to 30ml of carbon dot solution, mix well, put it into a polytetrafluoroethylene lining, and conduct a hydrothermal reaction at 180°C for 6h;

[0043] 5...

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Abstract

The invention discloses a cobalt molybdate composite carbon dot lithium ion battery positive electrode material and a preparation method thereof. A cobalt molybdate precursor is generated by sinteringammonium molybdate and cobalt chloride hexahydrate as raw materials; and then a nano-particle structure with a bulge is formed by inducing oriented growth of cobalt molybdate by utilizing carbon dotsthrough a hydrothermal method so as to obtain the cobalt molybdate composite carbon dot lithium ion battery positive electrode material. The method has the characteristics of simple preparation process, short period, low energy consumption, good repeatability, high yield and the like; the cobalt molybdate composite material prepared with the method can alleviate the volume expansion and enlarge the ion activation surface area; and due to the existence of the carbon dots, certain pseudocapacitance can be produced, so that the specific capacity and the energy density of the material are improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a cobalt molybdate composite carbon dot lithium ion battery anode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries are mainly used in the electronic and electrical industry, and the latest energy-saving and environmentally friendly lithium-ion battery vehicles have disadvantages such as poor endurance stability and low capacity, which prompts us to look for electrode materials with higher capacity. Intercalation reaction, conversion reaction and alloying reaction are the three major mechanisms of lithium-ion battery reactions and affect the theoretical capacity of materials. For materials with conversion reactions, the first lithium intercalation process is accompanied by Li 2 The generation of O, the oxide turns into a simple metal, and multiple electrons participate in the reaction. Such materials often have high reve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M4/62H01M4/525H01M10/0525
CPCH01M4/362H01M4/525H01M4/5825H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 许占位赵怡星王天孔硌沈学涛杨军黄剑锋曹丽云
Owner SHAANXI UNIV OF SCI & TECH
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