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Zinc oxide-metal lithium composite negative electrode and preparation method thereof, and metal lithium secondary battery

A secondary battery, zinc oxide technology, applied in the direction of secondary batteries, battery electrodes, circuits, etc., can solve the problems of reducing battery coulombic efficiency and cycle life, SEI rupture and regeneration, battery efficiency decline, etc., to achieve the purpose of inhibiting dendrites Growth, excellent cycle stability, effect of reducing current density

Inactive Publication Date: 2018-10-23
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when lithium metal is used as the negative electrode material, there will be many problems during the cycle, mainly as follows: (1) Lithium metal is very active, and a layer of SEI (solid electrolyte) film will be formed on the surface of lithium metal immediately when it contacts with the electrolyte. During the cycle, the uneven deposition of lithium will lead to the rupture and regeneration of the SEI, resulting in the continuous consumption of the electrolyte, resulting in a decrease in battery efficiency; (2) during the charge-discharge cycle, dendrites will be formed on the surface of the lithium metal, The continuous growth of dendrites will pierce the separator and contact with the positive electrode, causing internal short circuit of the battery, even fire and explosion, which has great potential safety hazards; (3) during the cycle, the fracture of dendrites will cause "dead lithium", further Reduce the Coulombic efficiency and cycle life of the battery

Method used

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  • Zinc oxide-metal lithium composite negative electrode and preparation method thereof, and metal lithium secondary battery
  • Zinc oxide-metal lithium composite negative electrode and preparation method thereof, and metal lithium secondary battery
  • Zinc oxide-metal lithium composite negative electrode and preparation method thereof, and metal lithium secondary battery

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Embodiment 1

[0039] A method for preparing a zinc oxide-metal lithium composite negative electrode with a three-dimensional structure, comprising the following steps:

[0040] 1) Soak foamed copper slices in acetone, ethanol and deionized water in sequence, and ultrasonically clean them for 30 minutes at an ultrasonic frequency of 50 kHz; put the foamed copper after ultrasonic cleaning into a vacuum drying oven, and dry at 100°C for 10 minutes ;

[0041] 2) Put the dried copper foam into 60mL of zinc nitrate solution with a concentration of 0.03mol / L, and then slowly add 7mL of concentrated ammonia water with a concentration of 13mol / L dropwise, and then hydrothermally react at 110°C for 4h. Deposit zinc hydroxide, then wash the foam copper with zinc hydroxide deposited with a large amount of deionized water, and finally put it in a vacuum drying oven, dry at 200°C for 1.5h, take it out after cooling, and it will be the foam deposited with zinc oxide nano-layer Copper (from figure 1 The ...

Embodiment 2

[0051] A method for preparing a zinc oxide-metal lithium composite negative electrode with a three-dimensional structure, comprising the following steps:

[0052] 1) Soak foamed copper slices in acetone, ethanol and deionized water in turn, and ultrasonically clean them for 60 minutes at an ultrasonic frequency of 30 kHz; put the foamed copper after ultrasonic cleaning into a vacuum drying oven and dry at 50°C for 60 minutes ;

[0053] 2) Put the dried copper foam into 3 mL of zinc nitrate solution with a concentration of 0.05 mol / L, and then slowly add 10 mL of ammonia water with a concentration of 13.5 mol / L dropwise, then hydrothermally react at 75 °C for 10 h, and the foam Deposit zinc hydroxide on the copper surface, then rinse the foamed copper with zinc hydroxide deposited with a large amount of deionized water, and finally put it in a vacuum drying oven, dry it at 120°C for 3 hours, and take it out after cooling to obtain the foam copper deposited with zinc oxide nano-...

Embodiment 3

[0061] A method for preparing a zinc oxide-metal lithium composite negative electrode with a three-dimensional structure, comprising the following steps:

[0062] 1) Soak foamed copper slices in acetone, ethanol and deionized water in sequence, and ultrasonically clean them for 50 minutes at an ultrasonic frequency of 40 kHz; put the foamed copper after ultrasonic cleaning into a vacuum drying oven, and dry at 70°C for 40 minutes ;

[0063] 2) Put the dried copper foam into 60mL of zinc nitrate solution with a concentration of 0.02mol / L, then slowly add 7mL of ammonia water with a concentration of 13.5mol / L dropwise, and react hydrothermally at 90°C for 6h. Deposit zinc hydroxide on the copper surface, then wash the foamed copper with zinc hydroxide deposited with a large amount of deionized water, and finally put it in a vacuum drying oven, dry it at 160°C for 2.5 hours, take it out after cooling, and it will be deposited with zinc oxide nano-layer Copper foam, the thickness...

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Abstract

The invention discloses a zinc oxide-metal lithium composite negative electrode and a preparation method thereof, and a metal lithium secondary battery. The zinc oxide-metal lithium composite negativeelectrode has a three-dimensional structure and comprises foamy copper and metal lithium and zinc oxide compounded in the foamy copper. The negative electrode utilizes combination of foamy copper andmetal lithium, utilizes three-dimensional foamy copper as a skeleton, utilizes a hydrothermal method to deposit a layer of a zinc oxide nano-layer on the foamy copper surface, and utilizes the lithium loving performances of the zinc oxide nano-layer to melt the solid lithium metal into liquid lithium spontaneously adsorbed into the three-dimensional foamy copper skeleton. Compared with the lithium sheet negative electrode, the three-dimensional metal lithium negative electrode has a large specific surface area and can effectively reduce the current density during charging and discharging. Theporous structure can well limit lithium in the internal space, reduce the volume expansion of the lithium negative electrode during charging and discharging, and effectively inhibit the growth of dendrites.

Description

technical field [0001] The invention relates to a zinc oxide-metal lithium composite negative electrode, a preparation method and a metal lithium secondary battery, belonging to the technical field of lithium secondary batteries. Background technique [0002] The successful commercial use of lithium-ion batteries has brought about the rapid development of mobile electronic devices and electric vehicles. At present, most of the commercialized lithium-ion secondary batteries use graphite anode materials, which are low in cost and have a long cycle life. mass production. However, the theoretical capacity of graphite-based negative electrode materials is low, only 372mAh / g. Such a low battery capacity makes it extremely urgent to increase the energy density of lithium secondary batteries. Lithium metal has a very high theoretical capacity (3860mAh / g), low density (0.534g / cm 3 ) and low voltage window (-3.04V vs. standard hydrogen electrode) have attracted the attention of rese...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/1395H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/134H01M4/1395H01M4/366H01M4/382H01M4/628H01M10/0525Y02E60/10
Inventor 陈坚秦立光徐晖王丹朱建峰
Owner SOUTHEAST UNIV
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