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Preparation method and application of composite metal oxide surface modified lithium metal battery negative electrode current collector

A lithium metal negative electrode and lithium metal battery technology, which is applied in the direction of battery electrodes, active material electrodes, electrode carriers/collectors, etc., can solve the problems of poor safety performance, poor cycle performance, and low Coulombic efficiency, and achieve easy operation, The effect of improving discharge specific capacity and cycle performance and improving safety performance

Active Publication Date: 2021-06-11
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to aim at the dendrite growth caused by the uneven deposition of lithium ions in the current lithium metal negative electrode during the cycle, which leads to poor cycle performance, In view of the problems of low Coulombic efficiency and poor safety performance, a preparation method and application of a composite metal oxide surface-modified lithium metal battery negative electrode current collector are provided, so that the deposition of lithium ions can be effectively channeled to inhibit the growth of lithium dendrites and achieve lithium ionization. Improvement of cycle stability and safety performance of metal batteries

Method used

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  • Preparation method and application of composite metal oxide surface modified lithium metal battery negative electrode current collector
  • Preparation method and application of composite metal oxide surface modified lithium metal battery negative electrode current collector
  • Preparation method and application of composite metal oxide surface modified lithium metal battery negative electrode current collector

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Embodiment 1

[0029] Weigh 1.0g (La 0.6 Sr 0.4 ) 0.9 co 0.2 Fe 0.8 o 3+δ Disperse the particles into 5.0g organic solvent N-methylpyrrolidone, stir at room temperature for 6h (300r / min) to obtain a uniform slurry, and then evenly coat it on copper foil, dry it at 60°C for 12h, and then dry it under argon Calcining at 600° C. for 6 hours under a protective atmosphere can obtain the lithium metal battery negative electrode current collector with a composite metal oxide surface modified according to the present invention. by (La 0.6 Sr 0.4 ) 0.9 co 0.2 Fe 0.8 o 3+δ After surface modification, under the protection of dry argon gas, a 20 μm lithium sheet with the same shape and size was attached to the surface of the negative electrode current collector, and kept at 200°C for 1 hour to obtain a negative electrode current collector filled with lithium.

[0030] The scripture (La 0.6 Sr 0.4 ) 0.9 co 0.2 Fe 0.8 o 3+δ The surface-modified lithium metal battery negative current colle...

Embodiment 2

[0032] Weigh 5.0g La 0.6 Sr 0.4 NiO 3 Disperse the particles into 25.0g of organic solvent isopropanol, stir at room temperature for 12h (200r / min) to obtain a uniform slurry, and then evenly coat it on copper foil, dry it at 80°C for 4h, and place it in an argon protective atmosphere Calcined at 900°C for 4 hours to obtain the La 0.6 Sr 0.4 NiO 3 Surface-modified lithium metal battery anode current collector.

[0033] La 0.6 Sr 0.4 NiO 3 The negative electrode current collector of the surface modified lithium metal battery is assembled with lithium metal to form a Li|Cu battery. The diaphragm of the Li|Cu symmetrical battery is a PE diaphragm, and the electrolyte is 1mol / L bistrifluoromethanesulfonylimide lithium dissolved in a volume ratio of 1 : 1 of 1,3-dioxolane (DOL) / ethylene glycol dimethyl ether (DME), and add 1wt% LiNO 3 mixed solution. At a current density of 1mA / cm 2 , The deposition capacity is 1mAh / cm 2 Tested under the conditions, the coulombic effici...

Embodiment 3

[0035] Weigh 3.0g La 0.8 Sr 0.2 CrO 3 Disperse the particles into 10.0g organic solvent dimethyl sulfoxide, stir at room temperature for 8h (240r / min) to obtain a uniform slurry, and then evenly coat it on a copper foil, dry it at 60°C for 12h, and then dry it under argon Calcined at 600°C for 6 hours under a protective atmosphere to obtain the La 0.8 Sr 0.2 CrO 3 Surface-modified lithium metal battery anode current collector. via La 0.8 Sr 0.2 CrO 3 After surface modification, under the protection of dry argon gas, a 50 μm lithium sheet with the same shape and size was attached to the surface of the negative electrode current collector, and kept at 230° C. for 3 hours to obtain a negative electrode current collector filled with lithium.

[0036] La 0.8 Sr 0.2 CrO 3 The negative electrode current collector of the surface modified lithium metal battery is matched with the lithium iron phosphate positive electrode material to form a full battery. The separator of the ...

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Abstract

The invention discloses a preparation method and application of a composite metal oxide surface modified lithium metal battery negative electrode current collector. The preparation method comprises the following steps: dispersing a composite metal oxide in an organic solvent, stirring to obtain uniform slurry, uniformly coating the slurry on a negative electrode current collector, evaporating the solvent, and calcining under the protection of inert gas to obtain the composite metal oxide surface modified lithium metal battery negative electrode current collector. The metal oxide can be mutually permeated and chelated with the negative electrode current collector after being subjected to high-temperature calcination to form a stable composite layer, and the composite layer not only can ensure the structural stability in the charging and discharging process, but also can play a role in dredging deposition of lithium ions, so that the lithium ions are uniformly deposited on one side of the current collector, the growth of lithium dendrites is effectively inhibited, and the utilization rate, the cycling stability and the safety of the lithium metal battery are guaranteed.

Description

technical field [0001] The invention relates to the field of lithium metal battery negative electrode materials and electrochemistry, in particular to a preparation method and application of a lithium metal battery negative electrode current collector with a composite metal oxide surface modification. Background technique [0002] In recent years, with the continuous development of green energy, the energy density growth rate of traditional lithium-ion batteries has been unable to keep up with the demand, and the research on electrochemical energy storage devices has also received great attention. As the most ideal negative electrode material, lithium metal has ultra-high theoretical specific capacity and the lowest electrochemical potential. Lithium metal negative electrodes can be used to match new positive electrode materials such as air and sulfur, and can also be assembled with traditional positive electrode materials to form full batteries, so as to meet the requiremen...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M4/134H01M10/0525
CPCH01M4/667H01M4/66H01M4/134H01M10/0525H01M2004/027Y02E60/10
Inventor 王钢吴琦辰谢淑红黄俏黄建宇
Owner XIANGTAN UNIV
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