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Lithium metal composite negative electrode containing rigid particle framework and preparation method of lithium metal composite negative electrode

A lithium metal and negative electrode technology, applied in the field of secondary high energy density batteries, can solve the problems of difficult to cope with large electrode volume changes, low lithium ion conductivity at room temperature, limited development, etc., to improve full battery performance and cycle performance. , the effect of good electrochemical/chemical stability, high theoretical specific capacity of negative electrode

Active Publication Date: 2021-06-25
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current solid-state electrolytes generally have disadvantages such as low room temperature lithium ion conductivity, complex synthesis conditions, and high prices, which limit their current development to a certain extent.
[0006] Studies have shown that improving the mechanical strength of battery separators and artificial electrolyte interface films can effectively inhibit the growth of lithium dendrites, but it is difficult for conventional two-dimensional modified interfaces to cope with large electrode volume changes during deep charge and discharge (>3mAh cm -2 )

Method used

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  • Lithium metal composite negative electrode containing rigid particle framework and preparation method of lithium metal composite negative electrode
  • Lithium metal composite negative electrode containing rigid particle framework and preparation method of lithium metal composite negative electrode
  • Lithium metal composite negative electrode containing rigid particle framework and preparation method of lithium metal composite negative electrode

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Embodiment 1

[0031] Mix 0.5 g of nano-diamond particles (100 nm in diameter) with 10 mL of aluminum acetate aqueous solution (concentration of 0.5 M L -1 ) stirring, heating and drying the solvent, and calcining in a muffle furnace at 350 ° C for 2 hours to obtain nano-diamond particles with a surface modification layer, as shown in the high-resolution transmission electron microscope figure 1 shown.

[0032] In an argon glove box, 0.5 g of nano-diamond particles with a surface modification layer were added to molten lithium metal (1 g), and melted and stirred at 200 ° C for 0.5 hours, and the mixed slurry was cooled and rolled to obtain a thickness of 200μm lithium metal composite negative electrode, the scanning electron microscope image of the lithium metal composite negative electrode is as follows figure 2 As shown, lithium metal is filled in the framework of particle accumulation.

[0033] The lithium metal composite negative electrode is used as the negative electrode, and lithiu...

Embodiment 2

[0035] Mix 0.5 g of nano-diamond particles (100 nm in diameter) with 5 mL of magnesium nitrate aqueous solution (concentration of 1.0 M L -1 ) stirring, heating and drying the solvent, and calcining in a muffle furnace at 300° C. for 2 hours to obtain nano-diamond particles with a surface modification layer.

[0036] In an argon glove box, 0.5 g of nanodiamond particles with a surface modification layer were added to molten lithium metal (0.75 g), and melted and stirred at 200° C. for 0.5 hours. After the mixed magma was cooled, it was rolled to obtain a lithium metal composite negative electrode with a thickness of 100 μm.

[0037] The lithium metal composite negative electrode was used as the negative electrode, and the sulfur was used as the positive electrode (3mAh cm -2 ) full battery test, using a single-layer polypropylene film as a diaphragm, charging and discharging at a constant current of 0.5C on a battery tester (Wuhan Landian Company), the Coulombic efficiency of...

Embodiment 3

[0039] Mix 0.5g nano-montmorillonite particles (200nm in diameter) with 10mL tetrabutyl titanate ethanol solution (concentration: 1.0ML -1 ) stirring, heating and drying the solvent, and calcining in a muffle furnace at 300°C for 3 hours.

[0040] In an argon glove box, 0.5 g of nano-montmorillonite particles with a surface modification layer were added to molten lithium metal (1.0 g), and melted and stirred at 250° C. for 0.5 hours. After the mixed magma was cooled, it was rolled to obtain a lithium metal composite negative electrode with a thickness of 200 μm.

[0041] The lithium metal composite negative electrode is used as the negative electrode, and nickel-cobalt lithium manganese oxide is used as the positive electrode (3mAh cm -2 ) full battery test, using a single-layer polypropylene film as a diaphragm, charging and discharging at a constant current of 0.5C on a battery tester (Wuhan Landian Company), the Coulombic efficiency of the battery can reach 99.9%, and the cy...

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Abstract

The invention discloses a lithium metal composite negative electrode containing a rigid particle framework and a preparation method of the lithium metal composite negative electrode. The lithium metal composite negative electrode is composed of high-mechanical-strength particles with surface modification layers, and lithium metal. The high-mechanical-strength particles with the surface modification layers forms a porous rigid particle framework and has ultrahigh Young modulus and small Poisson's ratio; uneven lithium metal can grow in the porous rigid particle framework in a confinement mode when deformed, uneven lithium deposition can be mechanically deformed, and lithium metal deposition is stabilized. The invention also provides a preparation method of the lithium metal composite negative electrode. The preparation method comprises the following steps of: under the protection of inert gas, adding high-mechanical-strength particles with surface modification layers into molten lithium metal, performing melting and stirring, cooling mixed molten slurry, and performing rolling to obtain the lithium metal composite negative electrode. The preparation method is simple to operate and stable in process.

Description

technical field [0001] The invention relates to the technical field of secondary high-energy density batteries, in particular to a lithium metal composite negative electrode containing a rigid particle skeleton and a preparation method thereof. Background technique [0002] Lithium metal is the lightest metal (0.534g cm -3 ), its theoretical capacity is 3860mAh g -1 , which is about 10 times that of graphite negative electrode, which can greatly improve the energy density of lithium batteries. However, during repeated charging and discharging of lithium metal batteries, dendritic lithium deposits are easily formed on the surface of the negative electrode, and the huge volume effect easily causes internal stress fluctuations, resulting in low lithium coulombic efficiency, short cycle life, and battery explosion in severe cases. [0003] Aiming at the problems of high chemical activity and dendrite deposition of lithium metal negative electrode, a passivation film can be for...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M10/052H01M10/42H01M4/04
CPCH01M4/366H01M4/38H01M10/052H01M10/4235H01M4/043Y02E60/10
Inventor 陆盈盈张魏栋
Owner ZHEJIANG UNIV
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