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Three-dimensional porous metal lithium cathode active material and preparation method thereof and cathode

An anode active, three-dimensional porous technology, used in active material electrodes, carbon preparation/purification, negative electrodes, etc., can solve problems such as high volume effect and dendrite, so as to alleviate the volume effect, solve dendrites, reduce surface The effect of apparent current density

Inactive Publication Date: 2020-11-20
CENT SOUTH 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 provide a three-dimensional porous metal lithium anode active material, its preparation method and anode, aiming to solve the problems of dendrites and high volume effect in the existing lithium metal anode during repeated cycles

Method used

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  • Three-dimensional porous metal lithium cathode active material and preparation method thereof and cathode
  • Three-dimensional porous metal lithium cathode active material and preparation method thereof and cathode
  • Three-dimensional porous metal lithium cathode active material and preparation method thereof and cathode

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Add 2.5g of dopamine hydrochloride, 0.25g of melamine, 0.25g of boric acid, and 0.3g of a silicon template (400nm in diameter) into 400mL of deionized water, adjust the pH value to 9, stir for 24 hours, wash, filter, and dry to obtain a solid material. Anneal in a tube furnace, the heating rate is 5°C / min, the carbonization temperature is 900°C, the time is 3h, the cooling rate is 5°C / min, the obtained black material is washed to remove the template, cleaned, filtered and dried to obtain boron-nitrogen co-doped Porous carbon sphere material (specific surface area is 69m 2 / g, the carbon wall thickness is 20nm, and the internal cavity volume accounts for 85% of the total volume), such as figure 1 Shown is the SEM image of the material, figure 2 TEM image of the material. Among them, the boron content is 2.1 at.%, the nitrogen element content is 4.6 at.%, image 3 , Figure 4 , Figure 5 The EDS surface scanning image of the prepared material.

[0031] Then take 0....

Embodiment 2

[0048] Add 2.5g of dopamine hydrochloride, 0.25g of melamine, 0.25g of boric acid, and 0.3g of a silicon template (400nm in diameter) into 400mL of deionized water, adjust the pH value to 9, stir for 24 hours, wash, filter, and dry to obtain a solid material, which is placed in Anneal in a tube furnace with a heating rate of 5°C / min, a carbonization temperature of 900°C for 3 hours, and a cooling rate of 5°C / min. The obtained black material was washed to remove the template, cleaned, filtered and dried to obtain boron-nitrogen co-doped porous Carbon sphere material (specific surface area is 69m 2 / g, the carbon wall thickness is 25nm, and the volume of the inner cavity accounts for 85% of the total volume, wherein the boron content is 2.1 at.%, and the nitrogen element content is 4.6 at.%).

[0049] Then take 0.24g of boron-nitrogen co-doped porous carbon sphere material and 0.06g of polyvinylidene fluoride and mix it, and then coat it on copper foil with a coating thickness o...

Embodiment 3

[0051] Add 2.5g of dopamine hydrochloride, 0.25g of melamine, 0.25g of boric acid, and 0.3g of a silicon template (400nm in diameter) into 400mL of deionized water, adjust the pH value to 9, stir for 24 hours, wash, filter, and dry to obtain a solid material, which is placed in Anneal in a tube furnace with a heating rate of 5°C / min, a carbonization temperature of 900°C for 3 hours, and a cooling rate of 5°C / min. The obtained black material was washed to remove the template, cleaned, filtered and dried to obtain boron-nitrogen co-doped porous Carbon sphere material (specific surface area is 69m 2 / g, the carbon wall thickness is 25nm, and the volume of the inner cavity accounts for 85% of the total volume, wherein the boron content is 2.1 at.%, and the nitrogen element content is 4.6 at.%).

[0052] Then take 0.24g of boron-nitrogen co-doped porous carbon sphere material and 0.06g of polyvinylidene fluoride and mix it, and then coat it on copper foil with a coating thickness o...

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Abstract

The invention discloses a three-dimensional porous metal lithium cathode active material and a preparation method thereof and a cathode, the cathode active material is a boron-nitrogen co-doped porouscarbon sphere material, and the method comprises the following steps: adding a carbon source, a nitrogen source, a boron source and a template into a solvent to prepare a precursor solution; stirringand reacting the precursor solution for a certain time, and then sequentially cleaning, filtering and drying to obtain a solid material; and annealing and carbonizing the solid material, and sequentially cleaning, filtering and drying to obtain the boron-nitrogen co-doped porous carbon sphere material. According to the metal lithium cathode active material provided by the invention, the apparentcurrent density can be effectively reduced, the volume effect is relieved, the interface reaction is inhibited, and the problems of dendritic crystal, low coulombic efficiency, poor circularity and the like of an existing metal lithium cathode are solved; and the first-circle specific capacity and the cycling stability of the material are obviously improved.

Description

technical field [0001] The invention relates to the technical field of lithium metal batteries, in particular to a three-dimensional porous metal lithium anode active material, a preparation method thereof and an anode. Background technique [0002] Lithium metal anode with up to 3860mA / cm 2 The theoretical specific capacity and the electrode potential of -3.045V (relative to the standard hydrogen electrode) are known as the "Holy Grail" grade anode material. However, problems such as dendrites and high volume effects in the lithium anode during repeated cycles lead to Its Coulombic efficiency is low, and the cycle performance is poor; and the growth of lithium dendrites may pierce the separator and cause a short circuit, causing serious safety problems. From the perspective of the industrialization of lithium anodes, the solution to the anode volume effect is to use ultra-thin lithium anodes or three-dimensional current collectors. Ultra-thin lithium anodes refer to lithiu...

Claims

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Application Information

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IPC IPC(8): H01M4/587H01M4/62H01M4/134H01M10/052C01B32/05
CPCC01B32/05H01M4/134H01M4/587H01M4/628H01M10/052H01M2004/021H01M2004/027Y02E60/10
Inventor 洪波赖延清高春晖董庆元张凯张治安
Owner CENT SOUTH UNIV
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