Preparation and application of lithium metal anode with composite film

A lithium metal negative electrode and composite film technology, which is applied in the direction of battery electrodes, non-aqueous electrolyte battery electrodes, structural parts, etc., can solve the problems of lithium dendrites, cycle life reduction, lithium deposition and pulverization, etc., and achieve the goal of reducing dead lithium Produce, prolong cycle life, and reduce lithium consumption

Inactive Publication Date: 2019-08-30
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, due to its active chemical properties, lithium metal has the following problems during use: (1) lithium metal will deposit unevenly on the current collector during charge and discharge, resulting in lithium dendrite phenomenon, lithium dendrite The continuous growth of the lithium metal may eventually pierce the battery diaphragm, causing a short cir

Method used

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  • Preparation and application of lithium metal anode with composite film
  • Preparation and application of lithium metal anode with composite film
  • Preparation and application of lithium metal anode with composite film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Carbonized polyacrylonitrile, lithium nitrate, and acrylonitrile copolymer were uniformly mixed in a mass ratio of 8:1:1 with water as a solvent to form a slurry, which was coated on a copper foil current collector with a coating thickness of 10 μm. After the solvent evaporates, the copper foil is punched into a pole piece with a diameter of 16mm. The pole piece, separator, and lithium metal were assembled into a button cell in an argon-protected glove box, and an electrolyte solution of ethylene carbonate and diethyl carbonate (volume ratio 1:1) with a concentration of 1M lithium hexafluorophosphate was added.

[0037] The button cell assembled by the above method was charged at 0.5mA / cm 2 Discharge for 20 hours at a current density of 10 mAh / cm on the surface of the current collector 2 of lithium metal. After the discharge is completed, the above-mentioned button battery is disassembled, and the current collector deposited with lithium metal is taken out, such as f...

Embodiment 2

[0039] Carbonized polyacrylonitrile, lithium nitrate, and acrylonitrile copolymer were uniformly mixed in a mass ratio of 8:1:1 with water as a solvent to form a slurry, which was coated on a copper foil current collector with a coating thickness of 10 μm. After the solvent evaporates, the copper foil is punched into a pole piece with a diameter of 16mm. The pole piece, separator, and lithium metal were assembled into a button cell in an argon-protected glove box, and an electrolyte solution of ethylene carbonate and diethyl carbonate (volume ratio 1:1) with a concentration of 1M lithium hexafluorophosphate was added.

[0040] The button cell assembled by the above method was charged at 1mA / cm 2 The Coulombic efficiency test is carried out at a current density of 100,000 to make lithium repeatedly deposited and stripped on the copper foil covered with a composite film, and the Coulombic efficiency is obtained by the amount of lithium deposited and stripped per cycle, as shown ...

Embodiment 3

[0043] The selected inorganic substance is lithium fluoride. All the other are identical with embodiment 1.

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Abstract

The invention belongs to the field of lithium batteries, and discloses preparation and application of a lithium metal anode with a composite film. The preparation method comprises the following stepsof: (1) performing matching and composite load of an organic component and an inorganic lithium compound component according to the mass ratio of 1:1-98:1 on a current collector; and (2) assembling the obtained current collector with the surface coated with a composite film with a lithium sheet into a battery for electrochemical deposition to deposit the metal lithium on the current collector withthe surface coated with the composite film so as to obtain a lithium metal anode material with a composite film. According to the invention, the lithium metal anode material with the composite film is obtained by improving the overall design of the flow process of the anode material preparation method, the phenomenon of lithium dendrite caused by uneven deposition in the circulation process of the conventional lithium metal anode and the phenomenon of reduced circulation performance caused by dead lithium generated by the reaction of the lithium metal anode and electrolyte can be solved, andthe lithium metal anode material can be used as the anode in a lithium metal battery, so that the circulation life of the lithium metal battery is prolonged.

Description

technical field [0001] The invention belongs to the field of lithium batteries, and more specifically relates to the preparation and application of a lithium metal negative electrode with a composite film. Background technique [0002] Lithium metal has the lowest reduction potential (-3.04V compared with standard hydrogen electrode) and the lightest metal density (0.53g / cm 3 ), which has a very high theoretical specific capacity (3860mAh / g), so it is regarded as the negative electrode material for the next generation of high specific energy secondary batteries. [0003] However, due to its active chemical properties, lithium metal has the following problems during use: (1) lithium metal will deposit unevenly on the current collector during charge and discharge, resulting in lithium dendrite phenomenon, lithium dendrite The continuous growth of the lithium metal may eventually pierce the battery diaphragm, causing a short circuit, and even cause the battery to explode and c...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/139H01M10/0525
CPCH01M4/13H01M4/139H01M10/0525Y02E60/10
Inventor 谢佳姜智鹏胡伟金留
Owner HUAZHONG UNIV OF SCI & TECH
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