A lithium metal battery and its application

A lithium metal battery, lithium nitrate technology, applied in lithium batteries, battery electrodes, non-aqueous electrolyte batteries, etc., can solve the problems of battery capacity, expansion performance and cycle performance reduction, lithium metal active side reactions, electrode structure damage and other problems , to achieve the effect of improving cycle performance and Coulomb efficiency, improving expansion and contraction, and improving circulation and expansion

Active Publication Date: 2022-07-05
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when lithium metal is directly applied to the negative electrode, there are problems such as high activity of lithium metal, easy side reactions with the electrolyte, easy formation of "dendrites" and "dead lithium", and infinite volume changes that lead to electrode structure damage. The capacity, expansion performance and cycle performance of the

Method used

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  • A lithium metal battery and its application
  • A lithium metal battery and its application
  • A lithium metal battery and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] (1) Preparation of composite structure

[0058] Add 0.022g of lithium nitrate to 20mL of N,N-dimethylformamide, stir to dissolve, add 2.2g of PVDF, and stir at 40°C for 12h until the solution is uniform and clear; transfer the solution to a syringe for static electricity. Spinning to obtain a three-dimensional porous structure loaded with lithium nitrate, which is a composite structure. Electrospinning process parameters: the negative pressure is -4kV, the positive pressure is 18kV, the liquid feed rate is 0.3mL / h, the distance between the collecting plate and the needle is 15 cm-20 cm, and the speed of the collecting drum is 2000 rpm. The composite structure obtained by spinning was placed at room temperature and humidity for 24 hours, and then transferred to a vacuum drying oven for drying at 80°C for 12 hours.

[0059] The thickness of the composite structure is 60 μm, the porosity is 85%, and the average pore size is 800 nm.

[0060] The composite structure prepar...

Embodiment 2

[0070] Preparation of composite structures

[0071] Add 0.044g of lithium nitrate to 20mL of N,N-dimethylformamide and stir to dissolve, then add 2.2g of PVDF, and stir at 40°C for 12h until the solution is uniform and clear; transfer the solution to a syringe as per the implementation Electrospinning was carried out by the method of Example 1 to obtain a three-dimensional porous structure loaded with lithium nitrate, that is, a composite structure. The composite structure obtained by spinning was placed at room temperature and humidity for 24 hours, and then transferred to a vacuum drying oven for drying at 80°C for 12 hours.

[0072] The thickness of the composite structure is 60 μm, the porosity is 85%, and the average pore size is 800 nm.

[0073] The composite structure prepared above was supplemented with lithium by cold pressing, and the thickness of the supplemented lithium layer was 20 μm.

[0074] According to the method of Example 1, the negative pole piece, the p...

Embodiment 3

[0076] Preparation of composite structures

[0077] Add 0.11g of lithium nitrate to 20mL of N,N-dimethylformamide, stir to dissolve, add 2.2g of PVDF, and stir at 40°C for 12h until the solution is uniform and clear; transfer the solution to a syringe as per the implementation Electrospinning was carried out by the method of Example 1 to obtain a three-dimensional porous structure loaded with lithium nitrate, that is, a composite structure. The composite structure obtained by spinning was placed at room temperature and humidity for 24 hours, and then transferred to a vacuum drying oven for drying at 80°C for 12 hours.

[0078] The thickness of the composite structure is 60 μm, the porosity is 85%, and the average pore size is 800 nm.

[0079] The composite structure prepared above was supplemented with lithium by cold pressing, and the thickness of the supplemented lithium layer was 20 μm.

[0080] According to the method of Example 1, the negative pole piece, the positive p...

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Abstract

The present application discloses a lithium metal battery, the lithium metal battery includes a positive electrode, a negative electrode, a separator and an electrolyte, the negative electrode includes a composite structure, and the composite structure includes a skeleton and lithium nitrate on the skeleton, and the The skeleton is a three-dimensional porous structure or a two-dimensional structure, and the thickness of the composite structure ranges from 25 μm to 200 μm. In this application, lithium nitrate is compounded on a two-dimensional structure or a three-dimensional porous structure to form a composite structure applied to the negative electrode of lithium metal batteries, which realizes the slow-release function of lithium nitrate, keeps the concentration of lithium nitrate in the electrolyte in a saturated state, and lithium nitrate can Increase the stability of the SEI film during the cycle, slow down the consumption of lithium metal, reduce the side reaction between lithium metal and the electrolyte, and reduce the formation of lithium dendrites, thereby improving the cycle performance and expansion performance of lithium metal batteries. the Coulombic efficiency.

Description

technical field [0001] The application belongs to the technical field of lithium metal batteries, and in particular relates to a composite structure, and also relates to the application of the composite structure in lithium metal batteries, and the application of the lithium metal battery in electronic devices. Background technique [0002] Lithium metal batteries have the advantages of high energy density, high operating voltage, low self-discharge rate, small size and light weight, and have a wide range of applications in the field of consumer electronics. At present, with the rapid development of electric vehicles and mobile electronic devices, people have higher and higher requirements for the energy density, safety and cycle performance of lithium metal batteries. [0003] Lithium metal has the smallest relative atomic mass and the lowest standard electrode potential among all metal elements, as well as high theoretical specific capacity and mass specific energy. There...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/38H01M10/052H01M10/42
CPCH01M4/136H01M10/052H01M2004/027Y02E60/10
Inventor 林小萍陈茂华谢远森
Owner NINGDE AMPEREX TECH
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