Lithium anode with inorganic protective coating and preparation method thereof

A technology of inorganic protection and lithium negative electrode, applied in the field of lithium negative electrode and its preparation, lithium negative electrode with inorganic protective coating and its preparation, to achieve the effect of simple operation, improved cycle performance and inhibited growth

Inactive Publication Date: 2018-09-21
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have played a very good role in improving the performance of lithium anodes, but the practical application is limited by many conditions. The development of a simple and effective lithium anode protection method is of great significance for the development of high specific energy lithium metal batteries.

Method used

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  • Lithium anode with inorganic protective coating and preparation method thereof
  • Lithium anode with inorganic protective coating and preparation method thereof
  • Lithium anode with inorganic protective coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Mix nickel fluoride powder with a particle size of 50nm and polyvinylidene fluoride binder at a mass ratio of 7:3, add an appropriate amount of N-methylpyrrolidone to adjust the paste viscosity, and stir thoroughly for 12 hours. The uniformly mixed slurry was uniformly dropped on the lithium sheet, and dried in vacuum at 60° C. for 10 h to obtain an inorganic protective coating with a thickness of 500 nm. The prepared lithium flakes were mixed with lithium iron phosphate positive electrode and carbonate-based electrolyte (the solute was 1M LiPF 6 , the solvent is EC:DMC:DEC with a volume ratio of 1:1:1) the battery was assembled in an argon-filled glove box (water, oxygen content ≤ 1ppm), and the performance of the battery was tested after standing for 12 hours. The charging and discharging voltage ranges from 2.5V to 4.2V, and it is activated at 0.1C (1C=170mAh / g) for 3 times and then cycled at 1C. Such as figure 2 As shown, after 500 cycles, the specific capacity i...

Embodiment 2

[0032] Mix tin fluoride powder with a particle size of 60nm and polyvinylidene fluoride binder at a mass ratio of 7:3, add an appropriate amount of N-methylpyrrolidone to adjust the paste viscosity, and stir thoroughly for 12 hours. The uniformly mixed slurry was uniformly dropped on the lithium sheet, and dried in vacuum at 60° C. for 10 h to obtain an inorganic protective coating with a thickness of 500 nm. The prepared lithium flakes were mixed with lithium iron phosphate positive electrode and carbonate-based electrolyte (the solute was 1M LiPF 6 , the solvent is EC:DMC:DEC with a volume ratio of 1:1:1) the battery was assembled in an argon-filled glove box (water, oxygen content ≤ 1ppm), and the performance of the battery was tested after being left for 12 hours. The charging and discharging voltage ranges from 2.5V to 4.2V, and it is activated at 0.1C (1C=170mAh / g) for 3 times and then cycled at 1C. After 500 cycles, the specific capacity is 134.2 mAh / g, and the capacit...

Embodiment 3

[0034] Mix aluminum fluoride powder with a particle size of 50nm and polyvinylidene fluoride binder at a mass ratio of 7:3, add an appropriate amount of N-methylpyrrolidone to adjust the paste viscosity, and stir thoroughly for 12 hours. The uniformly mixed slurry was uniformly dropped on the lithium sheet, and dried in vacuum at 60° C. for 10 h to obtain an inorganic protective coating with a thickness of 300 nm. The prepared lithium flakes were mixed with lithium iron phosphate positive electrode and carbonate-based electrolyte (the solute was 1M LiPF 6 , the solvent is EC:DMC:DEC with a volume ratio of 1:1:1) the battery was assembled in an argon-filled glove box (water, oxygen content ≤ 1ppm), and the performance of the battery was tested after being left for 12 hours. The charging and discharging voltage ranges from 2.5V to 4.2V, and it is activated at 0.1C (1C=170mAh / g) for 3 times and then cycled at 1C. After 500 cycles, the specific capacity is 133.6 mAh / g, and the ca...

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Abstract

The invention discloses a lithium anode with an inorganic protective coating and a preparation method thereof. The lithium anode includes a lithium anode active substance and an inorganic protective coating that covers the same, wherein the lithium anode active substance is lithium metal or lithium alloy; the inorganic protective coating is prepared from a binder and a lithium ion conductor inorganic compound or an inorganic compound that may generate a lithium ion conductor in situ on the surface of the lithium anode. A layer of stable compact inorganic protective film is prepared on the surface of the lithium anode active material by means of direct coating which is simple and low in cost, side reaction between the lithium anode active material and electrolyte is inhibited, uniform deposition of lithium ion is promoted, growth of lithium dendrite is slowed, and safety of the lithium anode is improved. The lithium anode prepared herein has excellent cycle performance, and a new concept for the application of the lithium anode is provided.

Description

technical field [0001] The invention belongs to the field of chemical power sources, and relates to a lithium negative electrode and a preparation method thereof, in particular to a lithium negative electrode with an inorganic protective coating and a preparation method thereof. Background technique [0002] With the development of society, the traditional battery system is becoming more and more difficult to meet people's demand for high specific energy energy storage devices, so it is of great significance to develop high specific energy electrode materials. Lithium metal has the highest specific capacity (3860 mAh / g) and the most negative electrode potential (-3.045 V vs. SHE) among known anode materials, and is one of the most promising anode materials. However, highly active metal lithium is very prone to complex interfacial reactions with the electrolyte, resulting in the consumption of active lithium and electrolyte and the gradual increase of interface impedance, whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139
CPCH01M4/13H01M4/139Y02E60/10
Inventor 高云智刘松松马玉林李素丽徐延铭
Owner HARBIN INST OF TECH
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