Unlock instant, AI-driven research and patent intelligence for your innovation.

A high-concentration lithium bisfluorosulfonyl imide-lithium nitrate-1,3-dioxane electrolyte solution and its preparation method and corresponding battery

A technology of lithium bisfluorosulfonimide and dioxane, which is applied in the field of electrolyte materials for lithium batteries, can solve problems such as inability to popularize, and achieve the effects of cheap raw materials, low energy consumption and simple preparation process

Active Publication Date: 2021-01-22
HANGZHOU SKYRICH POWER CO LTD
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] A variety of methods have been reported to try to solve the above problems, such as chemical or physical prefabricated lithium metal surface rigid interface layer, lithium metal anode alloy method, solid electrolyte method, etc., but these methods have huge defects or introduce new problems and cannot be promoted

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A high-concentration lithium bisfluorosulfonyl imide-lithium nitrate-1,3-dioxane electrolyte solution and its preparation method and corresponding battery
  • A high-concentration lithium bisfluorosulfonyl imide-lithium nitrate-1,3-dioxane electrolyte solution and its preparation method and corresponding battery
  • A high-concentration lithium bisfluorosulfonyl imide-lithium nitrate-1,3-dioxane electrolyte solution and its preparation method and corresponding battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Using bisfluorosulfonimide lithium lithium salt as the electrolyte, lithium nitrate as a passivator, and 1,3-dioxane as a solvent, configure the electrolyte in a glove box protected by an argon atmosphere, in which bisfluorosulfonyl The concentration of lithium imide is 2.5molL -1 , LiNO 3 The concentration is 0.5molL -1 . Then assemble it into lithium / lithium and lithium / copper button cells (CR2025), and test the cycle efficiency and cycle stability of the lithium metal anode material respectively. The diameter of the lithium sheet is 12mm, and the diameter of the copper sheet is 18mm.

[0030] figure 1 a is the cycle diagram of the lithium / copper button cell prepared in this embodiment and the corresponding cycle efficiency of each circle, and the current density is 2mAcm -2 , the discharge capacity of each lap is 2mAhcm -2 , the charging cut-off voltage is 1.0V, it can be seen from the figure that the battery can cycle more than 600 cycles with high cycle effici...

Embodiment 2

[0032] With lithium bisfluorosulfonyl imide as electrolyte, lithium nitrate as passivator, and 1,3-dioxane as solvent, the electrolyte is prepared in a glove box protected by an argon atmosphere, in which bisfluorosulfonyl The concentration of lithium amide is 2.5molL -1 , LiNO 3 The concentration is 0.75molL -1 . Then assemble it into lithium / lithium and lithium / copper button cells (CR2025), and test the cycle efficiency and cycle stability of the lithium metal anode material respectively. The diameter of the lithium sheet is 12mm, and the diameter of the copper sheet is 18mm.

[0033] figure 2 a is the lithium / copper button battery cycle efficiency prepared in this embodiment, and the current density is 3mAcm -2 , the discharge capacity of each lap is 2mAhcm -2 , the charging cut-off voltage is 1.0V, it can be seen from the figure that the battery can cycle about 400 cycles with a high cycle efficiency, and the average Coulombic efficiency is about 98.0%; figure 2 B ...

Embodiment 3

[0035] With lithium bisfluorosulfonyl imide as electrolyte, lithium nitrate as passivator, and 1,3-dioxane as solvent, the electrolyte is prepared in a glove box protected by an argon atmosphere, in which bisfluorosulfonyl The concentration of lithium amide is 2.5molL -1 , LiNO 3 The concentration is 0.75molL -1 . Then assemble into lithium-lithium iron phosphate, lithium-cobaltate lithium, lithium-sulfur button battery (CR2025), the diameter of lithium sheet and positive electrode sheet is 12mm.

[0036] image 3 a is the cycle stability test of the lithium-lithium iron phosphate full battery prepared in this example, and the charge and discharge rate is 0.5C. It can be seen from the figure that the battery has no obvious capacity decay after more than 100 cycles, and the charge and discharge capacity has always remained at 155mAhg -1 Nearby, it shows the good matching of the electrolyte to the lithium iron phosphate cathode and the improvement of the cycle stability of ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
diameteraaaaaaaaaa
diameteraaaaaaaaaa
current efficiencyaaaaaaaaaa
Login to View More

Abstract

The invention discloses a high-concentration bis-fluorosulfonyl lithium imide-lithium nitrate-1, 3-dioxolane electrolyte, a preparation method thereof and a corresponding battery. The electrolyte is a dual electrolyte composed of a bis-fluorosulfonyl lithium imide lithium salt and lithium nitrate-1, 3-dioxolane; the bis-fluorosulfonyl lithium imide lithium salt is used as a lithium ion transmission electrolyte in the electrolyte, meanwhile used as an improvement agent for the lithium metal negative electrode stability, and has the concentration of 2.5-3mol L-1; lithium nitrate is used as a lithium metal negative electrode surface passivation agent and has the concentration of 0.5-0.8 mol L-1; and 1, 3-dioxolane is used as an organic solvent and is used for dissolving the bis-fluorosulfonyl lithium imide lithium salt and lithium nitrate. The electrolyte provided by the invention has a very high effect of inhibiting the formation of lithium dendritic crystals and improving the cycling stability of the negative electrode of the lithium metal. The preparation process disclosed by the invention is simple, the raw materials are low in cost, the energy consumption is low, and the preparation method is suitable for large-scale industrial production and is suitable for lithium metal batteries of various positive materials, such as a lithium-sulfur battery, a lithium-lithium iron phosphate battery, a lithium-lithium nickel cobalt oxide battery and the like.

Description

technical field [0001] The invention relates to the technical field of electrolyte materials for lithium batteries, in particular to a high-concentration lithium bisfluorosulfonyl imide-lithium nitrate-1,3-dioxane electrolyte, a preparation method thereof, and a corresponding battery. Background technique [0002] Since they were first commercialized in 1991, lithium-ion batteries have played an increasingly important role in modern life due to their many advantages. After nearly 30 years of development, its energy density has gradually approached the theoretical ceiling, and further improvement is very difficult. It is necessary to completely innovate the structure of the battery and the corresponding materials, so that it is possible to greatly improve the specific energy of the lithium battery. [0003] In recent years, a variety of new lithium batteries have emerged. The mainstream ones are lithium metal-air (oxygen) batteries, lithium metal-sulfur batteries, and all-so...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0568H01M10/0569H01M10/052
CPCH01M10/052H01M10/0568H01M10/0569H01M2300/0028Y02E60/10
Inventor 张鹏谢健楠金明钢陈丽霞韩改格
Owner HANGZHOU SKYRICH POWER CO LTD