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A high -energy density lithium ion battery electrolyte and its application

A lithium-ion battery, high energy density technology, used in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve the problems of cycle performance and safety performance decline, and achieve improved cycle performance, small thickness expansion, improved Effects of Cyclic Stability

Active Publication Date: 2022-05-24
SHANDONG HIRONG POWER SUPPLY MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] High-energy-density electrode materials, such as nickel-cobalt-manganese ternary cathode materials, have problems such as reduced cycle performance and safety performance when they are matched with current conventional electrolyte systems.

Method used

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  • A high -energy density lithium ion battery electrolyte and its application
  • A high -energy density lithium ion battery electrolyte and its application
  • A high -energy density lithium ion battery electrolyte and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Under nitrogen airtight protective atmosphere, moisture <10ppm, take the solvent ethylene carbonate (EC), ethyl methyl carbonate (EMC) and diethyl carbonate (DEC) in a mass ratio of 1:1:1 and then add and mix them, using a condenser Cool the mixed solution to ensure that the temperature is not higher than 10 °C, slowly add lithium hexafluorophosphate to ensure that the lithium salt concentration is 1.2 mol / L, and then add 1,3-propane sultone (PS) with a film-forming additive mass fraction of 1.5%. and 1% fluoroethylene carbonate (FEC), finally adding 0.5% bis(trimethylsiloxy)cyclobutene and 2% 1,4-dioxa-spiro[4,5] Dec-7-ene-8-boronic acid pinacol continued to stir until the solution became clear.

Embodiment 2

[0035] The difference from Example 1 is that the amount of functional additives added is different. The mass fraction of 1% bis(trimethylsiloxy)cyclobutene and 2% of 1,4-dioxa-spiro[4,5 ] Dec-7-ene-8-boronic acid pinacol ester and continue stirring until the solution becomes clear.

Embodiment 3

[0037] The difference from Example 1 is that the amount of functional additives added is different. The mass fraction of 1.5% bis(trimethylsiloxy)cyclobutene and 2% of 1,4-dioxa-spiro[4,5 ] Dec-7-ene-8-boronic acid pinacol ester and continue stirring until the solution becomes clear.

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Abstract

The invention provides a high energy density lithium ion battery electrolyte and its application, wherein the electrolyte includes non-aqueous solvent, electrolyte lithium salt, functional additives, and other additives, wherein the functional additives are silicone-based Additives and borate ester additives, the silicone additives include one or a mixture of the following: The borate additives include one or a mixture of the following: Through the technical solution of the present invention, the silicone additives Used in combination with borate ester additives, they work synergistically to form a stable low-resistance interface film on the electrode surface, improving the cycle stability of high-energy-density lithium batteries. This electrolyte can be applied to high-nickel materials and silicon-carbon materials as positive materials. For batteries with negative electrodes, the storage performance of the battery has been effectively improved, the expansion of battery thickness has been effectively suppressed, and the overall safety performance of the battery has been improved.

Description

Technical field [0001] The present invention relates to the technical field of lithium-ion battery electrolytes, and specifically to a high-energy-density lithium-ion battery electrolyte and its application. Background technique [0002] As one of the most important electrochemical energy storage devices currently, lithium-ion batteries have been used in small-capacity batteries in consumer electronics and power tools, and have gradually expanded to new energy electric vehicles, electric ships, electric aircraft, robots, etc. Emerging fields, these fields not only require greater capacity of lithium-ion batteries, but also continue to put forward higher requirements for their energy density. Initially, the energy density of lithium-ion batteries commercialized by Sony in 1991 was only 80W·h / kg; now, the energy density of lithium-ion batteries has reached 300W·h / kg. [0003] High-energy-density electrode materials, such as nickel-cobalt-manganese ternary cathode materials, h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235Y02E60/10
Inventor 孙建勇林红赵卫民刘永王彭丽郭庆元
Owner SHANDONG HIRONG POWER SUPPLY MATERIAL
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