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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PUM

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Abstract

The invention provides a high energy density lithium-ion battery electrolyte and its application, wherein the electrolyte includes a non-aqueous solvent, an electrolyte lithium salt, a functional additive, and other additives, wherein the functional additive is silicon-oxygen Additives and borate additives, the silicon-oxygen additives include one or more of the following: the borate additives include one or more of the following: through the technical solution of the present invention, the silicon-oxygen additives Used in combination with boric acid ester additives, the synergistic effect forms a stable low-impedance interface film on the electrode surface, improving the cycle stability of high-energy-density lithium batteries. For the negative electrode battery, the storage performance of the battery has been effectively improved, the expansion of the battery thickness has been effectively suppressed, and the safety performance of the battery has been improved as a whole.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery electrolyte, in particular, to a high energy density lithium ion battery electrolyte and an application thereof. Background technique [0002] As one of the most important electrochemical energy storage devices, lithium-ion batteries have gradually expanded from the application of small-capacity batteries in consumer electronics and power tools to new energy electric vehicles, electric ships, electric aircraft, robots, etc. Emerging fields, these fields not only require lithium-ion batteries to have a larger capacity, 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, have pro...

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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