A kind of non-aqueous lithium-ion battery electrolyte and lithium-ion battery

A lithium-ion battery and electrolyte technology, which is applied in non-aqueous electrolytes, batteries, secondary batteries, etc., can solve the problems of affecting the electrochemical performance of batteries, the increase of electrolyte viscosity, and the decrease of conductivity, so as to compensate for the decrease of conductivity, Effect of improving electrical conductivity and reducing flammability

Active Publication Date: 2022-01-21
ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the viscosity of these flame retardant additives of phosphate esters is relatively high. After adding the electrolyte, the viscosity of the electrolyte will increase and the conductivity will decrease, which will affect the electrochemical performance of the battery (cycle performance and rate performance, etc.)

Method used

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  • A kind of non-aqueous lithium-ion battery electrolyte and lithium-ion battery
  • A kind of non-aqueous lithium-ion battery electrolyte and lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: prepare electrolytic solution in the vacuum drying glove box of moisture content6 The lithium salt concentration is 0.6mol / L, the content of 1,3-propane sultone is 4% of the total weight of the electrolyte, the content of fluoroethylene carbonate is 6% of the total weight of the electrolyte, and the content of adiponitrile The content is 5% of the total weight of the electrolyte, the content of biphenyl is 4% of the total weight of the electrolyte, and the flame retardant additive A is 5% of the total weight of the electrolyte.

Embodiment 2

[0020] Embodiment 2: prepare electrolytic solution in the vacuum drying glove box of moisture content6 The lithium salt concentration is 0.7mol / L, the content of 1,3-propane sultone is 4% of the total weight of the electrolyte, the content of fluoroethylene carbonate is 6% of the total weight of the electrolyte, and the content of adiponitrile The content is 5% of the total weight of the electrolyte, the content of biphenyl is 4% of the total weight of the electrolyte, and the flame retardant additive A is 5% of the total weight of the electrolyte.

Embodiment 3

[0022] Embodiment 3: prepare electrolytic solution in the vacuum drying glove box of moisture content6 The lithium salt concentration is 0.8mol / L, the content of 1,3-propane sultone is 4% of the total weight of the electrolyte, the content of fluoroethylene carbonate is 6% of the total weight of the electrolyte, and the content of adiponitrile The content is 5% of the total weight of the electrolyte, the content of biphenyl is 4% of the total weight of the electrolyte, and the flame retardant additive A is 5% of the total weight of the electrolyte.

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Abstract

The invention provides a non-aqueous lithium-ion battery electrolyte and a lithium-ion battery. The non-aqueous lithium-ion battery electrolyte contains organic solvents, lithium salts, flame retardant additives and other additives, and the flame retardant additive is boric acid lithium phosphate , when the battery is overcharged or encounters extreme high temperature, the flame retardant additive can decompose to generate phosphorus oxygen free radicals and boron oxygen free radicals, and capture hydrogen free radicals or hydroxyl free radicals generated by the electrolyte or electrode materials, thereby playing a role flame retardant effect. The manufactured lithium-ion battery can form dense and stable CEI and SEI films at the interface of the positive and negative electrode materials of the battery. At the same time, the flame retardant additive is a lithium salt, which can improve the conductivity of the electrolyte and has no effect on the electrochemical performance. Negative impact.

Description

[technical field] [0001] The invention belongs to the technical field of battery electrolyte, and in particular relates to a non-aqueous electrolyte of a lithium ion battery and a lithium ion battery. [Background technique] [0002] In recent years, lithium-ion battery technology has developed rapidly, and the energy density of batteries has been continuously refreshed. New energy vehicles driven by lithium-ion batteries have gradually become the development direction of the future automotive industry. Increasing the working voltage of the battery, using high-nickel ternary materials with silicon-carbon anode materials, and lightweight design of battery auxiliary materials can further increase the energy density of the battery, but it also brings great safety hazards. This is mainly because the electrolytes used in lithium-ion batteries currently mainly use carbonate-based organic compounds. These solvents have relatively low boiling points and flash points. When the batteri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0567H01M10/0525H01M2220/20H01M2300/0025Y02E60/10
Inventor 黄秋洁毛冲杨富杰王霹霹梁洪耀戴晓兵
Owner ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS
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