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Non-aqueous lithium ion battery electrolyte and lithium ion battery

A lithium-ion battery and electrolyte technology, applied in non-aqueous electrolytes, batteries, secondary batteries, etc., can solve the problems of decreased conductivity, affecting the electrochemical performance of batteries, and high viscosity

Active Publication Date: 2019-07-02
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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  • Non-aqueous lithium ion battery electrolyte and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0022] 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

[0024] 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

[0026] 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 an organic solvent, a lithium salt, a flame-retardant additive and other additives. The flame-retardant additive is a lithium borate phosphate salt. When a battery is overcharged or encounters extreme high temperature, the flame-retardant additivecan decompose to generate phosphorus oxygen radicals and boron oxygen radicals, and captures the hydrogen radicals or hydroxyl radicals generated by the electrolyte or an electrode material, therebyachieving a flame-retardant effect. The prepared lithium ion battery can form dense and stable CEI and SEI films at an interface between the positive and negative materials of the battery. The flame-retardant additive is a lithium salt, can increase the conductivity of the electrolyte and has no negative impact on electrochemical performance.

Description

[0001] [technical field] [0002] 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. [0003] [Background technique] [0004] 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. W...

Claims

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Application Information

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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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