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A lithium ion battery electrolyte and a lithium ion battery containing the electrolyte

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of unsatisfactory battery cycle life, poor battery high and low temperature performance, etc., and achieve the effects of inhibiting free migration and reduction, reducing damage, and improving cycle stability.

Active Publication Date: 2022-06-28
SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the high and low temperature performance of the battery is poor
The disadvantage is that the cycle life of the battery is still not ideal

Method used

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  • A lithium ion battery electrolyte and a lithium ion battery containing the electrolyte
  • A lithium ion battery electrolyte and a lithium ion battery containing the electrolyte
  • A lithium ion battery electrolyte and a lithium ion battery containing the electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Preparation of electrolyte: In an argon-filled glove box (moisture 6 ), stir until it is completely dissolved, then add vinylene carbonate, fluoroethylene carbonate, lithium difluorophosphate, diethoxyphosphine isocyanate, 1,2-bis(difluorophosphoryloxy)ethane ( DFPO), vinyl sulfate and 1,3-propane sultone. After stirring uniformly, the lithium ion battery electrolyte of Example 1 was obtained. Among them, the mass percentage of lithium hexafluorophosphate in the electrolyte is 13.5%, the mass percentage of lithium difluorophosphate in the electrolyte is 1%, and the mass percentage of vinylene carbonate in the electrolyte is 0.3%, The mass percentage of fluoroethylene carbonate in the electrolyte is 1%, the mass percentage of 1,2-bis(difluorophosphine)ethane in the electrolyte is 1%, and the mass percentage of diethoxyisocyanurate is 1%. The mass percentage of phosphonate in the electrolyte is 0.2%, the mass percentage of vinyl sulfate in the electrolyte is 1.5%, and th...

Embodiment 2-21

[0070] Examples 2-21 are also specific examples of electrolyte preparation. Except for the parameters in Table 1, other parameters and preparation methods are the same as those in Example 1. The electrolyte formula is shown in Table 1.

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Abstract

The invention discloses a lithium-ion battery electrolyte, which comprises a non-aqueous organic solvent, a lithium salt and an additive. According to the mass percentage in the lithium-ion battery electrolyte, the additive is composed of: 1,2-bis(difluorophosphorus Oxygen) ethane 0.1-2%, isocyanate compounds 0.2-2%, cyclic sulfur-containing compounds 0.5-3%, lithium salt additives 1-3.5%, other additives 0.2-15%. The invention also discloses a lithium ion battery comprising a positive pole, a separator, a negative pole and the lithium ion battery electrolyte. The lithium-ion battery electrolyte of the present invention can realize the ternary high-nickel or high-voltage system with good cycle stability and high and low temperature performance by organically combining various components, and can slow down the growth of the internal resistance of the battery during use Speed, has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery electrolyte and a lithium ion battery containing the electrolyte. Background technique [0002] High energy density ternary lithium-ion battery is the main development and application direction of power battery and energy storage products. At present, improving the capacity density is mainly to increase the proportion of nickel in the positive electrode material or to increase the working upper limit voltage of the positive electrode material. The increase of the nickel content or the increase of the working voltage will increase the thermal instability of the battery material, and the side reactions between the positive electrode material and the electrolyte will increase, which will easily cause gas production during high-temperature storage or cycling of the battery. When using the power battery, considering the complex applicat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/058
CPCH01M10/0525H01M10/0567H01M10/058Y02E60/10Y02P70/50
Inventor 朱学全郭力
Owner SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD