Electrolytes containing six membered ring cyclic sulfates

A cyclic carboxylate, cyclic carbonate technology, applied in electrolytes, circuits, electrical components, etc., can solve the problems of reduced room temperature stability and increased aging of preparations

Pending Publication Date: 2019-07-09
SOLVAY SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, certain organic additives have been associated with unwanted reactions of electrolyte components, leading to reduced room temperature stability and increased aging of formulations

Method used

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  • Electrolytes containing six membered ring cyclic sulfates
  • Electrolytes containing six membered ring cyclic sulfates
  • Electrolytes containing six membered ring cyclic sulfates

Examples

Experimental program
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example 1

[0190] The following example shows the 1,3 propylene sulfate formulation in 1M LiPF 6 , 75 wt% 2,2-difluoroethyl acetate (hereinafter "DFEA"), 25 wt% fluoroethylene carbonate (FEC) with LiBOB and maleic anhydride (MA). The resulting formulation used in this example contained exactly 1M LiPF 6 With 75wt% DFEA + 25wt% FEC (based on the weight of DFEA and FEC) + 0.85wt% LiBOB + 1.5wt% 1,3 propylene sulfate + 0.5wt% MA (based on the weight of the total formulation).

[0191] Electrolyte preparation: Preparation of 2,2-difluoroethyl acetate (DFEA)

[0192] The 2,2-difluoroethyl acetate used in the following examples was obtained by mixing potassium acetate with HCF 2 CH 2 Prepared by Br reaction. The following is the procedure used for this preparation.

[0193] Potassium acetate (Aldrich, Milwaukee, WI, 99%) was dried at 100° C. under vacuum of 0.5-1 mm of Hg (66.7-133 Pa) for 4 to 5 h. The dried material had a water content of less than 5 ppm as determined by Karl-Fischer...

example 2

[0230] The following example describes the preparation of the following composition: 1M LiPF 6 +4:21:75FEC:PC:DFEA (wt% / wt% / wt%, based on the total weight of FEC, PC and DFEA)+0.85wt% LiBOB+1.5wt% 1,3-propylene sulfate+0.5wt %MA (based on weight of total formulation). By mixing 12.8816 g of 2,2-difluoroethyl acetate, 0.6821 g of fluoroethylene carbonate (FEC, BASF Corporation, Independence, Ohio) and 3.6056 g of propylene carbonate (PC, BASF Inc., Independence, Ohio) assembled the electrolyte for this example in a nitrogen-purged drybox. Molecular sieves (3A) were added and the mixture was dried to less than 1 ppm water and filtered through a 0.25 micron PTFE syringe filter.

[0231] 1.9991 g of the above mixture was combined with 0.0233 g of LiBOB. Stir the material gently to dissolve the components. Add 0.0351 g of 1,3-propylene sulfate, 0.0113 g of MA, and 0.2655 g of LiPF 6 (BASF Corporation, Independence, Ohio). The standing material was stirred gently to dissolve t...

example 4

[0251] This example describes the preparation of a 10% by weight solution of 1,3 propylene sulfate in FEC. A mixture containing 10 wt% 1,3 propylene sulfate and 90 wt% fluoroethylene carbonate was allowed to age at 25°C. After thirteen days, the solution was slightly colored, but significantly less colored than the comparative solution with ethylene sulfate shown in Comparative Example D below.

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Abstract

Disclosed herein are electrolyte compositions comprising at least one electrolyte component comprising a cyclic carbonate, such as a fluoroethylene carbonate, and at least one additive comprising a 6-member ring heterocyclic sulfate, such as a 1,3 propylene sulfate. The disclosed electrolyte compositions can comprise additional electrolyte components, such as fluorinated acyclic carboxylic acid esters, and additional additives, such as lithium boron compounds, and cyclic carboxylic acid anhydrides, such as maleic anhydride. The improved battery performances, which include high temperature cycling conditions and/or room temperature stability, make these electrolyte compositions useful in electrochemical cells, such as lithium ion batteries.

Description

[0001] technical field [0002] The disclosure herein relates to electrolyte compositions comprising at least one electrolyte component comprising a cyclic carbonate such as fluoroethylene carbonate and at least one sulfuric acid ester comprising a 6-membered ring heterocycle such as sulfuric acid 1,3 Additive of propylene ester. Improved battery performance, including high temperature cycling conditions and / or room temperature stability, makes these electrolyte compositions useful in electrochemical cells, such as lithium ion batteries. Background technique [0003] Batteries containing electrodes made of alkali metals, alkaline earth metals, or compounds comprising these metals, such as lithium ion batteries, typically contain electrolytes, additives, and non-aqueous solvents for the electrolytes used in these batteries. Additives can enhance battery performance and safety, and therefore a suitable solvent must dissolve the electrolyte as well as the additives. The solven...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/58H01M10/0525H01M10/0567H01M10/0568H01M10/0569
CPCH01M4/505H01M4/525H01M4/5825H01M10/0525H01M10/0567H01M10/0568H01M10/0569H01M2300/0034Y02E60/10H01M2300/0037
Inventor S.伯克哈特K.考塔基斯B.利维-波利斯
Owner SOLVAY SA
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