Unlock instant, AI-driven research and patent intelligence for your innovation.

Sulfate radical detection method for electrolyte solvent for lithium ion battery

A lithium-ion battery and detection method technology, applied in the chemical industry, can solve problems such as difficulty in sulfate radical detection, and achieve the effects of high sensitivity, good reproducibility, and simple operation

Inactive Publication Date: 2021-09-28
江苏思派新能源科技有限公司
View PDF5 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the invention is to solve the problem in the prior art that the sulfate radical detection of electrolyte solvent for lithium ion batteries is difficult, and a kind of sulfate radical detection method for electrolyte solvent for lithium ion batteries proposed

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0036] A kind of sulfate radical detection method that is used for lithium-ion battery electrolyte solvent, comprises the following steps:

[0037] S1. Prepare materials; prepare the following raw materials:

[0038] Ethanol aqueous solution, barium chloride aqueous solution, sulfate ion standard solution, electrolyte solvent without sulfate radical; wherein ethanol aqueous solution: m 乙醇 :m 水 =1:1; barium chloride aqueous solution: 0.5mol / L, (pH=1); sulfate ion standard solution: c(SO 4 2- )=100ppm; the electrolyte solvent is the electrolyte solvent through repeated ultrapure water extraction and rectification treatment.

[0039] S2, prepare standard solution

[0040] Prepare multiple groups of reaction solutions with different sulfate content:

[0041] 1), the reaction solution of 1ppm sulfate radical

[0042] Add 50ml of sulfate-free electrolyte solvent into a 100ml volumetric flask, accurately add 1g of sulfate radical standard solution, then add 5ml of barium chlori...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a sulfate radical detection method for an electrolyte solvent for a lithium ion battery, which comprises the following steps: preparing materials, preparing a standard solution, detecting the turbidity of the standard solution, obtaining a standard curve, preparing a to-be-detected sulfate radical sample solution, detecting the turbidity value of the to-be-detected sample solution, and comparing the turbidity value of the to-be-detected sample solution with the standard curve to obtaing the content of sulfate radicals. The raw materials comprise an ethanol aqueous solution, a barium chloride aqueous solution, a sulfate ion standard solution and an electrolyte solvent without sulfate radicals. The method has the advantages that the sample containing trace sulfate radicals is converted into the turbid liquid of the barium sulfate under the acidic medium, the turbidity is detected through the turbidity meter, the content of the sulfate radicals is calculated through the turbidity-sulfate radical content curve, the sample to be detected does not need a complex pretreatment process, operation is simple, detection is conducted through an instrument, the sensitivity is high, and the reproducibility is good.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for detecting sulfate radicals used in electrolyte solvents for lithium-ion batteries. Background technique [0002] The electrolyte solvent for lithium-ion batteries requires very low sulfate content (≤10ppm). The current detection methods include visual turbidimetry and ion chromatography; The root ions generate insoluble barium sulfate, which is in a suspended state, and the sulfate content is judged by the visual method and the turbidity of the comparison standard solution. The detection limit of this method is high, and it is difficult to visually distinguish the turbidity of the solution turbidity of sulfate ion <5ppm, and this method is mainly limited by the visual resolution of the testers, and the reproducibility between different testers is poor; The detection sensitivity of chromatography is very high, and the detection limit can reach the ppb le...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G01N21/49G01N1/40G01N1/28
CPCG01N21/49G01N1/4055G01N1/28G01N2001/4061
Inventor 吴雷雷祝秀林黄金豆张丹阳
Owner 江苏思派新能源科技有限公司