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Method for detecting free acids in boracic lithium salt and electrolyte of boracic lithium salt

A detection method and free acid technology, applied in the direction of electrochemical variables of materials, etc., can solve the problem of inability to realize the detection of free acid of boron-containing lithium salt and its electrolyte, and achieve the effect of low cost and simple operation.

Inactive Publication Date: 2014-03-19
DONGGUAN SHANSHAN BATTERY MATERIALS
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  • Summary
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] It is precisely because boron-containing lithium salts will decompose to produce acids when they encounter water and alcohol, so the current conventional ice-water acid-base titration method and non-aqueous acid-base titration method using alcohol as solvent cannot realize the boron-containing lithium salt and alcohol. Free acid detection of its electrolyte

Method used

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  • Method for detecting free acids in boracic lithium salt and electrolyte of boracic lithium salt
  • Method for detecting free acids in boracic lithium salt and electrolyte of boracic lithium salt
  • Method for detecting free acids in boracic lithium salt and electrolyte of boracic lithium salt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: Detection of free acid content in lithium difluorooxalate borate.

[0029] A. Configure 0.01mol / L triethylamine-propylene carbonate standard solution:

[0030] Accurately weigh 1.01g (accurate to 0.0001g) of triethylamine, add propylene carbonate solvent to constant volume into a 1000ml volumetric flask, and calibrate its true concentration with benzoic acid reference substance.

[0031] B. Detection of free acid in lithium difluorooxalate borate:

[0032] Accurately weigh 2g of lithium difluorooxalate borate sample (accurate to 0.001g), dissolve in 50ml of high-purity propylene carbonate solvent, stir in a titration cup, and use triethylamine-propylene carbonate with a concentration of 0.01mol / L For the ester standard titration solution, use a Metrohm automatic potentiometric titrator with a PH glass composite electrode, start the automatic titration of the instrument, stop the titration after the test is completed, and calculate the result according to the...

Embodiment 2

[0046] Example 2: Detection of free acid content in lithium bisoxalate borate.

[0047] In this example, the method of Example 1 is adopted, and lithium difluorooxalate borate is replaced with lithium bisoxalate borate, and other steps are identical.

[0048] The examination result of free acid in bisoxalate lithium borate is as shown in table 3:

[0049] Table 3. Content of free acid in lithium bisoxalate borate

[0050]

[0051] The recovery rate test result is as shown in table 4:

[0052] Table 4. Recovery test results

[0053]

Embodiment 3

[0054] Example 3: Detection of free acid content in lithium tetrafluoroborate.

[0055] In this example, the method of Example 1 is adopted, and the lithium difluorooxalate borate is replaced with lithium tetrafluoroborate, and the other steps are exactly the same.

[0056] The examination result of free acid in lithium tetrafluoroborate is as shown in table 5:

[0057] Table 5. Content of free acid in lithium tetrafluoroborate

[0058]

[0059] The recovery rate test result is as shown in table 6:

[0060] Table 6. Recovery test results

[0061]

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Abstract

The invention relates to the technical field of lithium ion battery electrolytes, and in particular relates to a method for detecting free acids in boracic lithium salt and an electrolyte of the boracic lithium salt. In the method, the content of the free acids in a sample is measured by using a non-water potential titration method. Compared with the prior art, the method has the advantages that the problem that no titration point is obtained as acids are generated when boracic lithium salt encounters water and alcohol is avoided, an organic ester is selected as a solvent, and the used solvent is prevented from participating in reaction in the titration process, is stable and undecomposed, and at the same time has certain intermiscibility with a titration agent and the sample to be measured, so that the content of the free acids can be rapidly and accurately detected; the method is simple in operate and low in cost, and is applicable to quantitative analysis on the free acids in the boracic lithium salt and the electrolyte of the boracic lithium salt.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery electrolyte, in particular to a boron-containing lithium salt and a method for detecting free acid in the electrolyte. Background technique [0002] Lithium-ion battery electrolyte is an important part of lithium-ion batteries. As lithium-ion batteries are more and more widely used in various fields such as digital, model aircraft, energy storage, and power, more requirements are placed on the electrolyte. Due to the good thermal stability of boron-containing lithium salts, boron-containing lithium salts such as lithium difluorooxalate borate, lithium bisoxalate borate, lithium tetrafluoroborate, etc. are usually added to the electrolyte, so as to better improve the performance of lithium ions. The thermal stability, chemical stability and high and low temperature performance of the battery. [0003] A small amount of free acid in the electrolyte of lithium-ion batteries will have a g...

Claims

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Application Information

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IPC IPC(8): G01N27/26
Inventor 廖红伟周小华
Owner DONGGUAN SHANSHAN BATTERY MATERIALS
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