Detection method of lithium hexafluorophosphate solution

A technology of lithium hexafluorophosphate and detection method, which is applied to measurement devices, instruments, scientific instruments, etc., can solve the problems of long detection time, poor operability and practicability, and high detection cost, achieve good operability and practicability, and reduce operation. cost, the effect of prolonging the service life

Active Publication Date: 2013-08-07
DONGGUAN SHANSHAN BATTERY MATERIALS
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AI Technical Summary

Problems solved by technology

The study found that even LiPF 6 The indicators of hydrofluoric acid, moisture, and metal ions detected by the solution are the same, and LiPF from different sources 6 There are still differences in the electrolyte prepared by the solution, such as LiPF 6 Solution-produced electrolyte, with pure solid LiPF 6 Compared with the produced electrolyte, even if the corresponding detection indicators are the same, there are still problems such as strong pungent smell and easy discoloration
Therefore, the detection index of the prior art cannot judge LiPF well 6 The quality of the solution, and the operation of this detection method is very cumbersome, requiring a series of procedures such as moisture analyzer, acid-base titration, filtration, baking, gas chromatography, etc., which makes the detection time-consuming
Furthermore, the direct detection of LiPF 6 The solution will corrode the gas chromatographic separation column, resulting in high testing costs for equipment use and maintenance
Therefore, the operability and practicability of this method are poor, which is unfavorable for LiPF 6 Solution Quality Control

Method used

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  • Detection method of lithium hexafluorophosphate solution
  • Detection method of lithium hexafluorophosphate solution
  • Detection method of lithium hexafluorophosphate solution

Examples

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Effect test

Embodiment 1

[0047] Example 1 LiPF 6 POF in solution 3 Content detection

[0048] 1) Preparation of LiPF 6 the solution

[0049] Sample A: LiPF provided directly by a supplier 6 solution, wherein the organic solvent EMC is 70wt%, LiPF 6 is 30wt%.

[0050] Sample B and sample C respectively use solid LiPF 6 formulated.

[0051] Preparation method:

[0052] In an argon-filled glove box (moisture 6 , and control the temperature of the solution during the addition process not to exceed 30 ° C, after stirring evenly, make LiPF 6 Solution (70wt% EMC, 30wt% LiPF 6 ) set aside for later use.

[0053] 2) POF 3 Assay

[0054] Clean the sealed container in advance and bake it at 120 degrees for 24 hours. When it is needed, install the sample bottle with the 2P connector, connect the vacuum tube of the 2S connector to the 2P connector to vacuum for 20 seconds, close the vacuum valve; then open the nitrogen valve to the sample. Fill the bottle with nitrogen, and repeat the above ...

Embodiment 2

[0066] Example 2 Lithium battery performance test

[0067] 1, using three kinds of LiPF of embodiment 1 6 Solution samples A, B, and C were prepared into LiPF 6 Electrolyte

[0068] In an argon-filled glove box (moisture 6 , The organic solvent is the electrolytic solution of EC:DMC:EMC =1:1:1 (wt%) respectively.

[0069] Wherein respectively adopt the LiPF of embodiment 1 6 The solution samples A, B, and C are prepared, and the organic solvent is prepared with a high-purity solvent (purity is better than 99.99%, and the water content is lower than 10PPM). During the preparation process, the temperature of the solution during the addition process was controlled not to exceed 30°C, and after stirring evenly, the lithium battery electrolytes A1, B1, and C1 were respectively obtained.

[0070] 、 Preparation of lithium battery

[0071] According to the battery manufacturing process, the above-mentioned lithium battery electrolytes A1, B1, and C1 are used to make 454046A750...

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Abstract

The invention relates to the technical field of lithium battery electrolyte detection, particularly to a detection method of a lithium hexafluorophosphate solution. By utilizing a gas chromatograph to detect the content of the volatile component POF3 contained in the gas phase component of the lithium hexafluorophosphate solution, the involvement degree of impurity moisture in a lithium hexafluorophosphate solution generation process can be inferred reversely. The method provided in the invention takes the content of harmful impurity POF3 as a new detection index for evaluating the lithium hexafluorophosphate solution quality, and further judges the lithium salt quality on the basis of hydrofluoric acid, moisture, metal ions and other existing detection technologies. The method provided in the invention has the advantages of simple and rapid operation, low cost, as well as better operability and practicability, thus having vital significance to quality control of lithium battery products.

Description

technical field [0001] The invention relates to the technical field of detection of lithium battery electrolyte, in particular to a detection method of lithium hexafluorophosphate solution. Background technique [0002] Lithium-ion batteries have the characteristics of high energy density, high specific power, good cycle performance, no memory effect, and no pollution. They have been widely used in electronic and digital products, and are also an ideal choice for future electric vehicle energy. [0003] Lithium battery electrolyte is composed of organic solvent and lithium salt electrolyte. The commonly used lithium salt electrolyte is lithium perchlorate (LiClO 4 ), lithium hexafluorophosphate (LiPF 6 ), lithium tetrafluoroborate (LiBF 4 ), etc., where LiPF 6 With good conductivity and electrochemical stability, it is currently the most widely used lithium salt electrolyte. Due to LiPF 6 The quality of the electrolyte directly affects the quality of the electrolyte and...

Claims

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Application Information

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IPC IPC(8): G01N30/02
Inventor 丁祥欢陈斯宗侯建波
Owner DONGGUAN SHANSHAN BATTERY MATERIALS
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