Local high-concentration flame-retardant electrolyte, lithium battery and preparation method of lithium battery

An electrolyte and high-concentration technology, used in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, lithium batteries, etc., can solve the problems of low wettability of the diaphragm, high viscosity, and unstable negative electrode.

Inactive Publication Date: 2020-09-15
SHENZHEN INST OF ADVANCED TECH
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to improve the safety performance of lithium batteries, esters such as trimethyl phosphate (TMP) and triethyl phosphate (TEP) can be directly used as electrolytes to improve the flame retardancy of the electrolyte, but the viscosity of this type of electrolyte is very high, which is harmful to the diaphragm. The wettability is too low and unstable to the negative electrode

Method used

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  • Local high-concentration flame-retardant electrolyte, lithium battery and preparation method of lithium battery
  • Local high-concentration flame-retardant electrolyte, lithium battery and preparation method of lithium battery
  • Local high-concentration flame-retardant electrolyte, lithium battery and preparation method of lithium battery

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preparation example Construction

[0029] like figure 1 As shown, a method for preparing a local high-concentration flame-retardant electrolyte according to an embodiment, the preparation method for the local high-concentration flame-retardant electrolyte includes the following steps:

[0030] S110: A basic electrolyte is formed by mixing the lithium salt and the flame retardant electrolyte.

[0031] In some of these embodiments, the lithium salt is selected from lithium bis(fluorosulfonyl)imide (LiFSI), lithium bistrifluoromethanesulfonimide (LiTFSI), and lithium bisoxalatoborate (LiBOB). at least one.

[0032] It can be understood that high-quality lithium salts have a great impact on the energy density, power density, wide electrochemical window, cycle life, safety performance, etc. of lithium batteries. By selecting the above lithium salts, the energy density and power of lithium batteries can be improved. Density, wide electrochemical window, cycle life and safety performance.

[0033] In some embodimen...

Embodiment 1

[0052] The local high-concentration electrolyte provided by this embodiment includes the following components in a weight ratio: 84.24% of the base electrolyte, 15.76% of the base electrolyte formed by LiFSI, in the base electrolyte, the mole fraction of lithium bisfluorosulfonimide is 1 mol / L.

[0053] The preparation method of the local high-concentration electrolyte in this embodiment is as follows:

[0054] Dissolve 0.187 g of LiTFSI in 1 mL of TMP solution, and stir at room temperature for 0.5 h until the LiTFSI is completely dissolved to form a base electrolyte of high-concentration lithium salt. In the base electrolyte, the molar concentration of lithium bisfluorosulfonimide is is 1 mol / L.

[0055] 2 mL of HFE was added to the above basic electrolyte, and stirred at room temperature for 0.5 h until uniformly mixed to obtain a flame retardant electrolyte.

Embodiment 2

[0057] The local high-concentration electrolyte provided in this embodiment includes the following components in a weight ratio: 68.14% of the base electrolyte, 15.76% of the base electrolyte formed by LiTFSI, in the base electrolyte, the mole fraction of lithium bisfluorosulfonimide is 5mol / L.

[0058] The preparation method of the local high-concentration electrolyte in this embodiment is as follows:

[0059] Dissolve 0.935 g of LiTFSI in 1 mL of TTE solution, and stir at room temperature for 0.5 h until the LiTFSI is completely dissolved to form a base electrolyte of high-concentration lithium salt. In the base electrolyte, the molar concentration of LiTFSI is 5 mol / L.

[0060] 2 mL of TTE was added to the above basic electrolyte, and stirred at room temperature for 0.5 h until uniformly mixed to obtain a flame retardant electrolyte.

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Abstract

The invention provides a local high-concentration flame-retardant electrolyte. A lithium salt and a flame-retardant electrolyte are mixed to form a basic electrolyte; a local high-concentration electrolyte diluent and the basic electrolyte solvent are fixed to form a local high-concentration flame-retardant electrolyte, by adopting the local high-concentration flame-retardant electrolyte, the flame retardance of the electrolyte can be effectively improved, the coulombic efficiency is high under the current density of 1mAh cm<-2>, the electrolyte can be stably circulated for 125 circles, and the local high-concentration flame-retardant electrolyte is simple in preparation process, wide in raw material source, low in cost and suitable for industrial production. The local high-concentration flame-retardant electrolyte can be used for preparing a lithium battery, the oxidation-reduction stability of the electrolyte can be improved, the viscosity of the electrolyte is reduced, and the electrolyte is stable to lithium metal.

Description

technical field [0001] The invention relates to the technical field of battery preparation, in particular to a local high-concentration flame-retardant electrolyte, a lithium battery and a preparation method thereof. Background technique [0002] With the large-scale application of lithium batteries, safety issues are the main obstacle to the large-scale commercialization of lithium-ion batteries. Compared with the existing electrolyte systems, it is particularly important to develop safer and more reliable electrolyte systems. Such electrolytes include flame retardant electrolytes, solid electrolytes, and ionic liquid electrolytes. Flame retardant electrolytes are usually obtained by adding flame retardants to conventional electrolytes. [0003] In order to improve the safety performance of lithium batteries, esters such as trimethyl phosphate (TMP) and triethyl phosphate (TEP) can be directly used as electrolytes to improve the flame retardancy of electrolytes. The wett...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/052H01M10/058
CPCH01M10/0565H01M10/052H01M10/058H01M2300/0082Y02E60/10Y02P70/50
Inventor 刘国华陆子恒陈佳华李诚杨春雷
Owner SHENZHEN INST OF ADVANCED TECH
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