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Low-temperature aqueous ion battery electrolyte and application thereof in aqueous ion battery

An ion battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of deterioration of electrochemical performance and high freezing point, and achieve the effect of excellent effect, excellent low temperature performance and low combustion heat.

Pending Publication Date: 2022-07-01
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a general-purpose low-temperature water-based ion battery electrolyte and its application, to solve the problem that the conventional water-based electrolyte has a high freezing point, which leads to the deterioration of the electrochemical performance of the water-based ion battery under low temperature conditions, so that the assembled water-based ion battery The battery exhibits excellent electrochemical performance at -50°C

Method used

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  • Low-temperature aqueous ion battery electrolyte and application thereof in aqueous ion battery
  • Low-temperature aqueous ion battery electrolyte and application thereof in aqueous ion battery
  • Low-temperature aqueous ion battery electrolyte and application thereof in aqueous ion battery

Examples

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Effect test

Embodiment 1

[0029] Example 1: (low temperature aqueous sodium ion battery)

[0030] Quick Screen H 2 The optimal ratio of O / FA includes the following preparation steps:

[0031] (1) the present invention utilizes low combustion heat and high evaporation heat of FA ( figure 1 ), FA shows a high safety of non-flammability in air ( figure 2 ). In the preparation process, except H 2 O and FA are pure out of phase, according to H 2 O / FA volume ratio to prepare nine mixed reagents (9:1; 8:2; 7:3; 6:4; 5:5; 4:6; 3:7; 2:8;; 1:9), then together with pure phase reagents (pure H 2 O and pure FA) together in a low temperature refrigerator, set different temperatures (-10°C;-20°C;-30°C;-40°C;-50°C;-60°C;), respectively, for a certain period of time ( >2h), observe the state of the above reagents, the specific results are as follows image 3 shown, indicating that when H 2 When the volume ratio of O and FA is 3:7, H 2 O / FA mixed solvent has an ultra-low freezing point (2 The mixed solvent wi...

Embodiment 2

[0037] Example 2: (Low-temperature water-based lithium-ion battery)

[0038] (1) Dissolving lithium bistrifluoromethanesulfonimide (LiTFSI) electrolyte salt in H optimized in Example 1 2 O / FA mixed solvent (H 2 The volume ratio of O and FA is 3:7), which is formulated into a low-temperature aqueous lithium-ion battery electrolyte (LiTFSI) 1 -(H 2 O) 55 -(FA) 58.1 , where LiTFSI, H 2 The molar ratio of O and FA was 1:55:58.1, respectively. The comparative electrolyte is (LiTFSI) 1 -(H 2 O) 55 , where LiTFSI and H 2 The O molar ratios were 1:55, respectively.

[0039] (2) During the assembly process of aqueous lithium-ion batteries, LiMn 2 O 4 Cathode and LiTi 4 O 12 The negative electrode was prepared into a slurry with the conductive agent Ketjen black and the binder PTFE according to the ratio in Example 1, respectively, and was stamped on the current collector titanium mesh, vacuum-dried at 60 °C, and assembled into a water-based lithium-ion battery CR2032. Te...

Embodiment 3

[0040] Example 3 (low temperature aqueous potassium ion battery)

[0041] (1) Potassium trifluoromethanesulfonate (KCF) 3 SO 3 ) electrolyte salt dissolved in the above optimized H 2 In O / FA mixed solvent, it is prepared into low temperature aqueous potassium ion battery electrolyte (KCF 3 SO 3 ) 2.2 -(H 2 O) 5.5 -(FA) 5.81 , where KCF 3 SO 3 , H 2 The molar ratio of O and FA was 2.2:5.5:5.81, respectively. The comparative electrolyte is (KCF 3 SO 3 ) 2.2 -(H 2 O) 5.5 , where KCF 3 SO 3 with H 2 The molar ratio of O was 2.2:5.5, respectively.

[0042] (2) Prussian blue analog cathode (K 2 MnFe(CN) 6 ) and the organic PNTCDA negative electrode were prepared into a slurry with a conductive agent (Super P) and a binder (PTFE) according to the proportions in Example 1, respectively, and were punched into the current collector titanium mesh, vacuum-dried at 60 °C, and assembled into an aqueous potassium ion battery CR2016. The test results show that at -50℃, u...

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Abstract

The invention discloses a low-temperature aqueous ion battery electrolyte and application thereof in an aqueous ion battery. According to the invention, by adjusting the ratio of H2O to the strong-polarity organic solvent (FA), the obtained H2O / FA mixed solvent has an ultra-low freezing point (lt; the temperature is-50 DEG C and is far lower than that of single-component H2O (0 DEG C) and FA (-2 DEG C). Corresponding electrolyte salt is dissolved in the obtained mixed solvent to prepare the low-temperature electrolyte of the corresponding aqueous ion battery, the low-temperature electrolyte and different positive and negative electrode materials are assembled into various aqueous ion batteries, and excellent performance is obtained under the low-temperature condition. The electrolyte disclosed by the invention is simple in formula, low in cost, universal and suitable for the field of large-scale energy storage. In addition, according to the technical scheme, the application range of the water-based ion battery in a low-temperature environment can be effectively widened on the basis that the advantages of the water-based ion battery are not influenced.

Description

technical field [0001] The invention belongs to the field of energy storage and conversion, and particularly relates to the preparation and regulation of electrolytes for low-temperature aqueous ion batteries. Background technique [0002] Compared with organic ion battery systems, aqueous ion batteries have a series of unique advantages, such as high safety, easy assembly, low price, high ionic conductivity, and environmental friendliness. Therefore, water-based ion batteries are expected to be applied to large-scale energy storage grid systems. However, the high freezing point (0°C, 1 atm) of water makes the aqueous electrolyte easy to freeze under low temperature conditions, resulting in a sharp decline in the electrochemical performance of aqueous ion batteries in cold environments, which will greatly affect the performance of aqueous ion batteries in severe cold seasons. and normal use in high latitude countries. At the same time, the viscosity of the aqueous electrol...

Claims

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Application Information

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IPC IPC(8): H01M10/36
CPCH01M10/36H01M2300/0002
Inventor 焦丽芳朱坤杰
Owner NANKAI UNIV
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