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Method for controlling temperature of battery comprising lithium salt

A technology for batteries and unit cells, applied in the temperature field of batteries, can solve problems such as harmful contributions to the greenhouse effect, and achieve the effects of improved life, high ionic conductivity, and good temperature.

Pending Publication Date: 2022-07-22
ARKEMA FRANCE SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, a large number of HFC fluids, including HFC-134a, may contribute deleteriously to the greenhouse effect

Method used

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  • Method for controlling temperature of battery comprising lithium salt
  • Method for controlling temperature of battery comprising lithium salt
  • Method for controlling temperature of battery comprising lithium salt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0294] Examples 1 and 2 - Preparation of LiFSI (according to the present invention)

[0295] At the end of the process described in WO2015 / 158979, a crude LiFSI solution in butyl acetate was obtained. The LiFSI solution is purified by liquid-liquid extraction of the salt with deionized water to form an aqueous solution, followed by liquid-liquid extraction of the lithium bis(fluorosulfonyl)imide salt from the aqueous solution with butyl acetate . The resulting solution is subjected to a concentration stage to produce a composition comprising more than 30% by weight of dry extract, characterized in that the extract contains more than 99.75% by weight of LiFSI and a total weight content of chloride, sulfate and fluoride ions Strictly greater than 0 and less than 500 ppm. The composition was then subjected to crystallization and filtration stages to produce the LiFSI of Example 1 .

[0296] The LiFSI of Example 2 was obtained according to a similar method.

Embodiment 3

[0297]Example 3 - Preparation of LiFSI (comparison)

[0298] At the end of the process described in WO2015 / 158979, a crude LiFSI solution in butyl acetate was obtained. Purification of the LiFSI solution comprising liquid-liquid extraction of the salt with deionized water to form an aqueous solution, followed by liquid-liquid extraction of the lithium bis(fluorosulfonyl)imide salt from the aqueous solution with butyl acetate . The resulting solution is subjected to a concentration stage to produce a composition comprising a dry extract characterized in that the extract contains less than 99.75 wt% LiFSI and has a total weight content of chloride, sulfate and fluoride strictly greater than 600 ppm.

[0299] The composition was then subjected to crystallization and filtration stages to produce the LiFSI of Example 3.

Embodiment 4

[0300] Example 4 - Characterization

[0301] Cyclic voltammetry tests were performed. For this, a CR2032 coin cell was fabricated, which was equipped with an aluminum plate with a diameter of 20 mm as the working electrode, a lithium metal pellet with a diameter of 8 mm as the reference electrode, and a glass fiber separator with a diameter of 18 mm, which was soaked with 12 drops (0.6 ml) of different compositions of 1 mol / l LiFSI solutions in a solvent mixture consisting of ethylene carbonate and ethyl methyl carbonate (CAS=623-53-0) in a volume ratio of 3 / 7.

[0302] Subsequently, a voltage sweep was performed at the terminals of the 4.5V coin cell. Two preliminary scans are performed to enable the formation of passivation layers (eg SEI and passivation of aluminum). Subsequently, the resulting 4.5 V oxidation current (after two scans) was measured and recorded. The values ​​are as follows:

[0303] [Table 2]

[0304]

[0305] The observed oxidation currents can ref...

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Abstract

The invention relates to a method for controlling the temperature of a battery in an electric or hybrid vehicle by means of a system comprising a vapour compression circuit in which a first heat transfer composition flows and a secondary circuit in which a second heat transfer composition flows, said method involving:-heat exchange between the battery and the second heat transfer composition; -heat exchange between the second heat transfer composition and the first heat transfer composition; wherein the battery comprises at least one electrochemical cell having a negative electrode, a positive electrode and an electrolyte comprising a lithium salt composition comprising:-at least 99.75 wt.%, preferably at least 99.85 wt.%, advantageously at least 99.95 wt.%, even more advantageously 99.99 wt.%, of a lithium bis (fluorosulfonyl) imide salt; -chloridion Cl-having a mass content strictly less than 20 ppm; wherein the total mass content of the chloride ion Cl <->, the fluorine ion F <-> and the sulfate radical SO4 < 2-> is preferably less than or equal to 150ppm. The invention also relates to a system for carrying out said method.

Description

technical field [0001] The invention relates to a method for regulating the temperature of a battery of a motor vehicle, and also to a device suitable for implementing the method. Background technique [0002] The battery of an electric or hybrid vehicle has maximum efficiency under certain conditions of use, and especially within a very specific temperature range. Maximum efficiency means high available instantaneous power, high available total capacity, and increased battery life. The maximum efficiency of the battery thus enables not only better vehicle performance and autonomy, but also lower vehicle energy consumption per kilometer. [0003] Furthermore, during operation of an electric or hybrid vehicle, the temperature of the battery increases and must always be kept below 60°C, preferably below 40°C, to avoid premature battery aging and even damage. When the temperature is lower than 15°C, the capacity (charge) of the battery will decrease due to the increase in int...

Claims

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Application Information

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IPC IPC(8): H01M10/052H01M10/0561H01M10/0568H01M10/613H01M10/625F25B25/00C09K5/04F25B29/00H01M10/6552H01M10/6569B60H1/00H01M10/66C09K5/00
CPCH01M10/052H01M10/625H01M10/6569H01M10/6552H01M2220/20H01M2300/002H01M10/0561H01M10/613H01M10/66C09K5/00F25B29/00H01M10/0568F25B25/005C09K5/044C09K5/045B60H1/00278B60H2001/00307B60H1/32281Y02E60/10
Inventor G.施密特
Owner ARKEMA FRANCE SA
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