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Electrolyte composition and use thereof in lithium-ion batteries

A composition and electrolyte technology, applied in the field of battery packs and electrolyte compositions containing lithium ions, can solve problems such as current collector corrosivity

Inactive Publication Date: 2019-10-25
HYDRO QUEBEC CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of LiTFSI is that it is corrosive to the current collector, especially the current collector of aluminum

Method used

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  • Electrolyte composition and use thereof in lithium-ion batteries
  • Electrolyte composition and use thereof in lithium-ion batteries
  • Electrolyte composition and use thereof in lithium-ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0118] The first example carried out involved placing a LiPF containing LiPF at room temperature 6 and LiTDI (or LiPF alone 6 As a reference) the salt mixture is dissolved in the mixture of three carbonates with a total concentration of 1mol / L: the weight ratio of EC / DEC / FEC is respectively: 36.84%, 61.16% and 2% ethylene carbonate (EC) , diethyl carbonate (DEC) and fluoroethylene carbonate (FEC).

[0119] Four mixtures were therefore prepared in this example in the following proportions:

[0120] -1mol / L LiPF 6

[0121] -0.95mol / L LiPF 6 and 0.05mol / L LiTDI

[0122] -0.9mol / L LiPF 6 and 0.1mol / L LiTDI

[0123] -0.8mol / L LiPF 6 and 0.2mol / L LiTDI

[0124] These mixtures were electrochemically evaluated in a 11.5 mAh capacity Li-ion pouch cell with NMC and graphite as cathode and anode materials, respectively. The end-of-cycle voltage of this system is 2.8-4.2V. After a slow conversion to (C / 24) at room temperature, the mixture was evaluated at 45°C with charge and d...

Embodiment 2

[0126] The second example carried out involved placing LiPF at room temperature 6 and LiTDI (or LiPF alone 6 As a reference) the salt mixture is dissolved in the mixture of three carbonates with a total concentration of 1mol / L: the weight ratio is respectively 36.84%, 61.16% and 2% ethylene carbonate (EC), diethyl carbonate ( DEC) and fluoroethylene carbonate (FEC).

[0127] Prepare the following four mixtures:

[0128] -1mol / L LiPF 6

[0129] -0.95mol / L LiPF 6 and 0.05% mol / L LiTDI

[0130] -0.9mol / L LiPF 6 and 0.1mol / L LiTDI

[0131] -0.7mol / L LiPF 6 and 0.3mol / L LiTDI

[0132] These mixtures were electrochemically evaluated in a 11.5 mAh capacity Li-ion pouch cell with NMC and graphite as cathode and anode materials, respectively. The end-of-cycle voltage of this system is 2.8-4.2V. After slow conversion to (C / 24) at room temperature, charge at C / 4 at 60°C, then apply a constant voltage of 4.2V for 1 hour, and then discharge at C / 4 to evaluate the mixture. figu...

Embodiment 3

[0134] will contain LiPF 6 and LiTDI (or LiPF alone 6 As a reference) the salt mixture is dissolved in the mixture of three carbonates with a total concentration of 1mol / L: the weight ratio is respectively 36.84%, 61.16% and 2% ethylene carbonate (EC), diethyl carbonate ( DEC) and fluoroethylene carbonate (FEC).

[0135] In this example three mixtures were prepared in the following proportions:

[0136] -1mol / L LiPF 6

[0137] -0.95mol / L LiPF 6 and 0.05mol / L LiTDI

[0138] -0.8mol / L LiPF 6 and 0.2mol / L LiTDI

[0139] These mixtures were electrochemically evaluated in a 10 mAh capacity Li-ion pouch battery with LFP and graphite as cathode and anode materials, respectively. For the cathode, the electron conductor used is a mixture of carbon black with carbon fibers or nanotubes. The cycle termination voltage of this system is 2-4V. After slow conversion to (C / 24) at room temperature, charge at C at 25, 40 and 60°C, then apply a constant voltage of 4V for 30 minutes, an...

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Abstract

The invention relates to electrolyte compositions comprising lithium hexafluorophosphate, lithium 4,5-dicyano-2-(trifluoromethyl)imidazolate, a solvent and at least one electrolytic additive. The present application also describes the use of said electrolyte compositions in batteries, e.g. within a temperature range greater than or equal to 25 DEG C.

Description

[0001] related application [0002] This application claims priority under applicable law to Canadian Patent Application No. 2960489, filed March 10, 2017, and French Patent Application No. 1751971, filed March 10, 2017, the contents of which are incorporated herein by reference in their entirety for all Purpose. technical field [0003] The present application relates to the field of batteries, and more particularly to the field of electrolyte compositions comprising lithium ions. [0004] technical background [0005] A lithium-ion battery pack contains at least a negative electrode (anode), a positive electrode (cathode), a separator, and an electrolyte. The electrolyte usually consists of a lithium salt dissolved in a solvent, usually a mixture of organic carbonates, in order to have a good compromise between viscosity and dielectric constant. Additives can then be added to improve the stability of the electrolyte salt. [0006] The most commonly used salt is LiPF 6 (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/052H01M10/0568H01M10/0569C07D233/90
CPCC07D233/93H01M10/052H01M10/0568H01M10/0569H01M2300/0028Y02E60/10H01M10/0567H01M2300/004C07D233/90H01M10/0525
Inventor S·帕耶G·施密特I·凯雷福尔克J·哈梅尔-帕凯A·达尔维彻G·吉拉尔J·弗雷切特S·拉杜瑟A·盖尔斐K·扎吉布
Owner HYDRO QUEBEC CORP