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Rechargeable battery with ionic liquid electrolyte and electrode pressure

A technology of rechargeable batteries and electrolytes, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, organic electrolytes, etc., can solve the problems of battery capacity decline and unsuitable batteries, etc.

Pending Publication Date: 2021-07-23
HYDRO QUEBEC CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The presence of gas can cause problems in the battery by destroying the structure of the battery, usually resulting in a drop in battery capacity as the number of charge / discharge cycles increases (capacity fade) or the battery fails to function at all
Therefore, conventional carbonate organic liquid electrolytes are not suitable for batteries operating at or above 4.4V

Method used

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  • Rechargeable battery with ionic liquid electrolyte and electrode pressure
  • Rechargeable battery with ionic liquid electrolyte and electrode pressure
  • Rechargeable battery with ionic liquid electrolyte and electrode pressure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0166] Example 1: Pouch type battery with external pressure

[0167] Synthesis of LiCo using the attritor mixing method as disclosed herein 0.82 Fe 0.0976 Cr 0.0488 Si 0.00976 PO 4 . To form the positive electrode, 90% by weight LiCo 0.82 Fe 0.0976 Cr 0.0488 Si 0.00976 PO 4 , 5% by weight of polyvinylidene fluoride (PVdF) and 5% by weight of conductive carbon were mixed in N-methyl-2-pyrrolidone solution, and then coated on aluminum foil. To form the negative electrode, 94% by weight of graphite, 5% by weight of PVdF and 1% by weight of conductive carbon were mixed in N-methyl-2-pyrrolidone solution and then coated on copper foil. To form the electrolyte, make LiF 2 NO 4 S 2 (LiFSI) was dissolved in N-methyl-N-propylpyrrolidinium bis(fluorosulfonyl)imide (Py13-FSI) at a concentration of 1.2 mol / L. The pouch cells are assembled in a dry room interior. Apply screw pressure separately on the pouch cell (eg image 3 shown) and air pressure (as Figure 4 shown). T...

Embodiment 2

[0168] Example 2: Coin Cell with Ionic Liquid Electrolyte

[0169] Electrodes and electrolytes were prepared as in Example 1. Coin cells were assembled in an argon (Ar) filled glove box. Figure 14 Typical cycle stability and Coulombic efficiency of coin cells at 25 °C are shown. A reversible capacity of 120 mAh / g was achieved and over 97% capacity was retained after 100 cycles at C / 2 rate.

Embodiment 3

[0170] Example 3: GEN1 pouch cell with ionic liquid electrolyte

[0171] Electrodes and electrolytes were prepared as in Example 1. 32mAh pouch cells are assembled in a dry room. Figure 15 The typical cycle stability of this 32 mAh pouch cell at 25°C is shown. A reversible capacity of 105 mAh / g was achieved and more than 98% capacity was retained after 100 cycles at C / 2 rate.

[0172] Comparative example of embodiment 3:

[0173] Electrodes were prepared as described in Example 1. An electrolyte containing 1.2 mol / L LiPF6 in EC / EMC was prepared and used instead of ionic liquid. 32mAh pouch cells are assembled in a dry room. Figure 16 The typical cycling stability of this 32 mAh pouch cell with EC-based electrolyte at 25 °C is shown. A capacity of 120 mAh / g was obtained at the first cycle and only 17% of the capacity remained after 100 cycles at C / 2 rate.

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Abstract

The disclosure provides an alkali metal or alkaline earth metal rechargeable battery including an electrolyte including an ionic liquid and an alkali metal salt or alkaline earth metal salt. The battery also includes a negative electrode including a surface that contacts the electrolyte. The negative electrode also includes a negative electrode active material. The battery further includes a positive electrode including a surface that contacts the electrolyte. The positive electrode also includes a positive electrode active material. The battery also includes an electronically insulative separator between the positive electrode and the negative electrode and a casing surrounding the electrolyte, electrodes, and separator. The battery additionally includes a pressure application system that applies pressure to at least a portion of the electrode surfaces contacting the electrolyte.

Description

[0001] priority statement [0002] This application claims priority under 35 U.S.C. §119(e) to U.S. Provisional Patent Application Serial No. 62 / 725,087, filed August 30, 2018, entitled "Rechargeable Battery with Ionic Liquid Electrolyte and Electrode Pressure" , the full text of which is incorporated herein. technical field [0003] The present disclosure relates to an alkali metal or alkaline earth metal rechargeable battery that operates at high voltage using an ionic liquid electrolyte. The cell also applies pressure to the electrodes. Background technique [0004] Many rechargeable batteries contain organic liquid electrolytes. While organic liquid electrolytes are capable of operating at a wide range of pressures and have other advantages, the main disadvantage of organic liquid electrolytes is their tendency to catch fire, especially if the battery is damaged or has been charged and discharged many times. Another disadvantage of organic liquid electrolytes is thei...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/24H01M10/24H01M10/26H01M50/10H01M50/103
CPCH01M10/0481H01M10/0566H01M50/186H01M10/054H01M10/052H01M10/0585H01M10/0468H01M50/103Y02E60/10H01M10/058H01M4/5825H01M2300/0045H01M10/0567H01M10/0568H01M10/0569H01M10/0525H01M4/136H01M4/139H01M10/44H01M2004/027H01M2004/028Y02P70/50H01M4/58
Inventor 刘东强A·弗兰德C·金K·扎西伯J·L·艾伦S·A·德普三世T·R·周
Owner HYDRO QUEBEC CORP