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Block copolymer electrolyte for lithium batteries

A technology of electrolytes and copolymers, applied in the field of solid polymer electrolytes, can solve problems such as insufficient resistance to mechanical pressure

Active Publication Date: 2019-11-08
BLUE SOLUTIONS CANADA INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The proposed solid polymer electrolyte shows good ionic conductivity, but the mechanical properties at temperatures above ambient are insufficient to resist the mechanical stress in the electrochemical single cell during operation

Method used

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  • Block copolymer electrolyte for lithium batteries
  • Block copolymer electrolyte for lithium batteries
  • Block copolymer electrolyte for lithium batteries

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Embodiment Construction

[0023] figure 1 A lithium metal polymer battery 10 is schematically shown having a plurality of electrochemical cells 12, each electrochemical cell 12 comprising an anode or negative electrode 14 made of metallic lithium sheets stacked on a current collector 20, a solid electrolyte 16 and cathode or positive electrode film 18. Solid electrolyte 16 typically includes a lithium salt to provide ionic conduction between anode 14 and cathode 18 . The thickness of the lithium metal sheet typically ranges from 20 microns to 100 microns; the thickness of the solid electrolyte 16 ranges from 5 microns to 50 microns, and the thickness of the positive electrode film 18 typically ranges from 20 microns to 100 microns.

[0024] Lithium salts can be selected from LiCF 3 SO 3 , LiB(C 2 o 4 ) 2 , LiN(CF 3 SO 2 ) 2 , LiN(FSO 2 ) 2 , LiC(CF 3 SO 2 ) 3 , LiC(CH 3 )(CF 3 SO 2 ) 2 , LiCH(CF 3 SO 2 ) 2 、LiCH 2 (CF 3 SO 2 ), LiC 2 f 5 SO 3 , LiN(C 2 f 5SO 2 ) 2 , LiN(C...

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Abstract

A solid polymer electrolyte for a battery is disclosed. The solid polymer electrolyte includes solid polymer electrolyte including a diblock copolymer AB or a triblock copolymer of the BAB type, in which block A is an unsubstituted polyethylene oxide chain having a number- average molecular weight less than 80000 g / mol; block B is an anionic polymer prepared from one or more monomers selected fromvinyl monomers and derivatives thereof to which is grafted an anion of lithium salt, and a second monomer having cross-linking functions.

Description

technical field [0001] The present invention relates to solid polymer electrolytes for lithium batteries, and more particularly to crosslinked block copolymer electrolytes with increased mechanical resistance and improved ionic conductivity. Background technique [0002] Lithium batteries using lithium metal as the negative electrode have excellent energy density. However, with repeated cycling, such batteries may undergo dendrite growth on the surface of the lithium metal electrode as the battery is recharged due to uneven replating of lithium ions on the surface of the lithium metal electrode. In order to minimize the effect of the morphological evolution of the surface of the lithium metal anode, including dendrite growth, lithium metal cells typically use a pressure system and a solid polymer electrolyte adapted to resist the pressure exerted thereon, as incorporated herein by reference described in US Patent No. 6,007,935. After many cycles, even though the electrolyt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565
CPCH01M10/052C08L101/00H01M4/382H01M10/0565H01M2300/0082Y02E60/10C08G81/025H01M4/134H01M10/0525H01M2004/027
Inventor 阿兰·瓦利帕特里克·勒布朗布里厄克·吉耶尔姆
Owner BLUE SOLUTIONS CANADA INC
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