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Electrode for an Li ion battery having a polyether-siloxane copolymer as binder

A siloxane copolymer, ion battery technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc.

Inactive Publication Date: 2014-07-23
WACKER CHEM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

A major disadvantage of the adhesives described in US2012 / 0153219 is the preparation of side-chain modified siloxanes containing Si-H groups, which precedes the actual crosslinking and represents an additional process step

Method used

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Embodiment Construction

[0013] Cross-linked polyether-siloxane copolymers (V) are highly suitable as electrode binders in Li-ion batteries and can be used via siloxane macromers (S) with the help of polyether macromonomers (P) and optional crosslinking of further compounds (W) while copolymerizing in only one process step.

[0014] Surprisingly, it has been found that flexible polyether side chains such as those in US2012 / 0153219 requiring additional preparation steps are not necessary. The natural swelling in the electrolyte is sufficient for ion conduction.

[0015] The crosslinked polyether-siloxane copolymers (V) exhibit high electrochemical stability and are stable towards reducing agents, especially lithium silicide, and are thus also suitable for use in Si-containing negative electrodes. Furthermore, the siloxane macromer (S) and the polyether macromer (P) are also stable, which allows the use of Li-supported active species such as lithium silicide.

[0016] Preferably produced by crosslinki...

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Abstract

The object of the invention is an electrode for a Li-ion battery, which contains a crosslinked polyether-siloxane copolymer (V), which can be prepared by crosslinking of siloxane macromers (S) having the average general formula (1): HaR1bSiO(4-a-b) / 2 (1), where R1 is a monovalent, SiC-bonded C1-C18 hydrocarbon radical which is free of aliphatic carbon-carbon multiple bonds and a and b are nonnegative integers, with the proviso that 0.5<(a+b)<3.0 and 0<a<2, and that at least two silicon-bonded hydrogen atoms are present per molecule, by means of polyether macromers (P) containing at least two alkenyl groups per molecule and optionally further compounds (W) containing alkenyl groups, with polyethylene glycols functionalized by one allyl group being excepted from the compounds (W) as binder; and also a process for preparing a crosslinked polyether-siloxane copolymer (V) as binder for the electrode in a Li-ion battery in a crosslinking step.

Description

technical field [0001] The invention relates to electrodes for Li-ion batteries comprising crosslinked polyether-siloxane copolymers consisting of polyether units and siloxane units as binder. Background technique [0002] The development of higher-performance electrode materials, especially anode materials, for Li-ion batteries requires the development of compatible binder systems. Due to the chemical instability of PVDF used for graphite electrodes, it is not suitable for Si-containing electrodes. This is reflected in poor electrochemical cycling behavior. [0003] Binder systems capable of processing in aqueous media, such as Na-CMC, polyvinyl alcohol or acrylates, have been described as alternatives (alternatives). They are not suitable for processing Li-supported active materials due to their reactivity towards lithiated (supported) active materials such as Li-silicides, or protic solvents commonly used for processing. [0004] US 2012 / 0153219 describes the use of si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/62C08G77/46
CPCH01M4/133H01M4/134H01M4/1393H01M4/1395H01M4/622Y02E60/10H01M4/621H01M10/0525
Inventor 彼得·吉格莱尔斯特凡·豪菲于尔根·施托雷尔
Owner WACKER CHEM GMBH
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