Separator Design to Inhibit Electrolyte Decomposition in Lithium Batteries
Here’s PatSnap Eureka !
Summary
Problems
Lithium secondary batteries face limitations due to electrolyte decomposition reactions, which are catalyzed by decomposition products like HF and lead to battery capacity degradation and swelling.
Innovation solutions
A separator for lithium secondary batteries is developed, featuring a porous substrate with an inorganic particle layer that includes a binder composed of a first water-soluble polymer with a metal carboxylate group and a second water-soluble polymer based on (meth)acrylamide, effectively inhibiting electrolyte decomposition.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If electrolyte additives are introduced to inhibit electrolyte decomposition, then electrolyte decomposition is suppressed, but cell performance deteriorates and storage stability worsens
Why choose this principle:
The patent extracts the electrolyte decomposition inhibition function from the electrolyte additive and transfers it to the separator. The separator is coated with an inorganic particle layer containing basic inorganic particles (such as metal oxides or hydroxides) that neutralize acid decomposition products like HF, thereby inhibiting electrolyte decomposition without using traditional electrolyte additives that harm cell performance.
Principle concept:
If electrolyte additives are introduced to inhibit electrolyte decomposition, then electrolyte decomposition is suppressed, but cell performance deteriorates and storage stability worsens
Why choose this principle:
The inorganic particle layer on the separator acts as an intermediary between the electrolyte and the separator substrate. This layer captures and neutralizes harmful decomposition products (HF, PO3F2-) generated during electrolyte decomposition, preventing them from attacking the separator and electrodes, thus protecting the battery system without requiring dissolved additives.
Application Domain
Data Source
AI summary:
A separator for lithium secondary batteries is developed, featuring a porous substrate with an inorganic particle layer that includes a binder composed of a first water-soluble polymer with a metal carboxylate group and a second water-soluble polymer based on (meth)acrylamide, effectively inhibiting electrolyte decomposition.
Abstract
Provided are a separator, a method for manufacturing the same, and an electrochemical device including the separator. According to an exemplary embodiment of the present disclosure, a separator including: a porous substrate; and an inorganic particle layer which is formed on at least one surface of the porous substrate and includes a binder and inorganic particles, wherein the binder includes a first water-soluble polymer including a metal carboxylate group and a second water-soluble polymer based on (meth)acrylamide, is provided.