Crosslinked Matrix Design for High-Capacity Lithium-Ion Batteries
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Summary
Problems
Lithium-ion batteries face issues with adhesive force between the anode and separator, leading to delamination due to silicon-containing anode active material volume expansion and cracks in the separator coating layer, which reduce battery efficiency and lifespan.
Innovation solutions
A secondary battery design featuring a binder polymer with a first repeating unit and a coating layer with a second repeating unit, derived from a crosslinking agent, forming a crosslinked matrix between the anode and the separator to enhance adhesive force.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If silicon-containing anode active material is used to achieve high capacity, then battery capacity is improved, but volume expansion of 300% or more occurs during charging causing structural collapse and delamination
Why choose this principle:
The invention changes the physical and chemical parameters of the separator coating layer by introducing a crosslinking agent that reacts with the binder polymer to form a crosslinked structure. This crosslinked coating layer has different mechanical properties (higher elasticity and adhesion) compared to the original non-crosslinked layer, enabling it to accommodate the 300% volume expansion of silicon anode during charging while maintaining structural integrity and preventing delamination.
Principle concept:
If silicon-containing anode active material is used to achieve high capacity, then battery capacity is improved, but volume expansion of 300% or more occurs during charging causing structural collapse and delamination
Why choose this principle:
The invention creates a composite structure by combining the binder polymer with a crosslinking agent in the separator coating layer. This composite crosslinked structure integrates the advantages of both components: the binder polymer provides baseline adhesion while the crosslinked network adds elasticity and mechanical strength, enabling the coating to withstand the extreme volume changes of silicon anode without cracking or delaminating.
Application Domain
Data Source
AI summary:
A secondary battery design featuring a binder polymer with a first repeating unit and a coating layer with a second repeating unit, derived from a crosslinking agent, forming a crosslinked matrix between the anode and the separator to enhance adhesive force.
Abstract
Disclosed is a secondary battery that can increase the adhesive force between the anode and the separator on an electrolyte. The secondary battery includes an anode, a cathode, a separator which is between the anode and the cathode and includes a porous substrate and a coating layer on at least one surface of the porous substrate, and an electrolyte, The anode contains a binder polymer including a first repeating unit, the coating layer includes a second repeating unit, and the first repeating unit and the second repeating unit are bonded to each other.