Multi-Layer Polymer Electrolyte Electrode Structure Without Separator
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Solution Overview
Problem
Existing lithium secondary batteries face challenges with reduced energy density and stability due to the use of separation membranes between the cathode and anode, which can lead to decreased volumetric energy density and reduced electronic and ionic conductivity, and potential short-circuits without them.
Innovation Solution
A multi-layer electrode structure is developed with a first electrolyte layer formed through photopolymerization and a second electrolyte layer through thermal polymerization, using polymer electrolytes with different compositions and thicknesses, eliminating the need for a separation membrane and enhancing interfacial adhesion and ionic conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separation membrane is included between the cathode and anode, then safety is improved, but volumetric energy density decreases
Solution Approach 1:
The patent merges the functions of the separation membrane and electrolyte layer into a single integrated structure. The solid electrolyte layer serves both as the medium for ion transport and as the separation barrier between electrodes, eliminating the need for a separate porous separation membrane while maintaining safety and improving volumetric energy density.
Solution Approach 2:
The patent extracts and removes the separate porous separation membrane from the battery structure, retaining only the essential electrolyte layer that performs both separation and ion conduction functions. This reduction in component layers directly increases volumetric energy density while the solid electrolyte maintains safety through its inherent properties.
2Reliability
If the electrolyte is solidified to enhance safety, then safety is improved, but manufacturing complexity increases
Solution Approach 1:
The patent employs composite material strategies where the solid electrolyte layer is formed by combining polymer matrices with ceramic fillers or through composite polymer structures. This approach enhances safety through solid-state properties while the composite nature allows for flexible manufacturing processes and optimized performance characteristics.
Solution Approach 2:
The patent utilizes parameter changes in the electrolyte composition, such as adjusting polymer molecular weight, crosslinking density, and additive concentrations, to optimize both safety and manufacturability. By carefully controlling these parameters, the solid electrolyte achieves desired properties while remaining compatible with existing manufacturing techniques.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The electrode structure improves ionic conductivity, mechanical and chemical stability, and prevents short-circuits, resulting in higher energy density and safety without a separation membrane, while maintaining structural integrity during charging and discharging.
Implementation Method 1
a first electrolyte composition may be applied to a first electrode, and the first electrolyte composition may be irradiated with light to form a first electrolyte layer
Implementation Method 2
a second electrolyte composition may be injected to fill between the first electrolyte layer and the second electrode. The injected second electrolyte composition may be heated to form a second electrolyte layer
Data Source
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AI summary
An electrode structure for a lithium secondary battery according to exemplary embodiments includes a first electrode, a second electrode facing the first electrode, and a first electrolyte layer and a second electrolyte layer sequentially formed between the first electrode and the second electrode. The first electrolyte layer and the second electrolyte layer each include a polymer electrolyte and may have different compositions. The electrode structure may be manufactured using a heterogeneous curing process.