Lithium Battery Separator Mesh for Capacity Retention and Swelling Control
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Solution Overview
Problem
Current lithium secondary batteries face limitations in improving discharge capacity retention rates and maintaining high cell capacity while preventing electrode expansion and temperature increases during charging and discharging.
Innovation Solution
The lithium secondary battery design incorporates a negative electrode with lithium metal deposition and dissolution, featuring a separator with a substrate and spacer having line-shaped protrusions in a mesh pattern, which includes lacking parts to facilitate non-aqueous electrolyte flow and prevent electrode expansion, and a heat-resistant layer to manage temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spacer is provided between the positive electrode and the separator to form a space for storing lithium metal, then the discharge capacity retention rate is improved, but the device complexity increases due to the mesh pattern design
Solution Approach 1:
The separator is segmented into a substrate and a spacer component, with the spacer featuring a mesh pattern of line-shaped protrusions. This segmentation allows the spacer to create storage spaces for lithium metal while maintaining the functional integrity of the separator, thereby improving discharge capacity retention without excessive complexity
Solution Approach 2:
The spacer employs a mesh pattern with lacking parts that create a porous-like structure. This allows the non-aqueous electrolyte to flow through while maintaining spaces for lithium metal storage, achieving improved capacity retention with a relatively simple structural design
2Ease of operation
If the mesh pattern includes lacking parts connecting regions within adjacent meshes, then the non-aqueous electrolyte flow is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The mesh pattern incorporates lacking parts at specific locations to create connecting regions. This local modification allows electrolyte flow pathways to be established without requiring high precision across the entire mesh structure, reducing manufacturing precision requirements while maintaining electrolyte flow capability
3Temperature
If the separator includes a heat-resistant layer to manage temperature, then the temperature control is improved, but the device complexity increases
Solution Approach 1:
The heat-resistant layer is merged with the separator substrate to form an integrated structure. This combination provides temperature management functionality without adding separate components, thereby controlling temperature while minimizing device complexity
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
This configuration enhances discharge capacity retention rates, suppresses electrode expansion, and effectively manages temperature, leading to improved battery performance and reliability.
Implementation Method 1
a non-aqueous electrolyte having lithium ion conductivity
Implementation Method 2
lithium metal deposits on the negative electrode during charge, and the lithium metal dissolves from the negative electrode during discharge
Data Source
AI summary
A disclosed lithium secondary battery includes a positive electrode (11), a negative electrode (12), a separator (50) disposed between the positive electrode (11) and the negative electrode (12), and a non-aqueous electrolyte having lithium ion conductivity. The negative electrode (12) is an electrode on which lithium metal is deposited during charging and from which the lithium metal dissolves during discharging. The separator (50) includes a substrate (51) and a spacer (53). The spacer (53) is disposed on the negative electrode (12) side with respect to the substrate (51). The spacer (53) includes line-shaped protrusions arranged in a mesh pattern. The mesh pattern includes a lacking part connecting regions within adjacent meshes.