Separator-Free Electrode Assembly for Lithium Dendrite Suppression
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Solution Overview
Problem
Rechargeable lithium batteries face challenges in suppressing lithium dendrite growth, side reactions, and maintaining reliability, processability, high-temperature storage stability, and thermal stability due to limitations in existing electrode designs.
Innovation Solution
An electrode assembly for rechargeable lithium batteries is developed, featuring a negative electrode with a current collector, a negative electrode active material layer, a first functional layer, and an organic-inorganic composite layer, which integrates with the negative electrode active material layer, and a positive electrode with a second functional layer facing the organic-inorganic composite layer, eliminating the need for a separate separator and enhancing stability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate separator is used in the electrode assembly, then safety and reliability are improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges the separator function with the negative electrode structure by forming an organic-inorganic composite layer directly on the negative electrode active material layer. This integrated design eliminates the need for a separate physical separator while maintaining the safety and reliability functions that a traditional separator would provide, thus reducing device complexity and manufacturing cost while preserving reliability.
2Ease of manufacture
If traditional electrode design is used, then manufacturing process is simple, but lithium dendrite growth and side reactions cannot be effectively suppressed
Solution Approach 1:
The patent employs an organic-inorganic composite layer formed directly on the negative electrode active material layer. This composite structure combines the benefits of organic materials (flexibility, processability) with inorganic materials (dendrite suppression, stability), achieving effective suppression of lithium dendrites and side reactions while maintaining ease of manufacture through direct formation on the existing electrode structure.
Solution Approach 2:
The patent applies a functional layer with specific properties (organic-inorganic composite) locally at the negative electrode active material layer where lithium dendrite formation is most problematic. This targeted approach suppresses dendrite growth and side reactions precisely where needed without requiring changes to the entire electrode assembly structure, thus maintaining manufacturing simplicity while improving reliability.
3Ease of manufacture
If existing electrode structures are used, then manufacturing cost is low, but high-temperature storage stability and thermal stability are insufficient
Solution Approach 1:
The organic-inorganic composite layer combines organic binding materials with inorganic functional materials that provide enhanced thermal stability and high-temperature storage stability. This composite structure achieves improved stability properties without requiring expensive alternative electrode designs, maintaining cost-effectiveness while solving the thermal stability problem.
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 assembly effectively suppresses lithium dendrite growth, reduces side reactions, improves cell reliability, and enhances high-temperature storage and thermal stability, leading to improved battery performance and efficiency without the need for a separate separator, thus reducing manufacturing costs and complexity.
Implementation Method 1
an organic-inorganic composite layer which is integrated with the negative electrode active material layer
Implementation Method 2
efficient suppression or reduction of side reaction
Implementation Method 3
a positive electrode and a negative electrode, which include an active material allowing intercalation and deintercalation of lithium ions
Implementation Method 4
to generate electric energy through oxidation and reduction upon intercalation and deintercalation of lithium ions
Data Source
AI summary
An electrode assembly for a rechargeable lithium battery and a rechargeable lithium battery are disclosed. The electrode assembly for a rechargeable lithium battery includes a negative electrode and a positive electrode, wherein the negative electrode includes a current collector; a negative electrode active material layer on the current collector and including a negative electrode material; and a first functional layer and an organic-inorganic composite layer sequentially on the negative electrode active material layer, the first functional layer being integrated with the negative electrode material layer, and wherein the positive electrode includes a second functional layer facing the organic-inorganic composite layer.