Electrode Assembly With Electrolyte Adsorption Layer for Longer Cycle Life
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Solution Overview
Problem
Lithium ion batteries face premature deterioration due to insufficient electrolyte supplementation during cycling, leading to reduced cycle life and performance.
Innovation Solution
Incorporating an electrolyte adsorption layer with ion exchange channels on the surfaces of the cathode and anode electrode plates and the separator, which retains and slowly releases electrolyte to supplement consumption during cycling, improving ion conduction and diffusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional battery structure without electrolyte adsorption layer is used, then device complexity is low, but electrolyte supplementation during cycling is insufficient leading to reduced cycle life
Solution Approach 1:
The battery structure is segmented by adding a distinct electrolyte adsorption layer as a separate component between the electrode plates and separator. This layer is further segmented into multiple porous sub-layers with different pore sizes and electrolyte affinities, allowing systematic optimization of electrolyte retention and release characteristics to extend cycle life.
Solution Approach 2:
The electrolyte adsorption layer performs preliminary action by pre-retaining electrolyte in its porous structure before cycling begins. This预先 stored electrolyte is gradually released during charge-discharge cycles, proactively compensating for electrolyte consumption before it reaches critical levels that would damage the battery.
2Reliability
If electrolyte adsorption layer with ion exchange channels is added, then ion conduction and diffusion are improved, but device complexity increases
Solution Approach 1:
The electrolyte adsorption layer utilizes porous materials with controlled pore sizes, distributions, and connectivity. These porous structures provide ion exchange channels that facilitate efficient ion conduction and diffusion while simultaneously retaining electrolyte through capillary forces, achieving both improved ion transport and electrolyte supplementation.
Solution Approach 2:
The electrolyte adsorption layer is constructed as a composite material combining multiple porous substances with complementary properties. This composite structure integrates materials with different pore sizes, electrolyte affinities, and mechanical properties to optimize both ion conduction performance and electrolyte retention capabilities while maintaining structural integrity.
3Quantity of substance
If electrolyte is freely present in housing, then electrolyte supplementation is simple, but electrolyte cannot be sufficiently supplemented to anode electrode plates during cycling
Solution Approach 1:
The electrolyte adsorption layer acts as an intermediary between the bulk electrolyte in the housing and the anode electrode plates. It absorbs and concentrates electrolyte from the housing, then controllably releases it directly at the electrode surfaces through ion exchange channels, efficiently bridging the gap between bulk electrolyte reservoir and local electrode needs.
Solution Approach 2:
The electrolyte adsorption layer creates local quality enhancement by concentrating electrolyte precisely where it is needed—at the electrode surfaces—rather than relying on uniform bulk electrolyte distribution. The local porous structure and ion exchange channels ensure high electrolyte availability at the anode-cathode interfaces during cycling.
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
Enhances battery performance by extending cycle life and maintaining electrolyte stability, thereby improving the overall efficiency and longevity of the battery cell.
Implementation Method 1
The electrolyte adsorption layer is provided with ion exchange channels, which are through holes provided in a thickness direction of the electrolyte adsorption layer
Implementation Method 2
the electrolyte adsorption layer can be used to retain and slowly release an electrolyte to supplement the electrolyte consumed during cycling
Implementation Method 3
The electrolyte adsorption layer is provided with ion exchange channels, which are through holes provided in a thickness direction of the electrolyte adsorption layer, which is beneficial to electrolyte release and ion conduction and diffusion
Data Source
AI summary
Provided are an electrode assembly, a battery cell, a battery, and a power consuming device. The electrode assembly includes: a cathode electrode plate, an anode electrode plate, and a separator, the separator being configured to isolate the cathode electrode plate from the anode electrode plate; and an electrolyte adsorption layer configured to be arranged along a surface of at least one of the cathode electrode plate, the anode electrode plate and the separator, wherein the electrolyte adsorption layer is provided with ion exchange channels, which are through holes provided in a thickness direction of the electrolyte adsorption layer. According to the technical solution described above, the electrolyte adsorption layer, which is arranged on the surface of at least one of the cathode electrode plate, the anode electrode plate and the separator, can adsorb and retain an electrolyte.