Electrode Assembly Lithium Coating for Capacity Retention
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Solution Overview
Problem
Lithium secondary batteries experience a decrease in mobile lithium ions due to side reactions, leading to reduced electric capacity and shortened lifespan as they are used continuously.
Innovation Solution
Incorporating a lithium coating layer on the second electrode plate with a cover layer containing Li2O, which supplies lithium ions to the electrolyte, and controlling the thickness of the cover layer to manage diffusion speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a lithium coating layer is added to the second electrode plate, then the supply of lithium ions is improved, but the device complexity increases
Solution Approach 1:
The lithium coating layer is integrated directly onto the second electrode plate substrate, with the cover layer forming an outer protective shell. This nested structure allows the lithium coating layer to be contained within the electrode plate assembly without requiring separate external lithium storage components, thereby improving lithium ion supply while avoiding excessive structural complexity
Solution Approach 2:
The patent employs a composite structure combining the second electrode plate substrate with a lithium-containing coating layer and an outer cover layer. This composite material approach enables the electrode plate to simultaneously provide structural support, lithium ion storage, and protective functions, resolving the contradiction between improving lithium ion quantity and maintaining device simplicity
2Reliability
If the cover layer thickness is increased to protect the lithium coating layer, then the reliability is improved, but the diffusion speed of lithium ions deteriorates
Solution Approach 1:
The patent optimizes the cover layer thickness to a specific range (100-500 nm) that balances protective function with lithium ion diffusion performance. By precisely controlling this parameter, the cover layer provides adequate protection against dendrite penetration and structural degradation while maintaining sufficient porosity and thickness characteristics that allow efficient lithium ion transport, thus resolving the contradiction between reliability improvement and diffusion speed maintenance
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
Maintains the output and electric capacity of the battery by continuously supplying lithium ions, preventing deterioration and extending the battery's lifespan.
Implementation Method 1
lithium contained in the lithium coating layer may be ionized to provide lithium ions to the electrolyte
Implementation Method 2
as the thickness of the cover layer increases, lithium ions supplied from the lithium coating layer may diffuse more slowly
Data Source
AI summary
An electrode assembly includes a first electrode plate including a first substrate and a first composite portion on the first substrate, a second electrode plate including a second substrate, a second composite portion on the second substrate, and a lithium coating layer on the second substrate, and a separator between the first electrode plate and the second electrode plate.