Electrode assembly and lithium battery comprising same
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Solution Overview
Problem
Lithium secondary batteries face challenges in achieving high capacity and energy density due to irreversible capacity issues, particularly at the outermost electrodes where lithium ion intercalation/deintercalation does not occur, leading to reduced battery life and efficiency.
Innovation Solution
A stacked electrode assembly is designed with a mesh electrode current collector at the uppermost and/or lowermost positions, which reduces irreversible capacity and enhances energy density by allowing lithium ion reactions only where necessary, thereby minimizing capacity loss and improving battery performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a conventional electrode structure is used in the stacked electrode assembly, then the manufacturing process is simple, but irreversible capacity occurs at the outermost electrodes reducing battery capacity and energy density
Solution Approach 1:
The patent extracts and removes the outermost electrodes from the stacked electrode assembly. By taking out these problematic outermost electrodes that cause irreversible capacity, the battery achieves higher capacity and energy density without the detrimental effects of incomplete lithium ion reactions at the outer boundaries of stacked structures.
2Quantity of substance
If a mesh electrode current collector is used at the outermost positions, then energy density and capacity are improved, but the device structure becomes more complex
Solution Approach 1:
The patent applies local quality by using mesh electrode current collectors specifically at the outermost positions of the stacked electrode assembly, while inner electrodes can use conventional structures. This localized application of the mesh structure optimizes lithium ion reaction areas at the boundaries where irreversible capacity occurs, improving energy density without requiring the entire electrode structure to be complex.
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 use of a mesh electrode current collector at the outermost electrodes reduces irreversible capacity, increases battery capacity, and enhances energy density by optimizing the reaction area, resulting in improved lithium battery performance and extended life.
Implementation Method 1
lithium ion intercalation/deintercalation does not occur, leading to reduced battery life and efficiency
Data Source
AI summary
Provided is a stacked electrode assembly including: a lowermost electrode arranged on a lowermost portion of the stacked electrode assembly; an uppermost electrode arranged on an uppermost portion of the stacked electrode assembly; at least one unit stacked body arranged between the lowermost electrode and the uppermost electrode and including a positive electrode, a negative electrode, and a separator, the separator being arranged between the positive electrode and the negative electrode; and a separator arranged between the lowermost electrode and the at least one unit stacked body, and between the at least one unit stacked body and the uppermost electrode. A capacity and energy density of a lithium battery may be improved by employing an electrode including a mesh electrode current collector as the lowermost electrode or the uppermost electrode of the stacked electrode assembly.