Porous Electrode Plate Structure for High-Loading Li-Ion Batteries
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Solution Overview
Problem
Conventional secondary batteries face challenges in achieving high energy density while maintaining electrochemical performance, as increasing electrode plate coating weights extend lithium ion transmission paths and increase impedance.
Innovation Solution
An electrode plate with a porous active substance layer, comprising a current collector and an active main material combined with a porous material, features pores that facilitate electrolyte transmission and shorten lithium ion paths, reducing impedance and enhancing rate performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If coating weight of electrode plate is increased to achieve high energy density, then energy density is improved, but transmission path of lithium ions is extended and impedance increases
Solution Approach 1:
The patent applies porous materials to construct the active substance layer with a three-dimensional porous structure. This porous structure provides multiple transmission channels for lithium ions, significantly shortening the transmission path compared to conventional dense structures. The porous architecture enables high coating weight to be achieved while maintaining short lithium ion transmission paths, thereby resolving the contradiction between energy density and impedance.
2Quantity of substance
If coating weight of electrode plate is increased to achieve high energy density, then energy density is improved, but rate performance deteriorates
Solution Approach 1:
The three-dimensional porous structure constructed using porous materials provides numerous interconnected channels that facilitate rapid lithium ion transport. This structure enables the electrode plate to achieve high energy density through increased coating weight while simultaneously maintaining excellent rate performance due to the shortened and multiplied transmission paths for lithium ions.
Solution Approach 2:
The patent transitions from a conventional two-dimensional planar structure to a three-dimensional porous structure. This dimensional change creates multiple transmission pathways within the active substance layer, allowing lithium ions to reach active materials more efficiently. The 3D porous architecture enables both high coating weight and fast ion transport, resolving the contradiction between energy density and rate performance.
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 plate design improves electrolyte infiltration and lithium ion transmission, resulting in high rate performance and low impedance for secondary batteries, addressing the limitations of conventional technologies.
Implementation Method 1
The active substance layer has the pore, which facilitates liquid-phase transmission of an electrolyte
Implementation Method 2
shortens transmission paths of lithium ions, thus reducing the impedance of the electrode plate
Data Source
AI summary
An electrode plate and a method for preparing the electrode plate, a secondary battery, a battery module, a battery pack, and an electric apparatus are described. The electrode plate includes a current collector and an active substance layer provided on at least one surface of the current collector. The active substance layer includes an active main material and a porous material. The active substance layer has pores, where the pore runs through or not through the active substance layer. Thickness of the active substance layer is x, and distance between two end openings of the pore in a direction perpendicular to the active substance layer is y, where x and y satisfy the following condition: 0.1≤x≤y≤x.