Porous Carbon Cathode Plate Structure for Ion Transport Retention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing secondary battery positive electrode plates face a decline in discharge capacity retention rate due to increased coating weight, which deteriorates liquid-phase transmission and ion migration, leading to reduced energy density and electrochemical performance.
Innovation Solution
Incorporating a porous carbon material layer between the current collector and the positive electrode active substance layer, which facilitates electrolyte conduction and ion migration by forming uniform through holes, thereby enhancing discharge capacity retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If coating weight of electrode plates is increased to increase energy density, then energy density is improved, but liquid-phase transmission deteriorates and ion migration path extends, leading to decreased discharge capacity retention rate
Solution Approach 1:
A porous layer containing porous carbon material is introduced between the current collector and the positive electrode active substance layer. This porous structure provides channels for electrolyte penetration and ion migration, improving liquid-phase transmission without increasing coating weight, thereby resolving the contradiction between energy density and discharge capacity retention rate
Solution Approach 2:
The porous carbon material layer acts as an intermediary between the current collector and the positive electrode active substance layer. It facilitates electrolyte distribution and ion transport, enabling efficient liquid-phase transmission while maintaining the electrode structure, thus improving discharge capacity retention rate without compromising energy density
2Quantity of substance
If coating weight of electrode plates is increased to increase energy density, then energy density is improved, but transmission path of ions is extended, leading to deteriorated electrochemical performance
Solution Approach 1:
The porous carbon material provides a three-dimensional network of pores that serve as ion migration channels. These pores reduce the effective transmission path length and provide multiple pathways for ion transport, enabling high-speed ion migration without increasing coating weight, thus resolving the contradiction between energy density and ion migration speed
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 porous carbon layer ensures efficient gas-liquid displacement, allowing for high-speed ion migration and increased discharge capacity retention rates in secondary batteries.
Implementation Method 1
air adsorbed in the porous carbon material is displaced with a solvent
Implementation Method 2
Upon desorption, the adsorbed air overflows out of surface of the electrode plate
Implementation Method 3
facilitates continuous electrolyte conduction and penetration from the exterior to the interior of the electrode plate
Implementation Method 4
enabling high-speed migration of ions
Data Source
AI summary
Provided are a positive electrode plate for secondary battery, a manufacturing method thereof, and a secondary battery, battery module, battery pack, and electric apparatus using such positive electrode plate for secondary battery. The positive electrode plate for secondary battery includes a current collector and a positive electrode active substance layer and further includes a porous layer containing a porous carbon material between the current collector and the positive electrode active substance layer.