Positive Electrode Coating for Thermal Runaway Resistance
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Solution Overview
Problem
Secondary batteries face safety and cycling performance degradation under thermal abuse, leading to thermal runaway and operational risks.
Innovation Solution
A secondary battery design featuring a positive electrode plate with an organic particle layer that undergoes thermal polymerization to form an insulating layer, enhancing adhesion and resistance, thereby reducing the risk of thermal runaway and maintaining cycling performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the positive electrode plate uses conventional structure without organic particles, then the manufacturing process is simple, but the safety performance and cycling performance decrease under thermal abuse
Solution Approach 1:
The patent incorporates organic particles into the positive electrode film layer before battery assembly, which preliminarily prepare to undergo thermal polymerization reaction when heat treatment is applied. This preliminary action ensures that the protective insulating layer is formed in advance, improving safety performance without requiring complex post-processing steps.
Solution Approach 2:
The patent creates a composite electrode structure by combining organic particles with the positive electrode active material and conductive agent. This composite material approach allows the organic particles to undergo thermal polymerization and form an insulating layer that enhances safety performance while maintaining electrochemical activity, effectively resolving the contradiction between reliability improvement and structural complexity.
2Strength
If the organic particles undergo thermal polymerization reaction to form insulating layer, then the structural stability and adhesion improve, but the resistance increases
Solution Approach 1:
The patent applies the principle of local quality by having the organic particles undergo thermal polymerization reaction only at specific locations where heat treatment is applied, forming an insulating layer locally on the surface of positive electrode active material particles. This localized approach improves adhesion force and structural stability at the particle level while minimizing the overall resistance increase of the entire electrode, as the insulating layer is formed only where thermal exposure occurs.
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 insulating layer improves structural stability and adhesion, reducing the risk of thermal runaway and maintaining good cycling performance even at high temperatures.
Implementation Method 1
the organic particles being configured to undergo a thermal polymerization reaction under a heat treatment condition to form an insulating layer covering at least a portion of the surface of the positive electrode active material
Data Source
Figure 1
AI summary
This application provides a secondary battery and an electronic apparatus. The secondary battery includes a positive electrode plate, where the positive electrode plate includes a positive electrode current collector and a positive electrode film layer. The positive electrode film layer is disposed on at least one side of the positive electrode current collector, and the positive electrode film layer includes a positive electrode active material and organic particles provided on a surface of the positive electrode active material, the organic particles being configured to undergo a thermal polymerization reaction under a heat treatment condition to form an insulating layer covering at least a portion of the surface of the positive electrode active material. When the adhesion forces between the positive electrode film layer and the positive electrode current collector before and after the heat treatment, and the resistances of the positive electrode plate before and after the heat treatment satisfy suitable relationships, the secondary battery can have good safety performance and cycling performance.