Negative Electrode Composition Using Crushed Conductive Additives
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Solution Overview
Problem
Conductive additives in negative electrodes for all-solid-state batteries tend to aggregate and isolate during manufacturing, leading to insufficient electronic conductivity and decreased energy density.
Innovation Solution
A negative electrode is developed using a conductive additive that is crushed using a resonance vibration method, ensuring uniform dispersion and an established electron conduction path, with a particle size D50 in the range of 1 μm to 20 μm and porosity between 0.1% and 70%.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive additive content is increased to improve electronic conductivity, then electronic conductivity is improved, but conductive additives aggregate and isolate during manufacturing, reducing the effectiveness of the improvement
Solution Approach 1:
The patent applies resonance vibration method during the manufacturing process to prevent aggregation of conductive additives. The vibration energy disrupts particle clustering and promotes uniform distribution throughout the electrode structure, thereby maintaining both high electronic conductivity and compositional uniformity simultaneously
2Reliability
If conductive additive content is increased to establish electron conduction path, then electron conduction is improved, but negative electrode density decreases, leading to decreased energy density
Solution Approach 1:
The patent optimizes the particle size parameter of conductive additives to a specific range (D50: 1-20 μm) to achieve optimal packing density and conduction network formation. This parameter control allows establishing effective electron conduction paths while minimizing the volume occupied by conductive additives, thereby preserving high energy density
3Ease of manufacture
If conventional conductive additive dispersion methods are used, then manufacturing process is simple, but conductive additives aggregate and isolate, resulting in insignificant improvement in electronic conductivity
Solution Approach 1:
The patent introduces resonance vibration method as a straightforward manufacturing step that can be easily integrated into existing production lines. This vibration-based approach effectively prevents aggregation without requiring complex equipment or multi-step processes, maintaining manufacturing simplicity while achieving superior electronic conductivity
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 solution enhances the energy density and output of all-solid-state batteries by ensuring a well-established electron conduction path and preventing aggregation of conductive additives, thereby improving the battery's performance and capacity retention.
Implementation Method 1
a conductive additive crushed using a resonance vibration method
Data Source
AI summary
A negative electrode for an all-solid-state battery and a method of manufacturing the same are provided. The negative electrode includes a conductive additive crushed using a resonance vibration method.