Negative Electrode Plate Design for Quick Charging
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Solution Overview
Problem
Rechargeable batteries face challenges in quick charging due to high current resistance and surface precipitation of ions, leading to reduced cycle life and safety performance, primarily because the negative electrode cannot withstand high current charges effectively.
Innovation Solution
A negative electrode plate design with a specific compacted density and particle size distribution of the negative active material, where 6.0≤PD×Dv50≤32.0 and 0.2≤PD/Dn10≤12.0, optimizing both electronic and ionic conductance to enhance charge exchange efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high current charge is applied to achieve quick charging, then charging speed is improved, but ion precipitation occurs on the negative electrode surface and cycle life deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing the particle size distribution parameters (Dv50 and Dn10) of the negative active material and the compacted density (PD) of the negative electrode film. By controlling these parameters within specific ranges, the electrode structure is optimized to accommodate high current charges without causing ion precipitation, thus enabling quick charging while maintaining cycle life
Solution Approach 2:
The patent applies local quality by creating a specific particle size distribution within the negative active material. The controlled distribution of particles with different sizes (characterized by Dv50 and Dn10) ensures that regions with different local structures can handle charge currents appropriately, preventing localized ion precipitation while maintaining overall charging speed
2Productivity
If high current charge is applied to achieve quick charging, then charging speed is improved, but safety performance deteriorates
Solution Approach 1:
The patent uses parameter changes by defining specific ranges for compacted density (PD) and particle size distribution (Dv50, Dn10) of the negative electrode. These parameter optimizations ensure that during high current charging, the electrode structure prevents harmful ion precipitation and by-product formation, thereby maintaining safety performance while achieving quick charging
3Productivity
If negative electrode structure is optimized for quick charging, then charging speed is improved, but energy density may deteriorate
Solution Approach 1:
The patent applies parameter changes by optimizing the compacted density (PD) within a specific range (0.8-1.8 g/cm³) and controlling particle size distribution (Dv50: 3-20 μm, Dn10: 0.1-10 μm). This balanced optimization allows the negative electrode to achieve good ion transport for quick charging while maintaining sufficient active material content to preserve energy density
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
This design improves the dynamic performance and extends the cycle life of batteries during quick charging by balancing electronic and ionic conductivity, preventing ion precipitation and maintaining energy density.
Implementation Method 1
the ions will be directly reduced and precipitated on the negative electrode surface instead of being embedded in the negative active material during rapid battery charge
Implementation Method 2
optimizing both electronic and ionic conductance to enhance charge exchange efficiency
Implementation Method 3
optimizing both electronic and ionic conductance to enhance charge exchange efficiency
Implementation Method 4
the ions will be directly reduced and precipitated on the negative electrode surface instead of being embedded in the negative active material during rapid battery charge
Implementation Method 5
the ions will be directly reduced and precipitated on the negative electrode surface instead of being embedded in the negative active material during rapid battery charge
Data Source
AI summary
The present invention provides a negative electrode plate and a battery. The negative electrode plate comprises a negative current collector and a negative film that is provided on at least one surface of the negative current collector and comprises a negative active material. The negative film meets the follow relations: 6.0≤PD×Dv50≤32.0 and 0.2≤PD/Dn10≤12.0. The negative electrode plate of the present invention has excellent dynamic performance, and the battery of the present invention has both excellent dynamic performance and long cycle life.