Negative Electrode Plate Ion Dynamics Optimization
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Solution Overview
Problem
Current battery technologies face challenges in achieving fast charging speeds, high energy density, and long cycle life due to inadequate design of the negative electrode plate, which affects the distribution and conductivity of active ions.
Innovation Solution
A negative electrode plate design that incorporates a graphite-based negative active material with a specific relationship between the OI value and pressing density of the negative film, optimizing the end faces for ion deintercalation and intercalation, ensuring fast charging, high energy density, and good safety performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the negative active material having excellent rate performance is used in an unreasonably designed negative electrode plate, then the rate performance is improved, but the continuous fast charging goal is not attained
Solution Approach 1:
The patent applies parameter changes by establishing a specific quantitative relationship between OI value and pressing density through the formula 0.7≤(80/VOI+43/PD)×PD/VOI≤21.5. This mathematical constraint transforms the design from qualitative material selection to quantitative parameter optimization, enabling continuous fast charging by precisely controlling the interaction between OI value and pressing density parameters
Solution Approach 2:
The patent applies local quality by differentiating the design requirements for different regions of the negative electrode plate. The OI value and pressing density are optimized to create locally suitable conditions for ion deintercalation and intercalation at the end faces, rather than applying uniform properties throughout the entire electrode structure
2Speed
If the negative active material having general rate performance is used in a reasonably designed negative electrode plate, then the fast charging goal may be attained, but the energy density and cycle life are compromised
Solution Approach 1:
The patent uses parameter changes to simultaneously optimize multiple performance aspects by controlling the relationship between OI value and pressing density. The mathematical constraint 0.7≤(80/VOI+43/PD)×PD/VOI≤21.5 ensures that fast charging, energy density, and cycle life are all optimized together rather than traded off against each other
Solution Approach 2:
The patent applies composite materials by combining graphite-based negative active material with specifically controlled OI value and pressing density characteristics. This composite approach integrates multiple material properties to achieve fast charging, high energy density, and long cycle life simultaneously
3Quantity of substance
If the pressing density of the negative film is increased to improve energy density, then the energy density is improved, but the ion deintercalation and intercalation efficiency is reduced
Solution Approach 1:
The patent applies parameter changes by establishing the quantitative relationship 0.7≤(80/VOI+43/PD)×PD/VOI≤21.5 that coordinates pressing density (PD) with OI value. This mathematical constraint allows pressing density to be increased for higher energy density while the OI value is simultaneously optimized to maintain ion deintercalation and intercalation efficiency
Solution Approach 2:
The OI value acts as an intermediary parameter that mediates between pressing density and ion transport efficiency. By controlling the relationship between OI value and pressing density through the mathematical constraint, the patent enables high pressing density to coexist with high ion transport efficiency
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 optimized negative electrode plate enables batteries to achieve fast charging speeds, high energy density, and long cycle life by effectively managing ion dynamics and conductivity, while maintaining safety performance.
Implementation Method 1
make the negative electrode plate have more effective end faces capable of deintercalating and intercalating the active ions, and it is beneficial for the fast deintercalation and the fast intercalation of the active ions
Data Source
AI summary
The present disclosure provides a negative electrode plate and a battery, the negative electrode plate comprises a negative current collector and a negative film, the negative film is provided on at least one surface of the negative current collector and comprises a negative active material. The negative active material comprises graphite, and an OI value of the negative film represented by VOI and a pressing density of the negative film represented by PD satisfy a relationship: 0.7≤(80/VOI+43/PD)×PD/VOI≤21.5, where a unit of the pressing density of the negative film represented by PD is g/cm3. The battery of the present disclosure can have the characteristics of fast charging speed, high energy density, good safety performance and long cycle life at the same time.