Cathode Plate Parameter Window for Energy Density and Low DCR
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Solution Overview
Problem
There is a need for lithium ion batteries that maintain high energy density while continuously providing high power output, which is essential for the development of the spacecraft industry.
Innovation Solution
A cathode plate with a cathode active material layer that has a controlled compact density, areal density, and mass percentage of conductive agent, where the compact density is between 2.9 and 3.5 g/cm3, the areal density is between 0.012 and 0.018 g/cm2, and the mass percentage of conductive agent is between 2.4% and 4.4%, and these parameters satisfy the formula 3.3<a2×b/c<5.5.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the areal density of the cathode active material layer is increased to improve energy density, then the energy density is improved, but the DCR performance deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling multiple parameters of the cathode active material layer including areal density (0.012-0.018 g/cm²), compact density (2.9-3.5 g/cm³), and conductive agent content (2.4-4.4 mass%). The patent further introduces a mathematical relationship (a²×b/c between 3.3-5.5) that coordinates these parameters to simultaneously achieve high energy density and excellent DCR performance, resolving the trade-off between these conflicting requirements.
2Reliability
If the content of conductive agent is increased to improve DCR performance, then the DCR performance is improved, but the energy density deteriorates
Solution Approach 1:
The patent optimizes the conductive agent content within a specific range (2.4-4.4 mass%) and establishes its quantitative relationship with areal density and compact density through the formula a²×b/c between 3.3-5.5. This coordinated parameter control ensures sufficient electrical conductivity while minimizing the volume occupied by conductive agents, thereby maintaining high energy density.
3Use of energy by moving object
If the compact density of the cathode active material layer is increased to improve energy density, then the energy density is improved, but the manufacturing precision deteriorates
Solution Approach 1:
The patent specifies a controlled range for compact density (2.9-3.5 g/cm³) and integrates it with areal density and conductive agent content through the mathematical relationship a²×b/c between 3.3-5.5. This coordinated approach provides clear manufacturing targets and control criteria, enabling precise fabrication while achieving high energy density.
Data Source
AI summary
The present disclosure discloses a cathode plate and a lithium ion battery, and relates to the field of battery technologies. The cathode plate includes a cathode current collector and a cathode active material layer provided on the cathode current collector, wherein the compact density of the cathode active material layer is a g/cm3, where 2.9≤a≤3.5; the areal density of the cathode active material layer is b g/cm2, where 0.012≤b≤0.018; and the mass percentage of the conductive agent in the cathode active material layer is c, where 2.4%≤c≤4.4%, and the cathode active material layer satisfies the formula below: 3.3<a2×b/c<5.5. The lithium ion battery prepared from the cathode plate can achieve excellent Direct Current Resistance (DCR) performance while ensuring the energy density of the battery cell.