Cylindrical Battery Cell Electrolyte and Nickel Film Against Shell Corrosion
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Solution Overview
Problem
Existing cylindrical battery cells face issues with reliability and cycling performance due to corrosion of the metal shell by hexafluorophosphate electrolytes, leading to metal ion generation and potential deformation.
Innovation Solution
Incorporating a hexafluorophosphate and sulfonylimide electrolyte with controlled molar concentrations and a nickel-based film layer to enhance thermal and electrochemical stability, reducing corrosion and improving mechanical integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If hexafluorophosphate electrolyte is used to achieve high capacity, then battery capacity is improved, but metal shell corrosion increases leading to metal ion generation and reliability degradation
Solution Approach 1:
A nickel-based film layer is introduced as an intermediary protective barrier between the hexafluorophosphate electrolyte and the metal shell. This film layer prevents direct contact and chemical reaction between the corrosive electrolyte and the metal shell, thereby eliminating corrosion while preserving the high capacity benefits of the hexafluorophosphate electrolyte
2Stability of the object's composition
If hexafluorophosphate concentration is increased to improve electrochemical performance, then electrochemical stability is improved, but corrosive ability towards metal shell increases
Solution Approach 1:
The nickel-based film layer serves as a protective intermediary that isolates the metal shell from the corrosive effects of high-concentration hexafluorophosphate electrolyte, allowing the system to utilize the electrochemical stability benefits without suffering from increased corrosion
Solution Approach 2:
A thin nickel-based film is deposited on the metal shell surface to provide corrosion protection. This thin film layer is sufficient to prevent electrolyte penetration and metal corrosion while maintaining the electrochemical performance of the high-concentration hexafluorophosphate electrolyte
3Strength
If metal shell thickness is increased to prevent deformation, then mechanical strength is improved, but manufacturing cost and device complexity increase
Solution Approach 1:
A thin nickel-based film layer is applied to the metal shell surface to provide corrosion protection and structural reinforcement. This thin film enhances the mechanical strength and corrosion resistance of the shell without requiring significant increases in shell thickness, thereby avoiding increased manufacturing complexity and cost
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 proposed electrolyte system with hexafluorophosphate and sulfonylimide, along with a nickel film layer, enhances the reliability and cycling performance of the battery cell by reducing corrosion and deformation risks.
Implementation Method 1
the molar concentration of the hexafluorophosphate is relatively low, reducing its corrosive ability towards the metal shell, thereby reducing the risk of the metal shell being corroded
Implementation Method 2
a hexafluorophosphate and a sulfonylimide are included, resulting in a relatively high thermal stability of the electrolyte system
Implementation Method 3
the metal shell of the cylindrical battery cell can effectively disperse the forces within the system, ensuring that the metal shell is uniformly stressed and not prone to deformation
Data Source
AI summary
A cylindrical battery cell, a battery, and an electric apparatus. The cylindrical battery cell includes a metal shell and an electrolyte. The electrolyte is accommodated in the metal shell. The electrolyte includes an electrolytic salt. The electrolytic salt includes a hexafluorophosphate and a sulfonylimide, and a molar concentration of the hexafluorophosphate is less than or equal to 0.9 mol/L.