Lithium-Ion Cell Geometry and Electrolyte for Corner Depletion
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Solution Overview
Problem
The depletion of electrolyte at the corners of thin and light lithium-ion batteries affects their room-temperature cycling performance, leading to reduced efficiency.
Innovation Solution
An electrochemical apparatus with a cell structure featuring a curved and straight portion ratio of 5≤L/D≤10, combined with an electrolyte containing 5% to 15% propylene carbonate, enhances electrolyte retention and reduces consumption at the negative electrode interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the battery is made thinner and lighter, then the specific energy and portability are improved, but the electrolyte depletes at the corners of the cell structure, worsening the room-temperature cycling performance
Solution Approach 1:
The patent changes the chemical composition parameters of the electrolyte by specifying precise proportions of five different electrolyte components (cyclic carbonates, chain carbonates, and their combinations) to optimize electrolyte retention. This compositional parameter adjustment prevents corner depletion while maintaining the thin and light battery structure, thereby improving room-temperature cycling performance without sacrificing portability.
2Volume of moving object
If the battery is made thinner and lighter, then the volume and weight are reduced, but the electrolyte depletion at corners increases, affecting cycling performance
Solution Approach 1:
The patent adjusts the electrolyte composition parameters by defining specific weight percentage ranges for five electrolyte components. This parameter optimization ensures adequate electrolyte volume retention in corner regions while maintaining the reduced overall battery volume, thus improving cycling performance without compromising the compact form factor.
Solution Approach 2:
The patent employs a composite electrolyte system comprising five different electrolyte components in specific proportions. This composite electrolyte formulation enhances overall electrolyte retention characteristics and prevents corner depletion more effectively than single-component electrolytes, thereby improving room-temperature cycling performance in thin and light batteries while maintaining compact volume.
3Reliability
If the electrolyte composition is optimized to prevent corner depletion, then the room-temperature cycling performance is improved, but the electrolyte formulation becomes more complex
Solution Approach 1:
The patent optimizes electrolyte composition by adjusting the parameters (weight percentages) of five electrolyte components within specific ranges. This systematic parameter optimization achieves improved room-temperature cycling performance through a structured approach that balances performance enhancement with formulation manageability, avoiding excessive complexity while effectively preventing corner depletion.
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 configuration significantly improves the room-temperature cycling performance of lithium-ion batteries by suppressing electrolyte depletion and maintaining efficient ion transmission.
Implementation Method 1
the electrolyte includes propylene carbonate, and based on a mass of the electrolyte, a percentage of the propylene carbonate is A %, and 5≤A≤15
Data Source
AI summary
An electrochemical apparatus including a cell, the cell including a positive electrode, a negative electrode, an electrolyte, and a separator, where an outermost electrode of the cell has a curved portion and a straight portion, a length of the straight portion is L mm, a radius of the curved portion is D mm, and 5≤L/D≤10; and the electrolyte includes propylene carbonate, and based on a mass of the electrolyte, a percentage of the propylene carbonate is A %, and 5≤A≤15.