Sodium Imide Battery Electrolyte for Fast-Charge Dendrite Suppression
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Solution Overview
Problem
Rapid charging of rechargeable lithium batteries leads to lithium dendrite precipitation on the negative electrode, deteriorating cycle-life characteristics and increasing resistance, which existing electrolytes fail to effectively address.
Innovation Solution
An electrolyte composition for rechargeable lithium batteries incorporating a non-aqueous organic solvent, lithium salt, and a sodium imide salt, with a sodium imide salt content of 0.2 to 1.0 wt% based on the electrolyte, forming a lithophilic film on the negative electrode to suppress dendrite formation and resistance increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If rapid charging is performed, then charging speed is improved, but lithium dendrite precipitates on the negative electrode causing cycle-life deterioration and resistance increase
Solution Approach 1:
The patent introduces a specific electrolyte composition containing sodium imide salt (0.2-1.0 wt%) as an intermediary substance that mediates between the charging process and the negative electrode. This electrolyte formulation acts as a buffer that enables rapid charging while preventing dendrite formation, thus resolving the contradiction between charging speed and cycle-life reliability
Solution Approach 2:
The patent changes the chemical composition parameters of the electrolyte by incorporating sodium imide salt at specific concentrations (0.2-1.0 wt%). This parameter modification transforms the electrolyte's properties to simultaneously support high charging rates and prevent dendrite precipitation, thereby improving both productivity and reliability
2Productivity
If rapid charging is performed, then charging speed is improved, but resistance of the rechargeable lithium battery increases
Solution Approach 1:
The electrolyte composition with sodium imide salt serves as an intermediary that decouples the relationship between rapid charging and resistance increase. The specific electrolyte formulation allows high charging currents to pass while maintaining low resistance at the electrode interface, preventing the harmful effect of resistance buildup during fast charging
3Ease of manufacture
If existing electrolyte composition is used, then manufacturing simplicity is maintained, but lithium dendrite precipitation occurs on the negative electrode
Solution Approach 1:
The patent modifies the electrolyte composition parameters by adding sodium imide salt at 0.2-1.0 wt%, which is a straightforward compositional change that maintains ease of manufacture while effectively preventing lithium dendrite precipitation. The modification involves simple parameter adjustment rather than complex process changes
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 electrolyte composition enhances rapid charging performance while minimizing cycle-life deterioration and resistance increase, thereby improving the safety and efficiency of rechargeable lithium batteries.
Implementation Method 1
forming a lithophilic film on the negative electrode to suppress dendrite formation
Implementation Method 2
a positive electrode including a positive electrode active material capable of intercalating/deintercalating lithium ions and a negative electrode including a negative electrode active material capable of intercalating/deintercalating lithium ions
Data Source
AI summary
An electrolyte for a rechargeable lithium battery and rechargeable lithium battery including the same, the electrolyte including a non-aqueous organic solvent, a lithium salt, and a sodium imide salt. Details of the sodium imide salt are as described in the specification.