Battery Cell Electrolyte and Anode Composition for End-of-Discharge Power
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Solution Overview
Problem
Current battery cells exhibit poor discharge power in the later stage of discharge, which affects their overall performance.
Innovation Solution
A battery cell design that includes a negative electrode plate with a silicon-carbon composite and a specific electrolyte system, where the electrolyte contains lithium hexafluorophosphate at a mass percentage of 15% to 20%, and the silicon-carbon composite has a mass percentage of element silicon ranging from 0.3% to 10.0%.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional battery cell designs are used, then basic battery function is achieved, but discharge power in the later stage of discharge is poor
Solution Approach 1:
The patent changes the chemical composition parameters of the electrolyte by specifying lithium hexafluorophosphate content at 15%-20% and silicon content in silicon-carbon composite at 0.3%-10.0%, which improves discharge power in the later stage while maintaining overall discharge performance
Solution Approach 2:
The patent uses silicon-carbon composite material in the negative electrode, combining silicon's high capacity with carbon's structural stability, achieving both improved discharge power and sustained discharge duration through the synergistic effect of the composite material
2Power
If silicon content in silicon-carbon composite is increased, then discharge power is improved, but internal resistance increases
Solution Approach 1:
The patent optimizes the silicon content parameter within 0.3%-10.0% range and electrolyte lithium hexafluorophosphate concentration at 15%-20%, finding the optimal balance point where discharge power is improved while internal resistance increase is controlled within acceptable limits
Solution Approach 2:
The patent applies local quality by creating a specific electrolyte composition environment (15%-20% lithium hexafluorophosphate) that locally compensates for the resistance increase caused by silicon, allowing high silicon content (up to 10.0%) to be used without excessive internal resistance penalty
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 design reduces the internal resistance of the battery at the end of discharge, thereby improving discharge power performance and energy density.
Implementation Method 1
The electrolyte includes a lithium salt, where the lithium salt includes lithium hexafluorophosphate... reduces the internal resistance of the battery at the end of discharge
Implementation Method 2
The negative electrode active material further includes a carbon-based material and a silicon-carbon composite... improving discharge power performance
Data Source
AI summary
A battery cell includes an electrolyte, positive and negative electrode plates, and a separator between the positive and negative electrode plates. The electrolyte includes a lithium salt including lithium hexafluorophosphate, a mass percentage of which with respect to a total mass of the electrolyte ranges from 15% to 20%. The positive/negative electrode plate includes a positive/negative electrode current collector and a positive/negative electrode film layer provided on at least one side of the positive/negative electrode current collector and containing a positive/negative electrode active material. The negative electrode active material includes a carbon-based material and a silicon-carbon composite. A mass percentage of silicon in the silicon-carbon composite with respect to a total mass of the negative electrode active material is greater than or equal to 0.3% and less than or equal to 10.0%.