Boron Additive Electrolyte for Low-Temp Power and High-Temp Stability
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Solution Overview
Problem
Lithium ion batteries face performance issues at low temperatures due to increased electrolyte viscosity, decreased ionic conductivity, and reduced lithium ion diffusion, while conventional additives improve low temperature performance but compromise high temperature stability.
Innovation Solution
The use of electrolyte formulations incorporating a lithium salt, organic solvent, and boron-containing additives such as tris(2,2,2-trifluoroethyl)borate, bis(neopentylglycolato)diboron, and bis(trimethylene)diborate, which improve low temperature power performance without significantly affecting high temperature stability by modifying the solid electrolyte interphase (SEI) layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If solvents with very low melting points and low viscosity are added to improve low temperature performance, then power capability at low temperature is improved, but high temperature stability deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the electrolyte by introducing boron-containing compounds (diborons and borates) as additives. These additives modify the properties of the electrolyte solution to achieve both low temperature power capability and high temperature stability simultaneously, rather than using conventional low melting point solvents that compromise high temperature performance.
Solution Approach 2:
The electrolyte formulation uses a composite approach by combining lithium salt, organic solvent, and boron-containing additives (diborons and borates) in specific proportions. This composite electrolyte system leverages the synergistic effects of different components to achieve wide temperature range operation without the trade-offs of conventional single-solvent approaches.
2Reliability
If conventional electrolyte formulations are used, then high temperature stability is maintained, but low temperature power performance suffers
Solution Approach 1:
The patent modifies the electrolyte composition parameters by adding boron-containing compounds (0.1-5 wt% of total electrolyte mass) to the conventional formulation. This parameter change enables the electrolyte to maintain high temperature stability while simultaneously improving low temperature power capability through enhanced ionic conductivity and modified diffusion characteristics.
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
These formulations enhance low temperature power performance while maintaining or improving high temperature stability, ensuring wide operating temperature range capabilities without negative effects on discharge capacities or coulombic efficiencies.
Implementation Method 1
modifying the solid electrolyte interphase (SEI) layer
Implementation Method 2
slower lithium ion diffusion
Implementation Method 3
decrease in the ionic conductivity of the electrolyte
Data Source
AI summary
Electrolyte solutions including additives or combinations of additives that provide low temperature performance and high temperature stability in lithium ion battery cells.