Mesoionic Battery Electrolyte Viscosity Reduction
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Solution Overview
Problem
Conventional lithium secondary batteries have limitations in ion conductivity due to high viscosity in their electrolytes, which hinders efficient lithium ion transport.
Innovation Solution
A liquid electrolyte comprising a mesoionic compound with a specific structure and a lithium salt at optimized concentrations, which reduces viscosity and enhances lithium ion conductivity by facilitating rapid lithium ion transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ionic liquids are used as electrolyte, then reliability is improved, but ion conductivity deteriorates due to high viscosity
Solution Approach 1:
The patent changes the chemical structure parameters of the ionic liquid by introducing specific substituents (alkyl groups with 1-3 carbon atoms at positions 1 and 3 of the tetrazolium ring) to optimize the balance between viscosity and ion conductivity. This structural parameter modification reduces viscosity while maintaining the non-volatile properties that ensure reliability.
Solution Approach 2:
The patent creates a composite electrolyte system by combining the mesoionic compound (tetrazolium derivative) with lithium salt (LiPF6, LiBF4, or LiClO4) at optimized concentrations (0.5-2.0 mol/L). This composite approach synergistically combines the low viscosity and high stability of the mesoionic compound with the high ion conductivity contribution from the lithium salt.
2Object-generated harmful factors
If ionic liquid electrolyte is used, then volatility is reduced, but ion conductivity is limited by viscosity
Solution Approach 1:
The patent modifies the physical parameters of the electrolyte by selecting mesoionic compounds with specific molecular weights and structural features (alkyl groups at positions 1 and 3) that reduce viscosity. The optimized concentration range of lithium salt (0.5-2.0 mol/L) further adjusts the ion conductivity parameter while maintaining low volatility characteristics.
Solution Approach 2:
The patent discards the harmful high-viscosity property of conventional ionic liquids by replacing them with low-viscosity mesoionic compounds, while recovering and maintaining the beneficial non-volatile property. The new electrolyte system achieves both low viscosity (for high ion conductivity) and low volatility (for safety and stability).
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 achieves higher lithium ion conductivity and lower viscosity compared to conventional electrolytes, enabling improved battery performance and efficiency.
Implementation Method 1
by containing a mesoionic compound with a relatively small molecular weight, the viscosity of a liquid electrolyte can be lowered
Implementation Method 2
the lithium ion conductivity can be increased... enabling efficient lithium ion transport
Implementation Method 3
Lithium ions (Li+) generated by the reaction of the formula (I) are transferred by electro-osmosis from the anode side to the cathode side through an electrolyte
Data Source
AI summary
An object of the present invention is to provide a liquid electrolyte for batteries, which has excellent ion conductivity, a method for producing the liquid electrolyte and a battery including the liquid electrolyte. Disclosed is a liquid electrolyte for batteries, comprising a mesoionic compound represented by the following general formula (1):wherein R1 and R2 are each independently an alkyl group having 1 to 3 carbon atoms.