Electrolyte Composition for Metal-Ion Battery
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Solution Overview
Problem
Traditional aluminum-ion batteries face limitations due to the high cost of imidazolium chloride and a narrow molar ratio range for aluminum chloride and imidazolium chloride, which restricts their yield and efficiency.
Innovation Solution
An electrolyte composition comprising a metal halide, an organic compound, and a halogen-containing salt, where the molar ratio of the metal halide to the organic compound and the halogen-containing salt is greater than 2, forming a distinct eutectic system that enhances ionic conductivity and discharge capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If imidazolium chloride is used in the electrolyte composition, then electrochemical reversibility is improved, but cost increases and manufacturing precision requirements increase
Solution Approach 1:
The patent replaces expensive imidazolium chloride with cheaper alternatives such as ammonium chloride, alkylammonium chloride, or arylammonium chloride. These substitute salts maintain the necessary electrochemical functionality while significantly reducing material costs, directly addressing the contradiction between reliability and manufacturing cost.
Solution Approach 2:
The patent expands the acceptable molar ratio range of aluminum chloride to the salt from the traditional strict range to a broader range of 1:3 to 3:1. This parameter change provides manufacturing flexibility and reduces precision requirements while maintaining electrochemical performance, resolving the contradiction between reliability and ease of manufacture.
2Reliability
If strict molar ratio control is maintained for aluminum chloride and imidazolium chloride, then electrochemical performance is improved, but productivity decreases
Solution Approach 1:
The patent fundamentally changes the molar ratio parameter from a strict narrow range to a broad range of 1:3 to 3:1 for aluminum chloride to salt. This parameter expansion allows flexible manufacturing without compromising electrochemical performance, directly resolving the contradiction between reliability and productivity by eliminating the need for precise ratio control.
Solution Approach 2:
The patent identifies that the critical requirement is maintaining adequate ionic conductivity and electrochemical stability, not a specific molar ratio. By focusing on these local quality aspects rather than global ratio control, the patent enables broader manufacturing flexibility while maintaining performance.
3Stability of the object's composition
If imidazolium chloride is used in high ratios, then electrochemical stability is improved, but manufacturing cost and complexity increase
Solution Approach 1:
The patent substitutes complex and expensive imidazolium chloride with simpler, cheaper ammonium or alkylammonium salts. These substitutes maintain electrochemical stability through similar ionic mechanisms while reducing compositional complexity and cost.
Solution Approach 2:
The patent changes the compositional parameters by allowing a broad range of salt ratios (1:3 to 3:1) and introducing optional organic compounds. This flexibility reduces the need for precise composition control and simplifies manufacturing while maintaining 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 new electrolyte composition increases the production possibilities and reduces costs by expanding the molar ratio range, thereby improving the maximum discharge capacity and Coulombic efficiency of metal-ion batteries.
Implementation Method 1
forming a distinct eutectic system that enhances ionic conductivity and discharge capacity
Implementation Method 2
enhances ionic conductivity and discharge capacity
Implementation Method 3
An aluminum-based redox couple involves in three-electron transfer during electrochemical charge/discharge reactions
Data Source
AI summary
An electrolyte composition and a metal-ion battery employing the same are provided. The electrolyte composition includes a metal halide, an organic compound, and a halogen-containing salt, wherein the halogen-containing salt has a structure represented by Formula (I)[Ca+]i[X−]j Formula (I), wherein M can be IA element, IIA element, IIIA element, IVA element, VA element, VIA element, transition metal, pyrrolium, pyrrolinium, pyrrolidinium, pyridinium, ammonium, imidazolium, indazolium, pyrimidinium, etc.; wherein A can be F, Cl, Br, or I; a=j/i; i is 1, 2, 3, or 4; j is 1, 2, 3, 4, 5, or 6. The molar ratio of the metal halide to the organic compound is higher than 2, and the molar ratio of metal halide to the halogen-containing salt is higher than 2. The metal halide is different from the halogen-containing salt.