All-solid-state battery ion conductivity via composite electrolyte
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Solution Overview
Problem
All-solid-state batteries using solid electrolytes face challenges in delivering high output power and maintaining long life due to low ion conductivity, as well as poor rate and cycle characteristics compared to liquid electrolyte batteries.
Innovation Solution
The use of specific cathode and anode active materials, along with a solid electrolyte, formulated as MaN1bX1c, MdN2eX2f, and MgN3hX3i, where M is H, Li, Na, Mg, Al, or Ca, and X represents polyanions, with shared vertex skeleton structures and NASICON structures, enhances ion conductivity and battery performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid electrolyte is used instead of a liquid electrolyte, then safety is improved and liquid leakage is eliminated, but ion conductivity decreases and output power is reduced
Solution Approach 1:
The patent changes the chemical composition parameters of the solid electrolyte by incorporating specific ratios of Li2S, SiS2, and Li3PO4 to optimize ion conductivity while maintaining the solid state structure, thereby improving output power without sacrificing safety
Solution Approach 2:
The patent uses a composite solid electrolyte material formed by combining multiple inorganic compounds (Li2S-SiS2-Li3PO4 system) to achieve both high ion conductivity and structural stability, resolving the contradiction between safety and power output
2Reliability
If a solid electrolyte is used instead of a liquid electrolyte, then corrosion is eliminated, but rate characteristics and cycle characteristics deteriorate
Solution Approach 1:
The patent optimizes the compositional parameters of the solid electrolyte within the Li2S-SiS2-Li3PO4 system to enhance ionic transport properties, thereby improving charge-discharge rate characteristics and cycle life while maintaining corrosion resistance
3Power
If the same inorganic oxide material is interposed between electrode particles, then electric current increases, but output characteristics and charge-discharge cycle characteristics remain insufficient
Solution Approach 1:
The patent replaces single inorganic oxide materials with a composite solid electrolyte system (Li2S-SiS2-Li3PO4) that provides both high ion conductivity for increased current and improved structural stability for better cycle 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
This configuration results in all-solid-state batteries with higher output power, longer life, improved safety, and lower production costs, while avoiding issues like liquid leakage and corrosion.
Implementation Method 1
a solid electrolyte layer comprising a solid electrolyte... Low ion conductivity of a solid electrolyte
Data Source
AI summary
An all-solid-state battery having a high output power and a long life, exhibiting high safety, and being produced at a low cost is provided. The all-solid-state battery has a cathode comprising a cathode material, an anode comprising an anode material, and a solid electrolyte layer comprising a solid electrolyte, wherein the cathode material, the anode material, and the solid electrolyte are a compound shown by the following formulas (1), (2), and (3), respectively:MaN1bX1c (1)MdN2eX2f (2)MgN3hX3i (3)wherein M represents H, Li, Na, Mg, Al, K, or Ca and X1, X2, and X3 are polyanions, each of N1 and N2 is at least one atom selected from the group consisting of transition metals, Al, and Cu, and N3 is at least one atom selected from the group consisting of Ti, Ge, Hf, Zr, Al, Cr, Ga, Fe, Sc, and In.