Solid Electrolyte Layer Composition for Higher Ionic Conductivity
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Solution Overview
Problem
Existing all-solid-state secondary batteries suffer from low ionic conductivity, limiting their performance.
Innovation Solution
Incorporating a compound represented by the composition formula MxZr2(PO4)y into the solid electrolyte layer, where M is Na, K, Mg, Ca, Sr, Ba, Cu, or Zn, and adjusting the abundance ratio, particle size, and crystal structure to enhance ionic conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional solid electrolytes are used in all-solid-state secondary batteries, then the battery structure is simplified and safety is improved, but the ionic conductivity is insufficient
Solution Approach 1:
The patent uses composite materials by combining solid electrolyte particles with amorphous phase-containing particles in a specific ratio (1:4 to 4:1 by volume). This composite structure allows the crystalline solid electrolyte to provide safety and structural stability while the amorphous phase enhances ionic conductivity, resolving the contradiction between safety and ionic conductivity.
Solution Approach 2:
The patent changes the physical and chemical parameters of the solid electrolyte system by introducing an amorphous phase and controlling its content (10-90 volume%). This parameter change transforms the purely crystalline structure into a composite structure with both crystalline and amorphous phases, thereby improving ionic conductivity while maintaining the safety advantages of solid electrolytes.
2Use of energy by moving object
If the ionic conductivity of solid electrolyte is enhanced by material modification, then battery performance improves, but the manufacturing complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-synthesizing particles containing amorphous phases before mixing them with solid electrolyte particles. This pre-preparation of amorphous-phase-containing particles simplifies the overall manufacturing process compared to attempting to create the composite structure in-situ, as the amorphous phase particles are ready-made components that can be directly mixed and sintered.
Solution Approach 2:
The patent segments the solid electrolyte system into two distinct particle components: crystalline solid electrolyte particles and amorphous phase-containing particles. This segmentation allows each component to be optimized and manufactured separately using different processes, then combined through simple mixing and sintering, reducing overall manufacturing complexity compared to creating a homogeneous modified solid electrolyte.
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 modified solid electrolyte layer exhibits improved ionic conductivity, leading to enhanced performance of the all-solid-state secondary battery.
Implementation Method 1
it is required to enhance the ionic conductivity of the solid electrolyte forming the all-solid-state secondary battery
Implementation Method 2
a step of sintering a mixture obtained by the mixing, in a temperature range of 500° C. or higher and 1000° C. or lower
Data Source
AI summary
A solid electrolyte layer includes a solid electrolyte and a compound represented by a composition formula MxZr2(PO4)y. In the composition formula, M represents at least one selected from the group consisting of Na, K, Mg, Ca, Sr, Ba, Cu, Zn, and Ni, x satisfies 0<x≤2.5, and y satisfies 2.7≤y≤3.5.