Nano-Solid Electrolyte Filler for All-Solid-State Battery Interface
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Solution Overview
Problem
All-solid-state lithium ion rechargeable batteries face challenges in commercialization due to low battery performance, high internal resistance, and reduced ion conductivity caused by air gaps between electrodes and the solid electrolyte, which affect stability and durability, especially in large batteries.
Innovation Solution
The introduction of a nano-scale inorganic solid electrolyte filler with a bimodal particle size distribution to fill air gaps between electrodes and the solid electrolyte, enhancing contact characteristics and reducing interface resistance, combined with a polymer gel electrolyte and specific electrode materials, to improve ion conductivity and battery performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all-solid-state lithium ion rechargeable batteries use inorganic solid electrolyte to replace organic liquid electrolyte, then stability and safety are improved, but internal resistance increases and ion conductivity decreases
Solution Approach 1:
The patent changes the particle size parameter of the solid electrolyte from conventional micrometer scale to nanometer scale (1-100 nm). This parameter change reduces the distance for ion transport across grain boundaries, significantly lowering internal resistance while maintaining the stability benefits of solid electrolyte. The nano-scale modification transforms the physical state parameters of the electrolyte system.
Solution Approach 2:
The patent creates a composite structure by filling air gaps with a mixture of nano-scale inorganic solid electrolyte particles and polymer electrolyte. This composite approach combines the stability advantages of inorganic solid electrolyte with the flexibility and ion conductivity of polymer electrolyte, achieving both low internal resistance and high stability.
2Reliability
If solid electrolyte is used in all-solid-state batteries, then safety is improved, but contact characteristics at interfaces deteriorate due to air gaps
Solution Approach 1:
The patent utilizes the porous nature created by air gaps and intentionally introduces nano-scale particles that can penetrate and fill these pores. The nano-scale solid electrolyte particles conform to the irregular interface geometries, ensuring complete filling of air gaps and achieving intimate contact between electrodes and electrolyte, thereby improving interfacial contact characteristics while maintaining safety.
Solution Approach 2:
The patent transitions from conventional micrometer-scale particles to nanometer-scale particles, representing a dimensional change in the particle size regime. This dimensional transition enables the particles to access and fill sub-micrometer air gaps that larger particles cannot reach, significantly improving interfacial contact at the microscopic level.
3Stability of the object's composition
If conventional solid electrolyte is used, then stability is maintained, but battery performance decreases due to high internal resistance
Solution Approach 1:
The patent applies parameter change by reducing particle size from micrometer to nanometer scale, which fundamentally alters the surface area to volume ratio and reduces ion transport path lengths. This parameter modification enables the solid electrolyte to achieve both stability and high battery performance by lowering internal resistance through enhanced ion conductivity at the nano-scale.
Solution Approach 2:
The patent performs preliminary action by pre-synthesizing nano-scale solid electrolyte particles with controlled size distribution before battery assembly. This preliminary preparation ensures that the nano particles are ready to effectively fill air gaps and establish optimal contact interfaces, preventing performance degradation before the battery even operates.
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 approach significantly reduces internal resistance, enhances battery performance, and maintains stability and durability, making it suitable for large-scale commercialization and applications in electric vehicles.
Implementation Method 1
air gaps of a positive electrode, a negative electrode, and an inorganic solid electrolyte layer are filled with an inorganic solid electrolyte filler
Data Source
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AI summary
Provided is an all-solid-state battery containing a nano-solid electrolyte which has excellent stability and enhanced battery performance and can be manufactured without changing an existing process. Due to substantially improved battery performance, as well as having excellent safety, the all-solid-state battery containing a nano-solid electrolyte may be widely used and further contribute to industrial development such as electric vehicles in which medium and large lithium ion rechargeable batteries are used.