Solid-state electrolyte, lithium-ion battery, and electronic apparatus
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Solution Overview
Problem
Current all-solid-state batteries using halide solid-state electrolytes with larger particle sizes are prone to stress-induced pulverization and cracking, leading to reduced ion transport dynamics, capacity, rate performance, and cycle performance.
Innovation Solution
The development of a solid-state electrolyte with halides having a median particle diameter D50 of 50 nm to 3 μm, achieved through nano-processing of larger particles, to enhance the specific surface area and improve contact with the positive electrode active substance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If halide solid-state electrolytes with larger particle sizes are used, then the manufacturing process is simpler, but the electrolyte is prone to stress-induced pulverization and cracking, leading to reduced ion transport dynamics and performance
Solution Approach 1:
The patent applies segmentation by dividing the electrolyte particles into smaller size ranges (1 μm to 10 μm optimal range) to reduce internal stress concentration and prevent pulverization during battery cycling. This segmentation allows the electrolyte to better accommodate volume changes without cracking.
Solution Approach 2:
The patent changes the particle size parameter of the halide solid-state electrolyte from conventional larger sizes to a specific optimized range of 1 μm to 10 μm. This parameter change improves mechanical strength, reduces pulverization, and enhances ion transport dynamics while maintaining ease of manufacture.
2Ease of manufacture
If halide solid-state electrolytes with larger particle sizes are used, then the manufacturing process is simpler, but the specific surface area is smaller, which is not conducive to contact with the positive electrode active substance
Solution Approach 1:
By segmenting the electrolyte particles into smaller sizes (1 μm to 10 μm), the patent increases the specific surface area available for contact with the positive electrode active substance. This improves interfacial contact without significantly complicating the manufacturing process.
Solution Approach 2:
The patent optimizes the particle size parameter to achieve a balance between specific surface area and manufacturing complexity. The 1 μm to 10 μm range provides sufficient surface area for good contact while remaining practical for conventional manufacturing processes.
3Ease of manufacture
If halide solid-state electrolytes with larger particle sizes are used, then the manufacturing process is simpler, but the interface resistance increases and ion transport dynamics are affected
Solution Approach 1:
The patent segments the electrolyte into finer particles (1 μm to 10 μm) to improve interfacial contact quality with the positive electrode active substance. This segmentation reduces interface resistance and enhances ion transport dynamics while maintaining manufacturing simplicity.
Solution Approach 2:
The patent changes the particle size parameter to an optimized range that improves interface contact quality and reduces manufacturing precision requirements. The 1 μm to 10 μm range ensures good contact without requiring ultra-precise manufacturing processes.
Data Source
AI summary
The disclosure provides a solid-state electrolyte, a lithium-ion battery, and an electronic apparatus, and specifically, relates to the technical field of solid-state batteries. The solid-state electrolyte includes halides represented by formula (1), and at least part of the halides have a median particle diameter D50 of 50 nm to 3 μm, Li2+aZr1−aMaCl6−x−yBrzIy (1), in formula (1), 0<a≤0.6, 0≤x≤6, 0≤y≤6, x+y≤6, and M is selected from at least one of V, Cr, Mn, Fe, Co, and Ni. The use of the above solid-state electrolyte in the lithium-ion battery is beneficial to transport dynamics of lithium ions. Further, pulverization and cracking of the electrolyte particles during the cycle are avoided, and the electrochemical performance of the battery is improved.