Halide Solid-State Electrolyte Sizing for Stable Li-Ion Cycling
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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 of 50 nm to 3 µm, achieved through nanonization treatment, which increases the specific surface area and improves contact between the electrolyte and 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 ion transport dynamics deteriorates and the electrolyte particles are prone to pulverization and cracking
Solution Approach 1:
The patent applies parameter changes by optimizing the particle size distribution of halide solid-state electrolytes. Specifically, it controls the D10 particle size to be 0.5-5 µm and the D50 particle size to be 1-20 µm, which balances the ease of manufacture with improved ion transport dynamics and reduced susceptibility to pulverization and cracking during battery cycling.
2Ease of manufacture
If halide solid-state electrolytes with larger particle sizes are used, then the manufacturing process is simpler, but the contact between positive electrode active substance and electrolyte deteriorates
Solution Approach 1:
The patent optimizes the particle size distribution parameters of the halide solid-state electrolyte, setting D10 to 0.5-5 µm and D50 to 1-20 µm. This parameter optimization increases the specific surface area of the electrolyte particles, thereby improving the contact area between the positive electrode active substance and the electrolyte, which enhances interfacial reactions and ion transport.
3Ease of manufacture
If halide solid-state electrolytes with larger particle sizes are used, then the manufacturing process is simpler, but the capacity, rate performance, and cycle performance deteriorate
Solution Approach 1:
The patent applies parameter changes by precisely controlling the particle size distribution of the halide solid-state electrolyte, with D10 at 0.5-5 µm and D50 at 1-20 µm. This optimization improves capacity, rate performance, and cycle performance while maintaining manufacturing simplicity. Additionally, the patent optimizes the content of small-particle electrolyte in the positive electrode to 1-50 wt%, further enhancing battery performance.
Solution Approach 2:
The patent employs composite material strategy by creating a mixed particle size distribution system. It combines fine particles (D10: 0.5-5 µm) that provide large specific surface area for good contact and fast ion transport, with coarser particles (D50: 1-20 µm) that maintain structural stability. This composite approach maximizes both electrochemical performance and manufacturing feasibility.
Data Source
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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-yBrxIy (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.