Solid-State Battery Positive Electrode Particle Size Control
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Solution Overview
Problem
Conventional solid-state batteries experience deteriorating cycle characteristics due to repeated charging and discharging, leading to a reduction in discharge capacitance and inability to withstand repeated use.
Innovation Solution
A solid-state battery design featuring a positive electrode layer with a Li transition metal oxide having a layered rock salt-type structure and a LISICON-type solid electrolyte, where the positive electrode active material has an average particle size of 4 μm or less, reducing stress and increasing adhesive strength between the active material and the electrolyte.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the positive electrode active material uses a conventional particle size, then the battery structure is simpler to manufacture, but the cycle characteristics deteriorate due to peeling and cracking
Solution Approach 1:
The patent applies parameter changes by controlling the particle size of the positive electrode active material to 4 μm or less. This specific parameter modification resolves the technical contradiction by preventing peeling and cracking during charging and discharging, thereby improving cycle characteristics while maintaining manufacturing feasibility through established particle size control techniques
2Strength
If the positive electrode active material has large particle size, then the adhesive strength between active material and electrolyte is reduced, but the manufacturing process is simpler
Solution Approach 1:
The patent applies parameter changes by optimizing the particle size of the positive electrode active material to 4 μm or less. This parameter modification directly increases the adhesive strength between the active material and solid electrolyte, preventing peeling during cycling while avoiding excessive structural complexity through controlled particle engineering
3Productivity
If the battery uses repeated charging and discharging, then the productivity and usage duration increase, but the discharge capacitance gradually reduces due to cycle deterioration
Solution Approach 1:
The patent applies parameter changes by controlling the particle size of the positive electrode active material to 4 μm or less. This parameter optimization prevents peeling and cracking during charging and discharging cycles, thereby maintaining discharge capacitance and enabling repeated use without significant performance degradation
Solution Approach 2:
The patent applies beforehand cushioning by pre-controlling the particle size of the positive electrode active material to 4 μm or less before assembly. This preventive measure cushions against the harmful effects of peeling and cracking that would otherwise occur during repeated charging and discharging, preserving discharge capacitance over time
Data Source
AI summary
A solid-state battery including a positive electrode layer that includes a positive electrode active material having a layered rock salt-type structure and including a Li transition metal oxide containing at least one element selected from the group consisting of Co, Ni and Mn, and a solid electrolyte having a LISICON-type structure; and the positive electrode active material has an average particle size of 4 μm or less.