Cathode Active Material Coating for Solid-State Electrode Contact
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Solution Overview
Problem
Current methods for manufacturing all-solid-state battery electrodes fail to achieve sufficient ion conductivity and electrical conductivity due to inadequate contact between active materials and electrolytes, leading to suboptimal battery performance and safety concerns.
Innovation Solution
A composite for positive electrode active materials is developed, featuring a coating layer with a powder of electrically conductive material and solid electrolyte, applied via a dry coating process to ensure close contact between the active material, electrolyte, and conductive material, enhancing ion and electrical conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high pressure is applied to manufacture the electrode to achieve close contact between active material and electrolyte, then ion conductivity is improved, but the electrode and/or solid electrolyte may be damaged
Solution Approach 1:
The invention applies preliminary action by pre-forming pores within the active material particles before electrode assembly. These pre-formed pores facilitate close contact between the active material and solid electrolyte without requiring high-pressure compression, thereby achieving good ion conductivity while preventing damage to the electrode and electrolyte structures.
2Ease of manufacture
If simple mixing of components is used to manufacture the electrode, then the manufacturing process is simple, but the resistance of the electrode cannot be sufficiently lowered
Solution Approach 1:
The invention applies segmentation by creating internal pores within the active material particles, which divides the material structure into multiple regions. This segmented structure increases the surface area and contact points between the active material, solid electrolyte, and conductive material, thereby reducing electrode resistance while maintaining a relatively simple manufacturing process that does not require complex multi-step procedures.
3Reliability
If close contact between active material and solid electrolyte is achieved, then ion conductivity is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The invention applies preliminary action by pre-forming pores within the active material particles before electrode assembly. These pre-formed pores facilitate close contact between the active material and solid electrolyte without requiring high-pressure compression, thereby achieving good ion conductivity while preventing damage to the electrode and electrolyte structures.
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 composite improves ion conductivity, electrical conductivity, battery capacity, charging/discharging characteristics, and lifetime, while simplifying the manufacturing process and reducing risks of overheating or explosion.
Implementation Method 1
a coating layer which is formed on pores and a surface of the positive electrode active material, the coating layer including a coating composition containing a powder of the electrically conductive material and a powder of a solid electrolyte
Data Source
AI summary
A composite includes a positive electrode active material and a coating layer formed on pores and a surface of the positive electrode active material. The coating layer includes a coating composition containing a powder of the electrically conductive material and a powder of a solid electrolyte having a particle diameter (D50) of 0.3 to 2 .