Phosphorus-Stable Cathode Layer for Low-Resistance Solid-State Batteries
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Solution Overview
Problem
Conventional all-solid-state batteries suffer from high battery resistance due to oxidation of cathode active material particles and solid electrolyte particles.
Innovation Solution
A cathode layer for all-solid-state batteries is designed with cathode active material and solid electrolyte particles containing a phosphorus element, coated with a lithium ion conducting oxide, and a P peak intensity ratio of 0.58 or higher in X-ray photoelectron spectroscopy measurement, to maintain the phosphorus element in an unoxidized state, reducing oxidation and reaction resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional all-solid-state batteries are used, then the battery structure is simple, but the battery resistance remains high due to oxidation of cathode active material particles and solid electrolyte particles
Solution Approach 1:
A lithium ion conducting oxide coating layer is introduced as an intermediary between the cathode active material particles and the solid electrolyte particles. This coating layer prevents direct contact and oxidation reactions between the two materials, thereby reducing battery resistance without fundamentally changing the overall battery structure
Solution Approach 2:
The cathode layer is designed as a composite material system containing cathode active material particles, solid electrolyte particles, and a lithium ion conducting oxide coating layer. This composite structure combines the benefits of different materials to achieve both low resistance and structural integrity
2Stability of the object's composition
If the cathode active material particles are coated with lithium ion conducting oxide, then the oxidation resistance is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The lithium ion conducting oxide coating is applied to the cathode active material particles before assembling the battery. This preliminary coating action protects the particles from oxidation during subsequent manufacturing steps and battery operation, ensuring compositional stability from the outset
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 cathode layer significantly decreases battery resistance by suppressing oxidation, leading to lower internal resistance and improved conductivity in the all-solid-state battery.
Implementation Method 1
Conventional all-solid-state batteries suffer from high battery resistance due to oxidation of cathode active material particles and solid electrolyte particles
Implementation Method 2
a cathode layer for all-solid-state batteries, wherein the cathode layer contains cathode active material particles and solid electrolyte particles
Data Source
AI summary
Provided is a cathode that is configured to decrease battery resistance when it is used in an all-solid-state battery, and a method for producing the cathode. Disclosed is a cathode comprising a cathode layer for all-solid-state batteries, wherein the cathode layer contains cathode active material particles and solid electrolyte particles; wherein at least one of the cathode active material particles and the solid electrolyte particles contain a phosphorus element; and wherein, in a photoelectron spectrum by X-ray photoelectron spectroscopy measurement of the cathode layer, a P peak intensity ratio (A/B), which is derived from the phosphorus element, of a signal intensity A at a binding energy of 131.6 eV to a signal intensity B at a binding energy of 133.1 eV, is larger than 0.58.