Acetate Coated Cathode for All-Solid Battery Resistance
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Solution Overview
Problem
Existing methods for reducing interfacial resistance in all-solid secondary batteries are insufficient and complex, failing to adequately improve battery characteristics such as load and cycle characteristics.
Innovation Solution
A composite cathode active material is developed with a coating layer containing acetate or acetate salts on the surface of cathode active material particles, which is prepared by disposing lithium acetate and trialkyl borate on the particles and heat-treating them at 200° C. to 400° C., resulting in improved battery performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coating layer is formed on the cathode active material particle surface to reduce interfacial resistance, then battery characteristics improve, but the manufacturing process becomes complex and difficult
Solution Approach 1:
The patent changes the chemical composition parameters of the coating layer by incorporating acetate or acetate salt compounds. This specific compositional parameter change achieves effective interfacial resistance reduction and improved battery characteristics while maintaining a relatively simple manufacturing process, thus resolving the contradiction between performance improvement and process complexity.
Solution Approach 2:
The patent creates a composite coating layer structure combining acetate/acetate salt with other materials on the cathode active material particle surface. This composite material approach achieves superior interfacial resistance reduction and battery characteristics compared to single-material coatings, while the coating method remains practically feasible and not excessively complex.
2Reliability
If existing coating methods are used to reduce interfacial resistance, then some improvement is achieved, but the improvement is insufficient and the methods are complex
Solution Approach 1:
The patent modifies the coating composition by introducing acetate or acetate salt compounds with specific chemical properties. This parameter change achieves significantly better interfacial resistance reduction compared to conventional coatings, while the coating process remains straightforward and easy to manufacture, thus resolving the contradiction between effectiveness and manufacturing ease.
3Reliability
If the coating layer contains acetate or acetate salt, then interfacial resistance is significantly reduced and battery characteristics improve, but the coating composition becomes more specific and difficult to control
Solution Approach 1:
The patent establishes specific parameter ranges for acetate/acetate salt content in the coating layer (0.01-2 mole percent based on cathode active material). By defining these precise parameter boundaries, the patent achieves effective interfacial resistance reduction while making the coating composition controllable and manufacturable, thus resolving the contradiction between performance and manufacturing precision.
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 cathode active material significantly reduces interfacial resistance and enhances load and cycle characteristics, particularly at high voltages, while allowing for economical manufacturing without specialized apparatus, improving energy density and thermal stability.
Implementation Method 1
when a reaction occurs at an interface between a cathode active material particle and a solid electrolyte during charge, a resistive component is generated. In order to suppress the generation of the resistive component, a method of reducing the interfacial resistance by coating the surface of the cathode active material particle with another material has been proposed.
Implementation Method 2
heat-treating the coated cathode active material particle at a temperature of about 200° C. to about 400° C. to prepare the composite cathode active material
Data Source
AI summary
A composite cathode active material includes a cathode active material particle; and a coating layer on a surface of the cathode active material particle, wherein the coating layer includes an acetate, wherein the acetate comprises an alkali metal acetate, an alkaline earth metal acetate, a transition metal acetate, or a combination thereof, or a derivative thereof.