Li-B-O Coated Cathode Material for Lower Battery Resistance
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Solution Overview
Problem
Current battery technologies face challenges in reducing battery resistance, which affects the performance and efficiency of batteries used in various devices and vehicles.
Innovation Solution
A composite positive electrode active material is developed, comprising a lithium metal oxide with a covering layer containing Li, B, and O, where the molar ratio of Li to B is 1.5 to 3.0, and the coverage rate of the covering layer is 80% or more, manufactured through a process involving a slurry and a coating liquid containing lithium, boron, and oxygen sources, followed by airflow drying and firing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a covering layer is applied to the positive electrode active material surface, then battery resistance is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent combines the covering layer formation with the existing slurry preparation and coating processes. The coating liquid containing lithium source, boron source, and oxygen source is integrated into the standard electrode manufacturing workflow, allowing the covering layer to be formed during normal production without requiring separate manufacturing steps.
Solution Approach 2:
The patent specifies precise compositional parameters for the covering layer (Li/B molar ratio of 1.5 to 3.0, coverage rate of 80% or more) and controls these parameters through the coating liquid formulation and drying conditions. By optimizing these parameters, the patent achieves reduced battery resistance while maintaining manufacturability through standardized process control.
2Reliability
If the covering layer coverage rate is increased to 80% or more, then battery resistance is reduced, but material consumption increases
Solution Approach 1:
The patent applies the covering layer selectively to the surface of the positive electrode active material particles, concentrating the functional materials (lithium, boron, oxygen) where they are most needed at the particle surfaces. This localized application achieves high coverage rates (80% or more) while minimizing overall material consumption compared to bulk modification approaches.
Solution Approach 2:
The patent creates a composite structure consisting of the positive electrode active material core and the covering layer shell. This composite approach allows the bulk material to retain its original properties while the surface covering layer (containing lithium source, boron source, and oxygen source) provides the resistance-reducing functionality, optimizing both performance and material efficiency.
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 positive electrode active material significantly reduces battery resistance, enhancing the performance and efficiency of batteries, particularly in sulfide all-solid-state batteries, by improving lithium ion conductivity and interfacial resistance.
Implementation Method 1
a step of supplying a slurry containing the positive electrode active material and a coating liquid to a spray dryer to dropletize the slurry and perform airflow drying of the dropletized slurry
Implementation Method 2
a step of firing the precursor
Data Source
AI summary
In a composite positive electrode active material including a lithium metal oxide as a positive electrode active material and a covering layer covering at least part of a surface of the positive electrode active material, the covering layer contains an Li element, a B element, and an O element, a molar ratio Li/B of the Li element to the B element in the covering layer is 1.5 to 3.0, and a coverage rate of the covering layer covering the positive electrode active material is 80% or more.