Cathode Coating Composition for Lower-Resistance Solid-State Batteries
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Solution Overview
Problem
Current cathode active materials for all-solid-state batteries face challenges such as high resistance and poor conductivity, which affect battery performance and longevity, particularly at high temperatures, and existing solutions like surface coating or doping have limitations in reducing resistance between the cathode and solid electrolyte.
Innovation Solution
A cathode active material with a coating layer containing lithium, niobium, and elements like vanadium or zirconium is developed, which reduces battery resistance and improves performance by enhancing lithium-ion conductivity, manufactured through a method involving a mixture of precursors and calcination in an oxygen atmosphere.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If Li(NixCoyMnz)O2 is used as cathode active material, then capacity is improved, but rate capability and lifetime characteristics at high temperatures deteriorate
Solution Approach 1:
The patent applies local quality by creating a coating layer with specific elemental composition (Ni, Co, Mn, Al) on the surface of the cathode active material particles. This localized modification preserves the high capacity of the bulk Li(NixCoyMnz)O2 material while improving the surface properties for better rate capability and thermal stability, thus resolving the contradiction between capacity and reliability at high temperatures.
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 solution effectively reduces battery resistance, leading to improved battery capacity, coulomb efficiency, and overall performance of all-solid-state batteries by optimizing the interface between the cathode active material and solid electrolyte.
Implementation Method 1
a coating layer covering at least a portion of a surface of the active material particles, wherein the coating layer includes lithium (Li), niobium (Nb), and at least one element selected from the group consisting of vanadium (V), zirconium (Zr) and combinations thereof
Implementation Method 2
manufactured through a method involving a mixture of precursors and calcination in an oxygen atmosphere
Data Source
AI summary
A cathode active material for an all-solid-state battery includes: active material particles; and a coating layer covering at least a portion of the surface of the active material particles, wherein the coating layer includes lithium (Li), niobium (Nb), and at least one element selected from the group consisting of vanadium (V), zirconium (Zr) and combinations thereof.