Zr-Modified Nickel Cathode Composition for Solid-State Battery Capacity
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Solution Overview
Problem
Current solid-state battery positive electrode active materials fail to achieve an improved first charge capacity of at least 160 mAh/g, which is essential for efficient electric vehicle and hybrid electric vehicle applications.
Innovation Solution
A lithium nickel-based oxide positive electrode active material comprising specific compositions of Ni, Co, Mn, D, and Zr, with controlled particle sizes and surface Zr content, is developed. The material is synthesized using a process involving lithium transition metal-based compounds, Zr alkoxide, and an oxidizing atmosphere to optimize electrochemical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional positive electrode active materials are used in solid-state batteries, then the battery structure is simple, but the first charge capacity is insufficient (less than 160 mAh/g)
Solution Approach 1:
The patent applies composite materials by combining multiple transition metal elements (Ni, Co, Mn) with dopant elements (D) and surface-modifying Zr to create a composite oxide structure. This composite approach enables the material to achieve first charge capacity of at least 160 mAh/g while maintaining structural stability through the synergistic effects of different elements.
Solution Approach 2:
The patent implements local quality by introducing dopant elements (D) at specific concentrations (0.0-2.0 mol%) and Zr surface modification (0.1-5.0 mol%) to create localized functional regions within the material structure. This allows different regions of the material to perform specialized functions, improving overall charge capacity while controlling complexity.
2Quantity of substance
If Zr content is increased to improve surface modification and electrochemical performance, then charge capacity increases, but manufacturing precision requirements increase due to tight composition control
Solution Approach 1:
The patent applies parameter changes by defining specific concentration ranges for Zr (0.1-5.0 mol%) and dopant elements (0.0-2.0 mol%) rather than fixed values. This range-based approach allows manufacturing flexibility while ensuring the material achieves the required charge capacity, balancing performance improvement with manufacturing feasibility.
Solution Approach 2:
The patent uses partial action by introducing Zr at relatively low concentrations (0.1-5.0 mol%) just sufficient to achieve the desired surface modification and charge capacity enhancement. This avoids excessive Zr addition that would unnecessarily complicate manufacturing control while still achieving the performance target of at least 160 mAh/g.
3Quantity of substance
If primary particle diameter is reduced to enhance electrochemical activity, then charge capacity improves, but measurement and characterization difficulty increases
Solution Approach 1:
The patent addresses measurement difficulty by controlling particle morphology in multiple dimensions - specifying primary particle diameter (170-340 nm) while also defining secondary particle structure and overall shape. This multi-dimensional characterization approach provides more robust measurement references and enables better control of electrochemical activity through controlled surface area-to-volume ratio.
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 optimized material achieves a first charge capacity of at least 160 mAh/g, enhancing the electrochemical performance and stability of solid-state batteries for EV and HEV applications.
Implementation Method 1
The material is synthesized using a process involving lithium transition metal-based compounds, Zr alkoxide, and an oxidizing atmosphere to optimize electrochemical performance
Implementation Method 2
The material is synthesized using a process involving lithium transition metal-based compounds, Zr alkoxide, and an oxidizing atmosphere to optimize electrochemical performance
Data Source
AI summary
Positive electrode active material for solid-state batteries, comprising Li, M′, and oxygen, wherein M′ comprises:Ni in a content x between 50.0 mol % and 85.0 mol %,Co in a content y between 0.0 mol % and 40.0 mol %,Mn in a content z between 0.0 mol % and 40.0 mol %,dopants in a content a between 0.0 mol % and 2.0 mol %,Zr in a content b between 0.1 mol % and 5.0 mol %,wherein x+y+z+a+b is 100.0 mol %,whereinZrA=b(x+y+z+b),wherein the positive electrode active material has a Zr content ZrB is expressed as molar fraction compared to the sum of molar fractions of Co, Mn, Ni, and Zr all as measured by XPS analysis,wherein ZrB/ZrA>50.0,the positive electrode active material comprising secondary particles having a plurality of primary particlessaid primary particles having an average diameter between 170 nm and 340 nm.