Zr-Enriched Nickel Cathode Composition for Solid-State Battery Efficiency
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Solution Overview
Problem
Existing lithium nickel-based oxide positive electrode active materials for solid-state batteries with Zr compounds have low efficiency due to suboptimal Zr content and distribution.
Innovation Solution
A positive electrode active material for solid-state batteries comprising Li, M', and oxygen, where M' includes Ni, Mn, Co, and Zr, with a specific range of mol % content and a Zr content determined by XPS analysis, and a carbon content that optimizes the ZrX to C ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Zr compound is added to lithium nickel-based oxide positive electrode active material, then the stability and electrochemical performance is improved, but the manufacturing complexity and precision requirements increase due to need to control specific Zr content range and distribution
Solution Approach 1:
The patent applies parameter changes by precisely controlling the Zr content within specific ranges (0.01-5.0 mol% in the oxide, with surface concentration 0.1-5.0 at%) and adjusting the ZrX/C ratio (52-0.413·x to 42-0.413·x). These parameter optimizations improve electrochemical performance while managing manufacturing complexity through defined specification ranges.
Solution Approach 2:
The patent implements local quality by creating a Zr-enriched surface layer on the lithium nickel-based oxide particles. The surface concentration of Zr (0.1-5.0 at%) is higher than the bulk concentration (0.01-5.0 mol%), providing enhanced stability and electrochemical performance at the particle surface where it is most needed for interface reactions, while maintaining simpler bulk composition.
2Productivity
If Zr content is increased to improve efficiency, then the electrochemical performance improves, but the manufacturing precision required to control Zr distribution and content increases
Solution Approach 1:
The patent resolves this contradiction by defining specific parameter ranges for Zr content (0.01-5.0 mol% bulk, 0.1-5.0 at% surface) and the ZrX/C ratio (52-0.413·x to 42-0.413·x). These quantified parameters enable improved battery efficiency while providing clear manufacturing specifications that control Zr distribution without requiring excessive precision.
Solution Approach 2:
The patent applies partial action by introducing Zr in controlled amounts (0.01-5.0 mol%) rather than high concentrations. This partial addition is sufficient to improve efficiency through surface enrichment and electrochemical enhancement, while avoiding the manufacturing precision challenges that would arise from higher Zr content requirements.
3Ease of manufacture
If Zr is added via evaporation method, then the material is formed, but the Zr content ratio over carbon content becomes too high leading to low battery efficiency
Solution Approach 1:
The patent resolves this contradiction by controlling the ZrX/C ratio within specific ranges (52-0.413·x to 42-0.413·x) based on the Ni content parameter x. This parameter control ensures that Zr is added via evaporation or other methods while maintaining optimal Zr concentration relative to carbon, thereby achieving both ease of manufacture and improved battery efficiency.
Solution Approach 2:
The patent implements feedback by using the ZrX/C ratio as a controlled parameter that depends on the Ni content (x). The relationship ZrX/C = 52-0.413·x to 42-0.413·x provides a feedback mechanism where the optimal Zr-to-carbon ratio is adjusted based on the nickel content, ensuring efficient battery performance while maintaining manufacturing feasibility.
Data Source
AI summary
A positive electrode active material comprises Li, M′, and oxygen. M′ comprises Ni in a content x, Mn in a content y, Co in a content z, D in a content a, Zr in a content b, wherein 55.0 mol %≤x≤95.0 mol %, 0.0 mol %≤y≤40.0 mol %, 0.0 mol %≤z≤40.0 mol %, 0.0 mol %≤a≤2.0 mol %, and 0.01 mol %≤b≤5.0 mol %. D is at least one element other than Li, Ni, Mn, Co, and O. The positive electrode active material has a Zr content ZrX and a carbon content C. ZrX is expressed as a molar fraction compared to the sum of molar fractions of Co, Mn, Ni, and Zr. C is expressed in wt. % by total weight of the positive electrode active material. The ratio of ZrX to C is between 52−0.413·x and 42−0.413·x.