Cathode Active Material Tungsten Lithium Coating
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Solution Overview
Problem
The battery characteristics of non-aqueous electrolyte secondary batteries using cathode active materials with tungsten and lithium compounds on lithium nickel complex oxide particles can vary, leading to inferior performance due to inconsistencies in tungsten content across particles.
Innovation Solution
A cathode active material is developed with coated lithium nickel complex oxide particles, where a compound containing tungsten and lithium is uniformly distributed on both the surface and internal primary particles, maintaining a relative standard deviation of tungsten content to metallic components at 0.4 or less, ensuring consistent tungsten distribution and improved lithium ion conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a compound containing tungsten and lithium is disposed on the surfaces of lithium nickel complex oxide particles to increase capacity and obtain high power output, then the energy density and power output are improved, but the battery characteristics vary and become inferior due to inconsistent tungsten content across particles
Solution Approach 1:
Lithium compound is disposed on the particle surfaces before tungsten compound, creating a preliminary layer that controls subsequent tungsten distribution. This preliminary action ensures uniform tungsten content across all particles, preventing the inconsistency that degrades battery characteristics while maintaining the high power output benefits of tungsten addition
Solution Approach 2:
The invention changes the concentration parameters of lithium and tungsten compounds within specific ranges (lithium: 0.01-0.5 mass%, tungsten: 0.01-5 mass%) to optimize both power output and consistency. By controlling these parameters and their ratio, the invention achieves uniform tungsten distribution that maintains reliable battery characteristics while delivering high power performance
2Quantity of substance
If tungsten compound is added to lithium nickel complex oxide particles to enhance capacity, then the energy density is improved, but the manufacturing precision of uniform tungsten distribution deteriorates
Solution Approach 1:
Lithium compound serves as an intermediary substance between the base lithium nickel complex oxide and the tungsten compound. This intermediary layer facilitates uniform distribution of tungsten across particle surfaces by providing a controlled interface for tungsten deposition, thereby achieving both high capacity enhancement and manufacturing precision
Solution Approach 2:
By adjusting the concentration parameters of both lithium compound (0.01-0.5 mass%) and tungsten compound (0.01-5 mass%) within optimized ranges, the invention achieves uniform tungsten distribution. The specific parameter control ensures that tungsten is evenly dispersed across all particles, maintaining high manufacturing precision while maximizing capacity
3Power
If compound containing tungsten and lithium is disposed on particle surfaces to improve output characteristics, then the power output is enhanced, but the reaction resistance increases due to non-uniform tungsten distribution
Solution Approach 1:
The preliminary disposal of lithium compound on particle surfaces creates a uniform foundation that prevents non-uniform tungsten distribution. This preliminary action ensures that when tungsten compound is added, it distributes evenly across all particles, maintaining low reaction resistance while still achieving enhanced output characteristics through tungsten addition
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
This approach stabilizes battery characteristics by reducing reaction resistance and enhancing output characteristics, leading to increased discharge capacity and improved cycle performance while maintaining uniform tungsten distribution across particles.
Implementation Method 1
a compound containing tungsten and lithium is disposed on the surface of lithium nickel complex oxide particles
Data Source
AI summary
A cathode active material for a non-aqueous electrolyte secondary battery including primary particles of a lithium nickel complex oxide represented by a general formula: LizNi1−x−yCoxMyO2+α, and secondary particles in which the primary particles aggregate, wherein a plurality of coated lithium nickel complex oxide particles are formed by disposing a compound containing tungsten and lithium on surfaces of the secondary particles and surfaces of the primary particles positioned inside the secondary particles, and wherein a relative standard deviation of a ratio of a number of atoms of tungsten to a number of atoms of a metallic component other than lithium contained in the coated lithium nickel complex oxide particles is 0.4 or lower.