Lithium Nickel Composite Oxide Positive Electrode Active Material
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current lithium nickel composite oxides used in lithium ion batteries have excess oxygen, which limits their performance in achieving optimal battery characteristics such as capacity, cycle characteristics, and rate characteristics, especially for large-scale applications like automobiles.
Innovation Solution
A positive electrode active material with the composition Li x Ni 1-y M y O 2+α, where M includes Co and other elements, with specific X-ray diffraction peak intensity ratios and calcination conditions to optimize oxygen content and crystal structure, enhancing electron conductivity and crystallinity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If lithium nickel composite oxide with excess oxygen is used, then oxygen content is increased, but battery characteristics such as capacity, cycle characteristics, and rate characteristics are not optimized
Solution Approach 1:
The invention changes the oxygen content parameter from excess oxygen to controlled oxygen deficiency (α value between -0.05 and 0.05), and adjusts the lithium content parameter (x value between 0.95 and 1.05) to optimize battery characteristics while maintaining structural stability
Solution Approach 2:
The invention uses composite materials by combining lithium nickel composite oxide with specific metal elements (Co, Mn, Al, Ti, V, Cr, Fe, Cu, Zn, Ga, Ge, Bi, Sn, Mg, Ca, B, or Zr) to achieve optimal battery performance through synergistic effects of different metal elements
2Ease of manufacture
If conventional lithium nickel composite oxide composition is used, then manufacturing is simplified, but electron conductivity and crystallinity are insufficient
Solution Approach 1:
The invention optimizes the stoichiometric parameters (x and α values) to achieve optimal electron conductivity and crystallinity while maintaining a relatively simple manufacturing process using conventional solid-state reaction methods
Solution Approach 2:
The invention introduces specific metal elements at controlled concentrations to enhance local electron conductivity and crystallinity in specific regions of the material structure without complicating the overall manufacturing process
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 provides a lithium ion battery with improved battery characteristics, including higher capacity, rate performance, and capacity retention, by controlling the oxygen content and crystal structure through precise composition and calcination methods.
Implementation Method 1
a ratio of peak intensity (Ps104) on (104) plane to peak intensity (Ps003) on (003) plane, which is (Ps104/Ps003), is 0.9 or less and 2θ of (110) plane is 64.6° or more according to powder X-ray diffraction
Implementation Method 2
with specific X-ray diffraction peak intensity ratios and calcination conditions to optimize oxygen content and crystal structure
Data Source
AI summary
The present invention provides a positive electrode active material for a lithium ion battery with excellent battery characteristics can be provided. The positive electrode active material for a lithium ion battery is represented by the following composition formula: LixNi1-yMyO2+α (in the formula, M represents at least one selected from Sc, Ti, V, Cr, Mn, Fe, Co, Cu, Zn, Ga, Ge, Al, Bi, Sn, Mg, Ca, B, and Zr, 0.9 ≤ x ≤ 1.2, 0 < y ≤ 0.7, and α > 0.1).