Lithium Ion Battery Positive Electrode Material Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for evaluating and improving the positive electrode active material for lithium ion batteries face challenges in achieving high capacity density and cycle durability due to the presence of lithium carbonate, which degrades battery performance and safety.
Innovation Solution
A novel approach using a composite oxide with a layered structure represented by Li x (Ni y M 1-y )O z, where M includes metals like Mn, Co, and others, with specific atomic ratios and peak intensity ratios in FT-IR spectra to optimize lithium carbonate content and nickel ratio for enhanced capacity density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lithium carbonate content is reduced to improve battery safety and performance, then reliability improves, but manufacturing precision becomes more difficult to control
Solution Approach 1:
The patent replaces complex battery assembly and testing mechanisms with a simplified FT-IR spectroscopy measurement system. By measuring the infrared absorption spectrum of the positive electrode active material, the lithium carbonate content can be quickly and accurately determined without assembling the entire battery, thus improving manufacturing precision while maintaining reliability standards.
Solution Approach 2:
The patent creates a spectral fingerprint copy of the positive electrode active material using FT-IR spectroscopy. The infrared absorption spectrum serves as a characteristic copy that contains information about lithium carbonate content, allowing evaluation of material quality without physical battery assembly and performance testing.
2Productivity
If FT-IR spectroscopy is used to evaluate lithium carbonate content, then measurement speed improves and development time is shortened, but measurement precision may be insufficient for optimal battery performance
Solution Approach 1:
The patent transforms the FT-IR measurement from a qualitative or semi-quantitative tool to a precise quantitative measurement system. By establishing the specific relationship between absorption intensity at 1450 cm⁻¹ and lithium carbonate content, and by optimizing measurement parameters such as wave number selection and intensity ratio calculations, the method achieves both high speed and high precision in evaluating positive electrode active material quality.
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 method allows for increased capacity density and improved battery performance by optimizing the lithium carbonate content and nickel ratio, contributing to faster development and quality control in lithium ion battery production.
Implementation Method 1
evaluating the properties thereof on the basis of the infrared absorption spectrum obtained by FT-IR
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
Disclosed is a positive electrode active material that provides an improved capacity density. Specifically disclosed is a positive electrode active material for a lithium ion battery with a layered structure represented by LixNiyM1-y)Oz (wherein M represents at least one element selected from a group consisting of Mn, Co, Mg, Al, Ti, Cr, Fe, Cu, and Zr; x is in the range from 0.9 to 1.2; y is in the range from 0.3 to 0.95; and z is in the range from 1.8 to 2.4), wherein, when a value obtained by dividing an average of peak intensities observed between 1420 and 1450 cm-1 and between 1470 and 1500 cm-1 by the maximum intensity of a peak appearing between 520 and 620 cm-1 in an infrared absorption spectrum obtained by FT-IR is represented by A, A satisfies the following relational formula: 0.20y-0.05 ≤ A≤ 0.53y-0.06.