Triple-Structure Cathode Material for Voltage and Cycle Life
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Solution Overview
Problem
Existing rechargeable lithium batteries face challenges in achieving high energy density, high average voltage, and excellent lifetime characteristics while maintaining economic feasibility.
Innovation Solution
A positive electrode active material comprising first particles with an olivine structure, second particles with a spinel structure, and third particles with a layered structure, along with a conductive material and binder, to enhance energy density and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a single-type positive electrode active material is used, then the manufacturing process is simple, but the energy density and lifetime characteristics cannot be optimized simultaneously
Solution Approach 1:
The patent employs a composite positive electrode active material consisting of three distinct particle types with different crystal structures: olivine-structured particles (LiFe0.4Mn0.5Ti0.1PO4), spinel-structured particles (LiMn2-x-yNixCoyO4), and layered-structured particles (Li1-x-yNixMnyO2). Each particle type contributes different properties - olivine provides structural stability, spinel provides high voltage, and layered provides high capacity. This composite approach enables simultaneous optimization of energy density and lifetime characteristics while maintaining economic feasibility through controlled composition ratios.
2Quantity of substance
If high-nickel layered structure particles are used to increase energy density, then the capacity increases, but the structural stability and lifetime deteriorate
Solution Approach 1:
The patent merges three different particle structures into a single composite electrode material system. The high-nickel layered particles (providing high capacity) are combined with olivine-structured particles (providing structural stability) and spinel-structured particles (providing voltage stability). This merging allows the electrode to achieve high energy density from the layered particles while the other two particle types compensate for the structural instability and lifetime issues of high-nickel materials.
3Power
If multiple types of positive electrode active material particles are mixed, then the energy density and voltage characteristics improve, but the manufacturing complexity increases
Solution Approach 1:
The patent optimizes the manufacturing process by controlling specific parameters: the particle size distribution (D10, D50, D90 values), the composition ratios of the three particle types (first, second, and third particles), and the crystal structure characteristics. By establishing precise parameter ranges for these variables, the patent achieves high average voltage and energy density while maintaining manufacturing feasibility through standardized production processes.
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 proposed electrode material achieves high energy density, high average voltage, and improved lifetime characteristics, while being economically viable, through optimized particle structures and compositions.
Implementation Method 1
A rechargeable lithium battery produces electrical energy through the oxidation and reduction reactions when lithium ions are intercalated into and deintercalated from the positive electrode and negative electrode
Data Source
AI summary
Disclosed are positive electrode active materials for a rechargeable lithium battery and positive electrodes including the positive electrode active materials. The positive electrode active material comprises first particles comprising a compound having an olivine structure, second particles having a spinel structure, and third particles having a layered structure. The amount of the third particles is about 10 parts by weight to about 50 parts by weight based on 100 parts by weight of the positive electrode active material.