Composite Cathode Material Balancing Battery Capacity and Efficiency
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Solution Overview
Problem
Existing rechargeable lithium batteries face challenges in achieving high energy density and efficiency, necessitating improvements in positive electrode active materials to meet the increasing demand for high-capacity batteries in devices such as mobile phones and electric vehicles.
Innovation Solution
A positive electrode active material comprising a combination of first particles with an olivine structure, second particles with a spinel structure, and third particles with a layered structure, optimized in weight ratios, along with a conductive material and binder, to enhance energy density and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a single positive electrode active material is used, then the battery structure is simple, but the energy density and operating voltage cannot be optimized simultaneously
Solution Approach 1:
The patent uses a composite material system consisting of three distinct positive electrode active materials with different crystal structures (olivine, spinel, and layered structures). Each material contributes different properties: the olivine structure provides stability, the spinel structure enhances conductivity, and the layered structure increases capacity. This composite approach allows simultaneous optimization of energy density and operating voltage while maintaining a manageable electrode design through controlled particle size distributions and weight ratios.
2Quantity of substance
If high-capacity materials are used to increase energy density, then the battery capacity improves, but the charge and discharge efficiency decreases
Solution Approach 1:
The patent applies local quality by creating a multi-component system where different materials are distributed throughout the electrode. The olivine-based material provides structural stability for efficient ion transport, the spinel-based material enhances electronic conductivity for faster charge transfer, and the layered material contributes high capacity. This spatial and functional distribution allows the electrode to simultaneously achieve high capacity and high charge-discharge efficiency by optimizing local properties throughout the material composite.
3Quantity of substance
If conventional positive electrode materials are used, then the manufacturing process is simple, but the operating voltage and energy density are insufficient for high-performance applications
Solution Approach 1:
The patent employs parameter changes by systematically varying the crystal structure types (olivine, spinel, layered), particle size ranges, and weight ratios of the three active materials. These parameter optimizations enable the electrode to achieve superior energy density and operating voltage characteristics. The manufacturing complexity is managed through defined composition ranges and standardized particle size specifications, making the enhanced material system practically implementable.
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 active material design achieves high energy density and efficiency, improving charge and discharge performance, low-temperature properties, and battery lifetime.
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
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AI summary
A positive electrode active material comprises first particles of a compound having an olivine structure, second particles of a compound having a spinel structure, and third particles of a compound having a layered structure. The first particles and the second particles constitute a main active material, which is present in about 80 parts by weight to about 90 parts by weight based on 100 parts by weight of the positive electrode active material. Also disclosed are positive electrodes including the positive electrode active materials, and recharageable lithum batteries including the positive electrodes.