Composite Cathode Active Material for High-Energy Lithium Batteries
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Solution Overview
Problem
Existing rechargeable lithium batteries face challenges in achieving high energy density, high operating voltage, and high conductivity, which are crucial for meeting the demands of modern electronic devices and electric vehicles.
Innovation Solution
A positive electrode active material comprising first and second particles with specific chemical compositions and particle sizes, where the first particles are olivine-based lithium compounds and the second particles are lithium nickel-based composite oxides, combined in a specific ratio to enhance performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If high energy density and high operating voltage are pursued, then battery capacity and power output improve, but conductivity decreases
Solution Approach 1:
The patent employs a composite positive electrode active material comprising Li1.2Ni0.13Co0.1Mn0.54O2 particles with a dual-layer coating structure. The core shell composite architecture combines different materials with complementary properties: the core provides high voltage capacity while the shell layers enhance conductivity and stability, resolving the contradiction between high energy density and conductivity
Solution Approach 2:
The patent applies localized coating treatment where the surface of the Li1.2Ni0.13Co0.1Mn0.54O2 particles is selectively modified with a dual-layer coating. This local quality change enhances conductivity at the particle surface without altering the bulk composition that provides high voltage, thereby improving conductivity while maintaining high energy density
2Ease of manufacture
If conventional positive electrode materials are used, then manufacturing is simpler, but energy density and operating voltage are insufficient
Solution Approach 1:
The patent modifies the composition parameters of the positive electrode active material by using Li1.2Ni0.13Co0.1Mn0.54O2 with specific stoichiometric ratios and applying a dual-layer coating with controlled thicknesses. These parameter changes achieve high energy density and operating voltage while maintaining compatibility with conventional manufacturing processes
Solution Approach 2:
The composite structure of Li1.2Ni0.13Co0.1Mn0.54O2 with dual-layer coating combines multiple materials in a hierarchical architecture. This composite approach achieves superior energy density and voltage characteristics while using scalable synthesis methods that are adapted from conventional battery material manufacturing
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 achieves high energy density, high operating voltage, and improved conductivity, resulting in enhanced battery performance, particularly at low temperatures.
Implementation Method 1
These batteries may produce electrical energy through oxidation and reduction reactions during the intercalation and deintercalation of lithium ions at the positive electrode and negative electrode
Data Source
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AI summary
A positive electrode active material for a rechargeable lithium battery includes first particles including a compound of Chemical Formula 1 (containing Mn) having a first average particle diameter, and second particles including a compound of Chemical Formula 2 (containing Co) having a second average particle diameter that is greater than the first average particle diameter, where the content of the first particles is greater than the content of the second particles, and a ratio of the Mn content to the Co content in the positive electrode active material is about 7:1 to about 12:1. Also disclosed are a positive electrode including the positive electrode active material, and a rechargeable lithium battery including the positive electrode.