Composite Cathode Material for High-Voltage Low-Temperature Li Batteries
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Solution Overview
Problem
Existing rechargeable lithium batteries face challenges in achieving high energy density, high operating voltage, and low-temperature performance.
Innovation Solution
A positive electrode active material comprising first particles with an olivine structure and second particles with a spinel structure, where the first particles are predominant, enhancing conductivity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a single-phase positive electrode active material is used, then the material structure is simple, but the energy density and operating voltage are limited
Solution Approach 1:
The patent employs a composite positive electrode active material consisting of two distinct phases: an olivine phase (LiFePO4-based) and a spinel phase (LiMn2O4-based). This composite structure allows the material to simultaneously achieve high energy density from the olivine phase and high operating voltage from the spinel phase, while maintaining structural stability through the synergistic interaction between the two phases.
2Reliability
If conventional positive electrode materials are used, then the manufacturing process is simple, but the conductivity and low-temperature performance are insufficient
Solution Approach 1:
The patent optimizes the compositional parameters of the composite material, specifically controlling the molar ratio of the olivine phase to spinel phase, and adjusting the doping elements (such as Mg, Al, or Ti) to achieve optimal electrical conductivity and low-temperature performance. By precisely controlling these parameters during synthesis, the material achieves high reliability without significantly complicating the 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 results in a rechargeable lithium battery with improved energy density, operating voltage, and low-temperature properties.
Implementation Method 1
a positive electrode active material comprising first particles comprising a compound of Chemical Formula 1 that has an olivine structure
Implementation Method 2
second particles comprising a compound of Chemical Formula 2 that has a spinel structure
Implementation Method 3
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
Implementation Method 4
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 comprising a compound having an olivine structure, and second particles comprising a compound having a spinel structure. The amount of the first particles is greater than the amount of the second particles. Also disclosed are positive electrodes including the positive electrode active materials, and rechargeable lithum batteries including the positive electrodes.