Mg-Ti Doped Olivine Cathode Material for High-Voltage Li Batteries
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Solution Overview
Problem
Existing rechargeable lithium batteries face challenges in achieving high energy density, high operating voltage, high conductivity, and high charge-discharge efficiency, while maintaining a long lifespan.
Innovation Solution
A positive electrode active material comprising olivine-based lithium compounds doped with Mg and Ti, with specific compositional ranges and particle sizes, enhances the performance of rechargeable lithium batteries by improving mixture density and charge-discharge efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional positive electrode active materials are used, then the battery can operate, but the energy density and operating voltage are insufficient
Solution Approach 1:
The patent changes the compositional parameters of the olivine-based lithium compound by doping with Mg and Ti elements, and optimizes the particle size distribution (D10, D50, D90 values), to achieve higher energy density and operating voltage while maintaining performance consistency
Solution Approach 2:
The patent creates a composite material system by doping Mg and Ti elements into the olivine-based lithium compound structure, combining multiple elements to achieve synergistic effects that improve both energy density and operational reliability
2Power
If the positive electrode active material is optimized for high energy density, then the operating voltage increases, but the conductivity may deteriorate
Solution Approach 1:
The patent optimizes the particle size distribution parameters (D10, D50, D90) and compositional ratios of Mg and Ti doping to balance operating voltage and conductivity, achieving high power output without sacrificing electrical conductivity
3Productivity
If the charge-discharge efficiency is improved, then the energy density increases, but the lifespan may decrease
Solution Approach 1:
The patent optimizes the particle size distribution and compositional parameters within specific ranges to achieve high charge-discharge efficiency while maintaining structural stability for long lifespan
Solution Approach 2:
The patent applies local doping of Mg and Ti elements at specific concentrations (2500-5000 ppm total) to enhance charge-discharge efficiency at critical sites while preserving the overall structural integrity for extended lifespan
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 long lifespan, with improved conductivity and charge-discharge efficiency, making it suitable for various electronic devices and electric vehicles.
Implementation Method 1
the first particle is doped with Mg and Ti, and a total doping amount of Mg and Ti is about 2500 ppm to about 5000 ppm
Implementation Method 2
A rechargeable lithium battery includes a positive electrode and a negative electrode, each containing an active material capable of intercalation and deintercalation of lithium ions
Implementation Method 3
Electrical energy is generated (produced) by oxidation and reduction reactions as lithium ions are intercalated and deintercalated into/from the positive electrode and the negative electrode
Data Source
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AI summary
A rechargeable lithium battery including a positive electrode active material, the positive electrode active material including a first particle containing a compound represented by Formula 1 and having a first average particle diameter: Formula 1 Lia1Mnx1Fey1Bz1PO4-b1 wherein, in Formula 1 above, 0.8≤a1≤1.2, 0.45≤x1≤0.55, 0.45≤y1≤0.55, 0<z1≤0.05, 0≤b1≤0.05, and x1 + y1 + z1 = 1, and B is Mg and Ti.