Titanium-Doped Cathode Material for High-Voltage Lithium Batteries
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Solution Overview
Problem
Existing rechargeable lithium batteries face challenges in achieving high energy density, high operating voltage, and improved low-temperature characteristics while maintaining a long lifespan.
Innovation Solution
A positive electrode active material comprising titanium-doped olivine-based lithium compounds with controlled primary particle sizes and a coating layer, enhancing electrical conductivity and structural stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional positive electrode active materials are used, then the battery structure is simple, but the energy density and operating voltage are limited
Solution Approach 1:
The patent employs composite materials by combining olivine-based lithium compounds with multiple dopant elements (titanium, aluminum, magnesium, zirconium, vanadium, zinc, niobium, potassium, yttrium, boron, or copper) to create a positive electrode active material that achieves high energy density and operating voltage while maintaining structural stability and electrical conductivity
Solution Approach 2:
The patent applies local quality by introducing specific dopant elements at controlled concentrations (100-5000 ppm) into the olivine-based lithium compound structure, where each dopant element serves a specific function such as titanium for electrical conductivity enhancement and aluminum for structural stability, thereby optimizing local properties to achieve overall high energy density
2Use of energy by moving object
If high operating voltage is achieved through material composition, then energy density improves, but electrical conductivity decreases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the concentration of dopant elements (100-5000 ppm) and the ratios of metal elements (Mn:Fe:Co = 4:5:1 to 1:4:5) in the olivine-based lithium compound, thereby optimizing the balance between operating voltage and electrical conductivity through compositional parameter adjustment
Solution Approach 2:
The patent uses composite materials by incorporating multiple dopant elements simultaneously (titanium combined with aluminum, magnesium, zirconium, vanadium, zinc, niobium, potassium, yttrium, boron, or copper) to achieve synergistic effects that enhance both operating voltage and electrical conductivity
3Reliability
If particle size is reduced to improve conductivity, then electrical conductivity improves, but structural stability deteriorates
Solution Approach 1:
The patent applies parameter changes by controlling particle size within the 5-50 μm range and dopant concentration within 100-5000 ppm, thereby optimizing the balance between electrical conductivity and structural stability through precise parameter control
4Ease of operation
If good low-temperature characteristics are achieved, then battery performance at low temperature improves, but lifespan is reduced
Solution Approach 1:
The patent applies parameter changes by optimizing the dopant concentration (100-5000 ppm) and particle size (5-50 μm) to achieve a balance between low-temperature characteristics and lifespan, where the controlled dopant levels enable good low-temperature performance without excessive structural degradation
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, low-temperature performance, and extended lifespan.
Implementation Method 1
a first particle including titanium (Ti) in an amount (of Ti in the first particle) from about 1000 ppm to about 9000 ppm
Implementation Method 2
A rechargeable lithium battery may include 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 produced by oxidation and reduction reactions when the lithium ions are intercalated and deintercalated into/from the positive electrode and the negative electrode
Data Source
AI summary
A positive electrode active material for a rechargeable lithium battery, a positive electrode containing the same, and a rechargeable lithium battery including the same as provided. A positive electrode active material includes titanium (Ti) in an amount of about 1000 ppm to about 9000 ppm, at least one primary particle, the primary particle having a size of about 50 nm to about 300 nm, and a compound represented by Formula 1:wherein, in Formula 1 above, 0.8≤a≤1.2, 0.2≤x≤0.8, 0≤y≤0.05, 0≤b≤0.05, and M is at least one element selected from the group consisting of Al, Mg, Zr, V, Zn, Nb, K, Y, B, and Cu.