Phosphorus-Doped Lithium Titanium Oxide Anode Conductivity
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Solution Overview
Problem
Lithium titanium oxide materials exhibit poor electrical conductivity, limiting the charge and discharge rates of lithium-ion batteries and leading to safety issues such as self-discharge and heat generation due to the formation of an irreversible solid electrolyte interface on carbon anodes.
Innovation Solution
Phosphorus-doped lithium titanium oxide materials with a spinel structure are synthesized by mixing oxide particles with a phosphorous compound and sintering at specific temperatures to enhance electrical conductivity and improve charge/discharge rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lithium titanium oxide is used as anode material, then structural stability and cycle life are improved, but electrical conductivity is poor
Solution Approach 1:
The patent applies parameter changes by doping lithium titanium oxide with phosphorus at specific concentrations (0.1-5 wt%) and controlling sintering temperature (700-950°C) and time (1-10 hours) to optimize the material's electrical conductivity while preserving its structural stability and long cycle life characteristics
Solution Approach 2:
The patent creates a composite material system by incorporating phosphorus into the lithium titanium oxide lattice structure, forming a doped composite that combines the structural advantages of Li4Ti5O12 with the electrical conductivity enhancement provided by phosphorus doping
2Speed
If particle size of lithium titanium oxide is reduced, then charge and discharge rates are improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies preliminary action by performing phosphorus doping and sintering processes during the initial material synthesis stage, creating uniformly sized particles with optimized conductivity before electrode fabrication, thereby simplifying subsequent manufacturing steps while achieving fast charge/discharge performance
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 phosphorus-doped lithium titanium oxide anodes demonstrate improved electrical conductivity, faster charge and discharge rates, and extended cycle life, mitigating safety issues and maintaining battery capacity at high charge/discharge rates.
Implementation Method 1
phosphorus-doped lithium titanium oxide material
Implementation Method 2
sintering the dried product in a first sintering atmosphere at a temperature in a range of from 700 to 950 degrees Celsius for a time of from 1 to 10 hours
Data Source
AI summary
A material of phosphorus-doped lithium titanium oxide with spinel structure includes a plurality of lithium titanium oxide particles, wherein a portion or the entirety of the surface layer of the lithium titanium oxide particle is doped with phosphorus. The surface layer is from 1 to 10 nanometers in thickness. Alternatively, the entire lithium titanium oxide particle can be doped with phosphorus. The material can be in powdered form, including a plurality of micro-scale particles each constituted by a plurality of the lithium titanium oxide particles.