Lithium Titanate Anode Coating for Battery Safety and Conductivity
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Solution Overview
Problem
Conventional lithium-ion battery anodes made of graphite suffer from lithium dendrite generation, safety issues, poor high-rate discharge performance, low specific capacity, and water absorption, while lithium titanate alternatives have high electric potential, poor conductivity, and inconsistent processability.
Innovation Solution
A titanium system composite comprising a lithium titanium composite oxide coated with a lithium compound, such as lithium zirconate or lithium carbonate, is developed, with a method involving a colloid mixture, drying, heating, and grinding to enhance cycle performance and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lithium titanate is used as anode material, then safety problems are eliminated, but electric potential becomes high causing high battery voltage
Solution Approach 1:
The patent uses a composite structure where lithium titanate particles are coated with carbon material and lithium compound to create a composite anode material that combines the safety benefits of lithium titanate with improved electrical properties from the carbon coating
Solution Approach 2:
The patent modifies the surface properties of lithium titanate by coating it with carbon and lithium compounds, changing the electrical conductivity parameter without altering the bulk safety characteristics of the lithium titanate core
2Reliability
If lithium titanate is used as anode material, then safety is improved, but electrical conductivity becomes poor resulting in poor high-rate discharge performance
Solution Approach 1:
The patent creates a composite anode material by coating lithium titanate particles with conductive carbon material and lithium compounds, forming a core-shell structure that provides both safety and improved electrical conductivity
Solution Approach 2:
The carbon coating acts as an intermediary layer between the lithium titanate particles and the electrolyte, facilitating electron transport and improving electrical conductivity while maintaining the safety benefits of the lithium titanate core
3Reliability
If lithium titanate is used as anode material, then safety is improved, but specific capacity becomes low with theoretical value of 175 mAh/g
Solution Approach 1:
The patent combines lithium titanate with carbon materials and lithium compounds to create a composite structure that increases the overall specific capacity while maintaining the safety characteristics of the lithium titanate core
Solution Approach 2:
The patent uses a core-shell structure where the lithium titanate particles are nested within a coating of carbon and lithium compounds, allowing the inner core to provide safety while the outer layers contribute additional capacity
4Reliability
If lithium titanate material is used, then safety is improved, but consistency and processability become poor
Solution Approach 1:
The patent creates a composite material where the carbon coating and lithium compound layers improve the processability and consistency of lithium titanate during battery manufacturing while preserving its safety benefits
Solution Approach 2:
The coating process modifies surface parameters of lithium titanate particles, improving their dispersibility, consistency, and processability in electrode fabrication without changing the bulk safety properties
5Reliability
If lithium titanate material is used, then safety is improved, but water absorption increases causing battery inflation
Solution Approach 1:
The carbon coating and lithium compound layers act as intermediary barrier layers between the lithium titanate particles and the environment, preventing water absorption while maintaining the safety characteristics of the core material
Solution Approach 2:
The patent uses thin film coatings of carbon and lithium compounds that form protective shells around lithium titanate particles, preventing water absorption and battery inflation while preserving the safety benefits
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 titanium system composite exhibits improved high-rate charge and discharge capabilities, enhanced cycle performance, and increased safety, with the lithium compound cladding forming compact secondary particles that improve battery performance.
Implementation Method 1
NH 3 decomposes surface Li 4 Ti 5 O 12 to conductive TiN at high temperature
Implementation Method 2
NH 3 decomposes surface Li 4 Ti 5 O 12 to conductive TiN
Implementation Method 3
mixing a lithium titanium composite oxide with the colloid mixture uniformly and then drying to obtain a composition
Data Source
AI summary
The present disclosure discloses a titanium system composite comprising a lithium titanium composite oxide and a lithium compound cladding the lithium titanium composite oxide. The present disclosure further discloses a preparation method of the titanium system composite and an electrode material for batteries or capacitors comprising a titanium system composite.