Fluorocarbon-Coated Lithium Titanate Anodes for Gas-Safe Conductivity
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Solution Overview
Problem
Lithium titanate anodes in lithium-ion batteries face issues with reduced electrical conductivity and gas production due to direct contact with electrolytes, leading to safety concerns like thermal runaway and explosion.
Innovation Solution
A fluorocarbon modified layer is coated on lithium titanate to enhance electrical conductivity and prevent gas formation by inhibiting reactions with electrolytes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lithium titanate is used as anode material to avoid lithium dendrite formation, then safety is improved, but electrical conductivity is reduced
Solution Approach 1:
The patent uses a composite structure where lithium titanate particles are coated with conductive carbon material. This composite anode material combines the safety advantages of lithium titanate (avoiding lithium dendrite formation) with the electrical conductivity of carbon coating, thereby resolving the contradiction between safety and electrical conductivity.
2Stability of the object's composition
If lithium titanate is used as anode material to improve cyclic stability, then structural stability is improved, but gas production occurs due to direct contact with electrolyte
Solution Approach 1:
The patent introduces conductive carbon material as an intermediary layer between lithium titanate and the electrolyte. This carbon coating acts as a protective barrier that prevents direct contact between lithium titanate and electrolyte, thereby eliminating gas production while preserving the cyclic stability of lithium titanate.
3Ease of manufacture
If graphite is used as anode material to achieve low cost, then manufacturing cost is reduced, but lithium dendrite formation occurs during overcharging
Solution Approach 1:
The patent changes the working voltage parameter by using lithium titanate (1.55V) instead of graphite, which has a lower operating voltage. This parameter change eliminates lithium dendrite formation during overcharging while maintaining cost-effectiveness through the use of abundant lithium titanate materials and simple carbon coating processes.
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 modified lithium titanate anode exhibits improved electrical conductivity, reduced polarization, and enhanced cycle stability, maintaining high capacity and safety under various discharge rates and high temperatures.
Implementation Method 1
a modified layer coated on the lithium titanate material, wherein the modified layer is a fluorocarbon
Implementation Method 2
since lithium titanate does not tend to form a solid electrolyte layer during the discharge process, it is relatively common for lithium titanate to come into direct contact with the electrolyte in electrochemical reactions, resulting in side reactions that may lead to gas production
Data Source
AI summary
Disclosed is an anode material for a lithium-ion secondary battery, comprising: lithium titanate and a modified layer coating on the surface of the lithium titanate, wherein the modified layer is a fluorocarbon. The anode material forms a surface modification containing C—F bond on the surface of lithium oxide and can be used for the lithium electronic secondary battery, and the lithium electronic secondary battery comprises the anode material can avoid the formation of solid electrolyte layer on the surface of the electrode and obtain good conductivity and avoid gas production.