Surface Modified Lithium Titanate for Battery Gas Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Lithium titanate batteries exhibit poor cycle performance at high temperatures and produce excessive gas, leading to a shortened service life due to high catalytic activity.
Innovation Solution
Surface modification of lithium titanate with deactivating groups such as —O—P—RR′R″, —O—P—(OR)R′R″, —O—P—(OR)(OR′)R″, and —O—P—(OR)(OR′)(OR″) bonded via a bond or bridge, reducing catalytic activity and gas production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lithium titanate is used as cathodic material, then cycle performance and service life are improved, but high temperature performance deteriorates and gas production increases
Solution Approach 1:
A surface modifying agent is introduced as an intermediary substance between lithium titanate particles and the electrolyte. This agent forms a protective film on the particle surfaces, mediating the interaction to reduce catalytic activity while maintaining electrochemical performance. The modifying agent contains functional groups that coordinate with titanium atoms, effectively suppressing gas production at high temperatures without compromising cycle life.
Solution Approach 2:
The invention creates a composite structure by coating lithium titanate particles with surface modifying agents. This composite approach combines the excellent electrochemical properties of lithium titanate with the protective characteristics of the modifying agent, achieving both high cycle performance and improved high temperature stability while reducing gas evolution.
2Duration of action of stationary object
If lithium titanate is used as cathodic material, then service life is extended, but gas production increases leading to shortened service life
Solution Approach 1:
The surface modifying agent converts the harmful high catalytic activity of lithium titanate surfaces into a beneficial low catalytic activity state. By coordinating with titanium atoms on the particle surfaces, the modifying agent transforms the active sites that cause gas production into stable complexes, effectively converting the harmful catalytic property into a beneficial gas-suppressing property while maintaining long service life.
3Object-generated harmful factors
If surface modification is applied, then catalytic activity is reduced and gas production decreases, but manufacturing complexity increases
Solution Approach 1:
The surface modification is performed as a preliminary treatment step before battery assembly. Lithium titanate particles are pre-coated with the surface modifying agent in a simple one-step process, forming a stable protective film that reduces catalytic activity. This preliminary action ensures gas production is suppressed from the outset, eliminating the need for complex in-situ modifications during battery manufacturing.
Solution Approach 2:
The invention simplifies the modification process by changing the chemical parameters of the surface treatment. Instead of complex multi-step procedures, a single surface modifying agent with specific functional groups is used to achieve effective coating. The process parameters are optimized to enable simple mixing and drying steps, reducing manufacturing complexity while maintaining effective gas suppression.
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 surface modification effectively reduces gas production and enhances high temperature storage and cycle performance of lithium ion batteries by stabilizing titanium and minimizing contact with other molecules.
Implementation Method 1
the deactivating groups that are distributed on the surface of the lithium titanate are —O—P—RR′R′′, —O—P—(OR)R′R′′, —O—P—(OR)(OR′)R′′, and —O—P—(OR)(OR′)(OR′′)... the deactivating groups are bonded to lithium titanate via a bond or a bridge
Implementation Method 2
The exemplary surface modification of lithium titanate can keep lithium titanate away from contacting other molecules, effectively lowering its catalytic activity, reducing the gassing of lithium ion batteries
Data Source
AI summary
A surface modified lithium titanate and preparation method thereof is provided. In the surface modified lithium titanate, the deactivating groups distributed on the surface of the lithium titanate are —O—P—RR′R″, —O—P—(OR)R′R″, —O—P—(OR)(OR′)R″, and —O—P—(OR)(OR′)(OR″), where R, R′ and R″ are identical or different C1˜C8 alkyl or alkenyl groups. The deactivating groups are bonded to the lithium titanate via a bond or a bridge. The exemplary surface modified lithium titanate can effectively lower its catalytic activity, reduce the gassing of lithium ion batteries, and therefore improve the high temperature storage and high temperature cycle performance of lithium titanate batteries. The exemplary preparation method is simple, has great repeatability, a low cost, low pollution to the environment, and is suitable for industrial production.