LTO Electrode Stabilization via Pretreated Electrolyte
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Solution Overview
Problem
Lithium titanate oxide (LTO) electrodes in lithium-ion batteries generate significant gas, particularly hydrogen, at elevated temperatures, leading to reduced battery capacity and lifespan, necessitating high-temperature aging processes that decrease initial capacity.
Innovation Solution
Pretreating the electrolyte with oxide species such as silicon dioxide, titanium dioxide, or lithium oxide to form protective compounds that minimize reactions with LTO, reducing gas formation and maintaining high capacity and long life without the need for aging processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LTO electrodes are used in lithium-ion batteries, then high power and long cycle life are achieved, but significant gas generation occurs at elevated temperatures
Solution Approach 1:
The patent introduces an intermediary substance (oxide species such as SiO2, TiO2, or Al2O3) that mediates between the LTO electrode and the electrolyte. This intermediary forms a protective coating on the LTO surface that prevents direct harmful interactions while allowing beneficial electrochemical reactions to proceed, thereby suppressing gas generation without compromising cycle life
Solution Approach 2:
The patent applies preliminary action by pre-treating the LTO electrode with oxide species before battery assembly and operation. This pre-coating process establishes a protective layer in advance that prevents gas-generating side reactions during subsequent high-temperature charging cycles, eliminating the need for post-formation aging processes
2Object-generated harmful factors
If high temperature aging is applied to reduce gas formation, then gas generation is suppressed, but initial battery capacity is reduced by 10% or more
Solution Approach 1:
The patent performs the protective coating action preliminarily during electrode manufacturing, before battery assembly. This eliminates the need for subsequent high-temperature aging processes that would consume lithium and reduce initial capacity, as the protective layer is already in place to prevent gas-generating side reactions
Solution Approach 2:
The patent converts the potentially harmful high-temperature conditions into a beneficial process by using controlled thermal treatment during coating application to enhance the formation of the protective oxide layer. This transforms what would normally be a gas-generating condition into a process that strengthens the protective barrier, preventing future gas formation without capacity loss
3Reliability
If electrolyte pretreatment with oxide species is performed, then gas formation is suppressed and capacity is maintained, but additional manufacturing steps are required
Solution Approach 1:
The patent merges the protective coating step with existing electrode manufacturing processes. The oxide species coating is applied during standard electrode production operations, combining the protection function with routine manufacturing without requiring separate dedicated equipment or processes, thereby minimizing the impact on ease of manufacture
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 pretreated electrolyte suppresses gas generation by forming a protective coating on LTO electrodes, maintaining high capacity and extending battery life, while avoiding the capacity loss associated with high-temperature aging.
Implementation Method 1
contacting an electrolyte including lithium hexafluorophosphate (LiPF6), lithium tetrafluoroborate (LiBF4), and combinations thereof and a carbonate solvent with an oxide species... A reaction occurs to form a pretreated electrolyte including a compound
Data Source
AI summary
An electrolyte can be pretreated by contacting with an oxide species (e.g., SiO2, SiOx, where 1≤x≤2, TiO2). The electrolyte comprises LiPF6 and a carbonate solvent. A reaction occurs to form a pretreated electrolyte comprising a compound selected from the group consisting of: MaPx′OyFz, MaPx′OyFzCnHm, and combinations thereof, where when P in the formula is normalized to 1 so that x′ is equal to about 1, 0<y≤4, 0<z≤6, 0≤a≤3, 0 ≤n≤20, 0≤m≤42, and M is selected from Li, Na, K, Mg, Ca, B, Ti, Al, and combinations thereof. Lithium-ion electrochemical cells including lithium titanate oxide (LTO) using such a pretreated electrolyte have reduced reactivity and gas formation.