LTO Anode Battery with Phosphate Additive for Gas Suppression
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Solution Overview
Problem
Lithium secondary batteries using lithium titanium oxide (LTO) as an anode active material face safety issues due to gas generation during activation and charge/discharge processes, which degrades battery performance and safety.
Innovation Solution
Incorporating a phosphate-based compound as an additive in the electrolyte, which acts as a crosslinking agent in gel polymer electrolytes, stabilizes the electrode interface, reduces side reactions, and inhibits gas generation, thereby enhancing battery safety and lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If LTO is used as an anode active material, then the battery potential is increased and electrolyte reduction is prevented, but hydrogen gas is generated during activation and charge/discharge processes, reducing battery safety
Solution Approach 1:
A phosphate-based compound is introduced as an intermediary substance in the electrolyte that mediates between the LTO anode and the electrolyte system. This intermediary forms a protective interface layer that prevents direct harmful interactions while maintaining the high potential benefits of LTO, thereby suppressing hydrogen gas generation without sacrificing the voltage advantage
Solution Approach 2:
The invention converts the harmful catalytic effect of LTO that generates hydrogen gas into a beneficial effect by using the phosphate-based compound to redirect the reaction pathway. The phosphate compound utilizes the LTO surface activity to form protective films and stabilize the electrode interface, transforming the gas-generating catalysis into interface-stabilizing catalysis that enhances battery safety and performance
2Stability of the object's composition
If a crosslinking agent is added to gel polymer electrolyte, then the electrolyte structure is stabilized, but the crosslinking agent remains uncured and increases viscosity, making uniform impregnation difficult and degrading battery properties
Solution Approach 1:
The invention changes the chemical parameters of the crosslinking agent by selecting a phosphate-based compound with specific molecular structure and reactivity characteristics. This parameter change allows the crosslinking agent to achieve complete curing at lower concentrations, reducing residual uncured material and viscosity increase, thereby enabling uniform impregnation while maintaining electrolyte structure stability
Solution Approach 2:
The invention creates a composite electrolyte system combining the phosphate-based crosslinking agent with the gel polymer matrix and lithium salt. This composite material approach ensures synergistic effects where the phosphate compound enhances crosslinking efficiency and interfacial stability while maintaining appropriate viscosity and impregnation characteristics, solving both structural stability and manufacturing ease requirements
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 use of a phosphate-based compound in the electrolyte with LTO as an anode active material improves electrochemical stability, reduces gas generation, and extends battery lifespan, ensuring high safety and performance.
Implementation Method 1
acts as a crosslinking agent in gel polymer electrolytes
Implementation Method 2
stabilizes the electrode interface, reduces side reactions, and inhibits gas generation
Data Source
AI summary
Disclosed is a secondary battery including an electrode assembly, which includes a cathode, an anode and a separator interposed therebetween, and an electrolyte, wherein the anode includes lithium titanium oxide (LTO) as an anode active material and the electrolyte contains a phosphate-based compound as an additive.