Lithium Secondary Battery Electrolyte With Metal babp Complex
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Solution Overview
Problem
Lithium secondary batteries exhibit lower capacity due to high resistance at the cathode/electrolyte interface, limiting their practical performance and lifespan.
Innovation Solution
Incorporating a metal 6,6′-bis(benzoylamino)-2,2′-bipyridine (babp) complex as an additive in the electrolyte to reduce interfacial resistance and enhance lithium ion transfer, thereby improving charge/discharge capacity and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolytes (organic, gel polymer, or solid) are used, then the battery can achieve basic operation, but the capacity is limited to below 169 mAh/g due to high interfacial resistance
Solution Approach 1:
The patent introduces a metal complex compound (containing metals such as Li, Na, K, Cu, Ag, Au, Zn, Cd, In, Ga, Al, or their combinations) as an electrolyte additive. This changes the chemical and electrical parameters of the electrolyte system, enabling the achievement of theoretical capacity (169 mAh/g or higher) by modifying the electrolyte's interaction with the cathode active material and reducing interfacial resistance
Solution Approach 2:
The metal complex compound acts as an intermediary substance in the electrolyte that mediates the interaction between the electrodes and electrolyte. It facilitates improved lithium ion transfer and reduces interfacial resistance, thereby enabling the battery to achieve theoretical capacity without changing the fundamental electrolyte type
2Volume of moving object
If the battery is designed for thin and compact applications, then it can fit smaller devices, but the capacity and performance are reduced
Solution Approach 1:
By adding metal complex compounds to the electrolyte, the patent improves the electrochemical performance parameters (capacity, charge/discharge characteristics) without changing the battery's physical dimensions. This allows thin and compact batteries to achieve theoretical capacity (169 mAh/g or higher), resolving the trade-off between size and performance
3Power
If the battery operates at higher current densities, then power output increases, but capacity utilization decreases due to high resistance
Solution Approach 1:
The metal complex compound additive modifies the electrolyte's electrical properties, reducing interfacial resistance. This enables the battery to maintain high capacity utilization even at higher current densities, allowing improved power output without sacrificing capacity
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 the metal babp complex in the electrolyte results in lithium secondary batteries with higher capacity and extended lifespan, demonstrated by increased initial discharge capacity and retention over cycles.
Implementation Method 1
a lithium ion conductive electrolyte; wherein the electrolyte contains a metal 6,6′-bis(benzoylamino)-2,2′-bipyridine (babp) complex
Implementation Method 2
a cathode containing a material that is capable of inserting and desorbing lithium ions
Implementation Method 3
an anode containing a material that is capable of occluding and releasing lithium metal or lithium ions
Data Source
AI summary
A lithium secondary battery is provided with a higher capacity and a longer life. The lithium secondary battery includes: a cathode containing a material that is capable of inserting and desorbing lithium ions; a lithium ion conductive electrolyte; and an anode containing a material that is capable of occluding and releasing lithium metal or lithium ions, wherein the electrolyte contains a metal 6,6′-bis(benzoylamino)-2,2′-bipyridine (babp) complex, which is a metal complex.