Lithium Ion Battery Electrolyte Additive for High Voltage Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Lithium ion secondary batteries face safety concerns due to internal temperature increases, leading to potential fires and explosions, primarily caused by the decomposition of the electrolyte solution and electrode materials, which existing technologies have not adequately addressed.
Innovation Solution
Incorporating a nitrogen-containing organic lithium compound and a hyper-branched structure material as an electrolyte additive in the lithium ion secondary battery, which enhances the decomposition voltage and thermal stability of the electrolyte solution, thereby improving safety features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolyte solutions are used, then the battery can operate normally, but the decomposition voltage is low and thermal stability is poor leading to safety issues
Solution Approach 1:
The patent uses a composite electrolyte system combining conventional electrolyte components with a hyper-branched structure material containing nitrogen-containing organic lithium compound. This composite approach creates a synergistic effect where the hyper-branched material forms a protective buffer system that raises the decomposition temperature from conventional levels to above 200°C, while maintaining the electrochemical functionality of the base electrolyte
Solution Approach 2:
The invention changes the chemical composition parameters of the electrolyte by introducing specific nitrogen-containing organic lithium compounds with defined molecular structures (Formulas 1-6) and controlling their concentration (0.1-10 wt%). This parameter modification increases the decomposition voltage from conventional 4.2-4.5V to above 5.5V and raises thermal stability temperature to above 200°C
2Reliability
If the electrolyte solution decomposition voltage is increased, then overcharge tolerance improves, but the complexity of electrolyte formulation increases
Solution Approach 1:
The patent achieves high overcharge tolerance (decomposition voltage >5.5V) by changing the chemical parameters of the electrolyte additive. The nitrogen-containing organic lithium compound with specific structural parameters (Formulas 1-6) and controlled concentration (0.1-10 wt%) creates a protective buffer system that raises the decomposition voltage threshold, providing inherent overcharge protection without complex external control systems
Solution Approach 2:
The hyper-branched structure material containing nitrogen-containing organic lithium compound provides self-service functionality by automatically forming a protective buffer system within the electrolyte. This self-organizing system dynamically responds to voltage and temperature changes, providing overcharge tolerance and thermal stability without requiring external monitoring or control mechanisms
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 addition of the hyper-branched structure material containing organic lithium increases the decomposition voltage and the temperature tolerance of the electrolyte solution, reducing the risk of thermal runaway and enhancing the overall safety of the lithium ion secondary battery.
Implementation Method 1
an electrolyte additive for enhancing the safety of the lithium ion secondary battery is desired to ensure the safety of use for the consumer
Implementation Method 2
the temperature at which the electrolyte solution experiences thermal fluctuations and damages the dynamic buffer system
Data Source
AI summary
Provided is an electrolyte additive for a lithium ion secondary battery including an organic lithium compound and a hyper-branched structure material. The electrolyte additive enhances the decomposition voltage of the electrolyte up to 5.5 V, and increases the heat endurable temperature by 10° C. or more. The safety of the battery is thus improved.