Lithium-Ion Anode Cyclic Compound Coating High-Temperature Stability
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Solution Overview
Problem
Current lithium ion secondary batteries face challenges in achieving superior battery characteristics, particularly in high-temperature storage conditions, where the anode configuration significantly impacts performance, and existing solutions like cyclic polyether and cryptand do not fully address the need for improved performance and stability.
Innovation Solution
Incorporating a cyclic compound with specific structures, such as the first, second, and third cyclic compounds, into the anode of lithium ion secondary batteries, which utilize metal elements and halogen atoms for coordinate bonding, allowing for efficient lithium insertion and extraction while suppressing expansion and contraction of the anode active material layer during charge and discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cyclic polyether or cryptand is used in the anode, then some battery characteristic improvement is achieved, but superior battery characteristic and stability especially under high-temperature storage conditions cannot be obtained
Solution Approach 1:
The patent employs a composite anode material comprising graphite particles coated with a specific cyclic compound containing metal elements (M1-M4) and halogen atoms (Y1-Y4). This composite structure combines the high capacity of graphite with the protective and stabilizing properties of the cyclic compound, achieving superior battery characteristics and high-temperature stability that neither material could achieve alone.
Solution Approach 2:
The invention modifies the chemical composition and structure of the anode by incorporating a cyclic compound with specific parameters: metal elements (M1-M4) coordinated with halogen atoms (Y1-Y4), where n1-n4 are specific integers. This parameter optimization enhances the anode's electrochemical performance and thermal stability, resolving the contradiction between general reliability and high-temperature adaptability.
2Reliability
If the anode configuration is modified to improve battery characteristic, then performance is enhanced, but device complexity increases
Solution Approach 1:
The cyclic compound is applied as a pre-formed coating on the graphite particles before electrode assembly. This preliminary action creates a stable, protective layer that simplifies the overall manufacturing process while enhancing battery characteristics, avoiding the need for complex post-processing or multi-step anode construction.
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 these cyclic compounds enhances battery characteristics by improving charge-discharge efficiency, reducing electrical resistance, and maintaining high capacity retention, leading to superior performance and stability compared to batteries without these compounds.
Implementation Method 1
the cyclic compound contains one or more of a first cyclic compound represented by the following formula (1), a second cyclic compound represented by the following formula (2), and a third cyclic compound represented by the following formula (3)
Implementation Method 2
suppressing expansion and contraction of the anode active material layer during charge and discharge
Data Source
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AI summary
A lithium ion secondary battery includes a cathode, an anode, and an electrolytic solution. The anode contains a cyclic compound and the cyclic compound contains one or more of a first cyclic compound, a second cyclic compound, and a third cyclic compound.