Chelating Resin Negative Electrode Material for Dendrite Suppression
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Solution Overview
Problem
Conventional chelating resins in negative electrodes of lithium-ion batteries fail to effectively prevent the formation of metal dendrites, which limits the battery's performance and cycle life.
Innovation Solution
A negative electrode active material comprising a chelating resin with a polymer skeleton and chelating functional groups, where the metal ion is connected via ionic or coordinate bonds, and a free small molecular compound with a chelating functional group is present in limited quantities, preventing metal dendrite formation by maintaining charge balance and fixing metal ions during charging and discharging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional chelating resin is used in the negative electrode, then the battery structure is simple and easy to manufacture, but the resin cannot effectively prevent metal dendrite formation, resulting in poor cycle life and low coulombic efficiency
Solution Approach 1:
The patent uses a composite chelating resin system comprising a polymer skeleton with chelating functional groups (such as iminodiacetic groups) combined with divalent metal ions (such as zinc ions). This composite structure leverages the synergistic effect between the polymer matrix and metal ions to enhance dendrite prevention capability while maintaining structural integrity and electrochemical performance.
Solution Approach 2:
The patent optimizes specific parameters including the mass ratio of chelating functional groups to metal ions, the crosslinking degree of the polymer skeleton, and the pore size distribution of the resin. By carefully controlling these parameters, the resin achieves optimal balance between ion transport efficiency and dendrite suppression, thereby improving cycle life and coulombic efficiency.
2Power
If high capacity lithium ion metal oxide is used in the positive electrode, then the battery achieves high output voltage and specific capacity, but the combination with conventional chelating resin leads to dendrite formation that limits performance
Solution Approach 1:
The chelating resin acts as an intermediary layer between the electrolyte and the electrode surface. The divalent metal ions in the resin strongly chelate with incoming metal ions, creating a protective interface that prevents direct deposition of metal dendrites while still allowing lithium ion transport. This intermediary mechanism enables the battery to achieve high power output without dendrite-related performance limitations.
Solution Approach 2:
The patent introduces chelating sites with specific local chemical properties (such as nitrogen and oxygen donor atoms in iminodiacetic groups) at the electrode-electrolyte interface. These localized chelating regions create preferential binding sites for metal ions, directing them away from dendrite-prone areas and promoting uniform ion distribution, thereby preventing dendrite formation while maintaining high 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 solution achieves high specific capacity, coulombic efficiency, and cycle stability in secondary batteries by effectively chelating and fixing divalent metal ions, thereby reducing dendrite growth and maintaining battery capacity over cycles.
Implementation Method 1
The metal ion is connected with the chelating resin by an ionic bond and/or a coordinate bond via the chelating functional group
Implementation Method 2
The metal ion is connected with the chelating resin by an ionic bond and/or a coordinate bond via the chelating functional group
Implementation Method 3
a chelating resin and a metal ion... the chelating functional group contains lone pairs of electrons of oxygen, nitrogen and phosphorus
Data Source
AI summary
A negative electrode active material, a negative electrode plate and a secondary battery. The negative electrode active material comprises a chelating resin and a metal ion. The chelating resin comprises a polymer skeleton and a chelating functional group. The chelating functional group is fixedly connected to the polymer skeleton via a chemical bond. The metal ion is connected with the chelating resin by an ionic bond and/or a coordinate bond via the chelating functional group. The chelating resin further comprises a free small molecular compound containing the chelating functional group. In the chelating resin, a mass percentage of the free small molecular compound containing the chelating functional is less than or equal to 1%. The metal ion is a divalent or multivalent metal ion. When the negative electrode active material is applied to the secondary battery, the secondary battery can achieve both high coulombic efficiency and high cycle stability.