TMCM Electrode Stabilization via G-R-g Additive Self-Repair
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Solution Overview
Problem
Transition metal cyanometallate (TMCM) electrodes in metal-ion batteries suffer from structural degradation due to defects and vacancies, leading to limited cycle life and poor capacity retention, as they interact with water and undergo electrochemical reactions.
Innovation Solution
Incorporating electrolyte additives represented as G-R-g, where G and g are nitrogen, sulfur, or oxygen-based groups, and R is an alkene or alkane, to interact and coordinate with metal ions around defects and vacancies, stabilizing the TMCM electrode structure and enhancing cycle lifetime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If TMCM electrodes are used in metal-ion batteries, then high energy density and high power density are achieved, but structural degradation occurs due to defects and vacancies, leading to limited cycle life
Solution Approach 1:
The patent introduces electrolyte additives (G-R-g compounds with nitrogen, sulfur, or oxygen-based groups) as intermediary substances that coordinate with metal ions around defects and vacancies in the TMCM electrode structure. These additives act as mediators that stabilize the electrode structure without interfering with the primary energy storage function, thereby resolving the contradiction between high energy density and limited cycle life
Solution Approach 2:
The electrolyte additives perform preliminary stabilization action by coordinating with metal ions at defect sites before significant structural degradation occurs. This preliminary coordination prevents the propagation of structural defects during charge-discharge cycles, maintaining electrode integrity over extended cycling while preserving high energy density
2Productivity
If TMCM electrodes undergo electrochemical reactions, then capacity is delivered, but vacancies are created and structure degrades, reducing capacity retention
Solution Approach 1:
The electrolyte additives enable a self-service mechanism where the electrode structure automatically repairs itself during electrochemical cycling. The G-R-g additives continuously coordinate with newly formed vacancies and undercoordinated metal ions, facilitating self-healing of structural defects without external intervention, thus maintaining capacity retention while enabling continuous capacity delivery
Solution Approach 2:
The system establishes a feedback mechanism where the state of electrode degradation (vacancy formation, metal ion coordination) is continuously monitored through electrochemical responses, and the electrolyte additives dynamically adjust their coordination to stabilize the structure. This feedback loop ensures that capacity retention is maintained even as electrochemical reactions proceed
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 additives effectively self-repair the TMCM electrodes by filling vacancies and reducing undercoordinated metal ions, significantly improving cycle life and capacity retention, as demonstrated by the retention of 92.6% initial capacity after 90 cycles compared to 70.1% without additives.
Implementation Method 1
the additives work by interacting and coordinating metal ions around the defects and vacancies
Implementation Method 2
the additives effectively self-repair the TMCM electrodes by filling vacancies
Data Source
AI summary
A method is provided for the self-repair of a transition metal cyanometallate (TMCM) battery electrode. The battery is made from a TMCM cathode, an anode, and an electrolyte including solution formed from a solvent and an alkali or alkaline earth salt. The electrolyte includes an additive represented as G-R-g: where G and g are independently include materials with nitrogen (N) sulfur (S), oxygen (O), or combinations of the above-recited elements; and where R is an alkene or alkane group. In response to charging and discharging the battery in a plurality of cycles, the method creates vacancies in a surface of the TMCM cathode. Then, the method fills the vacancies in the surface of the TMCM cathode with the electrolyte additive. An electrolyte and TMCM battery using the above-mentioned additives are also provided.