Lewis acid-base interactions between polysulfides and metal organic framework in lithium sulfur batteries
Jianming Zheng1, Jian Tian, Dangxin Wu
1Energy and Environmental Directorate, ‡Fundamental and Computational Science Directorate, and §Environmental Molecular Science Laboratory, Pacific Northwest National Laboratory , 902 Battelle Boulevard, Richland, Washington 99352, United States.
Nano Letters
|April 8, 2014
Summary
This study introduces a novel Ni-based metal-organic framework (Ni-MOF) to stabilize lithium-sulfur (Li-S) batteries. The Ni-MOF effectively immobilizes polysulfides, significantly improving battery capacity retention and cycle life.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Lithium-sulfur (Li-S) batteries offer high theoretical energy density but suffer from rapid capacity degradation.
- Polysulfide dissolution is a primary cause of poor cycle stability in Li-S batteries.
- Effective strategies are needed to mitigate polysulfide shuttle and enhance Li-S battery performance.
Purpose of the Study:
- To develop a novel material for immobilizing polysulfides in Li-S batteries.
- To investigate the performance of a Ni-based metal-organic framework (Ni-MOF) in Li-S battery cathodes.
- To understand the mechanism of polysulfide confinement by the Ni-MOF.
Main Methods:
- Synthesis and characterization of a Ni-based metal-organic framework (Ni-MOF), Ni6(BTB)4(BP)3.
- Fabrication of Li-S battery cathodes incorporating the Ni-MOF/sulfur composite.
- Electrochemical testing, including cycling performance and capacity retention measurements.
Main Results:
- The Ni-MOF effectively immobilized polysulfides through physical and chemical interactions.
- Li-S batteries with Ni-MOF/sulfur composite achieved 89% capacity retention after 100 cycles at 0.1 C.
- Synergistic effects of interwoven mesopores and Lewis acidic Ni(II) centers contributed to enhanced cycling stability.
Conclusions:
- The novel Ni-MOF demonstrates significant potential for stabilizing Li-S batteries.
- Immobilization of polysulfides via Ni-MOF is a viable strategy to overcome capacity degradation.
- This work paves the way for practical applications of high-energy Li-S batteries.
More Related Videos
07:20Screening of Coatings for an All-Solid-State Battery Using In Situ Transmission Electron Microscopy
Published on: January 20, 2023
4.1K
07:55Elemental-sensitive Detection of the Chemistry in Batteries through Soft X-ray Absorption Spectroscopy and Resonant Inelastic X-ray Scattering
Published on: April 17, 2018
11.8K
Related Concept Videos
02:33Lewis Acids and Bases
38.1K
In 1923, G. N. Lewis proposed a generalized definition of acid-base behavior in which acids and bases are identified by their ability to accept or to donate a pair of electrons and form a coordinate covalent bond.
A coordinate covalent bond (or dative bond) occurs when one of the atoms in the bond provides both bonding electrons. For example, a coordinate covalent bond occurs when a water molecule combines with a hydrogen ion to form a hydronium ion. A coordinate covalent bond also results when...
A coordinate covalent bond (or dative bond) occurs when one of the atoms in the bond provides both bonding electrons. For example, a coordinate covalent bond occurs when a water molecule combines with a hydrogen ion to form a hydronium ion. A coordinate covalent bond also results when...
38.1K
02:16Lewis Acids and Bases
13.9K
This lesson delves into Lewis acids and bases in the context of the octet rule for electron-deficient compounds. Here, the concept is discussed, emphasizing the group 13 elements like boron or aluminium. Since group 13 elements possess three valence electrons, they form trivalent compounds with a sextet of electrons and a vacant orbital for the central atom. Consequently, these electron-deficient compounds accept electrons from other species to complete their octet in a chemical reaction. They...
13.9K
02:26Preparation and Reactions of Sulfides
4.3K
Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
4.3K
03:45Formation of Complex Ions
18.8K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
18.8K
04:02Weak Acid Solutions
31.3K
Few compounds act as strong acids. A far greater number of compounds behave as weak acids and only partially react with water, leaving a large majority of dissolved molecules in their original form and generating a relatively small amount of hydronium ions. Weak acids are commonly encountered in nature, being the substances partly responsible for the tangy taste of citrus fruits, the stinging sensation of insect bites, and the unpleasant smells associated with body odor. A familiar example of a...
31.3K
01:19Acid Mine Drainage
112
Mining activities that disturb sulfide-rich rocks, particularly those containing pyrite (FeS₂), initiate a cascade of geochemical and microbiological processes with serious environmental implications. When exposed to air and water, pyrite undergoes oxidation, releasing sulfate, ultimately forming sulfuric acid and mobilizing heavy metals into surrounding water systems. This phenomenon, known as acid mine drainage (AMD), results in low pH waters laden with toxic elements that threaten...
112