Related Experiment Video
Updated: Jul 6, 2025
05:33
Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
Published on: August 12, 2013
21.7K
Constructing an Anion-Braking Separator to Regulate Local Li+ Solvation Structure for Stabilizing Lithium Metal
Zibo Zhang1,2, Jian Wang3,4, Haozhe Qin2
1Hunan Province Key Laboratory of Chemical Power Source, College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China.
ACS Nano
|January 5, 2024
Summary
Researchers developed an anion-braking separator to control lithium metal battery dendrites. This method enhances lithium-ion behavior, achieving a long lifespan and high efficiency for safer, high-performance batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Battery Technology
Background:
- Lithium metal batteries (LMBs) offer high energy density but suffer from lithium dendrite formation.
- Dendrites arise from uneven lithium-ion (Li+) behavior and reactivity with electrolytes.
- Controlling dendrite growth is crucial for LMB safety and performance.
Purpose of the Study:
- To uniformly enhance Li+ desolvation and diffusion in LMBs.
- To suppress lithium dendrite formation using an anion-braking separator.
- To understand and modify ion behaviors for dendrite-free LMBs.
Main Methods:
- Constructed a 2D lithiated-montmorillonite (LiMMT) anion-braking separator.
- Blade-coated LiMMT on commercial separators to optimize Li+ solvation shells.
- Investigated Li+ and anion behaviors using experimental, theoretical, and spectroscopic methods.
Main Results:
- Achieved a Li plating/stripping lifespan of 1800 hours.
- Demonstrated an average Coulombic efficiency of 98.8% at 3.0 mAh cm-2.
- Fabricated full cells (Li-LFP, Li-NCM523) with nearly 100% capacity retention.
Conclusions:
- The anion-braking separator effectively regulates Li+ solvation and suppresses dendrites.
- Optimized ion behavior is key to achieving high Coulombic efficiency and cycle life.
- This strategy provides a pathway for developing safe and high-performance dendrite-free LMBs.
Keywords:
Li diffusion kineticsanion-braking effectlithium dendritelithium metal batteriessolvation shell structureMore Related Videos
Related Concept Videos
02:48Ionic Bonding and Electron Transfer
41.6K
Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.
41.6K
03:45Formation of Complex Ions
23.7K
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...
23.7K
01:17Ion Exchange
593
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
593
00:56Extraction: Advanced Methods
447
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
447
03:12Batteries and Fuel Cells
27.4K
A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
27.4K
01:19Ionic Strength: Effects on Chemical Equilibria
1.5K
The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary...
In this solution, the primary...
1.5K