Related Experiment Video
Updated: May 11, 2026
05:33
Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
Published on: August 12, 2013
Electrochemically Induced Interphase by Complex Hydride Anions in Argyrodite Solid Electrolytes for Stable Lithium
Sangho Lee1, Hyunseo Park2, Ye-Eun Park1
1Department of Chemistry, Gwangju Institute of Science and Technology (GIST), Gwangju, Republic of Korea.
Summary
Complex hydride anions in solid electrolytes create a protective Li-B-H interphase, enhancing lithium metal battery stability. This breakthrough enables stable cycling over 1000 cycles at high current densities.
Area of Science:
- Materials Science
- Electrochemistry
- Solid-state Chemistry
Background:
- Argyrodite solid electrolytes offer potential for enhanced ionic conductivity and interfacial stability in lithium metal batteries.
- The impact of complex hydride anions on the stability of the lithium metal interface is not well understood.
Purpose of the Study:
- To elucidate the role of complex hydride anions in influencing interfacial reactions at the lithium metal anode during electrochemical cycling.
- To compare the interfacial behavior of complex hydride-substituted argyrodites with conventional halide argyrodites.
Main Methods:
- Electrochemical testing of Li5PS4(BH4)2 and Li6PS5Cl argyrodite electrolytes with Li metal anodes.
- Analysis of interfacial reaction products and interphase formation using advanced characterization techniques (implied).
Main Results:
- BH4- anions in Li5PS4(BH4)2 rapidly form a stable Li-B-H interphase with Li metal, preventing sulfide framework decomposition.
- Conventional Li6PS5Cl electrolytes exhibit continuous decomposition into Li2S and Li3P, leading to unstable cycling.
- Engineered electrochemical operation, including gradual current increase, promoted the formation of the beneficial Li-B-H interphase.
Conclusions:
- Complex hydride anions dictate distinct and crucial interfacial reaction pathways at the lithium metal anode.
- The formation of a Li-B-H-rich interphase is key to achieving stable lithium metal anode performance in solid-state batteries.
- Rational design of electrochemical operation can leverage complex hydride anions for high-performance all-solid-state lithium metal batteries.
Related Concept Videos
01:30The Electrical Double Layer
In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
03:12Batteries and Fuel Cells
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...
03:45Formation of Complex Ions
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...
02:48Ionic Bonding and Electron Transfer
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.
03:00Electrolysis
In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
04:02Weak Acid Solutions
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...