Effect of High-Voltage Additives on Formation of Solid Electrolyte Interphases in Lithium-Ion Batteries

Chen, Minjing; Huang, Yunbo; Shi, Zhepu; Luo, Hao; Liu, Zhaoping; Shen, Cai

doi:10.3390/ma15103662

Cited by 6 publications

(2 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The value of the charge cut-off voltage during the formation process has a significant impact on capacity release and retention. 24 Figure 1a depicts the formation of a Co-free Li-rich layered cathode at a voltage window of 2.0-4.7 V. The charge curve is composed of a slope and a platform, with a capacity of roughly 120 mAh.g −1 during the slope area, which corresponds to the reversible extraction of Li + from the LiTMO 2 structure, which is accompanied by the valence change of Ni and Co. 25 The capacity of the extended platform relates to the irreversible extraction of Li + as Li 2 O or the oxidation of O 2− from the Li 2 MnO 3 phase, 26 along with the formation of localized holes on the oxygen coordinated by Mn 4+ /Li + and structural rearrangement. 27 The discharge specific capacity of 224.1 mAh.g −1 indicates appropriate cathode activity; nevertheless, a charge cut-off voltage of 4.7 V accelerates the rate of voltage decay and capacity loss.…”

Section: Resultsmentioning

confidence: 99%

A Unique Formation Process on Rapidly Activating Oxygen Redox in Co-Free Li-Rich Layered Cathodes for Long-Cycle Batteries

Xiong,

Qiu,

Huang

et al. 2023

J. Electrochem. Soc.

View full text Add to dashboard Cite

The utilization of oxygen redox in a Co-free Li-rich layered cathode usually needs to enhance the upper voltage to over 4.6 V, which results in structural changes and electrolyte requests. It is necessary to find a suitable formation method in full batteries that can quickly activate oxygen redox to balance the available capacity and optimal voltage. Here, a series of formation methods with two charge-discharge cycles under cut-off voltage 4.5-4.7 V are explored in practical pouch cells. A tiny voltage plateau appeared at 4.58 V was observed after the formation methods, which did not damage the material’s structure intensity in the first cycle. The surface of the cathode was found to form a thin film of spinel structure during the first charge-discharge process which would support the structure to endure a voltage higher than 4.58 V in the second charge-discharge and completely activate the capacity of Li-rich cathode. According to this guidance, a new formation method was adopted by controlling the cut-off voltage during the cycle process. The new strategy achieves a discharge-specific capacity of 214 mAh.g-1 and capacity retention of 99.0% after 500 cycles under 0.5C. This method shows great advantages in time cost, capacity retention, and Coulomb efficiency.

show abstract

Section: Resultsmentioning

confidence: 99%

A Unique Formation Process on Rapidly Activating Oxygen Redox in Co-Free Li-Rich Layered Cathodes for Long-Cycle Batteries

Xiong,

Qiu,

Huang

et al. 2023

J. Electrochem. Soc.

View full text Add to dashboard Cite

show abstract

“…In recent years, lithium difluoro(oxalato)borate LiBF 2 (C 2 O 4 ) (abbreviated as LiDFOB) has been recognized by high-voltage lithium-ion batteries due to its excellent performance [21,22]. Unlike LiPF 6 , the decomposition of LiDFOB does not produce HF [23].…”

Section: Introductionmentioning

confidence: 99%

Determining the Oxidation Stability of Electrolytes for Lithium-Ion Batteries Using Quantum Chemistry and Molecular Dynamics

Evshchik,

Borisevich,

Ilyina

et al. 2024

Electrochem

View full text Add to dashboard Cite

Determining the oxidation potential (OP) of lithium-ion battery (LIB) electrolytes using theoretical methods will significantly speed up and simplify the process of creating a new generation high-voltage battery. The algorithm for calculating OP should be not only accurate but also fast. Our work proposes theoretical principles for evaluating the OP of LIB electrolytes by considering LiDFOB solutions with different salt concentrations in EC/DMC solvent mixtures. The advantage of the new algorithm compared to previous versions of the theoretical determination of the oxidation potential of electrolyte solutions used in lithium-ion batteries for calculations of statistically significant complexes, the structure of which was determined by the molecular dynamics method. This approach significantly reduces the number of atomic–molecular systems whose geometric parameters need to be optimized using quantum chemical methods. Due to this, it is possible to increase the speed of calculations and reduce the power requirements of the computer performing the calculations. The theoretical calculations included a set of approaches based on the methods of classical molecular mechanics and quantum chemistry. To select statistically significant complexes that can make a significant contribution to the stability of the electrochemical system, a thorough analysis of molecular dynamics simulation trajectories was performed. Their geometric parameters (including oxidized forms) were optimized by QM methods. As a result, oxidation potentials were assessed, and their dependence on salt concentration was described. Here, we once again emphasize that it is difficult to obtain, by calculation methods, the absolute OP values that would be equal (or close) to the OP values estimated by experimental methods. Nevertheless, a trend can be identified. The results of theoretical calculations are in full agreement with the experimental ones.

show abstract

Understanding and Design of Cathode–Electrolyte Interphase in High‐Voltage Lithium–Metal Batteries

Li,

He,

Jie

et al. 2024

Adv Funct Materials

View full text Add to dashboard Cite

The development of lithium–metal batteries (LMBs) has emerged as a mainstream approach for achieving high‐energy‐density energy storage devices. The stability of electrochemical interfaces plays an essential role in realizing stable and long‐life LMBs. Despite extensive and comprehensive research on the lithium anode interface, there is limited focus on the cathode interface, particularly regarding high‐voltage transition metal oxide cathode materials. In this review, the challenges associated with developing stable high‐voltage cathode materials are first discussed. Characterization techniques for understanding the composition and structure of the cathode–electrolyte interphase (CEI) are then introduced. Subsequently, recent developments in electrolyte design and interface modification for constructing a stable CEI are summarized. Finally, perspectives on future research trends for understanding and developing the high‐voltage CEI are discussed. This review can offer valuable guidance for understanding and designing the high‐voltage CEI, pushing forward the development of high‐energy‐density LMBs.

show abstract

Effect of High-Voltage Additives on Formation of Solid Electrolyte Interphases in Lithium-Ion Batteries

Cited by 6 publications

References 45 publications

A Unique Formation Process on Rapidly Activating Oxygen Redox in Co-Free Li-Rich Layered Cathodes for Long-Cycle Batteries

A Unique Formation Process on Rapidly Activating Oxygen Redox in Co-Free Li-Rich Layered Cathodes for Long-Cycle Batteries

Determining the Oxidation Stability of Electrolytes for Lithium-Ion Batteries Using Quantum Chemistry and Molecular Dynamics

Understanding and Design of Cathode–Electrolyte Interphase in High‐Voltage Lithium–Metal Batteries

Contact Info

Product

Resources

About