Cited by One Stone for Multiple Birds: Copolymer with Multifunctional Groups Boosts the Cycling Stability of Lithium Cobalt Oxide Cathodes at 4.5 V

Electrolyte design weakens lithium-ion solvation energy for a fast-charging and long-cycling Si anode DOI

Min Li, Shuai Li, Yan Dong

et al.

Chemical Science, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

Silicon (Si) is considered a promising anode material for next-generation lithium-ion batteries due to its high theoretical specific capacity and earth-abundancy. However, challenges such as significant volume expansion, unstable solid electrolyte interphase (SEI) formation in incompatible electrolytes, slow transport lead poor cycling rate performance. In this work, it demonstrated that superior cyclability capability of Si anodes can be achieved using ethyl fluoroacetate (EFA) fluoroethylene carbonate (FEC) solvents with low binding energy Li+ but sufficiently relative dielectric constants. By weakening the interaction between solvent, barrier desolvation process lowered, while ensuring conductivity diffusion Li+. As result, silicon-carbon optimized exhibits excellent performance, work reversibly 1709.1 mAh g-1 proceeds over 250 cycles retains 85.2% at 0.2C. Furthermore, Si/C‖LiFePO4 (LFP) full cell shows an extended service life more than 500 cycles. This offers valuable insights into design weakly solvating electrolytes high-performance Si-based batteries.

Language: Английский

Citations

Electrolyte chemistry towards ultra‐high voltage (4.7 V) and ultra‐wide temperature (−30 to 70 °C) LiCoO2 batteries DOI

Wenming Yang, Wen Chen, Hanqing Zou

et al.

Angewandte Chemie International Edition, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 7, 2025

LiCoO2 batteries for 3 C electronics demand high charging voltage and wide operating temperature range, which are virtually impossible existing electrolytes due to aggravated interfacial parasitic reactions sluggish kinetics. Herein, we report an electrolyte design strategy based on a partially fluorinated ester solvent (i.e., DFEA) that achieves balance between weak Li+-solvent interactions, sufficient salt dissociation, stability, superior thermal stability address the aforementioned challenges. The resulting high-voltage wide-temperature (HWE) not only possesses low desolvation energy, fast Li+ transport, oxidation excellent thermal-abuse tolerance non-flammability, but also enables formation of both inorganic-rich cathode interphase (CEI) solid (SEI). Owing above merits, this HWE endows highly stable operation cathodes under ultra-high 4.7 V Graphite || in ultra-wide range -30 70 °C. Meanwhile, 1.7 Ah-level 4.6 pouch cell with energy density 240 Wh kg-1 delivers cycling representing significant advancement towards batteries.

Language: Английский

Citations

Low‐Concentration Electrolyte Engineering for Rechargeable Batteries DOI

Zijun Wang, Xiaolin Guo,

Yueyao Dong

et al.

Advanced Materials, Journal Year: 2025, Volume and Issue: unknown

Published: April 21, 2025

Abstract Low‐concentration electrolytes (LCEs) present significant potential for actual applications because of their cost‐effectiveness, low viscosity, reduced side reactions, and wide‐temperature electrochemical stability. However, current electrolyte research predominantly focuses on regulation strategies conventional 1 m electrolytes, high‐concentration localized leaving design principles, optimization methods, prospects LCEs inadequately summarized. face unique challenges that cannot be addressed by the existing theories approaches applicable to three common mentioned above; thus, tailored provide development guidance are urgently needed. Herein, a systematic overview recent progress in is provided subsequent directions suggested. This review proposes core challenge high solvent ratio LCEs, which triggers unstable organic‐enriched electrolyte/electrode interface formation anion depletion near anode. On basis these issues, modification including passivation construction solvent‒anion interaction optimization, used various rechargeable battery systems. Finally, role advanced simulations cutting‐edge characterization techniques revealing LCE failure mechanisms further highlighted, offering new perspectives future practical application next‐generation batteries.

Language: Английский

Citations

Cation–Anion Regulation Engineering in a Flame-Retardant Electrolyte toward Safe Na-Ion Batteries with Appealing Stability DOI

Yi‐Hu Feng,

Chengye Lin,

Hui-Huan Qin

et al.

Journal of the American Chemical Society, Journal Year: 2025, Volume and Issue: unknown

Published: May 1, 2025

Great electrochemical stability and intrinsic safety are of critical significance in realizing large-scale applications Na-ion batteries (NIBs). Unfortunately, the notorious decomposition electrolyte undesirable side reactions on cathode-electrolyte interphase (CEI) pose major obstacles to practical implementation NIBs. Besides, flammability traditional carbonate-based electrolytes raises increasing concerns about batteries. Herein, a flame-retardant all-fluorinated is proposed achieve an anion-aggregated inner solvation shell by modulating cation-anion interactions through low-coordination number cosolvent. The more electrochemically antioxidant fluorinated solvents anion-dominated interfacial chemistry contribute construction both mechanically chemically stable F-rich CEI. Such thin, homogeneous effectively inhibits parasitic reaction, strengthens stability, enables fast Na+ diffusion kinetics interface. When employing this electrolyte, Na0.95Ni0.4Fe0.15Mn0.3Ti0.15O2 (NFMT) cathode delivers remarkable discharge capacity up 169.7 mAh g-1, with cycling at 1C for 500 cycles. Impressively, NFMT//hard carbon pouch cells such also steady operation 100 cycles 0.5C 86.8% remaining. This study offers reference developing high-performance electrolytes.

Language: Английский

Citations

Reevaluating the Effect of a LiF-Containing Solid Electrolyte Interphase on Lithium Metal Anodes DOI

Chengkun Liu,

Kaixiang Ren,

Shuilin Wu

et al.

Nano Letters, Journal Year: 2025, Volume and Issue: unknown

Published: April 30, 2025

Developing high-energy-density lithium metal batteries (LMBs) necessitates robust solid electrolyte interphases (SEIs) capable of enduring prolonged cycling. While fluoride (LiF) is recognized as crucial for anode (LMA) protection, the effects different LiF sources in SEIs remain insufficiently understood. In this study, we systematically introduce single fluorine sources─anion LiF, solvent and native LiF─into a fluoride-free system to elucidate impact originating from on SEI composition properties. Results reveal that performance depends not only content but also coexisting organic components. During deep cycling, solvent-derived LiF-rich SEIs, containing elevated organics, offer superior LMA protection ability. These maintain structural integrity during significant volume changes, effectively suppressing dead Li formation achieving enhanced Coulombic efficiency. This work reexamines LiF's protective mechanisms while advancing chemistry understanding, providing critical insights developing high-performance LMBs.

Language: Английский

Citations

The role of flame-retardant electrolytes in lithium-ion batteries: custom design for improved battery-level safety DOI

Yaxuan Fu,

Xiaozhi Jiang,

Chenyang Shi

et al.

Chinese Chemical Letters, Journal Year: 2025, Volume and Issue: unknown, P. 110972 - 110972

Published: Feb. 1, 2025

Language: Английский

Citations

The design of novel lithium salt additives: 4-benzonitrile-1,3-double (trimethylboric acid) lithium (LBTA) to endow inherent superior stability in high voltage lithium ion batteries DOI

Lucheng Li, Meiling Liu, Peng Yang

et al.

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 162078 - 162078

Published: April 1, 2025

Language: Английский

Citations

Electrochemical Self‐Assembly of Boron‐Based Cathode‐Electrolyte Interphase to Stabilize 4.65 V LiCoO₂ DOI

Hengyu Ren,

Xiaohu Wang, Wangyang Ding

et al.

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: April 26, 2025

Abstract The cathode‐electrolyte interphase (CEI) is vital for the stability of LiCoO 2 (LCO) beyond 4.55 V (vs Li/Li + ). Herein, full coverage boron‐based CEI achieved on LCO surface via utilizing self‐wetting synthesis boric acid (i.e., B‐LCO), accompanying with subsequent electrochemical self‐assembly process upon cycles. Initially, B‐LCO coated borate deposits (size 10–20 nm), then it melts and fully covers sintering, leading to artificial CEI, which directly reduces side reactions induced by highly oxidative Co 4+ /O n− (0 < n 2). Significantly, during cycling, in situ interfacial between species LiF promote formation crystalline LiB 6 O 9 F components, showing mechanically robust Li conductive characteristics. Due synergism structurally tough rocksalt (RS) phase, not only more reversible phase transition uniform (de)lithiation are achieved, but also particle cracks deterioration issues effectively inhibited. As a result, B‐LCO||Li cells show excellent cycle stability, high retention 84.0% 500 cycles 3–4.65 V.

Language: Английский

Citations

The Resurrection of Fe in layered cathode materials for sodium-ion batteries DOI

Z. F. Guan,

Guoyao Pang,

Meng Li

et al.

Materials Today, Journal Year: 2025, Volume and Issue: unknown

Published: April 1, 2025

Language: Английский

Citations

In situ multifunctional surface design for high-performance 4.6 V LiCoO2 DOI

Shih‐Lin Wu,

Tongxing Lei,

Zhiyu Ding

et al.

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 163516 - 163516

Published: May 1, 2025

Language: Английский

Citations