Enhanced Structural Stability of Single-Crystalline Ni-Rich Cathode Enables Improved Cyclability in Pouch Cells

ACS Nano, Год журнала: 2025, Номер unknown

Опубликована: Апрель 4, 2025

Single-crystalline LiNi0.9Co0.05Mn0.05O2 (SCNCM90) cathode materials experience continuous capacity degradation during cycling, primarily due to irreversible structural transformations and oxygen loss. These alterations are driven by the local adjustment of in-layer interlayer transition metal ions as a result anionic cationic redox reactions. In this study, selenium (Se) titanium (Ti) were simultaneously incorporated into SCNCM90 structure enhance stability, inhibit reactions lattice oxygen, mitigate severe internal strain induced phase near end charge. Moreover, Se/Ti regulation in reduces Li+ migration barrier, suppresses Li/Ni cation mixing further stabilizes SCNCM90. The formation O-transition -Se bonds deep charging can reduce outward Oα- (α < 2) increase vacancy energy, thereby improving stability processes within Ti4+ promotes nanoscale mixed-phase layer on surface SCNCM90, enhancing reversibility H2-H3 transition. Additionally, alleviation enhanced significantly contribute long-term cyclic cathodes. Hence, modification material achieves retention 87.6% after 500 cycles at 1 C with 2.8-4.5 V, compared only 61.4% for undoped cathode. A 2.83 Ah pouch cell SCNCM90-0.6ST||graphite electrodes demonstrates long cycle life over cycles, 3.1% loss 3-4.25 V. This work reveals that mitigation particle cracking suppression release crucial improvements Ni-rich layered materials.

Язык: Английский

---

Functionalized Cellulose‐Based Binders for Lithium Cobalt Oxide Cathodes: Improving Stability and Lithium‐Ion Transport Under High Voltage

Macromolecular Rapid Communications, Год журнала: 2025, Номер unknown

Опубликована: Апрель 14, 2025

Abstract Lithium cobalt oxide (LCO) is a key material for high‐energy‐density lithium‐ion batteries, but its application at high voltages hindered by structural instability and interfacial side reactions. This study introduces functionalized cellulose‐based binder designed to address these challenges. By grafting polar groups onto cellulose, the material's crystallinity reduced, solubility improved, strong adhesion with enhanced ion transport achieved. The enables LCO cathodes retain 95.9% of their capacity after 200 cycles 4.6 V, significantly outperforming conventional polyvinylidene fluoride (PVDF) binders. Furthermore, reduces polarization facilitates diffusion, contributing improved electrode stability electrochemical performance. These results highlight potential binders as sustainable effective solutions stabilizing high‐voltage cathodes, paving way next‐generation batteries.

Язык: Английский

---

Ultra‐Soluble 1‐Azaphenothiazine Additive Stabilizes High‐Voltage LiCoO₂ for 500 Wh Kg⁻¹ Lithium Metal Pouch Cells

Advanced Materials, Год журнала: 2025, Номер unknown

Опубликована: Май 15, 2025

Abstract High‐voltage LiCoO 2 is a promising cathode candidate for achieving high‐energy lithium metal pouch cells. However, further application still hindered by irreversible structural degradation and severe interfacial side reactions that accelerate capacity decay. Herein, 1‐Azaphenothiazine (1‐APT) incorporated as slurry additive (1 g mL −1 in N‐methyl‐2‐pyrrolidone) to promote the optimization of interface during electrode coating process. The ultra‐soluble 1‐APT promotes formation inorganic‐rich components within cathode‐electrolyte interphase (CEI), mitigates reaction Co 4+ with electrolyte, enhances stability , thereby enabling 4.7 V an initial 229.8 mAh 73.2% retention after 200 cycles. More importantly, Li||LiCoO ‐1‐APT cells exhibit remarkable electrochemical performance, specific energies 515.7 497.4 484.9 Wh kg at discharge rates 0.5C, 1C, 2C, respectively. Notably, 5 Ah cell exhibited capability maintain energy density 411.4 100 cycles 0.5C. This work presents practical effective strategy optimizing interfaces, stabilization high‐voltage cathodes.

Язык: Английский

---

Structure Flexibility Enabled by Surface High-Concentration Titanium Doping for Durable Lithium-Ion Battery Cathodes

Journal of the American Chemical Society, Год журнала: 2025, Номер unknown

Опубликована: Май 19, 2025

Ni-rich layered oxides have emerged as the most promising cathode materials for next-generation lithium-ion batteries due to their high energy densities. However, strain-related instabilities, example, microcracks and rock-salt phase formation, present a significant threat battery performance. In this study, we successfully stabilize structure of LiNi0.8Co0.1Mn0.1O2 using flexible TiO6 octahedron units through high-concentration surface Ti doping. The can tolerate Jahn-Teller distortions other neighboring structural absence d electrons in Ti4+, allowing them accommodate undesirable lattice within local domain mitigate strain/changes. Compared with conventional approach increasing rigidity structure, our strategy fundamentally address issues, contributing significantly reduced changes, especially along c-direction (by 95.2%). This enables capacity (211.5 mAh g-1 at 0.1 C) long durability cathodes, surpassing commercial products on market. optimization be broadly applied performance issues similarities among layered-structured materials.

Язык: Английский

---

In situ surface modification with solid-state reaction enabling long cycle performance of 4.5 V LiCoO2

Chemical Engineering Journal, Год журнала: 2025, Номер unknown, С. 164038 - 164038

Опубликована: Май 1, 2025

Язык: Английский

---

Stabilizing the cathode-electrolyte interphase for superior Li-ion batteries

Green Chemical Engineering, Год журнала: 2025, Номер unknown

Опубликована: Июнь 1, 2025

Язык: Английский

---

Engineering a superionic conductor surface enables fast Na+ transport kinetics for high-stable layered oxide cathode

Journal of Colloid and Interface Science, Год журнала: 2024, Номер 678, С. 608 - 618

Опубликована: Сен. 16, 2024

Язык: Английский

---

Channelization of cathode/electrolyte interphase to enhance the rate-capability of LiCoO2

Materials Chemistry Frontiers, Год журнала: 2024, Номер unknown

Опубликована: Янв. 1, 2024

The LiCoO 2 @ZrP O 7 cathode was fabricated employing an in situ surface coating technique, which significantly enhanced both the rate capability and structural stability of cathode.

Язык: Английский

---

Wood-Based Materials for High-Energy-Density Lithium Metal Batteries

Nano Energy, Год журнала: 2024, Номер 133, С. 110464 - 110464

Опубликована: Ноя. 10, 2024

Язык: Английский

---

Multifunctional zeolite film enables stable high-voltage operation of LiCoO₂ cathode

Energy & Environmental Science, Год журнала: 2024, Номер unknown

Опубликована: Янв. 1, 2024

This work proposes a multifunctional AlPO 4 -5 zeolite coating with unique porous structure for developing high-voltage LiCoO 2 cathode.

Язык: Английский

---