Mechanism of Doping with High‐Valence Elements for Developing Ni‐Rich Cathode Materials

Advanced Energy Materials, Год журнала: 2023, Номер 13(34)

Опубликована: Июль 16, 2023

Abstract Introducing additional elements into Ni‐rich cathodes is an essential strategy for addressing the instability of cathode material. Conventionally, this doping considers only incorporation bulk structure in terms fortifying crystal structure. However, high‐valence such as Nb 5+ , Ta and Mo 6+ are likely to be insoluble structure, resulting accumulation along interparticle boundaries. Herein, a new mechanism their effects on morphology investigated by calcining LiNiO 2 (LNO) X‐doped LNO (X = Al, Nb, Ta, Mo) at various temperatures. Operando X‐ray diffraction analysis reveals that temperature which content Li‐X‐O compounds declines higher dopants with high oxidation states, reinforcing segregation grain boundary widening calcination range. Thus, highly aligned microstructure crystallinity maintained over wide range after elements, enhancing electrochemical performance. As next‐generation dopants, can fortify not but also microstructure, maximize performance cathodes.

Язык: Английский

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High-entropy doping promising ultrahigh-Ni Co-free single-crystalline cathode toward commercializable high-energy lithium-ion batteries

Science Advances, Год журнала: 2024, Номер 10(25)

Опубликована: Июнь 21, 2024

The development of advanced layered Ni-rich cathodes is essential for high-energy lithium-ion batteries (LIBs). However, the prevalent are still plagued by inherent issues chemomechanical and thermal instabilities limited cycle life. For this, here, we introduce an efficient approach combining single-crystalline (SC) design with in situ high-entropy (HE) doping to engineer ultrahigh-Ni cobalt-free cathode LiNi

Язык: Английский

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Microstructures of layered Ni-rich cathodes for lithium-ion batteries

Chemical Society Reviews, Год журнала: 2024, Номер 53(9), С. 4707 - 4740

Опубликована: Янв. 1, 2024

The microstructural degradation, stabilization, and characterization of layered Ni-rich cathodes for Li-ion batteries are comprehensively reviewed in this paper.

Язык: Английский

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Doping Strategy in Developing Ni-Rich Cathodes for High-Performance Lithium-Ion Batteries

ACS Energy Letters, Год журнала: 2024, Номер 9(2), С. 740 - 747

Опубликована: Янв. 31, 2024

Doping is indispensable for ensuring the long-term cycling stability of Ni-rich layered cathodes. However, using a single type dopant limits development stable, high-energy cathode material in shot. In this study, dual doping strategy Al3+ and Nb5+ ions was adopted to improve Li[Ni0.92Co0.04Mn0.04]O2 (NCM92) cathode; fortifies crystal structure, while optimized morphology primary particles. The not only combines benefits both dopants simultaneously but also demonstrates excellent performance enhancement through synergistic effects. Li[Ni0.905Co0.04Mn0.04Al0.005Nb0.01]O2 (AlNb-NCM92) cathode, which developed Al Nb, exhibited remarkable stability, retaining 88.3% its initial capacity even after 1000 cycles. This result suggests that needs comprehensively consider structure microstructure maximize materials.

Язык: Английский

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Ni-rich cathode materials for stable high-energy lithium-ion batteries

Nano Energy, Год журнала: 2024, Номер 126, С. 109620 - 109620

Опубликована: Апрель 18, 2024

The evolution of modern society demands sustainable rechargeable lithium-ion batteries (LIBs) with higher capacity and improved safety standards. High voltage Ni-rich layered transition metal oxides (i.e., LiNi1-x-yCoxMnyO2, NCM) have emerged as one the most promising cathode materials in meeting this demand. However, instability NCMs cathodes presents challenges large-scale commercialization. This review examines energy storage mechanism, e.g., possible (electro)chemical reactions, occurring at bulk surface degradation mechanism materials. To address challenging issue, we highlight recent advances strategies for engineering NCMs, including lattice, composition, microstructure engineering, electrolyte interfacial engineering. By addressing mechanisms improving overall stability, work sheds lights on potential avenues commercialization cathode-based high-performance LIBs.

Язык: Английский

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Kirkendall effect-induced uniform stress distribution stabilizes nickel-rich layered oxide cathodes

Nature Communications, Год журнала: 2024, Номер 15(1)

Опубликована: Фев. 19, 2024

Abstract Nickel-rich layered oxide cathodes promise ultrahigh energy density but is plagued by the mechanical failure of secondary particle upon (de)lithiation. Existing approaches for alleviating structural degradation could retard pulverization, yet fail to tune stress distribution and root out formation cracks. Herein, we report a unique strategy uniformize in via Kirkendall effect stabilize core region during electrochemical cycling. Exotic metal/metalloid oxides (such as Al 2 O 3 or SiO ) introduced heterogeneous nucleation seeds preferential growth precursor. The calcination treatment afterwards generates dopant-rich interior structure with central void, due different diffusivity between exotic element nickel atom. resulting cathode material exhibits superior reversibility, thus contributing high specific (based on cathode) 660 Wh kg −1 after 500 cycles retention rate 86%. This study suggests that uniformizing represents promising pathway tackle instability facing nickel-rich cathodes.

Язык: Английский

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Insights into Cation Migration and Intermixing in Advanced Cathode Materials for Lithium‐Ion Batteries

Advanced Energy Materials, Год журнала: 2024, Номер unknown

Опубликована: Июнь 29, 2024

Abstract Cathode materials are the core components of lithium‐ion batteries owing to determination practical voltage and effective energy battery system. However, advanced cathodes have faced challenges related cation migration intermixing. In this review, study summarizes structural failure mechanisms due mixing cathodes, including Ni‐rich Li‐rich layered spinel, olivine, disordered rock‐salt materials. This review starts by discussing degradation caused intermixing in different focusing on electronic structure, crystal electrode structure. Furthermore, optimization strategies for inhibition rational utilization systematically encapsulated. Last but not least, remaining proposed perspectives highlighted future development cathodes. The accurate analysis using characterization, precise control material synthesis, multi‐dimensional synergistic modification will be key research areas provides a comprehensive understanding emerge as pivotal controllable factors further

Язык: Английский

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Mechanism Behind the Loss of Fast Charging Capability in Nickel‐Rich Cathode Materials

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(12)

Опубликована: Янв. 31, 2024

Fast charging technology for electric vehicles (EVs), offering rapid times similar to conventional vehicle refueling, holds promise but faces obstacles owing kinetic issues within lithium-ion batteries (LIBs). Specifically, the significance of cathode materials in fast has grown because Ni-rich cathodes are employed enhance energy density LIBs. Herein, mechanism behind loss capability during extended cycling is investigated through a comparative analysis with different microstructures. The results revealed that microcracks and resultant deterioration significantly compromised over cycling. When thick rocksalt impurity phases form throughout particles electrolyte infiltration via microcracks, limited kinetics Li

Язык: Английский

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Revealing proton-coupled exchange mechanism in aqueous ion-exchange synthesis of nickel-rich layered cathodes for lithium-ion batteries

eScience, Год журнала: 2024, Номер 4(4), С. 100229 - 100229

Опубликована: Янв. 6, 2024

Ion exchange is a promising synthetic method for alleviating severe cation mixing in traditional layered oxide materials lithium-ion batteries, leading to enhanced structural stability. However, the underlying mechanisms of ion are still not fully understood. Such fundamental study ion-exchange mechanism needed achieving controllable synthesis oxides with stable structure. Herein, we thoroughly unearth that triggers Ni-rich aqueous solutions by examining time-resolved evolution combined theoretical calculations. Our results reveal reaction pathway can be divided into two steps: protonation and lithiation. The proton key charge balance process, as revealed X-ray adsorption spectroscopy inductive coupled plasma analysis. In addition, intermediate product shows high lattice distortion during exchange, but it ends up most energy. apparent discrepancies energy between before after emphasize importance design This work provides new insights materials, which advances development cathode high-performance batteries.

Язык: Английский

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Structure and Charge Regulation Strategy Enabling Superior Cycling Stability of Ni-Rich Cathode Materials

ACS Applied Materials & Interfaces, Год журнала: 2024, Номер 16(9), С. 11377 - 11388

Опубликована: Фев. 22, 2024

Ni-rich layered oxides LiNixCoyMn1–x–yO2 (NCMs, x > 0.8) are the most promising cathode candidates for Li-ion batteries because of their superior specific capacity and cost affordability. Unfortunately, NCMs suffer from a series formidable challenges such as structural instability incompatibility with commonly used electrolytes, which seriously hamper practical applications on large scale. Herein, Al/Ta codoping modification strategy is proposed to improve performance LiNi0.83Co0.1Mn0.07O2 cathode, as-prepared Al/Ta-modified delivers exceptional cycling stability retention 97.4% after 150 cycles at 1C an excellent rate high 143.2 mAh g–1 even 3C. Based experimental study, it found that NCM strengthened due regulated coordination oxygen by introducing robust Ta–O covalent bond, prevents structure collapsing. Moreover, reconstructed rock-salt-like surface capable effectively inhibiting interfacial side reactions well overgrowth cathode–electrolyte interface. Theoretically, energy Li/Ni mixing significantly increased introduction Al Ta elements in codoped NCM, leading inhibited adverse phase transition during cycling. A feasible pathway designing developing advanced materials provided this work.

Язык: Английский

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