Enhanced Electrochemical Performance of LiNi0.8Co0.1Mn0.1O2 Cathode with an Ionic Liquid-Based Electrolyte

Ma, Chenchong; Wang, Dong; Yang, Yun; Wu, Qian; Chen, Zheng; Zhu, Caizhen; Gao, Yuan; Li, Cuihua

doi:10.1149/2.1271914jes

Cited by 8 publications

(4 citation statements)

References 40 publications

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“…After activation, the NCG cathode delivers a high CE and is stable during subsequent cycling. A similar change on CE can also be observed in Ni-rich oxide cathode in coin cells and full cells. ,, These improvements indicate the well-maintained structure integrity in NCG, which benefit from the radially aligned microstructure after Ga doping. Furthermore, the capacity fading and structure deterioration of NC and NCG cathodes can be more sensitively analyzed by the charge–discharge midpoint potential evolution during cycling.…”

Section: Resultssupporting

confidence: 64%

Ga-Doped Ultrahigh-Nickel Oxide Microspheres with Radially Aligned Primary Grains as a Cathode for Stable Cycling Li-Ion Batteries

Liu,

Hao,

Gao

2023

ACS Appl. Mater. Interfaces

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Owing to the high energy density, ultrahigh-nickel (Ni > 0.9) layered oxides are used as promising cathode materials for next-generation Li-ion batteries. Unfortunately, the serious pulverization and rapid capacity fading during cycling limit the commercial viability of an ultrahigh-nickel oxide cathode. Herein, the introduction of Ga into LiNi0.96Co0.04O2 brings a radially aligned microstructural change of oxide microspheres during the lithiation of the Ni0.96Co0.04(OH)2 precursor. As expected, such radially aligned needle-like primary grains on microspheres have a positive influence to reduce the anisotropic volume change and suppress the formation of microcracks of Ga-induced Li(Ni0.96Co0.04)0.99Ga0.01O2 during cycling. Specifically, compared with irregular primary grains of LiNi0.96Co0.04O2, Ga-induced oxide presents a high initial discharge capacity of 227.9 mA h g–1 at 0.1C rate between 2.8 and 4.3 V. Especially, Ga-induced oxide delivers higher initial discharge capacities of 233.9 and 240.3 mA h g–1 with higher cutoff charge voltages of 4.4 and 4.5 V at 0.1C, respectively. Furthermore, a good capacity retention of 74.1% at 1 C rate is obtained after 300 cycles, which is almost 85% higher than that of the pristine sample, mainly due to the generation of microcracks of oxide microspheres during the long-term cycle. Therefore, the introduction of Ga into LiNi0.96Co0.04O2 is a feasible approach for improving the microstructure and cycling stability of the ultrahigh-Ni layered oxides.

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Section: Resultssupporting

confidence: 64%

Ga-Doped Ultrahigh-Nickel Oxide Microspheres with Radially Aligned Primary Grains as a Cathode for Stable Cycling Li-Ion Batteries

Liu,

Hao,

Gao

2023

ACS Appl. Mater. Interfaces

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“…[99,100] Furthermore, ILs can be also decomposed on the surface of Li-metal surface to form compact SEI or on the surface of high-voltage cathode to form smooth CEI. [101] Therefore, ILs are deemed as excellent electrolyte composition for various kinds of batteries. However, the high viscosity, the low ionic conductivity and the high cost of ILs impedes their practical application.…”

Section: Ionic-liquid-based Electrolytementioning

confidence: 99%

Advanced Nonflammable Organic Electrolyte Promises Safer Li‐Metal Batteries: From Solvation Structure Perspectives

et al. 2023

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of our daily life from electronic gadgets to electrical vehicles (EVs) and large-scale energy storage. Especially, in recent years, the rapid popularization of EVs has further stimulated the demand of LIBs. [3] Unfortunately, with the increasing demand of LIBs, there are ever-growing concerns on the safety of LIBs given the possibility of thermal runaway of electrode materials in highly flammable and volatile liquid electrolyte. [4] Over the past several decades, several fatal accidents are caused by the spontaneous combustion of LIBs, taking several lives away. For example, in 2010, a UPS Boeing 747 cargo plane caught fire on board and then crashed in Dubai, killing both pilots. Later investigation suggests that the on-board fire was triggered by the spontaneous combustion of LIBs in the cargo hold. [5] As shown in Figure 1, over the past 10 years, with the rapid popularization of EVs, several EVs caught fires either during operation (charge or discharge) or during rest, leading to severe property damages and even casualties. [4] The main cause of these accidents can be classified into three categories: mechanic abuse such as crash or penetration, electrical abuse such as overcharge or external short circuit, and thermal abuse such as overheat. [4] All those abuse conditions result in the thermal runaway, which eventually leads to the smoke, fire, and explosion in the EVs.Compared with LIBs, Li-metal batteries with higher energydensity are far more dangerous. [6,7] Besides the potential Batteries with a Li-metal anode have recently attracted extensive attention from the battery communities owing to their high energy density. However, severe dendrite growth hinders their practical applications. More seriously, when Li dendrites pierce the separators and trigger short circuit in a highly flammable organic electrolyte, the results would be catastrophic. Although the issues of growth of Li dendrites have been almost addressed by various methods, the highly flammable nature of conventional organic liquid electrolytes is still a lingering fear facing high-energy-density Li-metal batteries given the possibility of thermal runaway of the high-voltage cathode. Recently, various kinds of nonflammable liquid-or solid-state electrolytes have shown great potential toward safer Li-metal batteries with minimal detrimental effect on the battery performance or even enhanced electrochemical performance. In this review, recent advances in developing nonflammable electrolyte for high-energy-density Li-metal batteries including high-concentration electrolyte, localized high-concentration electrolyte, fluorinated electrolyte, ionic liquid electrolyte, and polymer electrolyte are summarized. Then, the solvation structure of different kinds of nonflammable liquid and polymer electrolytes are analyzed to provide insight into the mechanism for dendrite suppression and fire extinguishing. Finally, guidelines for future design of nonflammable electrolyte for safer Li-metal batteries are provided.

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“…In the case of cycled 400AS-NCM811, −C–F– peaks of the PVDF binder (291.0 eV, C 1s; 688.68 eV, F 1s) were more intense than those observed for bare NCM811, which was indicative of less pronounced electrolyte decomposition in the former case. − In addition, cycled 400AS-NCM811 exhibited two peaks at 162.3 and 170.2 eV (S 2p) and 400.4 eV (N 1s), corresponding to SO x and −C–N– functional groups originating from AS. The former groups were expected to effectively inhibit electrolyte decomposition on the surface of NCM811, while the latter were expected to hinder Ni dissolution from NCM811 by effectively trapping residual HF. ,, These assumptions were supported by the results of ICP–MS analysis (Figure ): Ni levels of 6517 and 1108 ppm were observed in the cycled electrolyte of cells with bare NCM811 and 400AS-NCM811 cathodes, respectively. Although slightly higher values (1659 and 3120 ppm, respectively) were observed for 500AS- and 600AS-NCM811-based cells, they were still smaller than the value determined for bare NCM811.…”

Section: Results and Discussionmentioning

confidence: 99%

Sulfonate-Based Artificial Cathode–Electrolyte Interface to Enhance Electrochemical Performance of Ni-Rich Layered Oxide Cathode Materials

Song

Jang

Choi

et al. 2020

ACS Sustainable Chem. Eng.

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Despite significant progress in the field of Li-ion battery development over the past 30 years, challenges associated with the gradual shift from small-scale to large-scale battery applications necessitate the search for better electrode materials. In particular, Ni-rich layered oxide cathode materials (NCM) feature high specific capacities but suffer from inferior high-temperature cycling performance because of poor surface stability. Herein, we use ammonium sulfate (AS) to form a bifunctionalized cathode–electrolyte interface and thus improve NCM surface stability, revealing that thermal treatment of NCM in the presence of AS affords an artificial cathode–electrolyte interface comprising sulfonate and amino functional groups and thus effectively hinders electrolyte decomposition and Ni dissolution. The modified NCM feature surfaces with well-developed artificial cathode–electrolyte interfaces (which do not compromise structural stability) exhibit good high-temperature cycling performance. The modified NCM at 400 °C features a capacity retention of 75.6% after 100 cycles at 45 °C, whereas a much lower value of 52.2% is observed for the bare counterpart under identical conditions. Cycling-induced electrolyte decomposition, cracking, and Ni dissolution are strongly suppressed in cells with surface-modified NCM, which implies that residual hydrogen fluoride removal by the bifunctionalized artificial cathode–electrolyte interface improves NCM surface stability. Thus, the use of a bifunctionalized artificial cathode–electrolyte interface modified by task-specific AS is concluded to improve the surface properties of NCM and their high-temperature electrochemical performance.

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Enhanced Electrochemical Performance of LiNi_0.8Co_0.1Mn_0.1O₂ Cathode with an Ionic Liquid-Based Electrolyte

Cited by 8 publications

References 40 publications

Ga-Doped Ultrahigh-Nickel Oxide Microspheres with Radially Aligned Primary Grains as a Cathode for Stable Cycling Li-Ion Batteries

Ga-Doped Ultrahigh-Nickel Oxide Microspheres with Radially Aligned Primary Grains as a Cathode for Stable Cycling Li-Ion Batteries

Advanced Nonflammable Organic Electrolyte Promises Safer Li‐Metal Batteries: From Solvation Structure Perspectives

Sulfonate-Based Artificial Cathode–Electrolyte Interface to Enhance Electrochemical Performance of Ni-Rich Layered Oxide Cathode Materials

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