A Simple Dual-Ion Doping Method for Stabilizing Li-Rich Materials and Suppressing Voltage Decay

Yu, Yang; Yang, Zhe; Zhong, Jianjian; Li, Yanying; Li, Jianling; Wang, Xindong; Kang, Feiyu

doi:10.1021/acsami.0c00944

Cited by 59 publications

(43 citation statements)

References 43 publications

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“…In response, numerous strategies including surface coating, − element doping, − layer-spinel composites, , and so forth. have been adopted to alleviate the continuous capacity and voltage fading.…”

Section: Introductionmentioning

confidence: 99%

Na₂S Treatment and Coherent Interface Modification of the Li-Rich Cathode to Address Capacity and Voltage Decay

Lv²,

Zhang³

et al. 2020

ACS Appl. Mater. Interfaces

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Li-rich and Mn-based layered oxides are the most promising candidates for next-generation high energy density cathode materials. However, inherent problems including poor rate performance, continuous capacity degradation, and voltage fading hinder their commercial utilization. Herein, a lattice-and interfacial-modified Li 1.2 Mn 0.54 Co 0.13 Ni 0.13 O 2 with a pristinelayered bulk structure, Na-and S-doped transition phase, and epitaxially grown Na 2 Mn (SO 4 ) 2 (C2/c symmetry) layer were constructed by Na 2 S treatment. The monoclinic Na 2 Mn(SO 4 ) 2 not only acts as an interface protective layer, alleviating the harmful electrode−electrolyte reactions, but also promotes formation of oxygen vacancy in the layered structure, enhancing reversibility of oxygen redox. The Na and S surface lattice doping leads to enhanced Li + diffusion and alleviates the chance of oxygen release. With the positive effects provided by the stable interfacial layer and lattice modification, the modified cathodes with moderate Na 2 S treatment shows alleviated capacity and voltage decay and enhanced electrochemical kinetics. Especially, the washed cathode with 3 wt % Na 2 S treatment delivers a discharge specific capacity of 305 at 0.1 C and 219 mA h g −1 at 1 C, as well as 93.15% capacity retention and 88.20% voltage retention after 200 cycles at 1 C.

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Section: Introductionmentioning

confidence: 99%

Na₂S Treatment and Coherent Interface Modification of the Li-Rich Cathode to Address Capacity and Voltage Decay

Lv²,

Zhang³

et al. 2020

ACS Appl. Mater. Interfaces

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“…Fort he O1 ss pectra of PLLR, intermediate,and Feox-2 %samples (Figure 3d), the relative intensity of the peak at 531.2 eV increases from 14.6 %t o 20.8 %a fter surface treatment, suggesting the formation of oxygen vacancies. [16] Forall the three samples,the two peaks can be observed in Ni 2p 3/2 with the binding energy of 854.9 eV and 856.5 eV (Figure 3e), which means the existence of Ni 2+ and Ni 3+ ,r espectively. [17] As illustrated in Figure S3, the peak of Fe 2p 3/2 appears around 708.3 eV,7 09.3 eV, 710.4 eV (Fe 2+ )a nd 710.2 eV, 7 11.3 eV,7 12.4 eV,7 13.6 eV (Fe 3+ ), [18] in which the major content is Fe 3+ .T oc onfirm the Mn valence,M n3ss pectra is deconvoluted (Figure 3d).…”

Section: Resultsmentioning

confidence: 86%

A Simple Gas–Solid Treatment for Surface Modification of Li‐Rich Oxides Cathodes

Zhang²,

Chen

et al. 2021

Angewandte Chemie

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Li-richl ayered oxides with high capacity are expected to be the next generation of cathode materials. However,t he irreversible and sluggish anionic redox reaction leads to the O 2 loss in the surface as well as the capacity and voltage fading.I nt he present study,asimple gas-solid treatment with ferrous oxalate has been proposed to uniformly coat at hin spinel phase layer with oxygen vacancy and simultaneously realize Fe-ion substitution in the surface.T he integration of oxygen vacancy and spinel phase suppresses irreversible O 2 release,p revents electrolyte corrosion, and promotes Li-ion diffusion. In addition, the surface doping of Fe-ion can further stabilizet he structure.A ccordingly,t he treated Feox-2 %c athode exhibits superior capacity retention of 86.4 %a nd 85.5 %a t1Ca nd 2C to that (75.3 %a nd 75.0 %) of the pristine sample after 300 cycles,r espectively. Then, the voltage fading is significantly suppressed to 0.0011 V per cycle at 2Cespecially.T he encouraging results may play asignificant role in paving the practical application of Li-rich layered oxides cathode.

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“…Figure 1 shows the processing of high nickel NCM ternary cathode material, which is due to cation mixed discharge caused by structural changes (Wang et al, 2017 ). Many studies believe that heterogeneous ions can be inserted into the lattice through doping, thereby changing the bond energy and lattice parameters and suppressing the deterioration of the internal structure of the lattice (Binder et al, 2018 ; Yu et al, 2020 ).…”

Section: Study On the Surface And Interface Structure Of High-nickel mentioning

confidence: 99%

Research Progress on the Surface of High-Nickel Nickel–Cobalt–Manganese Ternary Cathode Materials: A Mini Review

Song

Xiao

et al. 2020

Front. Chem.

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To address increasingly prominent energy problems, lithium-ion batteries have been widely developed. The high-nickel type nickel-cobalt-manganese (NCM) ternary cathode material has attracted attention because of its high energy density, but it has problems such as cation mixing. To address these issues, it is necessary to start from the surface and interface of the cathode material, explore the mechanism underlying the material's structural change and the occurrence of side reactions, and propose corresponding optimization schemes. This article reviews the defects caused by cation mixing and energy bands in high-nickel NCM ternary cathode materials. This review discusses the reasons why the core-shell structure has become an optimized high-nickel ternary cathode material in recent years and the research progress of core-shell materials. The synthesis method of high-nickel NCM ternary cathode material is summarized. A good theoretical basis for future experimental exploration is provided.

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A Simple Dual-Ion Doping Method for Stabilizing Li-Rich Materials and Suppressing Voltage Decay

Cited by 59 publications

References 43 publications

Na₂S Treatment and Coherent Interface Modification of the Li-Rich Cathode to Address Capacity and Voltage Decay

Na₂S Treatment and Coherent Interface Modification of the Li-Rich Cathode to Address Capacity and Voltage Decay

A Simple Gas–Solid Treatment for Surface Modification of Li‐Rich Oxides Cathodes

Research Progress on the Surface of High-Nickel Nickel–Cobalt–Manganese Ternary Cathode Materials: A Mini Review

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A Simple Dual-Ion Doping Method for Stabilizing Li-Rich Materials and Suppressing Voltage Decay

Cited by 59 publications

References 43 publications

Na2S Treatment and Coherent Interface Modification of the Li-Rich Cathode to Address Capacity and Voltage Decay

Na2S Treatment and Coherent Interface Modification of the Li-Rich Cathode to Address Capacity and Voltage Decay

A Simple Gas–Solid Treatment for Surface Modification of Li‐Rich Oxides Cathodes

Research Progress on the Surface of High-Nickel Nickel–Cobalt–Manganese Ternary Cathode Materials: A Mini Review

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Na₂S Treatment and Coherent Interface Modification of the Li-Rich Cathode to Address Capacity and Voltage Decay

Na₂S Treatment and Coherent Interface Modification of the Li-Rich Cathode to Address Capacity and Voltage Decay