Anionic Redox in Rechargeable Lithium Batteries

Li, Biao; Xia, Dingguo

doi:10.1002/adma.201701054

Cited by 260 publications

(213 citation statements)

References 194 publications

(277 reference statements)

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“…As shown in the differential capacity plots, the dQ/dV peak at 4.0 V relates to the oxidation of cations Ni 2+ and Co 3+ , and the peak at 4.5 V is attributed to the oxidation of anion O 2− to O 2 2− and releasing of O 2 during the first charge procedure. Then the activated Mn 4+ ion and O 2 2− can be reduced during the subsequent discharging, providing additional capacity compared with traditional Mn‐contained LiMO 2 cathode materials . However, with repeated deeply charging and discharging, the dQ/dV peaks of N‐LLO and P‐LLO shift to the low voltage, which originate from the loss of oxygen, decrease of cation oxidation state, and phase transition according to previous studies, while the smaller primary grains of N‐LLO may lead to the more serious side reaction.…”

Section: Resultsmentioning

confidence: 99%

Reduced Lithium/Nickel Disorder Degree of Sodium‐Doped Lithium‐Rich Layered Oxides for Cathode Materials: Experiments and Calculations

Qin

Pei

et al. 2020

ChemElectroChem

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Sluggish kinetics and poor electrochemical stability limit the implications of Li‐rich layered oxide cathode materials, which are regarded as one of the most promising potential cathode materials for lithium‐ion batteries. In this work, a Na‐doped Li‐rich layered oxide (abbreviated as N‐LLO) cathode material is prepared through co‐precipitation combined with calcination. During the annealing process, partial Li2CO3 is substituted by Na2CO3, which helps to optimize the primary particles and realize Na doping. The obtained N‐LLO cathode exhibits a greater specific capacity and excellent rate performance. The characterization and DFT calculations suggest that the doped Na ions could reduce the formation of Li/Ni disorder defects, change local bond length, and enlarge Li interslab spacing conducive to Li‐ion diffusion, improving the rate performance.

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Section: Resultsmentioning

confidence: 99%

Reduced Lithium/Nickel Disorder Degree of Sodium‐Doped Lithium‐Rich Layered Oxides for Cathode Materials: Experiments and Calculations

Qin

Pei

et al. 2020

ChemElectroChem

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“…As, Ru has similar property as Mn based on the diagonal similarity principle of the periodic table of elements. At the same time, Ru 4+ can be oxidized to higher valence more easily than Mn 4+ . This makes Ru‐based oxide materials as perfect models for mechanism studies of LLOs .…”

Section: Electrochemical Reaction Mechanisms Of Layered–layered Compomentioning

confidence: 99%

“…[38b,43,83-99] Recently, they basically achieved a consensus on the these processes that not only involves transition metal redox, but also involves anionic redox. [84,[88][89][90][91][92][93][94][95][96][97][98][99]…”

Section: Electrochemical Reaction Mechanisms Of Layered-layered Compomentioning

confidence: 99%

Composite‐Structure Material Design for High‐Energy Lithium Storage

Wang

Shi

et al. 2018

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High-energy storage devices are in demand for the rapid development of modern society. Until now, many kinds of energy storage devices, such as lithium-ion batteries (LIBs), sodium-ion batteries (NIBs), and so on, have been developed in the past 30 years. However, most of the commercially exploited and studied active electrode materials of these energy storage devices possess a single phase with low reversible capacity or unsatisfied cycle stability. Continuous and extensive research efforts are made to develop alternative materials with a higher specific energy density and long cycle life by element doping or surface modification. A novel strategy of forming composite-structure electrode materials by introducing structure units has attracted great attention in recent years. Herein, based on previous publications on these composite-structure materials, some important scientific points focusing on the design of composite-structure materials for better electrochemical performances reveal the distinction of composite structures based on average and local structure analysis methods, and an understanding of the relationship between these interior composite structures and their electrochemical performances is discussed thoroughly. The lithiation/delithiation mechanism and the remaining challenges and perspectives for composite-structure electrode materials are also elaborated.

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“…In the past three decades, lithium‐ion batteries (LIBs) have been powering the digital revolution enabled by portable electronics . Nowadays, they are also becoming the main driving force for diverse electrified vehicles.…”

Section: Introductionmentioning

confidence: 99%

Phase Transformation of Lithium‐rich Oxide Cathode in Full Cell and its Suppression by Solid Electrolyte Interphase on Graphite Anode

Wen

et al. 2019

Energy & Environ Materials

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Lithium‐rich oxide is one of the most promising cathodes that meet high energy density requirement for batteries of the future, but its phase transformation from layer to spinel structure caused by the lattice instability presents severe challenge to cycling stability and the actually accessible capacity. The currently available approaches to suppress this undesired irreversible process often resort to limit the high voltages that lithium‐rich oxide is exposed to. However, cycling stability thus improved is at the expense of the eventual energy output. In this work, we identified a new mechanism that is directly responsible for the lithium‐rich oxide phase transformation and established a clear correlation between the successive consumption of Li+ on anode due to incessant interphase repairing and the over‐delithiation of lithium‐rich oxide cathode. This new mechanism enables a simple but effective solution to the cathode degradation, in which an electrolyte additive is used to build a dense and protective interphase on anode with the intention to minimize Li depletion at cathode. The application of this new interphase effectively suppresses both electrolyte decomposition at anode and the phase transformation of lithium‐rich oxide cathode, leading to high capacity and cycling stability.

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Anionic Redox in Rechargeable Lithium Batteries

Cited by 260 publications

References 194 publications

Reduced Lithium/Nickel Disorder Degree of Sodium‐Doped Lithium‐Rich Layered Oxides for Cathode Materials: Experiments and Calculations

Reduced Lithium/Nickel Disorder Degree of Sodium‐Doped Lithium‐Rich Layered Oxides for Cathode Materials: Experiments and Calculations

Composite‐Structure Material Design for High‐Energy Lithium Storage

Phase Transformation of Lithium‐rich Oxide Cathode in Full Cell and its Suppression by Solid Electrolyte Interphase on Graphite Anode

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