Building Practical High‐Voltage Cathode Materials for Lithium‐Ion Batteries (Adv. Mater. 52/2022)

Xiang, Jingwei; Wei, Ying; Zhong, Yun; Yang, Yan; Cheng, Hang; Yuan, Lixia; Xu, Henghui; Huang, Yunhui

doi:10.1002/adma.202270362

Cited by 16 publications

(23 citation statements)

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“…The rapid development of lithium‐ion battery (LIB) industry has stimulated the demand of high‐energy‐density cathode materials for next generation LIBs. [ 1 ] Among the cathode materials, Li‐rich Mn‐based layered oxide cathode materials (LRLOs, with formula of xLiMO 2 ·(1‐x)Li 2 MnO 3 or Li 1+x M 1‐x O 2 , M = Mn, Ni, Co, 0 < x < 1) with reversible specific capacities over 250 mAh g −1 have attracted increasing attentions due to the redox chemistry of both transition metal (TM) cations and oxygen anions. [ 2 ] The structure of LRLOs is considered to be composed of solid solution or two phases of LiMO 2 ( R‐3m space group) and Li 2 MnO 3 ( C2/m space group), which remains controversial.…”

Section: Introductionmentioning

confidence: 99%

Regulating the Unhybridized O 2p Orbitals of High‐Performance Li‐Rich Mn‐Based Layered Oxide Cathode by Gd‐Doping Induced Bulk Oxygen Vacancies

Wan

Zhang

et al. 2023

Adv Funct Materials

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Li-rich Mn-based layered oxides (LRLOs) with ultrahigh specific capacities are promising cathode materials for high energy density lithium-ion batteries. Nevertheless, severe irreversible oxygen release, structure degradation, capacity and voltage attenuation hinder their commercialization due to the uncontrollable oxygen redox chemistry originated from unhybridized O 2p orbitals. Herein, a strategy to generate bulk oxygen vacancies is proposed. And bulk oxygen vacancies are constructed by lowering the formation energy of oxygen vacancies in LRLOs via Gd-doping. The energy level and the amount of unhybridized O 2p states are reduced to partly inhibit the oxygen redox activity. Surprisingly, the oxygen redox is not fully activated in the first cycle and is further activated in the second cycle. Moreover, the reduced oxygen redox activity significantly suppresses the oxygen release, lattice volume change, layered-to-spinel phase transition. As a result, the amount of oxygen gas release is reduced from 98.80 to ≈0 nmol mg −1 in the first cycle. Superior cycle stability of 90.4% capacity retention after 300 cycles and small voltage decay of only 1.013 mV per cycle are achieved. This study provides a valuable bulk oxygen vacancies strategy to regulate the unhybridized O 2p orbitals for designing high-performance Li-rich Mn-based layered oxide cathode materials.

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Section: Introductionmentioning

confidence: 99%

Regulating the Unhybridized O 2p Orbitals of High‐Performance Li‐Rich Mn‐Based Layered Oxide Cathode by Gd‐Doping Induced Bulk Oxygen Vacancies

Wan

Zhang

et al. 2023

Adv Funct Materials

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“…Promoted by advanced battery engineering, conventional lithium‐ion batteries (LIBs) are approaching their ceiling of energy density (≈350 Wh kg −1 ). [ 1,2 ] Lithium–sulfur (Li–S) batteries, with a theoretical energy density of 2500 Wh kg −1 , are one of the most competitive candidates for the pathway to 500 Wh kg −1 batteries. [ 3–6 ] Safety is a red line for large‐scale applications to any batteries.…”

Section: Introductionmentioning

confidence: 99%

Integrating an In‐Plane Electron‐Conductive Separator to Enable Short‐Circuit Warning in Lithium–Sulfur Batteries

Wang

Yan

et al. 2023

Advanced Sustainable Systems

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Lithium–sulfur (Li–S) batteries are one of the most competitive candidates for high‐energy‐density batteries. However, the high energy density and high reactivity of the lithium anode and sulfur cathode make the safety issues of Li–S batteries particularly prominent. Herein, an early warning strategy for the short circuits in Li–S batteries is explored by integrating an in‐plane electron‐conductive separator. The internal short circuits caused by lithium dendrites or manufacturing defects can be quickly and accurately predicted before catastrophic thermal runaway, with enough time to take rescue measures. The separator with high thermal conductivity also facilitates the heat dissipation of the cell, thus reducing the risk of thermal runaway under abuse. The fast and reliable early warning strategy based on the in‐plane electron‐conductive separator builds the Great Wall of active defense against inherently unsafe Li–S batteries.

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“…To date, several approaches have been used to improve the electrochemical stability of high voltage cathode materials including surface modifications [2,14–16] and metal doping [17–20] . However, the modification of electrode materials involves higher cost and complicated processes to be implemented in the industrial scale.…”

Section: Introductionmentioning

confidence: 99%

Revealing the Influence of Electrolyte Additives in Reducing the Heat Generation of High Voltage Lithium‐Ion Batteries using Operando Accelerating Rate Calorimetry (ARC)

Baazizi,

Sayah,

Karbak

et al. 2023

Batteries & Supercaps

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Lithium‐ion batteries operating at high voltage generally endure drastic capacity fading and serious safety issues. Working on the electrolytes’ stability can be a solution to mitigate these problems related to high voltage. Herein, the beneficial impact of functional electrolyte additives in a state‐of‐the‐art carbonate‐based electrolyte is demonstrated. The combination of fluoroethylene carbonate (FEC) with succinonitrile (SN) as additives was used to enhance the thermal stability of the electrolyte reference 1 M LiPF6 in EC:DMC (1 : 1, by weight) and cycling stability of a high voltage lithium‐ion device, consisting of a LiMn1.5Ni0.5O4 cathode and a metallic lithium anode. The electrolyte using the FEC/SN mixture displayed a wider electrochemical stability window (ESW) exhibited by linear sweep voltammetry (LSV). Furthermore, this electrolyte allowed the device to exhibit better rate capability and a capacity retention of 75 % after 100 cycles. Interestingly, the FEC+SN‐based electrolyte exhibited better thermal stability using operando accelerating rate calorimetry (ARC) by virtue of the lower heat quantity generated by the battery device. The remarkable improvements can be ascribed to the formation of a protective cathode‐electrolyte interface (CEI) produced by interfacial reactions between the cathode surface and electrolyte compounds.

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Building Practical High‐Voltage Cathode Materials for Lithium‐Ion Batteries (Adv. Mater. 52/2022)

Cited by 16 publications

References 0 publications

Regulating the Unhybridized O 2p Orbitals of High‐Performance Li‐Rich Mn‐Based Layered Oxide Cathode by Gd‐Doping Induced Bulk Oxygen Vacancies

Regulating the Unhybridized O 2p Orbitals of High‐Performance Li‐Rich Mn‐Based Layered Oxide Cathode by Gd‐Doping Induced Bulk Oxygen Vacancies

Integrating an In‐Plane Electron‐Conductive Separator to Enable Short‐Circuit Warning in Lithium–Sulfur Batteries

Revealing the Influence of Electrolyte Additives in Reducing the Heat Generation of High Voltage Lithium‐Ion Batteries using Operando Accelerating Rate Calorimetry (ARC)

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