Composite Nanostructure Construction on the Grain Surface of Li‐Rich Layered Oxides

Wang, Errui; Zhao, Yang; Xiao, Dongdong; Zhang, Xu; Wu, Tianhao; Wang, Boya; Zubair, Muhammad; Li, Yuqiang; Sun, Xueliang; Yu, Haijun

doi:10.1002/adma.201906070

Cited by 79 publications

(58 citation statements)

References 56 publications

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“…[ 10,11 ] Recently, a composite nanostructures comprising of uniform LiTaO 3 coating layer (≈3 nm) and spinel interlayer (≈1 nm) was constructed on the grain surface of industrial LLO (Li 1.13 Mn 0.517 Ni 0.256 Co 0.097 O 2 ) agglomerated spheres in our group, further reducing the voltage decay rate into the value of 0.9 mV per cycle. [ 12 ] Although surface modification can enhance the structural/interfacial stability of LLOs, these approaches can hardly adjust the properties of LLOs through intrinsic characteristics, and thus leave ample room for further optimization. The less explored approach is the tailoring of intrinsic LLOs to provide new routes to eliminate their drawbacks.…”

Section: Figurementioning

confidence: 99%

“…This study is based on our previous 10 year systematic investigation into the pristine crystal structure, crystal structure evolution during electrochemical cycling, crystal structure design, and thermodynamic/kinetic reaction mechanisms of LLOs. [ 7,12,19–22 ] Therefore, the full concentration gradient agglomerated‐sphere LLO with linearly decreasing Mn and linearly increasing Ni and Co from the center to the surface has been designed for further solving the severe voltage decay problem. The concentration gradient can be precisely tailored on the basis of a bulk‐structure design strategy.…”

Section: Figurementioning

confidence: 99%

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Full Concentration Gradient‐Tailored Li‐Rich Layered Oxides for High‐Energy Lithium‐Ion Batteries

Liu

Zhang

et al. 2020

Advanced Materials

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Lithium‐rich layered oxides (LLOs) are prospective cathode materials for next‐generation lithium‐ion batteries (LIBs), but severe voltage decay and energy attenuation with cycling still hinder their practical applications. Herein, a series of full concentration gradient‐tailored agglomerated‐sphere LLOs are designed with linearly decreasing Mn and linearly increasing Ni and Co from the particle center to the surface. The gradient‐tailored LLOs exhibit noticeably reduced voltage decay, enhanced rate performance, improved cycle stability, and thermal stability. Without any material modifications or electrolyte optimizations, the gradient‐tailored LLO with medium‐slope shows the best electrochemical performance, with a very low average voltage decay of 0.8 mV per cycle as well as a capacity retention of 88.4% within 200 cycles at 200 mA g−1. These excellent findings are due to spinel structure suppression, electrochemical stress optimization, and Jahn‐Teller effect inhibition. Further investigation shows that the gradient‐tailored LLO reduces the thermal release percentage by as much as about 41% when the battery is charged to 4.4 V. This study provides an effective method to suppress the voltage decay of LLOs for further practical utilization in LIBs and also puts forward a bulk‐structure design strategy to prepare better electrode materials for different rechargeable batteries.

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Section: Figurementioning

confidence: 99%

Section: Figurementioning

confidence: 99%

Full Concentration Gradient‐Tailored Li‐Rich Layered Oxides for High‐Energy Lithium‐Ion Batteries

Liu

Zhang

et al. 2020

Advanced Materials

Self Cite

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“…However, the development of cathode materials is far below the market expectations, and it is increasingly unable to meet the energy storage demands [6][7][8]. Due to its high theoretical specific capacity (generally over 300 mAh g −1 ), environmental friendly, low cost and other advantages, the Li-and Mn-rich cathodes (LMR) with the chemical formula of Li 1+x (Ni, Mn, Co) 1−x O 2 have received a lot of attention, and been regarded as one of the most promising cathode material for future LIBs [9][10][11][12]. However, LMR cathodes suffer from severe capacity/voltage fading, poor rate capability, and low initial Coulombic efficiency [1].…”

Section: Introductionmentioning

confidence: 99%

Boosting the Electrochemical Performance of Li- and Mn-Rich Cathodes by a Three-in-One Strategy

Lin

et al. 2021

Nano-Micro Lett.

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There are plenty of issues need to be solved before the practical application of Li- and Mn-rich cathodes, including the detrimental voltage decay and mediocre rate capability, etc. Element doping can effectively solve the above problems, but cause the loss of capacity. The introduction of appropriate defects can compensate the capacity loss; however, it will lead to structural mismatch and stress accumulation. Herein, a three-in-one method that combines cation–polyanion co-doping, defect construction, and stress engineering is proposed. The co-doped Na+/SO42− can stabilize the layer framework and enhance the capacity and voltage stability. The induced defects would activate more reaction sites and promote the electrochemical performance. Meanwhile, the unique alternately distributed defect bands and crystal bands structure can alleviate the stress accumulation caused by changes of cell parameters upon cycling. Consequently, the modified sample retains a capacity of 273 mAh g−1 with a high-capacity retention of 94.1% after 100 cycles at 0.2 C, and 152 mAh g−1 after 1000 cycles at 2 C, the corresponding voltage attenuation is less than 0.907 mV per cycle.

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“…Kaewmala et al [149] studied the influence of current density on the structural changes and cycle stability of an LRMO and found that the activation of the Li 2 MnO 3 components was affected by the current density. High-current cycling can effectively reduce the activation of Li 2 MnO 3 and the formation of the spinel phase to obtain better cycling performance and faster Li + diffusion.…”

Section: Regulating Activationmentioning

confidence: 99%

Multi-dimensional correlation of layered Li-rich Mn-based cathode materials

Yang¹,

Zheng²,

Wei³

et al. 2022

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Lithium-rich manganese-based cathode materials are expected to promote the commercialization of lithium-ion batteries to a new stage by virtue of their ultrahigh specific capacity and energy density advantages. However, they are still restricted by complex phase transitions and electrochemical performance degradation caused by labile anion charge compensation. A deep understanding of the electrochemical properties contained in their intrinsic structures and the key driving factors of structural deterioration during cycling are crucial to guide the preparation and optimization of lithium-rich materials. Considering recent progress, this review introduces the intrinsic properties of Li-rich manganese-based cathode materials from interatomic interactions to particle morphology at multiple scales in the spatial dimension. The charge compensation mechanism and energy band reorganization of the initial charge and discharge, the structural evolution during cycling and the electrochemical reaction kinetics of the materials are analyzed in the temporal dimension. Based on the relationship between structure and electrochemical performance, preparation methods and modification methods are introduced to guide and design cathode materials. Effective characterization methods for studying anion charge compensation behavior are also demonstrated. This review provides important guidance and suggestions for making full use of the high specific capacity in these materials derived from anion redox and the maintaining of its stability.

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Composite Nanostructure Construction on the Grain Surface of Li‐Rich Layered Oxides

Abstract: The strong market incentives and pressing environmental preservation call for high-energy, eco-friendly, and highsafety batteries. Lithium-ion batteries (LIBs) are still the most

Cited by 79 publications

References 56 publications

Full Concentration Gradient‐Tailored Li‐Rich Layered Oxides for High‐Energy Lithium‐Ion Batteries

Full Concentration Gradient‐Tailored Li‐Rich Layered Oxides for High‐Energy Lithium‐Ion Batteries

Boosting the Electrochemical Performance of Li- and Mn-Rich Cathodes by a Three-in-One Strategy

Multi-dimensional correlation of layered Li-rich Mn-based cathode materials

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