Significantly improving cycling performance of cathodes in lithium ion batteries: The effect of Al2O3 and LiAlO2 coatings on LiNi0.6Co0.2Mn0.2O2

Liu, Wen; Li, Xifei; Xiong, Dongbin; Hao, Youchen; Li, Jianwei; Kou, Huari; Yan, Bo; Li, Dejun; Lu, Shigang; Koo, Alicia; Adair, Keegan R.; Sun, Xueliang

doi:10.1016/j.nanoen.2017.11.010

Cited by 567 publications

(313 citation statements)

References 46 publications

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“…[44] Also, the distinct splitting of (018)/ (110) and (006)/(102) indicates the well-defined layered structure. [48] The chemical state of the Mn 2p spectrum (Figure 3g) can be clarified as the combination of Mn 4+ (2p 1/2 654.2 eV, 2p 3/2 642.6 eV) and Mn 3+ (2p 3/2 641.7 eV). This phenomenon is beneficial for enhancing the kinetics as the (110) facet possesses an open layered interspace for the diffusion of Li + while the densely stacking (018) plane has no straight channel for the diffusion of Li + .…”

Section: Structure and Morphologymentioning

confidence: 97%

3D Cube‐Maze‐Like Li‐Rich Layered Cathodes Assembled from 2D Porous Nanosheets for Enhanced Cycle Stability and Rate Capability of Lithium‐Ion Batteries

Liu

Wang

et al. 2019

Advanced Energy Materials

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cathode of LIBs. Recently, Li-rich cathode materials (LMNCO), x Li 2 MnO 3 ·(1 − x) LiTMO 2 (0 < x < 1, TM = Mn, Ni, Co, etc.), have received extensive attentions due to their promising reversible capacity (>250 mAh g −1 ), environmental benignity, and low cost. [3] Nevertheless, the sluggish diffusion of electrons and lithium ions within LMNCO results in electrode polarization and inferior rate capability. [4] It has been verified that the electrochemical performance of LMNCO is closely connected with the morphology and structure, thereby rational design and control of the formation process for LMNCO is considered to be an effective route to enhance the capacity retention and rate capability. [5][6][7][8][9] On the basis of this, extensive efforts have been devoted to develop nanometersized materials and great progresses have been achieved over the past several years, such as construction of nanoplates, [5] nanowires, [10] nanoparticles, [11] and nanorods, [12] which possess a short Li + diffusion pathway thanks to their diminished dimensions. However, severely undesired side reactions between nanoscale electrode/electrolyte are detrimental to structural stability. [13] In order to address these challenges of nanometer-sized materials, hierarchical micro/nano-materials have been developed recently. [14][15][16] Hierarchical LMNCO possessed stable framework of micro-materials can achieve the prolonged cycle life through reducing interfacial reaction with electrolytes. [16] However, individual hierarchical structure strategy may be not enough, as the rate capability and cycling stability of the hierarchical LMNCO still need to be further improved. [17,18] Recent reports have evidenced two-dimensional (2D) nanostructure owns the advantages of open electrons and ions transport path, high active surface area, and excellent structure stability by accommodating the drastic volume evolution, which makes it applicable for ultrahigh-rate and cycling-stable lithium storage. [19][20][21] In addition, 2D nanosheets often have large exposed surface areas and specific facets. [22,23] It has been reported that in LMNCO cathodes, if the surfaces are parallel to {010} facets (e.g., (010), (100), and (110) planes), perpendicular to (001) plane, the Li + diffusion kinetics will be substantially strengthened. [15,16,24,25] Consequently, the synergistic effect of the 2D nanosheets, hierarchical structure, and Li-rich oxide is a promising candidate for the cathodes of next-generation lithium-ion batteries. However, its utilization is restricted by cycling instability and inferior rate capability. To tackle these issues, three-dimensional (3D), hierarchical, cube-maze-like Li-rich cathodes assembled from two-dimensional (2D), thin nanosheets with exposed {010} active planes, are developed by a facile hydrothermal approach. Benefiting from their unique architecture, 3D cube-maze-like cathodes demonstrate a superior reversible capacity (285.3 mAh g −1 at 0.1 C, 133.4 mAh g −1 at 20.0 C) and a great cycle stability (capacity retention of ...

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Section: Structure and Morphologymentioning

confidence: 97%

3D Cube‐Maze‐Like Li‐Rich Layered Cathodes Assembled from 2D Porous Nanosheets for Enhanced Cycle Stability and Rate Capability of Lithium‐Ion Batteries

Liu

Wang

et al. 2019

Advanced Energy Materials

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“…To mitigate these problems, high‐voltage stable molecules such as carbonates are generally introduced 29. Artificial cathode–electrolyte interphases (CEI) produced by coating the active cathode materials with desirable compounds such as organophosphates,30 polypyrrole (PPy),31 phosphate polyanion,32 Al 2 O 3 ,33 and NaTi 2 (PO 4 ) 3 34 have also been reported to protect the cathode. However, the most successful coating strategies are demonstrated in carbonate‐based liquid electrolytes, which introduce new stability challenges when the cathodes are paired with high‐energy alkali metal anodes.…”

Section: Figurementioning

confidence: 99%

Rechargeable Lithium Metal Batteries with an In‐Built Solid‐State Polymer Electrolyte and a High Voltage/Loading Ni‐Rich Layered Cathode

et al. 2020

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Solid‐state batteries enabled by solid‐state polymer electrolytes (SPEs) are under active consideration for their promise as cost‐effective platforms that simultaneously support high‐energy and safe electrochemical energy storage. The limited oxidative stability and poor interfacial charge transport in conventional polymer electrolytes are well known, but difficult challenges must be addressed if high‐voltage intercalating cathodes are to be used in such batteries. Here, ether‐based electrolytes are in situ polymerized by a ring‐opening reaction in the presence of aluminum fluoride (AlF3) to create SPEs inside LiNi0.6Co0.2 Mn0.2O2 (NCM) || Li batteries that are able to overcome both challenges. AlF3 plays a dual role as a Lewis acid catalyst and for the building of fluoridized cathode–electrolyte interphases, protecting both the electrolyte and aluminum current collector from degradation reactions. The solid‐state NCM || Li metal batteries exhibit enhanced specific capacity of 153 mAh g−1 under high areal capacity of 3.0 mAh cm−2. This work offers an important pathway toward solid‐state polymer electrolytes for high‐voltage solid‐state batteries.

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“…Various coating materials have been used, including non‐electrochemically active elements, active electrode materials, phosphate, and carbon . Al, Ti, Zr, and Zn are commonly used non‐electrochemical active elements for cathode coating. After sintering, these elements react to form oxides or lithium metal oxides, which have high chemical stabilities and do not react with the electrolyte .…”

Section: Introductionmentioning

confidence: 99%

Improvement in electronic conductivity of perovskite electrolyte by variable‐valence element doping

et al. 2020

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The perovskite electrolyte Li0.33La0.557TiO3 (LLTO) exhibits high mechanical stability, high ionic conductivity, and low strain during cycling. The cycle stability has been significantly improved using LLTO as a coating material for cathode particles. However, the electronic conductivity of LLTO is very low, which affects electrochemical performances. In this study, variable‐valence elements (Fe, Ni, Co, and Cr) are added to the perovskite to increase the electronic conductivity. The materials are fabricated using a high‐temperature solid‐state reaction method. The phase compositions are characterized by X‐ray diffraction (XRD), while the microstructures are analyzed by scanning electron microscopy. The electronic conductivity of the doped sample is increased by three orders of magnitude, while the ionic conductivity is slightly reduced. The Cr‐doped sample exhibits the highest electronic conductivity of 9.18 × 10−7 S cm−1. The search for mixed conducting perovskites paves the way for the development of efficient coatings for cathode particles.

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Significantly improving cycling performance of cathodes in lithium ion batteries: The effect of Al2O3 and LiAlO2 coatings on LiNi0.6Co0.2Mn0.2O2

Cited by 567 publications

References 46 publications

3D Cube‐Maze‐Like Li‐Rich Layered Cathodes Assembled from 2D Porous Nanosheets for Enhanced Cycle Stability and Rate Capability of Lithium‐Ion Batteries

3D Cube‐Maze‐Like Li‐Rich Layered Cathodes Assembled from 2D Porous Nanosheets for Enhanced Cycle Stability and Rate Capability of Lithium‐Ion Batteries

Rechargeable Lithium Metal Batteries with an In‐Built Solid‐State Polymer Electrolyte and a High Voltage/Loading Ni‐Rich Layered Cathode

Improvement in electronic conductivity of perovskite electrolyte by variable‐valence element doping

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