Recent progress in surface coating of cathode materials for lithium ion secondary batteries

Zuo, Daxian; Tian, Guocai; Li, Xiang; Chen, Da; Shu, Kangying

doi:10.1016/j.jallcom.2017.02.230

Cited by 157 publications

(124 citation statements)

References 203 publications

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“…The oxides have high mechanical stabilities, and thus can maintain structural integrity during long‐term operations. The cycling lifetimes of cathode materials have been significantly increased by oxide coatings . However, the ionic and electronic conductivities of the oxides are very low, which reduce the capacity of the cathode.…”

Section: Introductionmentioning

confidence: 99%

“…15 Various methods have been developed to increase the performances of cathode materials, among which surface coating is the most effective method. 16 Various coating materials have been used, including non-electrochemically active elements, 17,18 active electrode materials, 19,20 phosphate, 21 and carbon. 22 Al, 23 Ti, 13 Zr, 24 and Zn 25 are commonly used non-electrochemical active elements for cathode coating.…”

Section: Introductionmentioning

confidence: 99%

“…The cycling lifetimes of cathode materials have been significantly increased by oxide coatings. 16 However, the ionic and electronic conductivities of the oxides are very low, which reduce the capacity of the cathode. Simultaneously, the low conductivity leads to polarization, and thus to the breakage of cathode particles, which hinders the improvement in cycling lifetime.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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“…Lithium‐ion batteries (LIBs) have been widely used in electric vehicles (EVs), hybrid electric vehicles (HEVs) and plug‐in HEVs (PHEVs) ,. Despite the increasing application of the LIBs, there still face severe challenges in the existing battery technology, especially in terms of energy density ,. Cobalt‐free LiNi 0.5 Mn 1.5 O 4 cathode materials constitute attractive choices for the next generation high‐performance cathode materials on account of their high operating voltage (∼4.7 V), low cost, environment‐friendliness and abundance of raw materials ,.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of LiNi_0.5Mn_1.5O₄ via Ammonia‐free Co‐precipitation Method: Insight in the Effects of the Lithium Additions on the Morphology, Structure and Electrochemical properties

Chen

Tang

et al. 2019

ChemistrySelect

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Stoichiometric sphere-like Ni 0.25 Mn 0.75 CO 3 precursors have been synthesized by the ammonia-free co-precipitation via adjusting the Na 2 CO 3 precipitant feeding. As an important factor in LiNi 0.5 Mn 1.5 O 4 synthesis process, the effects of lithium additions on the physicochemical and electrochemical properties of the LiNi 0.5 Mn 1.5 O 4 were extensively investigated. The lithium additions increase can strengthen the LiNi 0.5 Mn 1.5 O 4 crystal growth and crystallization. Lack of lithium additions causes the formation of the lithium deficient compounds, while the excess of lithium additions induces the phase transformation from Fd-3m to P4 3 32 accompanied by the formation of the rock salt phase. The as-prepared spinel LiNi 0.5 Mn 1.5 O 4 with lithium additions of 0.505 delivers 135.8 mAh * g -1 at 147.0 mA * g -1 with capacity retention of 90.06 % after 300 cycles. Even at 2940 mA * g -1 , the discharge capacity can reach to 96.7 mAh * g -1 .These excellent electrochemical performances are mainly ascribed to the Ni 0.25 Mn 0.75 CO 3 precursors with homogenous elements distributions, the good morphology and crystal structure of LiNi 0.5 Mn 1.5 O 4 at appropriate amounts of lithium additions.[a] Dr.

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“…However, there are still many unsolved fundamental challenges in the cathode surface passivation, which impede the efficient protection of cathodes. Especially, the heterogeneous coating‐electrode interfaces bring about significant issues, such as increased internal resistance, lattice strains caused by lattice mismatches at the interfaces, additional charge transfer barrier and capacitive internal electric field, and sluggish Li + diffusion kinetics across the interfaces, which negatively affect LIBs performance. In addition, conventionally used coating techniques in academic research, including atomic layer deposition, chemical vapor deposition, and other physical deposition technologies, cannot be easily integrated with the current LIBs manufacturing …”

mentioning

confidence: 99%

Significantly Improved Cyclability of Conversion‐Type Transition Metal Oxyfluoride Cathodes by Homologous Passivation Layer Reconstruction

Wang

Liang

et al. 2020

Advanced Energy Materials

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Electrode stabilization by surface passivation has been explored as the most crucial step to develop long‐cycle lithium‐ion batteries (LIBs). In this work, functionally graded materials consisting of “conversion‐type” iron‐doped nickel oxyfluoride (NiFeOF) cathode covered with a homologous passivation layer (HPL) are rationally designed for long‐cycle LIBs. The compact and fluorine‐rich HPL plays dual roles in suppressing the volume change of NiFeOF porous cathode and minimizing the dissolution of transition metals during LIBs cycling by forming a structure/composition gradient. The structure and composition of HPL reconstructs during lithiation/delithiation, buffering the volume change and trapping the dissolved transition metals. As a result, a high capacity of 175 mAh g−1 (equal to an outstanding volumetric capacity of 936 Ah L−1) with a greatly reduced capacity decay rate of 0.012% per cycle for 1000 cycles is achieved, which is superior to the NiFeOF porous film without HPL and commercially available NiF2‐FeF3 powders. The proposed chemical and structure reconstruction mechanism of HPL opens a new avenue for the novel materials development for long‐cycle LIBs.

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Recent progress in surface coating of cathode materials for lithium ion secondary batteries

Cited by 157 publications

References 203 publications

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

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

Synthesis of LiNi_0.5Mn_1.5O₄ via Ammonia‐free Co‐precipitation Method: Insight in the Effects of the Lithium Additions on the Morphology, Structure and Electrochemical properties

Significantly Improved Cyclability of Conversion‐Type Transition Metal Oxyfluoride Cathodes by Homologous Passivation Layer Reconstruction

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Recent progress in surface coating of cathode materials for lithium ion secondary batteries

Cited by 157 publications

References 203 publications

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

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

Synthesis of LiNi0.5Mn1.5O4 via Ammonia‐free Co‐precipitation Method: Insight in the Effects of the Lithium Additions on the Morphology, Structure and Electrochemical properties

Significantly Improved Cyclability of Conversion‐Type Transition Metal Oxyfluoride Cathodes by Homologous Passivation Layer Reconstruction

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Synthesis of LiNi_0.5Mn_1.5O₄ via Ammonia‐free Co‐precipitation Method: Insight in the Effects of the Lithium Additions on the Morphology, Structure and Electrochemical properties