Integrated co-modification of PO43− polyanion doping and Li2TiO3 coating for Ni-rich layered LiNi0.6Co0.2Mn0.2O2 cathode material of Lithium-Ion batteries

Yang, Guangchang; Pan, Kai; Lai, Feiyan; Wang, Zhongmin; Chu, Youqi; Yang, Shenglong; Han, Jinlu; Wang, Hongqiang; Li, Qingyu

doi:10.1016/j.cej.2021.129964

Cited by 67 publications

(32 citation statements)

References 68 publications

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“…Also, the linear tail in the low-frequency region is linked to the Warburg impedance (Z w ), which arises from the Li + ion diffusion kinetics inside the NCM particles. 29,30 After 1 cycle (Figure 4D), no obvious difference in the R ct values of both samples (P-NCM: 31.4 Ω, Y-NCM: 21.6 Ω). However, the R ct value of P-NCM remarkably increased from 31.4 to 41.7 Ω after 100 cycles, whereas the R ct value of Y-NCM is relatively slight changes from 21.6 to 24.2 Ω under the same condition, as summarized in Table 2.…”

Section: Resultsmentioning

confidence: 94%

“…The R s values of both samples are identical because the same electrolyte is used. Also, the linear tail in the low‐frequency region is linked to the Warburg impedance (Z w ), which arises from the Li + ion diffusion kinetics inside the NCM particles 29,30 . After 1 cycle (Figure 4D), no obvious difference in the R ct values of both samples (P‐NCM: 31.4 Ω, Y‐NCM: 21.6 Ω).…”

Section: Resultsmentioning

confidence: 98%

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Significant enhancement on electrochemical performance of Ni‐rich LiNi _0.8 Co _0.1 Mn _0.1 O ₂ cathode via YPO ₄ coating

Kang

Hwang

Lee

2022

Intl J of Energy Research

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The YPO 4 -coated LiNi 0.8 Co 0.1 Mn 0.1 O 2 cathode material is successfully fabricated and electrochemical performances are evaluated. The YPO 4 -modified LiNi 0.8 Co 0.1 Mn 0.1 O 2 cathode exhibits an initial discharge capacity of 204.7 mAh g À1 (at 0.1 C) and delivers a discharge capacity of 179.5 mAh g À1 after 100 cycles, which are superior performances than those of pristine LiNi 0.8 Co 0.1 Mn 0.1 O 2 cathode. It is demonstrated that YPO 4 -coated LiNi 0.8-Co 0.1 Mn 0.1 O 2 cathode has a positive effect on electrochemical performances, especially rate capability and cycling stability. Therefore, these results are considered that the YPO 4 coating layer acts as a barrier to keep the LiNi 0.8-Co 0.1 Mn 0.1 O 2 from the physical/chemical attack of electrolyte. K E Y W O R D S cycling stability, electrochemical performances, LiNi 0.8 Co 0.1 Mn 0.1 O 2 cathode, rate capability, YPO 4

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Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 98%

Significant enhancement on electrochemical performance of Ni‐rich LiNi _0.8 Co _0.1 Mn _0.1 O ₂ cathode via YPO ₄ coating

Kang

Hwang

Lee

2022

Intl J of Energy Research

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“…In comparison, an ultrathin nanolayer of ∼2 nm is homogeneously and steadily coated on the surface of LNCAT0.5. The corresponding magnified HR-TEM image in Figure c,d exhibits two sets of lattice fringes, which are (−131) of Li 2 TiO 3 (site III) with an interplanar spacing of 0.250 nm and (111) of TiO 2 (site IV) with an interplanar spacing of 0.219 nm . Meanwhile, the bulk phase (site II) reveals an orderly layered structure, as evidenced by the (003) plane with a lattice distance of 0.472 nm.…”

Section: Resultsmentioning

confidence: 95%

“…In contrast, the initial discharge capacity of the titanium-modified electrodes gradually declined with the increased titanium content. The slightly decreased capacity for LNCAT0.5 and LNCAT1 stems from the inherent electrochemical inertness of titanium and the coating layer, rarely providing Li-storage capacity Figures b and S5 show the rate capacities of LNCAT0, LNCAT0.5, and LNCAT1.…”

Section: Resultsmentioning

confidence: 99%

Dual-Modified Compact Layer and Superficial Ti Doping for Reinforced Structural Integrity and Thermal Stability of Ni-Rich Cathodes

Yang

Bai

Xiang

et al. 2021

ACS Appl. Mater. Interfaces

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Nickel-rich layered oxides have been regarded as a potential cathode material for high-energy-density lithium-ion batteries because of the high specific capacity and low cost. However, the rapid capacity fading due to interfacial side reactions and bulk structural degradation seriously encumbers its commercialization. Herein, a highly stable hybrid surface architecture, which integrates an outer coating layer of TiO2&Li2TiO3 and a surficial titanium doping by incorporated Ti2O3, is carefully designed to enhance the structural stability and eliminate lithium impurity. Meanwhile, the surficial titanium doping induces a nanoscale cation-mixing layer, which suppresses transition-metal-ion migration and ameliorates the reversibility of the H2 → H3 phase transition. Also, the Li2TiO3 coating layer with three-dimensional channels promotes ion transportation. Moreover, the electrochemically stable TiO2 coating layer restrains side reactions and reinforces interfacial stability. With the collaboration of titanium doping and TiO2&Li2TiO3 hybrid coating, the sample with 1 mol % modified achieves a capacity retention of 93.02% after 100 cycles with a voltage decay of only 0.03 V and up to 84.62% at a high voltage of 3.0–4.5 V. Furthermore, the ordered occupation of Ni ions in the Li layer boosts the thermal stability by procrastinating the layered-to-rock salt phase transition. This work provides a straightforward and economical modification strategy for boosting the structural and thermal stability of nickel-rich cathode materials.

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“…It can be seen from the fitted curve of the peak potential change of the oxidation peak that the peak potential of the pure LCO electrode in the first cycle was 4.23 V, which decreased to 4.03 V ( △V = 0.2 V) in the fourth cycle, while the first cycle potential of the LCO/TF-1% electrode was 4.136 V, and the fourth cycle potential was still 4.092 V ( △V = 0.044 V) (Figure f). The offset amplitude of the coated sample was much smaller than that of the pure LCO electrode, which indicated that the coated sample had a more stable voltage platform and less polarization. − …”

Section: Resultsmentioning

confidence: 98%

Simultaneously Constructing a TiO₂–LiF Composite Coating Enhancing the Cycling Stability of LiCoO₂ at 4.6 V High Voltage

Wang

Dai

Chen

et al. 2022

ACS Sustainable Chem. Eng.

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The surface and interface stability of the electrode is an important factor affecting the electrochemical performance of the battery, and surface modification is an effective means to stabilize the electrode surface interface. In this paper, a TiO2–LiF composite coating layer with very stable chemical properties on the LiCoO2 (LCO) surface is prepared in one step. At the same time, surface doping is realized, which provided a stable surface structure for LCO and stabilized the interface between the electrode and electrolyte. Electrochemical test results show that in the range of 3–4.5 V, the capacity retention rate of the sample with a coating amount of 1% is 97.4% after 110 cycles at 0.2 C and a discharge capacity of 151.5 mAh g–1 at 5 C, while the bare electrode is only 67% (110th cycle) and 50.7 mAh g–1 under the same conditions. Even at 0.5 C within 3–4.6 V, the capacity retention rate of the coated sample is still as high as 88.6% after 100 cycles, showing excellent high-voltage cycle stability. Studies such as cyclic voltammetry and electrochemical impedance spectroscopy show that the improvement in electrochemical performance is due to the coating layer effectively stabilizing the LCO surface composition and structure, alleviating the structural degradation of LCO, and optimizing the lithium-ion transport channel.

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Integrated co-modification of PO43− polyanion doping and Li2TiO3 coating for Ni-rich layered LiNi0.6Co0.2Mn0.2O2 cathode material of Lithium-Ion batteries

Cited by 67 publications

References 68 publications

Significant enhancement on electrochemical performance of Ni‐rich LiNi _0.8 Co _0.1 Mn _0.1 O ₂ cathode via YPO ₄ coating

Significant enhancement on electrochemical performance of Ni‐rich LiNi _0.8 Co _0.1 Mn _0.1 O ₂ cathode via YPO ₄ coating

Dual-Modified Compact Layer and Superficial Ti Doping for Reinforced Structural Integrity and Thermal Stability of Ni-Rich Cathodes

Simultaneously Constructing a TiO₂–LiF Composite Coating Enhancing the Cycling Stability of LiCoO₂ at 4.6 V High Voltage

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Integrated co-modification of PO43− polyanion doping and Li2TiO3 coating for Ni-rich layered LiNi0.6Co0.2Mn0.2O2 cathode material of Lithium-Ion batteries

Cited by 67 publications

References 68 publications

Significant enhancement on electrochemical performance of Ni‐rich LiNi 0.8 Co 0.1 Mn 0.1 O 2 cathode via YPO 4 coating

Significant enhancement on electrochemical performance of Ni‐rich LiNi 0.8 Co 0.1 Mn 0.1 O 2 cathode via YPO 4 coating

Dual-Modified Compact Layer and Superficial Ti Doping for Reinforced Structural Integrity and Thermal Stability of Ni-Rich Cathodes

Simultaneously Constructing a TiO2–LiF Composite Coating Enhancing the Cycling Stability of LiCoO2 at 4.6 V High Voltage

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Significant enhancement on electrochemical performance of Ni‐rich LiNi _0.8 Co _0.1 Mn _0.1 O ₂ cathode via YPO ₄ coating

Significant enhancement on electrochemical performance of Ni‐rich LiNi _0.8 Co _0.1 Mn _0.1 O ₂ cathode via YPO ₄ coating

Simultaneously Constructing a TiO₂–LiF Composite Coating Enhancing the Cycling Stability of LiCoO₂ at 4.6 V High Voltage