Dual-site lattice co-doping strategy regulated crystal-structure and microstructure for enhanced cycling stability of Co-free Ni-rich layered cathode

Liu, Lei; Zhao, Yan; Jiang, Guanghui; Liang, Shuquan; Zhang, Yang; Ma, Yaoqiang; Zhang, Yingjie; Meng, Qi; Dong, Peng

doi:10.1007/s12274-023-5479-3

Cited by 20 publications

(4 citation statements)

References 48 publications

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“…X-ray diffraction (XRD) analysis and Rietveld refinements were conducted to characterize the crystal structures of samples. The XRD results demonstrate that all diffraction peaks belong to the hexagonal α-NaFeO 2 -type structure with the R 3̅ m space group without an impure phase . Both P-NCM and AT-NCM display a distinct splitting of peaks assigned to (006)/(012) and (018)/(110), which represent a well-ordered layered structure (Figure S1a,b).…”

Section: Resultsmentioning

confidence: 95%

“…The XRD results demonstrate that all diffraction peaks belong to the hexagonal α-NaFeO 2 -type structure with the R3̅ m space group without an impure phase. 24 Both P-NCM and AT-NCM display a distinct splitting of peaks assigned to (006)/(012) and (018)/(110), which represent a well-ordered S1). This can be attributed to the introduction of Ta 5+ with a larger radius of 0.7 Å in comparison with Ni 3+ /Co 3+ /Mn 4+ (0.56 Å/0.55 Å/0.53 Å), which leads to lattice expansion.…”

Section: Resultsmentioning

confidence: 96%

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Structure and Charge Regulation Strategy Enabling Superior Cycling Stability of Ni-Rich Cathode Materials

Zeng,

Fan,

Zheng

et al. 2024

ACS Appl. Mater. Interfaces

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Ni-rich layered oxides LiNi x Co y Mn 1−x−y O 2 (NCMs, x > 0.8) are the most promising cathode candidates for Li-ion batteries because of their superior specific capacity and cost affordability. Unfortunately, NCMs suffer from a series of formidable challenges such as structural instability and incompatibility with commonly used electrolytes, which seriously hamper their practical applications on a large scale. Herein, the Al/Ta codoping modification strategy is proposed to improve the performance of the LiNi 0.83 Co 0.1 Mn 0.07 O 2 cathode, and the asprepared Al/Ta-modified LiNi 0.83 Co 0.1 Mn 0.07 O 2 delivers exceptional cycling stability with a capacity retention of 97.4% after 150 cycles at 1C and an excellent rate performance with a high capacity of 143.2 mAh g −1 even at 3C. Based on the experimental study, it is found that the structural stability of NCM is strengthened due to the regulated coordination of oxygen by introducing a robust Ta−O covalent bond, which prevents the layered structure from collapsing. Moreover, the reconstructed rock-salt-like surface is capable of effectively inhibiting interfacial side reactions as well as the overgrowth of the cathode−electrolyte interface. Theoretically, the energy of Li/Ni mixing is significantly increased with the introduction of Al and Ta elements in Al/Ta codoped NCM, leading to inhibited adverse phase transition during cycling. A feasible pathway for designing and developing advanced Ni-rich cathode materials for Li-ion batteries is provided in this work.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 96%

Structure and Charge Regulation Strategy Enabling Superior Cycling Stability of Ni-Rich Cathode Materials

Zeng,

Fan,

Zheng

et al. 2024

ACS Appl. Mater. Interfaces

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“…71 To display better performance, multielement co-doping is conducted by utilizing the synergistic effects of different ions such as Al 3+ and Nb 5+ , 72 and Mg and W co-doping. 73 Li et al reported Al and Sm co-doped single-crystal LiNi 0.83 Co 0.07 Mn 0.10 O 2 material to improve Li + diffusion and structure stability (Fig. 3b).…”

Section: Application Of Nickel In Power Lithium-ion Batteriesmentioning

confidence: 99%

The future nickel metal supply for lithium-ion batteries

Sun,

Zhou,

Huang

2024

Green Chem.

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“…15,16 Liu et al adopt a Mg/W co-doping strategy for LiNi 0.9 Al 0.1 O 2 cathodes to improve the durability of cycling through crystal structure modification and the creation of a microstructure aligned radially from the center. 17 doped LiNi 0.8 Co 0.1 Mn 0.1 O 2 cathode material through the sol− gel method, achieving improved structural stability and reduced particle agglomeration. 19 While co-doping can effectively improve the structural stability and electrochemical performance of Ni-rich cathode materials, the addition of inactive dopants may result in a decrease in reversible electrochemical capacity.…”

Section: Introductionmentioning

confidence: 99%

Revealing the Impact of Dual Site Modification on the Phase Transformation and Ion Transport Mechanism of Ni-Rich Cathode Materials

Zhang,

Cao,

Lin

et al. 2024

ACS Appl. Mater. Interfaces

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Ni-rich cathode materials have garnered significant attention attributable to the high reversible capacity and superior rate performance, particularly in the electric vehicle industry. However, the structural degradation experienced during cycling results in rapid capacity decay and deterioration of the rate performance, thereby impeding the widespread application of Ni-rich cathodes. Herein, a Mg/Ti co-doping strategy was developed to boost the structure stability and Li-ion transport kinetics of the Ni-rich cathode material LiNi 0.90 Co 0.05 Mn 0.05 O 2 (NCM9055) under long cycle. It is demonstrated that the Mg 2+ ions inserted into the lithium layer could serve as pillars, enhancing the stability of the delithiated layer structure. The introduction of robust Ti−O bonding mitigated the detrimental H2−H3 phase transition (∼4.2 V) during cycling. In addition, despite the fact that Mg/Ti co-doping slightly reduces Li + diffusion coefficient in the modified cathode material (NCM9055-MT), it effectively stabilized the robustness of the layered structure and maintained the Li + diffusion channel while charging and discharging, thereby improving the Li + diffusion coefficient after a long cycle. Therefore, the Mg/Ti co-doped cathode materials exhibited an exceptional capacity retention rate of 99.9% (100 cycles, 1 C). Additionally, the Li + diffusion coefficient of the co-doped NCM9055-MT (2.924 × 10 −10 cm 2 s −1 ) after 100 cycles was effectively enhanced compared with the case of undoped NCM9055 (4.806 × 10 −11 cm 2 s −1 ). This work demonstrates that the Mg/Ti co-doping approach effectively enhanced the stability of layered Ni-rich cathode materials.

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Dual-site lattice co-doping strategy regulated crystal-structure and microstructure for enhanced cycling stability of Co-free Ni-rich layered cathode

Cited by 20 publications

References 48 publications

Structure and Charge Regulation Strategy Enabling Superior Cycling Stability of Ni-Rich Cathode Materials

Structure and Charge Regulation Strategy Enabling Superior Cycling Stability of Ni-Rich Cathode Materials

The future nickel metal supply for lithium-ion batteries

Revealing the Impact of Dual Site Modification on the Phase Transformation and Ion Transport Mechanism of Ni-Rich Cathode Materials

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