Enhanced electrochemical properties of the Cd-modified LiNi0.6Co0.2Mn0.2O2 cathode materials at high cut-off voltage

Chen, Yong-Xiang; Li, Yunjiao; Tang, Shuyun; Lei, Tongxing; Deng, Shiyi; Xue, Longlong; Cao, Guolin; Zhu, Jing

doi:10.1016/j.jpowsour.2018.05.088

Cited by 68 publications

(26 citation statements)

References 55 publications

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“…Doping has been widely demonstrated to be the simplest approach for enhancing the structural and thermal stabilities of the Ni-rich cathodes. Typically, to date, a wide range of dopants including cations doping (Mg, [211,242] Al, [67,129,140,[243][244][245][246] Ti, [209,211] Zr, [208,[247][248][249] Nb, [250] Cd, [251] Ce, [252] Mo, [87] Ca, [253] Ta, [211] V, [254] Na [255,256] W, [257,258] and B, [132,259] ) and anions doping (F, [260,261] Cl, [262] and S, [263] ) have been introduced into the Ni-rich cathodes. The origins for the obviously improved structural stabilities by doping are closely associated with the three aspects as follows: i) the reinforcement of the bonding energy between TM ions and oxygen, ii) the suppression of the detrimental phase distortion from the layered to rocksalt structure, and iii) the promotion of the Li-ion migration thanks to increased Li slab distance by the dopants.…”

Section: Bulk and Surface Graded Dopingmentioning

confidence: 99%

Surface/Interface Structure Degradation of Ni‐Rich Layered Oxide Cathodes toward Lithium‐Ion Batteries: Fundamental Mechanisms and Remedying Strategies

Liang

Zhang

Zhao

et al. 2019

Adv Materials Inter

144

111

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Nickel‐rich layered transition‐metal oxides with high‐capacity and high‐power capabilities are established as the principal cathode candidates for next‐generation lithium‐ion batteries. However, several intractable issues such as the poor thermal stability and rapid capacity fade as well as the air‐sensitivity particularly for the Ni content over 80% have seriously restricted their broadly practical applications. The properties and nature of the stable surface/interface, where the Li+ shuttles back and forth between the cathode and electrolyte, play a significant role in their ultimate lithium‐storage performance and industrial processability. Thus, tremendous efforts are made to in‐depth understanding of the essential origins of surface/interface structure degradation and efficient surface modification methodologies are intensively explored. The purpose of the contribution is first to provide a comprehensive review of the up‐to‐date mechanisms proposed to rationally elucidate the surface/interface behaviors, and then, focus on recent developed strategies to optimize the surface/interface structure and chemistry including synthetic condition regulation, surface doping, surface coating, dual doping‐coating modification, and concentration‐gradient structure as well as electrolyte additives. Finally, the perspective on future research trends and feasible approaches toward advanced Ni‐rich cathodes with stable surface/interface is presented briefly.

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Section: Bulk and Surface Graded Dopingmentioning

confidence: 99%

Surface/Interface Structure Degradation of Ni‐Rich Layered Oxide Cathodes toward Lithium‐Ion Batteries: Fundamental Mechanisms and Remedying Strategies

Liang

Zhang

Zhao

et al. 2019

Adv Materials Inter

144

111

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“…[37] It generally believes that cathodic-anodic peak potential difference (~E) stands for the degree of irreversible. [38] The~E 1 ,~E 2 , and~E 3 of 0.5 %-NCM622@BTO at the 1 st , 2 nd , and 3 rd cycles are 117, 61, and 56 mV, respectively. At the same time, the~E' 1 ,~E' 2 , and~E' 3 are 174, 128, and 117 mV of pristine NCM622.…”

Section: Resultsmentioning

confidence: 92%

Rational Design of a Piezoelectric BaTiO₃ Nanodot Surface‐Modified LiNi_0.6Co_0.2Mn_0.2O₂ Cathode Material for High‐Rate Lithium‐Ion Batteries

Wang

et al. 2020

ChemElectroChem

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Nickel‐rich cathode materials have been regarded as the most promising candidates for lithium‐ion batteries because of their superior specific capacity and cost‐effectiveness. However, the rapid capacity fade under high current density and serious side reactions during long‐term cycling hinder its wide application. In this study, piezoelectric BaTiO3 nanodots are employed as a functional coating layer on the LiNi0.6Co0.2Mn0.2O2 cathode material to balance the relationship between structure and performance. A three‐phase interface model is proposed including the LiNi0.6Co0.2Mn0.2O2 cathode material, uniform piezoelectric BaTiO3 nanodots, and the electrolyte. The coating layer plays a key role in the rapid diffusion of lithium‐ions as well as stabilizing the bulk structure of the cathode materials. Furthermore, the possible by‐products generated during the electrochemical cycling that can be alleviated by the modification of BaTiO3 are detected by using differential electrochemical mass spectrometry. As expected, our strategy efficiently improves the structural stability and holds a high‐rate performance.

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“…The cells after 100 cycles at 1 C rate over 3.0–4.6 V at 25 °C were disassembled in the argon‐filled glove box (LS800 S, DELLIS, Chengdu, China) and the obtained cathodes were washed with dimethyl carbonate (DMC) repeatedly to remove the residual electrolyte, and then the cathodes were dried in vacuum oven at 45 °C for analyzing. Energy disperse spectroscopy (EDS) was carried out to semi‐quantitatively analyze the amount of elements in the cycled cathodes.…”

Section: Methodsmentioning

confidence: 99%

Suppressing Nickel Dissolution in Ni‐rich Layered Oxide Cathodes Using NiF₂ as Electrolyte Additive

Zhang

Xue

et al. 2019

ChemElectroChem

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The dissolution of transition metals is the main reason for the capacity fading and structural degradation of Ni‐rich cathode materials. In this work, NiF2 is used as functional electrolyte additive for the first time to improve the performance of LiNi0.6Co0.2Mn0.2O2 cathodes by the chemical‐equilibrium principle. The suppression of transition‐metal dissolution, especially Ni, is proved by energy disperse spectroscopy and inductively coupled plasma analyses. The NiF2 additive can stabilize the cathode structure by relieving the dissolution of transition metals, which is confirmed by morphology and structure analyses. Moreover, the NiF2 additive also reduces side reactions of the cell, which is verified by self‐discharge tests and coulombic efficiency analysis. As a result, the addition of 100 ppm NiF2 elevates the capacity retention of the Li/NCM622 half‐cell from 69.53 to 79.67 % after 100 cycles, and the 100 ppm NiF2‐containing cathode delivers an initial capacity of 174.0 mAh g−1 even at 8 C after 50 cycles.

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Enhanced electrochemical properties of the Cd-modified LiNi0.6Co0.2Mn0.2O2 cathode materials at high cut-off voltage

Cited by 68 publications

References 55 publications

Surface/Interface Structure Degradation of Ni‐Rich Layered Oxide Cathodes toward Lithium‐Ion Batteries: Fundamental Mechanisms and Remedying Strategies

Surface/Interface Structure Degradation of Ni‐Rich Layered Oxide Cathodes toward Lithium‐Ion Batteries: Fundamental Mechanisms and Remedying Strategies

Rational Design of a Piezoelectric BaTiO₃ Nanodot Surface‐Modified LiNi_0.6Co_0.2Mn_0.2O₂ Cathode Material for High‐Rate Lithium‐Ion Batteries

Suppressing Nickel Dissolution in Ni‐rich Layered Oxide Cathodes Using NiF₂ as Electrolyte Additive

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Enhanced electrochemical properties of the Cd-modified LiNi0.6Co0.2Mn0.2O2 cathode materials at high cut-off voltage

Cited by 68 publications

References 55 publications

Surface/Interface Structure Degradation of Ni‐Rich Layered Oxide Cathodes toward Lithium‐Ion Batteries: Fundamental Mechanisms and Remedying Strategies

Surface/Interface Structure Degradation of Ni‐Rich Layered Oxide Cathodes toward Lithium‐Ion Batteries: Fundamental Mechanisms and Remedying Strategies

Rational Design of a Piezoelectric BaTiO3 Nanodot Surface‐Modified LiNi0.6Co0.2Mn0.2O2 Cathode Material for High‐Rate Lithium‐Ion Batteries

Suppressing Nickel Dissolution in Ni‐rich Layered Oxide Cathodes Using NiF2 as Electrolyte Additive

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Product

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About

Rational Design of a Piezoelectric BaTiO₃ Nanodot Surface‐Modified LiNi_0.6Co_0.2Mn_0.2O₂ Cathode Material for High‐Rate Lithium‐Ion Batteries

Suppressing Nickel Dissolution in Ni‐rich Layered Oxide Cathodes Using NiF₂ as Electrolyte Additive