Evolution mechanism of phase transformation of Li-rich cathode materials in cycling

Cui, Shao-Lun; Wang, Yangyang; Liu, Sheng; Li, Guo‐Ran; Gao, Xueping

doi:10.1016/j.electacta.2019.135109

Cited by 52 publications

(27 citation statements)

References 49 publications

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“…conducted cyclic voltammetry test on Li 1.2 Ni 0.13 Co 0.13 Mn 0.54 O 2 . [ 40 ] According to the test results, the obvious oxidation peak appearing at 4.73 V in the first CV curve was associated closely to an irreversible oxygen loss from the lattice due to the activation of the Li 2 MnO 3 domain. The oxidation peak at 4.70 V in the following cyclic voltammetry curves becomes very weak or even disappears, which fully indicates the irreversible oxygen loss in initial cycle.…”

Section: Basic Mechanism Of Interface Structure Degradationmentioning

confidence: 99%

Interfacial Degradation and Optimization of Li‐rich Cathode Materials^†

Zhao

Lai

et al. 2021

Chin. J. Chem.

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High‐energy and safe lithium ion batteries (LIBs) are in increasing need as the rapid development of electronic devices, electric vehicles, as well as energy storage station. Li‐rich oxides have attracted a lot of attention due to their high capacity and low cost as cathode material for LIBs. However, they still suffer from the vulnerable cathode/ electrolyte interface, which presents the huge challenges of surface degradation and gas release, particularly at high state of charge. Some issues of Li‐rich cathode materials, such as moderate cycle stability and voltage decay, are in tight connection with electrode‐electrolyte interfacial side reactions. Research in the area of interfacial degradation mechanism and optimization strategies is of great significance as for Li‐rich cathode, and extensive efforts have been poured. This review aims to understand the degradation mechanism of Li‐rich cathode materials, and summarize the corresponding valuable and effective optimization strategies. Based on these considerations, we also have discussed the remaining challenges and the future research direction.

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Section: Basic Mechanism Of Interface Structure Degradationmentioning

confidence: 99%

Interfacial Degradation and Optimization of Li‐rich Cathode Materials^†

Zhao

Lai

et al. 2021

Chin. J. Chem.

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“…1c). 114,115 As the transition metals are partially replaced by lithium ions, the coordination environment of oxide ions involves a specic axis of Li-O-Li, along which an oxygen 2p orbital remains nonbonding near 3 F to contribute to the charge compensation for (de)lithiation (additional D(3), Fig. 3b).…”

Section: Origins Of Large Capacity/high Voltagementioning

confidence: 99%

Designing positive electrodes with high energy density for lithium-ion batteries

Okubo

Dwibedi

et al. 2021

J. Mater. Chem. A

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Section: Introductionmentioning

confidence: 99%

“…With the increasing demands for portable electronic devices, electric vehicles, and large-scale energy storage equipment, lithium-ion batteries have developed rapidly in the past three decades as the main power source. 1 And the overall energy density in the battery system mainly depends on the electrochemical properties of cathode materials. 2 Currently, layered LiCoO 2 , ternary LiNi x Co y Mn 1−x−y O 2 (NCM), spinel LiMn 2 O 4 , and olivine LiFePO 4 are the most commonly used cathode materials in lithium-ion batteries.…”

Section: ■ Introductionmentioning

confidence: 99%

Enabling LiNi_0.88Co_0.09Al_0.03O₂ Cathode Materials with Stable Interface by Modifying Electrolyte with Trimethyl Borate

Xiao

Cui

Wang

et al. 2021

ACS Sustainable Chem. Eng.

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As one of the most promising cathode materials in lithium-ion batteries, nickel-rich cathode materials have been widely studied due to their high specific capacity and high operating voltage to realize the energy density of 300 Wh kg −1 . However, the oxidative decomposition of electrolyte catalyzed by transition metal ions and the crack of secondary particles have brought great challenges to their further development. In order to solve this problem, functionalized electrolyte is often used to stabilize the interface and structure of cathode materials. Herein, it is proposed to add trimethyl borate (TMB) in commercial electrolyte to enhance the interfacial stability of Li-Ni 0.88 Co 0.09 Al 0.03 O 2 cathode material. By adjusting the content of TMB in the electrolyte, it is found that a volume ratio of 10% can achieve the best electrochemical performance. In the voltage range of 3.0−4.3 V, the LiNi 0.88 Co 0.09 Al 0.03 O 2 electrode with the 10% TMB-containing electrolyte can achieve a capacity retention of up to 82% after 300 cycles at 1C rate (1C = 200 mA g −1 ), while the electrode with blank electrolyte is only 61%. Through a systematic analysis toward cycled electrode materials, it is indicated that the cracking degree of secondary particles decreases and a thin, stable, and conductive cathode electrolyte interface film is formed on the electrode with 10% TMB-containing electrolyte. This simple and effective method of improving the interfacial and structural stability of nickel-rich cathode materials via adding TMB in the electrolyte provides a practical strategy for the development of highperformance lithium-ion batteries.

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Evolution mechanism of phase transformation of Li-rich cathode materials in cycling

Cited by 52 publications

References 49 publications

Interfacial Degradation and Optimization of Li‐rich Cathode Materials^†

Interfacial Degradation and Optimization of Li‐rich Cathode Materials^†

Designing positive electrodes with high energy density for lithium-ion batteries

Enabling LiNi_0.88Co_0.09Al_0.03O₂ Cathode Materials with Stable Interface by Modifying Electrolyte with Trimethyl Borate

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Evolution mechanism of phase transformation of Li-rich cathode materials in cycling

Cited by 52 publications

References 49 publications

Interfacial Degradation and Optimization of Li‐rich Cathode Materials†

Interfacial Degradation and Optimization of Li‐rich Cathode Materials†

Designing positive electrodes with high energy density for lithium-ion batteries

Enabling LiNi0.88Co0.09Al0.03O2 Cathode Materials with Stable Interface by Modifying Electrolyte with Trimethyl Borate

Contact Info

Product

Resources

About

Interfacial Degradation and Optimization of Li‐rich Cathode Materials^†

Interfacial Degradation and Optimization of Li‐rich Cathode Materials^†

Enabling LiNi_0.88Co_0.09Al_0.03O₂ Cathode Materials with Stable Interface by Modifying Electrolyte with Trimethyl Borate