Surface modification of cathodes with nanosized amorphous MnO2 coating for high-power application in lithium-ion batteries

Kang, Bong Jo; Joo, Jaebaek; Lee, Joong Kee; Choi, Wonchang

doi:10.1016/j.jelechem.2014.06.023

Cited by 27 publications

(22 citation statements)

References 37 publications

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“…The absence of an impurity phase is noticed in the XRD patterns for all modified LiMn2O4 samples. This absence is probably due to low coating amounts and/or an amorphous texture [18,22]. Lattice parameters and cell volumes calculated by the MDI Jade Software are listed in Table 1 for all samples.…”

Section: Resultsmentioning

confidence: 99%

“…Jeong et al pointed out that the average Mn oxidation of ~3.69 on the surface of Li1.15Co0.32Mn1.53O4-coated LiMn2O4 resulted in superior rate capability and improved capacity retention at 60 °C [21]. Kang et al showed that Mn 4+ in a MnO2 coating layer can not only effectively suppress Mn dissolution, but also provide chemical stability, thereby improving storage and rate capability for MnO2-coated LiMn2O4 [22]. Therefore, the presence of Mn 4+ on the surface of LiMn2O4 particles can considerably lessen the dissolution of Mn, and maintain the stability of LiMn2O4, resulting in enhanced electrochemical performance.…”

Section: Introductionmentioning

confidence: 99%

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Improved electrochemical performance of LiMn2O4 surface-modified by a Mn4+-rich phase for rechargeable lithium-ion batteries

Han

Chen

Saito

et al. 2016

Electrochimica Acta

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The surface of spinel LiMn2O4 is modified with different quantities of a Mn 4+ -rich phase prepared by a facile sol-gel method to improve electrochemical properties at elevated temperatures. Impurityfree and uniform morphologies for the LiMn2O4 particles are demonstrated from the X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. The Mn 4+ -rich phase modified on the surface of the LiMn2O4 alleviates the dissolution of manganese in the electrolyte, thus improving the cycling performance and rate capability relative to the bare LiMn2O4. 1 wt.%modified LiMn2O4 delivers a capacity retention of 92.7% and a discharge capacity of 113.5 mAhg -1 after 200 cycles at 1 C and 25 °C, compared with that of 83.1%, and 100.8 mAhg -1 for the bare LiMn2O4. In addition, after 100 cycles, a capacity retention of 88.6% at 1 C is achieved for 1 wt.%modified LiMn2O4 at 55 °C, which is higher than the 76.0% for the bare LiMn2O4. Furthermore, this sample shows the best rate capability among all samples. The Mn 4+ -rich phase is an appropriate candidate for modifying surfaces to suppress dissolution of manganese, thereby improving the electrochemical properties of LiMn2O4.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improved electrochemical performance of LiMn2O4 surface-modified by a Mn4+-rich phase for rechargeable lithium-ion batteries

Han

Chen

Saito

et al. 2016

Electrochimica Acta

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“…Linear part in the low frequency region corresponded to the diffusion controlled Warburg impedance W. The Nyquist plots obtained for LiMn 1 .95 Co 0.025 Ni 0.025 O 4 and for Li 1.1 Mn 1 .95 Co 0.025 Ni 0.025 O 4 at different potentials during charge and discharge are shown in Figure 6. The impedance spectra were fitted using the equivalent circuit model represented in Figure 6e earlier suggested in [43]. …”

Section: Resultsmentioning

confidence: 99%

Cryochemically Processed Li1+yMn1.95Ni0.025Co0.025O4 (y = 0, 0.1) Cathode Materials for Li-Ion Batteries

et al. 2018

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A new route for the preparation of nickel and cobalt substituted spinel cathode materials (LiMn1.95Co0.025Ni0.025O4 and Li1.1Mn1.95Co0.025Ni0.025O4) by freeze-drying of acetate precursors followed by heat treatment was suggested in the present work. The experimental conditions for the preparation single-phase material with small particle size were optimized. Single-phase spinel was formed by low-temperature annealing at 700 °C. For discharge rate 0.2 C, the reversible capacities 109 and 112 mAh g−1 were obtained for LiMn1.95Co0.025Ni0.025O4 and Li1.1Mn1.95Co0.025Ni0.025O4, respectively. A good cycle performance and capacity retention about 90% after 30 cycles at discharge rate 0.2–4 C were observed for the materials cycled from 3 to 4.6 V vs. Li/Li+. Under the same conditions pure LiMn2O4 cathode materials represent a reversible capacity 94 mAh g−1 and a capacity retention about 80%. Two independent experimental techniques (cyclic voltammetry at different scan rates and electrochemical impedance spectroscopy) were used in order to investigate the diffusion kinetics of lithium. This study shows that the partial substitution of Mn in LiMn2O4 with small amounts of Ni and Co allows the cyclability and the performance of LiMn2O4-based cathode materials to be improved.

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“…MnO 2 is a well-known electrochemically active oxide that has been widely applied as an active material for the research fields of supercapacitors [39], electrocatalysis [40], and lithium-ion batteries [41]. Recently, the function of MnO 2 has extended to become a surface modification material on cathode materials, such as LiMn 2 O 4 [42], Li 3 V 2 (PO 4 ) 3 [43], and LiMn 0.333 Ni 0.333 Co 0.333 O 2 [44], in order to obtain a better electrochemical performance. Firstly, the stable MnO 2 protective layer can hinder the electrolyte from corroding the cathode particles and can optimize the formation of the SEI layer [42][43][44].…”

Section: Introductionmentioning

confidence: 99%

Exploring the Effect of a MnO2 Coating on the Electrochemical Performance of a Li1.2Mn0.54Ni0.13Co0.13O2 Cathode Material

Yang

Zheng

et al. 2021

Micromachines

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The effect of electrochemically active MnO2 as a coating material on the electrochemical properties of a Li1.2Mn0.54Ni0.13Co0.13O2 (LTMO) cathode material is explored in this article. The structural analysis indicated that the layered structure of the LTMO was unchanged after the modification with MnO2. The morphology inspection demonstrated that the rod-like LTMO particles were encapsulated by a compact coating layer. The MnO2 layer was able to hinder the electrolyte solution from corroding the LTMO particles and optimized the formation of a solid electrolyte interface (SEI). Meanwhile, lithium ions were reversibly inserted into and extracted from MnO2, which afforded an additional capacity. Compared with the bare LTMO, the MnO2-coated sample exhibited enhanced electrochemical performance. After the MnO2 coating, the first discharge capacity rose from 224.2 to 239.1 mAh/g, and the initial irreversible capacity loss declined from 78.2 to 46.0 mAh/g. Meanwhile, the cyclic retention climbed up to 88.2% after 100 cycles at 0.5 C, which was more competitive than that of the bare LTMO with a value of 71.1%. When discharging at a high current density of 2 C, the capacity increased from 100.5 to 136.9 mAh/g after the modification. These investigations may be conducive to the practical application of LTMO in prospective automotive Li-ion batteries.

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Surface modification of cathodes with nanosized amorphous MnO2 coating for high-power application in lithium-ion batteries

Cited by 27 publications

References 37 publications

Improved electrochemical performance of LiMn2O4 surface-modified by a Mn4+-rich phase for rechargeable lithium-ion batteries

Improved electrochemical performance of LiMn2O4 surface-modified by a Mn4+-rich phase for rechargeable lithium-ion batteries

Cryochemically Processed Li1+yMn1.95Ni0.025Co0.025O4 (y = 0, 0.1) Cathode Materials for Li-Ion Batteries

Exploring the Effect of a MnO2 Coating on the Electrochemical Performance of a Li1.2Mn0.54Ni0.13Co0.13O2 Cathode Material

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