High rate cycling performance of nanosized Li4Ti5O12/graphene composites for lithium ion batteries

Liu, Haiping; Wen, Guangwu; Bi, Sifu; Wang, Chunyu; Hao, Jingmin; Gao, Peng

doi:10.1016/j.electacta.2016.01.180

Cited by 64 publications

(19 citation statements)

References 44 publications

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“…Further, we calculated the values of Rs and Rct, which are related to the resistance of the electrolyte and the charge transfer resistance at the particle/electrolyte interface, respectively [47]. The results are shown in Table 2.…”

Section: Resultsmentioning

confidence: 99%

“…In the plot there are five semicircles in the high frequency range, which corresponds to the charge-transfer resistance. Meanwhile, there are five straight lines with different slopes at low frequency, which are related to the lithium-diffusion process [47]. It is convincing that the resistance of LiNi0.5Mn1.5−xSnxO4 (x = 0.02) is obviously lower than the other samples, indicating a higher lithium-diffusion coefficient and lower charge-transfer resistance of the LiNi0.5Mn1.5−xSnxO4 (x = 0.02) material than the primitive LiNi0.5Mn1.5O4 material.…”

Section: Resultsmentioning

confidence: 99%

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Synthesis and electrochemical performance of Sn-doped LiNi0.5Mn1.5O4 cathode material for high-voltage lithium-ion batteries

Hao

et al. 2017

Sci. China Mater.

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LiNi0.5Mn1.5−xSnxO4 (0 ≤ x ≤ 0.1) cathode materials with uniform and fine particle sizes were successfully synthesized by a two-step calcination of solid-state reaction method. As the cathode materials for lithium ion batteries, the LiNi0.5Mn1.48Sn0.02O4 shows the highest specific capacity and cycle stability. In the potential range of 3.5-4.9 V at room temperature, LiNi0.5Mn1.48Sn0.02O4 composite material shows a discharge capacity of more than 117 mA h g −1 at 0.1 C, while the corresponding discharge capacity of undoped LiNi0.5Mn1.5O4 is only 101 mA h g −1 . Moreover, in cycle performance, all the LiNi0.5Mn1.5−xSnxO4 (0 ≤ x ≤ 0.1) samples show better capacity retention than the undoped LiNi0.5Mn1.5O4 at 1 C rate after 100 cycles. Especially, for the LiNi0.5Mn1.5O4, the discharge capacity after 100 cycles is 90 mA h g −1 , while the corresponding discharge capacities of the undoped LiNi0.5Mn1.5O4 is only 56.1 mA h g −1 . The significantly enhanced DLi + and the enlarged electronic conductivity make the Sn-doped spinel LiNi0.5Mn1.5O4 material present even more excellent electrochemical performances. These results reveal that Sn-doping is an effective way to improve electrochemical performances of LiNi0.5Mn1.5O4.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Synthesis and electrochemical performance of Sn-doped LiNi0.5Mn1.5O4 cathode material for high-voltage lithium-ion batteries

Hao

et al. 2017

Sci. China Mater.

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“…The lithium-ion diffusion coefficient (DLi) can be calculated from the plots in the low-frequency region, which represents the diffusion ability of lithium-ion in the bulk of electrode material. The diffusion coefficient values by EIS can be calculated according to equation [43,44]: …”

Section: Resultsmentioning

confidence: 99%

Enhanced electrochemical performance of Li-rich low-Co Li1.2Mn0.56Ni0.16Co0.08−x Al x O2 (0≤x≤0.08) as cathode materials

Han

Yang

et al. 2016

Sci. China Mater.

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Layered Li1.2Mn0.56Ni0.16Co0.08−xAlxO2 (0 ≤ x ≤ 0.08) cathode materials were successfully synthesized by a sol-gel method. X-ray diffraction and the refinement data indicate that all materials have typical α-NaFeO2 structure with R-3m space group, and the a-axis has almost no change, but there is a slight decrease in the c lattice parameter as well as the cell volume. Scanning electron microscopy and high resolution transmission electron microscopy prove that all the samples have uniform particle size of about 200-300 nm and smooth surface. The energy-dispersive X-ray spectroscopy mapping shows that aluminum has been homogeneously doped in the Li1.2Mn0.56Ni0.16Co0.08O2 cathode material. The cyclic voltammetry and electrochemical impedance spectroscopy reveal that appropriate Al-doping contributes to the reversible lithium-ion insertion and extraction, and then reduces the electrochemical polarization and charge transfer resistance. Li1.2Mn0.56Ni0.16Co0.08−xAlxO2 (x = 0.05) shows the lowest charge transfer resistance and the highest lithium-ion diffusion coefficient among all the samples. The Li-rich electrodes with low-level Al doping shows a much higher discharge capacity than the pristine one, especially the Li1.2Mn0.56Ni0.16Co0.08−xAlxO2 (x = 0.05) sample, which exhibits greater rate capacity and better fast charge-discharge performance than the other samples. Li1.2Mn0.56Ni0.16Co0.08−xAlxO2 (x = 0.05) also exhibits higher discharge capacity than the pristine one at each cycle at 55°C. These results clearly indicate that the high rate capacity together with a good high rate cycling performance and high-temperature performance of the low-Co Li1.2Mn0.56Ni0.16Co0.08−xAlxO2 (x=0.05) is a promising alternative to next-generation lithium-ion batteries.

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“…Materials of intercalation, such as lithium cobalt oxide (LiCoO 2 ), 1,2 lithium iron phosphate (LiFePO 4 ), 3,4 lithium titanate oxide (LTO) 5,6 and graphite, 7,8 are commonly found in electrodes of commercially lithium-ion cells. In addition to the mentioned intercalation materials, there are many others that are currently being studied or used as electrodes in lithium-ion cells.…”

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confidence: 99%

Shedding Light on the Entropy Change Found for the Transition Stage II→Stage I of Li-Ion Storage in Graphite

Leiva

Perassi

Barraco

2016

J. Electrochem. Soc.

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In order to examine the controversial hypothesis put forward to explain the entropy step experimentally observed for the stage II to stage I transition for lithium intercalation in graphite, a transparent statistical mechanical model is developed. The results obtained show that the entropy increase can be explained by the change of configurational entropy occurring at occupation of half of the lattice. Comparison with experimental data shows that attractive interactions between intercalated particles in the same layer must be assumed, in agreement with the ansatz made in the original experimental work. 5,6 and graphite, 7,8 are commonly found in electrodes of commercially lithium-ion cells. In addition to the mentioned intercalation materials, there are many others that are currently being studied or used as electrodes in lithium-ion cells. In particular, graphite is the most common material found in anodes of commercial lithium-ion cells.One of the most important features of the intercalation materials is that they can have ions stored in them with little changes in their crystalline structures. This feature allows a fast ion insertion and extraction and therefore high power density cells can be obtained when used as electrodes. However, a fast ion insertion and extraction generates heat in the cell, which can produce high temperature excursions of the cell and a premature aging.It has been demonstrated that a great portion of the heat that is generated in the intercalation materials comes from the intercalation entropy during a discharge. [9][10][11] In this sense, different methods to measure the intercalation entropy have been developed. [12][13][14][15][16][17] In the case of Li-ion insertion into graphite, the experimental curve for entropy as a function of composition, Reference 12, shows a step in the transition of stage II to stage I that could not be explained in the terms presented there. In a subsequent work, 18 two of the previous authors, state that a possible mechanism of the stage I phase formation may involve a 'dilute lithium layer' (noted dil-Li) that would have an alternating 'normal' Li layer (Li) with a hexagonal structure and a dilute lithium layer following the sequence (Li)-G-(dil-Li)-G. However, in a more recent review, Fultz 19 stated that the vibrational entropy resulting from the insertion dominates the entropy, and also he added that there should be a small change in the configurational entropy when compounds are formed in stage I or II, as they are ordered.In a previous work 20 we have proposed a theoretical approach to determine the intercalation entropy, and we applied this approach to the graphite/lithium compound. In order to clarify the origin of this entropy, in the present work we have used a simplified two-level lattice gas model to analyze the configurational contribution to the intercalation entropy of the graphite/lithium compound. The main features of the intercalation entropy are elucidated. z E-mail: eze_leiva@yahoo.com.ar Model and Statistical Mechanical Backgroun...

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High rate cycling performance of nanosized Li4Ti5O12/graphene composites for lithium ion batteries

Cited by 64 publications

References 44 publications

Synthesis and electrochemical performance of Sn-doped LiNi0.5Mn1.5O4 cathode material for high-voltage lithium-ion batteries

Synthesis and electrochemical performance of Sn-doped LiNi0.5Mn1.5O4 cathode material for high-voltage lithium-ion batteries

Enhanced electrochemical performance of Li-rich low-Co Li1.2Mn0.56Ni0.16Co0.08−x Al x O2 (0≤x≤0.08) as cathode materials

Shedding Light on the Entropy Change Found for the Transition Stage II→Stage I of Li-Ion Storage in Graphite

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