The Role of Sodium in LiNi0.8Co0.15Al0.05O2 Cathode Material and Its Electrochemical Behaviors

Xie, Hongbin; Du, Ke; Hu, Guorong; Peng, Zhongdong; Cao, Yanbing

doi:10.1021/acs.jpcc.5b12407

Cited by 158 publications

(85 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As can be seen from the figure, all samples show three pairs of reduction and oxidation peaks, which are caused by the complex three phase transitions of hexagonal phase to monoclinic phase (H1-M), monoclinic phase to hexagonal phase (M-H2), and hexagonal phase to hexagonal phase (H2-H3) during the extraction and insertion of lithium ion. Such findings are consistent with the earlier reports from Xie, H 19, 25 and Zhou, P 26 . In the H1-M redox peaks, the sample of redox voltage gap is 0.1779 V, 0.1564 V, 0.1179 and 0.1485 V, respectively.…”

Section: Resultssupporting

confidence: 94%

LiNi0.8Co0.15Al0.05O2: Enhanced Electrochemical Performance From Reduced Cationic Disordering in Li Slab

Xiao

Chen

et al. 2017

Sci Rep

View full text Add to dashboard Cite

Sub-micron sized LiNi0.8Co0.15Al0.05O2 cathode materials with improved electrochemical performance caused by the reduced cationic disordering in Li slab were synthesized through a solid state reaction routine. In a typical process, spherical precursor powder was prepared by spray drying of a uniform suspension obtained from the ball-milling of the mixture of the starting raw materials. Then the precursor powders were pressed into tablets under different pressures and crushed into powder. The pressing treated powders were finally calcinated under oxygen atmosphere to obtain the target cathode materials. XRD investigation revealed a hexagonal layered structure without impurity phase for all samples and significant increase in the diffraction intensity ratio of I(003)/I(104) was observed. Rietveld refinement further confirmed the reduced cationic disordering in Li slab by such pressing treatment, and the smallest disordering was observed for sample S4 with only 1.3% Ni ions on Li lattice position. The electrochemical testing showed an improvement in electrochemical behavior for those pressing treated samples. The calculation of diffusion coefficients using EIS data showed improved Li diffusion coefficient after pressing treatment. The sample S4 presented a diffusion coefficient of 4.36 × 10−11 cm2·s−1, which is almost 3.5 times the value of untreated sample.

show abstract

Section: Resultssupporting

confidence: 94%

LiNi0.8Co0.15Al0.05O2: Enhanced Electrochemical Performance From Reduced Cationic Disordering in Li Slab

Xiao

Chen

et al. 2017

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Energy Mater. Xie et al [44] found the similar results in Na + doping LiNi 0.8 Co 0.15 Al 0.05 O 2 cathode. As shown in Figure 6a, the XRD patterns of the PAN10, PVDF10, and CMC electrodes before cycling do not exhibit any obvious differences.…”

Section: Suppressing the Voltage Fadingsupporting

confidence: 56%

“…2017, 7, 1601066 www.advenergymat.de www.advancedsciencenews.com Figure 6 shows the X-ray diffraction (XRD) patterns and the corresponding refined data from XRD of the Li 1.2 Ni 0.13 Co 0.13 Mn 0.54 O 2 electrodes before cycling and after 500 cycles. [44] Figure S8 (Supporting Information) displays the XRD patterns of the Li 1.2 Ni 0.13 Co 0.13 Mn 0.54 O 2 cathode material at different cycles. All diffraction peaks can be indexed as a hexagonal unit cell with R-3m symmetry(ICSD #99890) as reported by Nahm and co-workers.…”

Section: Suppressing the Voltage Fadingmentioning

confidence: 99%

A Novel Strategy to Suppress Capacity and Voltage Fading of Li‐ and Mn‐Rich Layered Oxide Cathode Material for Lithium‐Ion Batteries

Zhang

Gu²,

Pan

et al. 2016

Advanced Energy Materials

157

113

View full text Add to dashboard Cite

energy density of commercialized LIBs still cannot meet the requirements for practical applications. Success in these fields will mostly depend on further studying and developing new electrode materials with higher energy density.Li-and Mn-rich layered oxide (LMRO) has been considered as a promising cathode material for the next-generation LIBs due to its high energy density more than 1000 W h kg −1 . [3][4][5][6][7] However, this material also suffers from several fatal drawbacks, such as severe capacity and voltage fading during cycling, [8][9][10] poor rate performance, [5,11,12] large initial irreversible capacity. [13,14] Among these problems, the capacity and voltage fading are the key scientific issues needing to be solved first. It is generally accepted that the structure instability of the LMRO cathode material is one of the intrinsic reasons of its fast capacity and voltage fading. [15][16][17] The phase transformation from layered to spinel structure gives rise to the crystal instability when the LMRO cathode is charged to 4.8 V. [18][19][20][21] The gradual growth of spinel phase during cycling brings about the appearance of a 3.0 V plateau resulting in the voltage fading and then consequently leading to the capacity fading. [22] On the other hand, the capacity fading is also caused by the dissolution of metal elements into the electrolyte. [23,24] Zheng et al. [8] believe that the loss of MnO and NiO results in the capacity loss of the Li[Li 0.2 Ni 0.2 Mn 0.6 ]O 2 electrode because of the formation of spinel phase and subsequent fragmentation and deactivation of transition metal ions. Moreover, the dissolution of metal elements is also due to the corrosion of hydroflouric acid (HF) coming from the reaction of the residual moisture with LiPF 6 . [25] Presently, several strategies have been proposed to suppress the capacity and voltage fading of LMRO cathode material. Surface coating with inert phases is one of the effective ways, such as MnO x , [26,27] Al 2 O 3 , [28,29] MoO 3 , [13] TiO 2 , [30] ZrO 2 , [31] AlPO 4 , [32,33] AlF 3, [34,35] to stabilize the structure of the LMRO cathode materials. Choi et al. [36] reported that the 0.3Li 2 MnO 3 -0.7LiMn 0.60 Ni 0.25 Co 0.15 O 2 cathode material coated by Al 2 O 3 improved not only its discharge capacity but also its cycling stability compared with the prinstine. Guo et al. [37] discovered that the Li 1.2 Ni 0.16 Co 0.068 Mn 0.56 O 2 coated by 3 wt% MnO 2 delivered the capacity retention of 93% after 50 cycles. Chen et al. [38] demonstrated that CePO 4 layer coating onto Poor cycling stability is one of the key scientific issues needing to be solved for Li-and Mn-rich layered oxide cathode. In this paper, sodium carboxymethyl cellulose (CMC) is first used as a novel binder in Li 1.2 Ni 0.13 Co 0.13 Mn 0.54 O 2 cathode to enhance its cycling stability. Electrochemical performance is conducted by galvanostatic charge and discharge. Structure and morphology are characterized by X-ray diffraction, scanning electronic microscopy, high-resolution transmiss...

show abstract

“…In the CV curve, the peak currents represent the electrochemical properties of the material and express the phase transitions that occur during the intercalation/deintercalation of lithium ions [28,29]. During the charge and discharge process, three pairs of peaks can be observed (I-I , II-II , and III-III ) in the CV diagram, which are attributed to hexagonal to monoclinic, monoclinic to hexagonal, and hexagonal to hexagonal phase transitions, respectively [30,31] In the case of NCA, the oxidation peaks around 3.84, 4.02, and 4.20 V denote I, II, and III, respectively.…”

Section: Resultsmentioning

confidence: 99%

Effect of Metal (Mn, Ti) Doping on NCA Cathode Materials for Lithium Ion Batteries

Wan

Fan

Baasanjav

et al. 2018

Journal of Nanomaterials

View full text Add to dashboard Cite

NCA (LiNi 0.85 Co 0.10 Al 0.05−x M x O 2 , M=Mn or Ti, < 0.01) cathode materials are prepared by a hydrothermal reaction at 170 ∘ C and doped with Mn and Ti to improve their electrochemical properties. The crystalline phases and morphologies of various NCA cathode materials are characterized by XRD, FE-SEM, and particle size distribution analysis. The CV, EIS, and galvanostatic charge/discharge test are employed to determine the electrochemical properties of the cathode materials. Mn and Ti doping resulted in cell volume expansion. This larger volume also improved the electrochemical properties of the cathode materials because Mn 4+and Ti 4+ were introduced into the octahedral lattice space occupied by the Li-ions to expand the Li layer spacing and, thereby, improved the lithium diffusion kinetics. As a result, the NCA-Ti electrode exhibited superior performance with a high discharge capacity of 179.6 mAh g −1 after the first cycle, almost 23 mAh g −1 higher than that obtained with the undoped NCA electrode, and 166.7 mAh g −1 after 30 cycles. A good coulombic efficiency of 88.6% for the NCA-Ti electrode is observed based on calculations in the first charge and discharge capacities. In addition, the NCA-Ti cathode material exhibited the best cycling stability of 93% up to 30 cycles.

show abstract

The Role of Sodium in LiNi_0.8Co_0.15Al_0.05O₂ Cathode Material and Its Electrochemical Behaviors

Cited by 158 publications

References 37 publications

LiNi0.8Co0.15Al0.05O2: Enhanced Electrochemical Performance From Reduced Cationic Disordering in Li Slab

LiNi0.8Co0.15Al0.05O2: Enhanced Electrochemical Performance From Reduced Cationic Disordering in Li Slab

A Novel Strategy to Suppress Capacity and Voltage Fading of Li‐ and Mn‐Rich Layered Oxide Cathode Material for Lithium‐Ion Batteries

Effect of Metal (Mn, Ti) Doping on NCA Cathode Materials for Lithium Ion Batteries

Contact Info

Product

Resources

About