Effects of polyvinyl alcohol on the electrochemical performance of LiNi0.8Co0.15Al0.05O2 cathode material

Jiang, Qi; Gao, Yike; Peng, Junqi; Li, Huan; Liu, Qingqing; Jiang, Li; Lü, Xiaoying; Ailin, Hu

doi:10.1007/s10008-018-4085-x

Cited by 8 publications

(4 citation statements)

References 22 publications

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“…And the line in the low frequency region corresponds to the Warburg impedance (Z w ) of Li + diffusion. 22 Also the slope of the Z′-ω −1/2 curve in Fig. 4f shows the Warburg constant (σ ω ).…”

Section: Resultsmentioning

confidence: 99%

Effects of Lithium Salt Addition Methods on the High-Temperature Electrochemical Performance of LiMn₂O₄

Chaolian¹,

Zhang²,

Gao³

et al. 2021

J. Electrochem. Soc.

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The poor high-temperature stability of spinel LiMn2O4 cathode material has become a bottleneck hindering its large-scale application. To enhance its high-temperature electrochemical performance, the effects of two different methods of lithium salt addition on its high-temperature electrochemical performance were studied. Two methods, Li+ infiltration and solid phase mixing, were used to prepare spinel LiMn2O4 cathode material by the same high-temperature solid phase method, respectively. The obtained materials were characterized by X-ray diffraction, scanning electron microscopy, Raman, and particle size analysis. Electrochemical performance tests were carried out on the electrochemical equipment by assembling into a half-battery. The results show that the material obtained by the lithium salt solid phase mixing method presents a loose structure composed of small primary particles to form a spherical secondary particle. However, the material obtained by the Li+ infiltration method presents an octahedral crystal structure, showing a trend toward single crystal. At the same time, its calcination time is greatly shortened (from 26 to 6 h) at the same calcination temperature. The electrochemical performance test results at 55 °C show that the LiMn2O4 prepared by Li+ infiltration has a better high-temperature electrochemical performance.

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Section: Resultsmentioning

confidence: 99%

Effects of Lithium Salt Addition Methods on the High-Temperature Electrochemical Performance of LiMn₂O₄

Chaolian¹,

Zhang²,

Gao³

et al. 2021

J. Electrochem. Soc.

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“…The inclined line is ascribed to the Warburg impedance of Li + diffusion in bulk electrode. 28 The Warburg factor (σ ω ) can be calculated by the slopes of the plots in Fig. 5f.…”

Section: Resultsmentioning

confidence: 99%

Preparation of Spheroidal Spinel LiMn₂O₄ and Its High Temperature Performance

Gao

Peng

Duan

et al. 2019

J. Electrochem. Soc.

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In view of the high temperature instability of spinel LiMn 2 O 4 , a combination of elemental doping, material coating and morphology controlling was designed to improve its high temperature performance in this paper. The spherical MnO 2 intermediate was prepared by the action of organic polyvinylpyrrolidone and ethylene glycol. Then, under the coating and doping of graphene and Al, a spheroidal LiMn 2 O 4 material was obtained. The obtained materials were characterized by XRD, SEM, particle size analysis and electrochemical performance test. The results show that the introduction of graphene and Al can reduce the unit cell volume of LiMn 2 O 4 , shorten the interplanar spacing of each crystal plane, improve the stability of the unit cell and maintain its spherical structure. Amongst which, Al doping can greatly reduce the particle size. The electrochemical performance test at 55°C shows that simultaneous Al doping and graphene coating can not only maintain the spheroidal structure of LiMn 2 O 4 cathode material, but also make it have good electrochemical properties: the initial discharge capacity can be up to 123.4 mAh.g −1 at 0.2 C rate and there is a discharge capacity of 101.2 mAh g −1 after 100 cycles. The sample with only graphene coating has a capacity of 91.7 mAh.g −1 after 100 cycles, while the sample without Al doping and graphene coating has a capacity of only 22.4 mAh.g −1 after 100 cycles.

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“…Alternatively, NCA with a rod-like morphology was fabricated by the use of an oxalate-based template in order to aid in the simultaneous enhancement of electronic and ionic conductivity, besides the high electrode|electrolyte contact area. 21 However, the material was reported to demonstrate relatively low capacities at higher currents, which could be attributed to the local structure collapses in the onedimensional (1-D) material, thus influencing diffusion of the Li + ions in a more severe manner than sphere-like particles, blocking the diffusion pathways.…”

Section: ■ Introductionmentioning

confidence: 99%

“…The study exhibited promising initial delivered capacity and long cycle life due to facilitated electrolyte diffusion enabling effective surface reactions in Li metal cells; however, the unavailability of the full-cell tests restricts evaluation of the applicability of the materials in practical applications. Alternatively, NCA with a rod-like morphology was fabricated by the use of an oxalate-based template in order to aid in the simultaneous enhancement of electronic and ionic conductivity, besides the high electrode|electrolyte contact area . However, the material was reported to demonstrate relatively low capacities at higher currents, which could be attributed to the local structure collapses in the one-dimensional (1-D) material, thus influencing diffusion of the Li + ions in a more severe manner than sphere-like particles, blocking the diffusion pathways.…”

Section: Introductionmentioning

confidence: 99%

Improved Lithium-Ion Transport Within the LiNi_0.8Co_0.15Al_0.05O₂ Secondary Cathode Particles Through a Template-Assisted Synthesis Route

Kopuklu

Gómez-Martín

Winter

et al. 2021

ACS Sustainable Chem. Eng.

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Herein, we report a sacrificial carbon fiber (CF) template-assisted synthesis of LiNi0.8Co0.15Al0.05O2 (C-NCA) by the Pechini method. An anisotropic primary particle morphology with an interconnected microstructure is obtained, originating from local overheating and oxygen-deficient zones induced by combustion of the CFs during high-temperature lithiation. Moreover, the particles assembled around the CFs demonstrated denser packing compared to the reference bare NCA (B-NCA) synthetized in the absence of the CF template. The anisotropic surfaces facilitate ion transport and stabilize the structure for high voltage and temperature operation. C-NCA||Li metal cells exhibit a reversible capacity of 106 mA h g–1 at 10 C and are able to retain 96% of their initial capacity as the C-rate is reverted to 0.1 C. The state of health of C-NCA||graphite full cells remains at 70% after 200 cycles at 0.33 C within 2.8–4.3 V. The results outperform the B-NCA cell, exhibiting a significant loss over 66 cycles while delivering only 50% of its initial capacity. The synthesis method allows for a straightforward route for tailoring the particle size, shape, and crystallinity, enabling the development of stable nickel-rich cathode materials, even at an upper cutoff voltage of 4.5 V or an operating temperature of 60 °C.

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Effects of polyvinyl alcohol on the electrochemical performance of LiNi0.8Co0.15Al0.05O2 cathode material

Cited by 8 publications

References 22 publications

Effects of Lithium Salt Addition Methods on the High-Temperature Electrochemical Performance of LiMn₂O₄

Effects of Lithium Salt Addition Methods on the High-Temperature Electrochemical Performance of LiMn₂O₄

Preparation of Spheroidal Spinel LiMn₂O₄ and Its High Temperature Performance

Improved Lithium-Ion Transport Within the LiNi_0.8Co_0.15Al_0.05O₂ Secondary Cathode Particles Through a Template-Assisted Synthesis Route

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Effects of polyvinyl alcohol on the electrochemical performance of LiNi0.8Co0.15Al0.05O2 cathode material

Cited by 8 publications

References 22 publications

Effects of Lithium Salt Addition Methods on the High-Temperature Electrochemical Performance of LiMn2O4

Effects of Lithium Salt Addition Methods on the High-Temperature Electrochemical Performance of LiMn2O4

Preparation of Spheroidal Spinel LiMn2O4 and Its High Temperature Performance

Improved Lithium-Ion Transport Within the LiNi0.8Co0.15Al0.05O2 Secondary Cathode Particles Through a Template-Assisted Synthesis Route

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Product

Resources

About

Effects of Lithium Salt Addition Methods on the High-Temperature Electrochemical Performance of LiMn₂O₄

Effects of Lithium Salt Addition Methods on the High-Temperature Electrochemical Performance of LiMn₂O₄

Preparation of Spheroidal Spinel LiMn₂O₄ and Its High Temperature Performance

Improved Lithium-Ion Transport Within the LiNi_0.8Co_0.15Al_0.05O₂ Secondary Cathode Particles Through a Template-Assisted Synthesis Route