Studies on electrochemical reversibility of lithium tungstate coated Ni-rich LiNi0.8Co0.1Mn0.1O2 cathode material under high cut-off voltage cycling

Wu, Liping; Tang, Xincun; Rong, Zhuoxian; Chen, Xi; Huang, Jie; Chen, Tao; Xiong, Fei; Wang, Yang; Dang, Wei

doi:10.1016/j.apsusc.2019.04.098

Cited by 48 publications

(14 citation statements)

References 54 publications

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“…In Figure b, the electron binding energies of 854.0 and 872.1 eV relate to Ni 2p 3/2 and Ni 2p 1/2 of the NCM811 cathode material. Ni 2p 3/2 can be well fitted by two peaks at 853.5 and 855.2 eV, assigning to Ni 2+ and Ni 3+ , respectively. − Also, the detected peaks of Co 2p 3/2 , Co 2p 1/2 , and Ni (LMM) in Figure c are recorded at binding energies of 779.4, 782.7, and 795.1 eV, demonstrating that the Co ions in the crystal lattice are mainly trivalent. ,, Moreover, the electron binding energies of Mn 2p 3/2 and Mn 2p 1/2 appear at 641.8 and 653.4 eV (Figure d), indicating that the Mn ions are mainly presented as Mn 4+ . , It is noteworthy to mention that the similar binding energies of Ni, Co, and Mn XPS peaks of the pristine and TiO 2 -coated NCM cathodes indicate that the surface valence states and crystal structure of the active cathode material have not changed during the coating process. , Binding energies of Ti 2p 3/2 and Ti 2p 1/2 at 458.4 and 464.2 eV of the surface-modified cathode are associated with the Ti spectrum of TiO 2 NPs (Figure e) and show that the Ti element is tetravalent. , …”

Section: Resultsmentioning

confidence: 82%

Electrochemical Performance and Elevated Temperature Properties of the TiO₂-Coated Li[Ni_0.8Co_0.1Mn_0.1]O₂ Cathode Material for High-Safety Li-Ion Batteries

Khollari

Azar

Esmaeili

et al. 2021

ACS Appl. Energy Mater.

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Nowadays, the LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) cathode material has attracted great research interest due to its high energy density and less usage of costly raw materials. However, the high nickel content of NCM811 brings about an extremely unstable interface between the electrode and electrolyte and therefore inferior cyclic stability. Herein, we have proposed a straightforward method to deliver 1, 2, and 4 wt % of TiO 2 nanoparticles (NPs) on the surface of the NCM811 cathode material and to improve its properties at room and high temperatures. Based on scanning electron microscopy and transmission electron microscopy observations, the coating thickness varies from 10 to 35 nm and the 2 wt % TiO 2 -coated cathode is provided with uniformly distributed NPs that could result in an improved structural stability and electrochemical performance. In detail, at 25 and 55 °C and 1 C, the 2 wt % TiO 2 -coated cathode shows capacity retentions of 90.0 and 80.5% after 100 cycles, higher than those of pristine and coated cathodes. Under a high current rate of 10 C at 25 and 55 °C, the discharge capacities of the 2 wt % TiO 2 -coated cathode were 135.9 and 141.4 mA h g −1 , which are significantly higher than those of the pristine cathode material (128.3 and 89.1 mA h g −1 ). Results of the dissolution test at 55 °C reflect the effectiveness of the TiO 2 coating in maintaining the structural integrity of the cathode material and protecting it from HF attack and deleterious side reactions. Also, the differential scanning calorimetry result proves the enhanced safety after surface modification; the TiO 2 coating shifts the exothermic peak of the electrode from 231.1 to 242.9 °C. Therefore, surface modification with TiO 2 NPs can be proposed as a practical and cost-effective method for the commercial application of the high energy density NCM811 cathode at room and high temperatures. KEYWORDS: LiNi 0.8 Co 0.1 Mn 0.1 O 2 , nanocoating, TiO 2 , safety, cathode, lithium-ion batteries

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Section: Resultsmentioning

confidence: 82%

Electrochemical Performance and Elevated Temperature Properties of the TiO₂-Coated Li[Ni_0.8Co_0.1Mn_0.1]O₂ Cathode Material for High-Safety Li-Ion Batteries

Khollari

Azar

Esmaeili

et al. 2021

ACS Appl. Energy Mater.

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“…In Figure b, the Ni 2p 3/2 peak consists of two sets of peaks at 853.5 and 855.3 eV, assigned to Ni 2+ and Ni 3+ , respectively. Also, the observed peak of Ni 2p 1/2 appears at 872.2 eV. − Figure c displays the peak of Co 2p 3/2 at 779.5 eV, Ni (LMM) peak signal at 782.7 eV, and the peak of Co 2p 1/2 at 795.2 eV, showing that the Co ions are mainly presented as Co 3+ . ,, Figure d shows Mn 2p spectra with two main peaks at 641.8 (Mn 2p 3/2 ) and 653.4 eV (Mn 2p 1/2 ), illustrating that the Mn ions in the crystal lattice are mainly tetravalent. , The similar binding energies of Ni, Co, and Mn peaks of the coated and uncoated cathode materials suggest that the coating process has not influenced the crystal structure and surface valence states of the NCM811 cathode material. In Figure e, the binding energies of Zr 3d 5/2 and Zr 3d 3/2 at 181.7 and 184.2 eV, respectively, are related to the Zr valences in the ZrO 2 - and rGO–ZrO 2 -coated NCM cathodes.…”

Section: Resultsmentioning

confidence: 90%

“…Also, the observed peak of Ni 2p 1/2 appears at 872.2 eV. 34−36 34,36,37 Figure 3d shows Mn 2p spectra with two main peaks at 641.8 (Mn 2p 3/2 ) and 653.4 eV (Mn 2p 1/2 ), illustrating that the Mn ions in the crystal lattice are mainly tetravalent. 34,36 The similar binding energies of Ni, Co, and Mn peaks of the coated and uncoated cathode materials suggest that the coating process has not influenced the crystal structure and surface valence states of the NCM811 cathode material.…”

Section: Resultsmentioning

confidence: 94%

“…Figure a,c,e,g exhibits the Nyquist plots of the samples after first and one-hundredth cycles at 1C and 25 and 55 °C. Nyquist plots of all of the electrodes contain two semicircles, one of them at high frequencies attributed to the surface film ( R sf ), and the other one at the middle to high frequencies attributed to charge-transfer resistance ( R ct ), and an intercept in the low-frequency range (Warburg impedance) related to Li + ion diffusion. ,, Based on the proposed equivalent circuit in Figure a, all of the EIS parameters were determined and are represented in Table S2. The presence of the insulating ZrO 2 coating on the cathode surface increases the R ct and R sf values after the first cycle at 25 and 55 °C; however, after 100 cycles, the ZrO 2 -coated cathode shows a remarkably lower R ct and R sf compared to the pristine material.…”

Section: Resultsmentioning

confidence: 99%

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Enhanced Electrochemical Performance and Thermal Stability of ZrO₂- and rGO–ZrO₂-Coated Li[Ni_0.8Co_0.1Mn_0.1]O₂ Cathode Material for Li-Ion Batteries

Azar

Khollari

Esmaeili

et al. 2020

ACS Appl. Energy Mater.

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LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) has been considered as a promising cathode for Li-ion batteries (LIBs) due to its high electrochemical capacity and low cost; however, poor cycling stability is one of the main restricting factors in industrial applications of the NCM811 cathode material. Notably, the capacity fading and low structural stability of NCM811 are intensified at elevated temperatures. ZrO 2 -and composite rGO−ZrO 2 -coated NCM811 were fabricated by a facile wet chemical method and evaluated at 25 and 55 °C to overcome these impediments. The ZrO 2 coating provides superior cycling and thermal stability and perfectly protects the cathode active material from deleterious side reactions, and HF attacks by suppressing the direct contact of NCM811 particles and electrolytes. Despite these advantages, the discharge capacity of the ZrO 2 -coated cathode material (166.3, 187.7 mAh g −1 ) is slightly lower than that of the pristine cathode (171.7, 193.0 mAh g −1 ) due to the insulative nature of ZrO 2 NPs, after one cycle at ambient and elevated temperatures. The first cycle discharge capacity increased to 185.9 and 206.7 mAh g −1 at 25 and 55 °C, respectively, with the rGO−ZrO 2 -coated cathode material. The capacity retention reached 92.4 and 83.3%, showing high capacities of 171.8 and 172.3 mAh g −1 at 1C after 100 cycles at 25 and 55 °C, whereas the pristine cathode material exhibited low retention values of 72.4 and 54.5% with discharge capacities of 124.3 and 105.2 mAh g −1 under the same conditions, respectively. The incorporation of rGO into the coating can make up for the ZrO 2 coating imperfection and, at the same time, can enhance the ion/electron conductivity of the electrode by providing a conductive network on the surface of the cathode material. In light of the fact that ZrO 2 -and composite rGO−ZrO 2 -coated NCM811 cathode materials exhibit superior performance; they can pave the way for industrial applications of high-energy-density lithium-ion batteries. KEYWORDS: LiNi 0.8 Co 0.1 Mn 0.1 O 2 , nanocoating, reduced graphene oxide, ZrO 2 , thermal stability, lithium-ion batteries

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“…However, it should balance the relationships between the electrochemical performances of materials and the thickness of coating layers. A certain thickness of coating layer can improve the resistance of the materials to water [ 127‐128 ] , but excessive thickness of it would hinder the electrochemical performance and increase the whole cost of Ni‐rich materials.…”

Section: Applications Of Coating In Ni‐rich Materialsmentioning

confidence: 99%

Advances and Prospects of Surface Modification on Nickel‐Rich Materials for Lithium‐Ion Batteries^†

Chen

Lai

et al. 2020

Chin. J. Chem.

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Although layered Ni-rich cathode materials have attracted lots of attention for their high capacity and power density, several significant issues, such as poor thermal stability and moderate cyclability, limit their practical applications. Most of these undesired problems of Ni-rich materials are caused by the unstable surface or the parasitic reactions at cathode-electrolyte interface. Surface coating is the most common method to suppress such interfacial problems for Ni-rich materials. This review focuses on the surface engineering of the Ni-rich materials in recent years, including the species used in coating, synthetic strategies of uniform coating layer, and the positive effects of coating species on the active materials. Detailed discussions are also taken to describe the formation mechanism of the surface coating layer with design philosophy. Finally, the prospects for further developments and challenges in surface coating are also summarized. Yuefeng Su (left) is a professor in the School of Materials Science and Engineering at Beijing Institute of Technology (BIT). In 2013, he was awarded New Century Excellent Talents in University from the Chinese Ministry of Education. His research group mainly engaged in the research of green secondary batteries and advanced energy materials, including lithium-rich cathode materials, nickel-rich cathode materials and other high-power energy storage devices. As the principal investigator, Prof. Su successfully hosted the National Key Research and National Natural Science Foundation of China, etc. Gang Chen (middle) is currently a Ph.D. candidate under the supervision of Prof. Yuefeng Su in the School of Materials Science and Engineering at Beijing Institute of Technology. His major research includes the design and synthesis of Ni-rich cathode materials for high performance lithium ion batteries, especially for the interfacial design and its mechanism research of Ni-rich materials. Lai Chen (right) obtained his Ph.D. majoring in Environmental Engineering from Beijing Institute of Technology (BIT) in 2017, and is currently an associate professor at the school of Materials Science and Engineering at BIT. As the principal investigator, he has successfully hosted the

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Studies on electrochemical reversibility of lithium tungstate coated Ni-rich LiNi0.8Co0.1Mn0.1O2 cathode material under high cut-off voltage cycling

Cited by 48 publications

References 54 publications

Electrochemical Performance and Elevated Temperature Properties of the TiO₂-Coated Li[Ni_0.8Co_0.1Mn_0.1]O₂ Cathode Material for High-Safety Li-Ion Batteries

Electrochemical Performance and Elevated Temperature Properties of the TiO₂-Coated Li[Ni_0.8Co_0.1Mn_0.1]O₂ Cathode Material for High-Safety Li-Ion Batteries

Enhanced Electrochemical Performance and Thermal Stability of ZrO₂- and rGO–ZrO₂-Coated Li[Ni_0.8Co_0.1Mn_0.1]O₂ Cathode Material for Li-Ion Batteries

Advances and Prospects of Surface Modification on Nickel‐Rich Materials for Lithium‐Ion Batteries^†

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Studies on electrochemical reversibility of lithium tungstate coated Ni-rich LiNi0.8Co0.1Mn0.1O2 cathode material under high cut-off voltage cycling

Cited by 48 publications

References 54 publications

Electrochemical Performance and Elevated Temperature Properties of the TiO2-Coated Li[Ni0.8Co0.1Mn0.1]O2 Cathode Material for High-Safety Li-Ion Batteries

Electrochemical Performance and Elevated Temperature Properties of the TiO2-Coated Li[Ni0.8Co0.1Mn0.1]O2 Cathode Material for High-Safety Li-Ion Batteries

Enhanced Electrochemical Performance and Thermal Stability of ZrO2- and rGO–ZrO2-Coated Li[Ni0.8Co0.1Mn0.1]O2 Cathode Material for Li-Ion Batteries

Advances and Prospects of Surface Modification on Nickel‐Rich Materials for Lithium‐Ion Batteries†

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Product

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Electrochemical Performance and Elevated Temperature Properties of the TiO₂-Coated Li[Ni_0.8Co_0.1Mn_0.1]O₂ Cathode Material for High-Safety Li-Ion Batteries

Electrochemical Performance and Elevated Temperature Properties of the TiO₂-Coated Li[Ni_0.8Co_0.1Mn_0.1]O₂ Cathode Material for High-Safety Li-Ion Batteries

Enhanced Electrochemical Performance and Thermal Stability of ZrO₂- and rGO–ZrO₂-Coated Li[Ni_0.8Co_0.1Mn_0.1]O₂ Cathode Material for Li-Ion Batteries

Advances and Prospects of Surface Modification on Nickel‐Rich Materials for Lithium‐Ion Batteries^†