Improved electrochemical performance of Li(Ni0.6Co0.2Mn0.2)O2 at high charging cut-off voltage with Li1.4Al0.4Ti1.6(PO4)3 surface coating*

Wang, Yi; Liu, Bonan; Zhuang, G.; Nie, Kaihui; Zhang, Jie-Nan; Yu, Xiqian; Li, Hong

doi:10.1088/1674-1056/28/6/068202

Cited by 19 publications

(17 citation statements)

References 25 publications

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“…The details of the coating layer of HC-LCO are shown in Figure 2d. It could be seen that a uniform layer with a thickness of more than 20 nm covers the surface of HC-LCO, which is different from the morphology of Bare-LCO (with a clean and smooth surface as shown in 40,41 When considering the AZO and LAGP mixture as a solid electrolyte composite, the AZO oxides additive could be believed to enhance the Li-ion conductivity as well. It is reported that Al 2 O 3 adding into LiI or Li 2 ZnI 4 can enhance the interfacial Li-ion conductivity in the nanosized system, and finally the Li-ion conductivity can obtain an improvement with 3 or 4 orders of magnitudes.…”

Section: Resultsmentioning

confidence: 91%

“…The fast Fourier transformation (FFT) results of regions I and II also confirm the LAGP and AZO phases in the coating layer. During the mechanical fusion process, due to the high shear and compression forces, resulting from the high-speed rotation and pressing of the plunger chip, LAGP and AZO nanocrystals are successfully mixed and coated onto host LCO particles. , When considering the AZO and LAGP mixture as a solid electrolyte composite, the AZO oxides additive could be believed to enhance the Li-ion conductivity as well. It is reported that Al 2 O 3 adding into LiI or Li 2 ZnI 4 can enhance the interfacial Li-ion conductivity in the nanosized system, and finally the Li-ion conductivity can obtain an improvement with 3 or 4 orders of magnitudes. − In addition, the electronic conductivities of HC-LCO and Bare-LCO powders were measured and the results in Figure S6 show that the electronic conductivity of LCO powders is enhanced after LAGP-AZO comodification.…”

Section: Results and Discussionmentioning

confidence: 99%

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A Hybrid Ionic and Electronic Conductive Coating Layer for Enhanced Electrochemical Performance of 4.6 V LiCoO₂

Cheng

Qin

et al. 2021

ACS Appl. Mater. Interfaces

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The LiCoO2 cathode undergoes undesirable electrochemical performance when cycled with a high cut-off voltage (≥4.5 V versus Li/Li+). The unstable interface with poor kinetics is one of the main contributors to the performance failure. Hence, a hybrid Li-ion conductor (Li1.5Al0.5Ge1.5P3O12) and electron conductor (Al-doped ZnO) coating layer was built on the LiCoO2 surface. Characterization studies prove that a thick and conductive layer is homogeneously covered on LiCoO2 particles. The coating layer can not only enhance the interfacial ionic and electronic transport kinetics but also act as a protective layer to suppress the side reactions between the cathode and electrolyte. The modified LiCoO2 (HC-LCO) achieves an excellent cycling stability (77.1% capacity retention after 350 cycles at 1C) and rate capability (139.8 mAh g–1 at 10C) at 3.0–4.6 V. Investigations show that the protective layer can inhibit the particle cracks and Co dissolution and stabilize the cathode electrolyte interface (CEI). Furthermore, the irreversible phase transformation is still observed on the HC-LCO surface, indicating the phase transformation of the LiCoO2 surface may not be the main factor for fast performance failure. This work provides new insight of interfacial design for cathodes operating with a high cut-off voltage.

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Section: Resultsmentioning

confidence: 91%

Section: Results and Discussionmentioning

confidence: 99%

A Hybrid Ionic and Electronic Conductive Coating Layer for Enhanced Electrochemical Performance of 4.6 V LiCoO₂

Cheng

Qin

et al. 2021

ACS Appl. Mater. Interfaces

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“…The most significant difference between coating and water washing is that coating stabilizes the surface structure and makes the treated cathode have a strong resistance to H 2 O and CO 2 in the following storage process. [ 41,72 ] Besides, the production process of Ni‐rich cathode materials can be simplified because there is no washing and subsequent calcination process, which also reduces the cost and production time (Figure 6). Sung et al .…”

Section: Methods To Eliminate Residual Lithium Compoundsmentioning

confidence: 99%

“…[ 39 ] There are many literatures about the origins, influences, and modification methods of RLCs generated on Ni‐rich cathode materials’ surface. [ 40‐43 ] Therefore, we are committed to making a systematic explanation and solutions for the RLCs.…”

Section: Introductionmentioning

confidence: 99%

Strategies of Removing Residual Lithium Compounds on the Surface of Ni‐Rich Cathode Materials^†

Chen

et al. 2020

Chin. J. Chem.

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Ni-rich cathode materials have become one of the most promising cathode materials for advanced high-energy Li-ion batteries (LIBs) owing to their high specific capacity. However, Ni-rich cathode materials are sensitive to the trace H2O and CO2 in the air, and tend to react with them to generate LiOH and Li2CO3 at the particle surface region (named residual lithium compounds, labeled as RLCs). The RLCs will deteriorate the comprehensive performances of Ni-rich cathode materials and make trouble in the subsequent manufacturing process of electrode, including causing low initial coulombic efficiency and poor storage property, bringing about potential safety hazards, and gelatinizing the electrode slurry. Therefore, it is of considerable significance to remove the RLCs. Researchers have done a lot of work on the corresponding field, such as exploring the formation mechanism and elimination methods. This paper investigates the origin of the surface residual lithium compounds on Ni-rich cathode materials, analyzes their adverse effects on the performance and the subsequent electrode production process, and summarizes various kinds of feasible methods for removing the RLCs. Finally, we propose a new research direction of eliminating the lithium residuals after comparing and summing up the above. We hope this work can provide a reference for alleviating the adverse effects of residual lithium compounds for Ni-rich cathode materials' industrial production. Yuefeng Su (left) is a professor in 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 green secondary batteries and advanced energy materials, including lithium-rich cathode materials, nickel-rich cathode materials, and other high-power energy storage devices. Linwei Li (middle) is currently a graduate student under the supervision of Prof. Yuefeng Su in School of Materials Science and Engineering at Beijing Institute of Technology. Her research focuses on the synthesis and performance improvement of Ni-rich cathode materials for lithium-ion batteries. Gang Chen (right) is currently a Ph.D. candidate under the supervision of Prof. Yuefeng Su in 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.

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“…These ions tend to dissolve into the electrolyte, and this process accelerates the capacity fade of the battery. − The most effective approach for protecting the LNMO particles is to avoid their direct contact with the electrolyte. This could be achieved by covering their surface with a protective layer. − The coating of cathode materials with Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 (LATP) has been largely reported in the literature. − Generally, it is known that the conductivity of the Li 1+ x Al x Ti 2– x (PO 4 ) 3 materials is related to their composition and the maximum stability for the R 3̅ c structure, and enhanced conductivity was observed for x = 0.3 …”

mentioning

confidence: 99%

Instantaneous Surface Li₃PO₄ Coating and Al–Ti Doping and Their Effect on the Performance of LiNi_0.5Mn_1.5O₄ Cathode Materials

Mereacre

Bohn

Stüble

et al. 2021

ACS Appl. Energy Mater.

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Using hydrogen peroxide (H 2 O 2 ), a novel approach was applied for the synthesis of LiNi 0.5 Mn 1.5 O 4 (LNMO) coated with Li 3 PO 4 and doped with Al 3+ and Ti 4+ ions. The reaction between LNMO and H 2 O 2 resulted in particles with a partially damaged surface. If the same reaction is done in the presence of lithium, aluminum, titanium, and phosphate ingredients, then all particle facets are intact and show no sign of destruction. It appears that the H 2 O 2 decomposition activates the LNMO surface, generating perfect conditions for the homogeneous deposition of the Li, Al, Ti, and phosphate ions. Electrochemical investigations show a very slow fading process during the cycling, and even after more than 500 cycles, the obtained cathode material shows a high specific capacity of 127 mAh g −1 (at 1 C) (∼98% capacity retention) and an excellent Coulombic efficiency (99.5%).

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Improved electrochemical performance of Li(Ni_0.6Co_0.2Mn_0.2)O₂ at high charging cut-off voltage with Li_1.4Al_0.4Ti_1.6(PO₄)₃ surface coating*

Cited by 19 publications

References 25 publications

A Hybrid Ionic and Electronic Conductive Coating Layer for Enhanced Electrochemical Performance of 4.6 V LiCoO₂

A Hybrid Ionic and Electronic Conductive Coating Layer for Enhanced Electrochemical Performance of 4.6 V LiCoO₂

Strategies of Removing Residual Lithium Compounds on the Surface of Ni‐Rich Cathode Materials^†

Instantaneous Surface Li₃PO₄ Coating and Al–Ti Doping and Their Effect on the Performance of LiNi_0.5Mn_1.5O₄ Cathode Materials

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Improved electrochemical performance of Li(Ni0.6Co0.2Mn0.2)O2 at high charging cut-off voltage with Li1.4Al0.4Ti1.6(PO4)3 surface coating*

Cited by 19 publications

References 25 publications

A Hybrid Ionic and Electronic Conductive Coating Layer for Enhanced Electrochemical Performance of 4.6 V LiCoO2

A Hybrid Ionic and Electronic Conductive Coating Layer for Enhanced Electrochemical Performance of 4.6 V LiCoO2

Strategies of Removing Residual Lithium Compounds on the Surface of Ni‐Rich Cathode Materials†

Instantaneous Surface Li3PO4 Coating and Al–Ti Doping and Their Effect on the Performance of LiNi0.5Mn1.5O4 Cathode Materials

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Improved electrochemical performance of Li(Ni_0.6Co_0.2Mn_0.2)O₂ at high charging cut-off voltage with Li_1.4Al_0.4Ti_1.6(PO₄)₃ surface coating*

A Hybrid Ionic and Electronic Conductive Coating Layer for Enhanced Electrochemical Performance of 4.6 V LiCoO₂

A Hybrid Ionic and Electronic Conductive Coating Layer for Enhanced Electrochemical Performance of 4.6 V LiCoO₂

Strategies of Removing Residual Lithium Compounds on the Surface of Ni‐Rich Cathode Materials^†

Instantaneous Surface Li₃PO₄ Coating and Al–Ti Doping and Their Effect on the Performance of LiNi_0.5Mn_1.5O₄ Cathode Materials