Novel concentration gradient LiNi0.815Co0.15Al0.035O2 microspheres as cathode material for lithium ion batteries

Hou, Aolin; Liu, Yanxia; Ma, Libin; Zhang, Ling; Li, Jingjing; Zhang, Pengfei; Chai, Fengtao; Ren, Baozeng

doi:10.1016/j.ceramint.2019.06.196

Cited by 24 publications

(9 citation statements)

References 40 publications

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“…In the Aq-LNCM83@CPPO sample, the peaks of Ce and P can be clearly observed at around 900 and 134 eV, , respectively. The splitting peaks of Ni 2p orbitals at positions greater than 855 eV and positions less than 855 eV correspond to trivalent nickel and divalent nickel, respectively . The detailed spectras of Ni 2p orbitals shown in Figure d,e,f show that the P-LNCM83 sample has the highest surface divalent nickel content (34.31%), followed by W-LNCM83 (33.19%), and Aq-LNCM83@CPPO the least (30.52%), which somewhat has a corresponding relationship to the cation mixing degree shown in the XRD refinement results.…”

Section: Resultsmentioning

confidence: 91%

Enhancing the Structure and Interface Stability of LiNi_0.83Co_0.12Mn_0.05O₂ Cathode Material for Li-Ion Batteries via Facile CeP₂O₇ Coating

Peng

Huang

Wang

et al. 2022

ACS Sustainable Chem. Eng.

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High-energy Ni-rich layered cathode materials (LiNi x Co y Mn 1−x−y O 2 , x ≥ 0.8) for lithium-ion batteries (LIBs) suffer greatly from cation disorder and poor thermal, structure, and interface stability, causing an unsatisfactory cycle and safety performance. Herein, cerium pyrophosphate (CeP 2 O 7 , abbreviated as CPPO) was coated on the secondary particle surface of LiNi 0.83 Co 0.12 Mn 0.05 O 2 via a facile PEG assisted aqueous deposition method. Compared with the bare material, lower cation disorder occurs in the modified sample due to lower Ni 2+ content. A wellordered CPPO crystalline coating layer could be observed on the particle surface. Suppressed structural deterioration due to more stable interface properties leads to better rate capability. Also, better thermal stability has been achieved after the surface treatment. The modified sample maintains 92.38% of the initial capacity after 100 cycles at a 2C rate and upper cutoff voltage of 4.3 V. After cycling for 200 cycles at a 1C rate and higher cutoff voltage of 4.4 V, 80.54% of the initial capacity is maintained. In addition, the discharge capacity under a higher rate is greatly improved under the upper cutoff voltage of 4.3/4.5 V.

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Section: Resultsmentioning

confidence: 91%

Enhancing the Structure and Interface Stability of LiNi_0.83Co_0.12Mn_0.05O₂ Cathode Material for Li-Ion Batteries via Facile CeP₂O₇ Coating

Peng

Huang

Wang

et al. 2022

ACS Sustainable Chem. Eng.

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“…Figure a,b displays the GITT curves of the bare NCMA and L1-NCMA, respectively. The cells were charged repetitively at 0.1C for 10 min between 30 min rest intervals until the voltage reached 4.3 V. The values of D Li + were determined by applying eq , based on Fick’s second law of diffusion and relevant assumptions and simplifications. − As displayed in Figure c, the calculated values of D Li + were between 10 –9 and 10 –10 cm 2 s –1 , except at the beginning and end; the values for L1-NCMA were slightly higher than those of the bare NCMA, suggesting that the coating layer acted as an artificial CEI layer that enhanced Li + ion diffusion along the surface of the NCMA particles, further improving the performance, especially at higher current densities. The obtained Li + diffusion coefficient values are compared with values reported in the literature in Table .…”

Section: Resultsmentioning

confidence: 99%

Surface-Modified Quaternary Layered Ni-Rich Cathode Materials by Li₂ZrO₃ for Improved Electrochemical Performance for High-Power Li-Ion Batteries

Jeyakumar

et al. 2022

ACS Appl. Energy Mater.

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Quaternary Ni-rich layered cathodes are one of the most intriguing yet challenging next-generation cathode materials, and their high Ni content has made it difficult to obtain long-term cyclability. In this paper, we report the improved electrochemical performance of high-power long-life Ni-rich layered cathode materials (LiNi 0.90 Co 0.04 Mn 0.03 Al 0.03 O 2 , denoted NCMA), synthesized in a Couette−Taylor reactor, after depositing a homogeneous surface coating of Li 2 ZrO 3 (LZO). Morphological analyses revealed that the thickness of the LZO coating was approximately 2.5 nm and spread uniformly on the NCMA surface. X-ray photoelectron spectroscopy indicated that the content of Li residues on the surface had greatly decreased after coating with LZO. The electrochemical performance of the coated samples was greater than that of the bare NCMA; in particular, the 1 wt % LZOcoated cathode material had a capacity retention of 90.2% after 100 cycles at 1C (vs 74.6% for the bare NCMA). Electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and the galvanostatic intermittent titration technique (GITT) indicated that the coating agent acted as a bridge that lowered the activation energy and polarization potential for a better Li + ion transport. The polarization potential also decreased significantly after coating with LZO, leading to improved electrochemical kinetics. Postmortem studies after long cycling confirmed that the LZO coating layer enhanced the structural stability of the cathode.

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“…To further prove that the designed 3D ion transport channels of MRPG/CNT is conducive to ion transport, the galvanostatic intermittent titration technique (GITT) was used to calculate the chemical diffusion coefficients of Li + , and the formula is shown as follows: − Here, D Li + (cm 2 s –1 ) represents the chemical diffusion coefficient of Li + ions; τ (s) is the duration of the current pulse; n m (mol) is the molar number of electrode material; ν m (cm 3 mol –1 ) represents the molar volume of electrode material; s (cm 2 ) is the chemical reaction area; Δ E s is the change of balance potential after applying the pulse current; Δ E t is the change of potential caused by the pulse currents. Figure e provides the graphical presentation of Δ E s and Δ E t .…”

Section: Results and Discussionmentioning

confidence: 99%

Facile Synthesis of Graphene with Fast Ion/Electron Channels for High-Performance Symmetric Lithium-Ion Capacitors

Xiao

Liu

et al. 2021

ACS Appl. Mater. Interfaces

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With the battery-type anode and capacitor-type cathode, lithium-ion capacitors (LICs) are expected to exhibit both high energy and high power density but suffer from the mismatch of the electrode reaction kinetics and capacity. Herein, to alleviate the mismatch between the two electrodes and synergistically enhance the energy/power density, we design a method of microwave irradiation reduction to prepare graphene-based electrode material (MRPG/CNT) with fast ion/electron pathway. The threedimensional structure of CNT intercalation to graphene inhibits the restacking of graphene sheets and improves the conductivity of the electrode material, resulting a rapid ion and electron diffusion channel. Due to its specific properties, MRPG/CNT materials can be used as both anode and cathode electrodes of LICs at the same time. As anode, MRPG/CNT shows a high capacity of 1200 mAh g −1 as well as high rate performance. As cathode, MRPG/CNT displays a high capacity of 108 mAh g −1 and the capacity retention of 100% after 8000 cycles. Coupling the prelithiated MRPG/CNT anode with MRPG/CNT cathode gives a full-graphene-based symmetric LIC, which achieves a high energy density of 232.6 Wh kg −1 at 226.0 W kg −1 , 111.2 Wh kg −1 at the ultrahigh power density of 45.2 kW kg −1 , and superior capacity retention of 86% after 5000 cycles. The structure design of this electrode provides a new strategy for alleviating the mismatch of LIC electrodes and constructing high-performance symmetrical LICs.

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Novel concentration gradient LiNi0.815Co0.15Al0.035O2 microspheres as cathode material for lithium ion batteries

Cited by 24 publications

References 40 publications

Enhancing the Structure and Interface Stability of LiNi_0.83Co_0.12Mn_0.05O₂ Cathode Material for Li-Ion Batteries via Facile CeP₂O₇ Coating

Enhancing the Structure and Interface Stability of LiNi_0.83Co_0.12Mn_0.05O₂ Cathode Material for Li-Ion Batteries via Facile CeP₂O₇ Coating

Surface-Modified Quaternary Layered Ni-Rich Cathode Materials by Li₂ZrO₃ for Improved Electrochemical Performance for High-Power Li-Ion Batteries

Facile Synthesis of Graphene with Fast Ion/Electron Channels for High-Performance Symmetric Lithium-Ion Capacitors

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Novel concentration gradient LiNi0.815Co0.15Al0.035O2 microspheres as cathode material for lithium ion batteries

Cited by 24 publications

References 40 publications

Enhancing the Structure and Interface Stability of LiNi0.83Co0.12Mn0.05O2 Cathode Material for Li-Ion Batteries via Facile CeP2O7 Coating

Enhancing the Structure and Interface Stability of LiNi0.83Co0.12Mn0.05O2 Cathode Material for Li-Ion Batteries via Facile CeP2O7 Coating

Surface-Modified Quaternary Layered Ni-Rich Cathode Materials by Li2ZrO3 for Improved Electrochemical Performance for High-Power Li-Ion Batteries

Facile Synthesis of Graphene with Fast Ion/Electron Channels for High-Performance Symmetric Lithium-Ion Capacitors

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Product

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Enhancing the Structure and Interface Stability of LiNi_0.83Co_0.12Mn_0.05O₂ Cathode Material for Li-Ion Batteries via Facile CeP₂O₇ Coating

Enhancing the Structure and Interface Stability of LiNi_0.83Co_0.12Mn_0.05O₂ Cathode Material for Li-Ion Batteries via Facile CeP₂O₇ Coating

Surface-Modified Quaternary Layered Ni-Rich Cathode Materials by Li₂ZrO₃ for Improved Electrochemical Performance for High-Power Li-Ion Batteries