Design and mechanism exploration of single-crystalline NCM811 materials with superior comprehensive performance for Li-ion batteries

Kong, Xiangbang; Yang, Huiya; Zhang, Yige; Dai, Pengpeng; Tang, Yonglin; Zeng, Jing; Zhao, Jinbao

doi:10.1016/j.cej.2022.139431

Cited by 30 publications

(15 citation statements)

References 49 publications

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“…In recent years, surface modification, element doping, and concentration gradient implementation have been the main methods used to solve these problems with Ni-rich NCM (i.e., LiNi 0.83 Co 0.11 Mn 0.06 O 2 (NCM83) − ) materials and enhance their electrochemical properties. − Actually, the surface coating forms a protective layer on the surface of the electrode material, which plays many positive effects. These include enhancing the ionic conductivity of the cathode material, fostering electron transfer, promoting lithium-ion diffusion dynamics, stabilizing the surface structure, and preventing direct contact between the cathode material and electrolyte.…”

Section: Introductionmentioning

confidence: 99%

Synergistic Strategy Using Doping and Polymeric Coating Enables High-Performance High-Nickel Layered Cathodes for Lithium-Ion Batteries

Chang

Yan

et al. 2023

J. Phys. Chem. C

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As one of the most promising cathode materials for lithium-ion batteries, nickel-rich layered oxide LiNi0.83Co0.11Mn0.06O2 (NCM83) has an inherent issue with rapid capacity decay caused by phase change and interface side reactions during the charge/discharge cycling. Herein, an effectively synergistic strategy for improving the structural stability and electrochemical performance of NCM83 cathodes has been proposed, combining surface polymeric coating with bulk doping by the high-temperature solid-phase method. The comprehensive results demonstrate that the niobium (Nb) element can be successfully bulk-doped into the crystal lattice, which could increase the layer spacing, thus stabilizing the crystal structure and minimizing the Li+/Ni2+ mixing in the as-prepared NCM83 cathode. Meanwhile, a small amount of Nb in the form of oxide and a layer of polyaniline (PANI) was coated on the NCM83 cathode’s surface. This not only can prevent electrolyte erosion and inhibit side reactions but also can effectively improve the transport coefficient of Li+ during the charge and discharge process. The optimized NCM83 cathode exhibited outstanding discharge-specific capacity (236.79 mAh g–1 at 0.2 C rate and 215.67 mAh g–1 at 2 C rate), stable cycling performance (capacity retention of 84.4% after 100 cycles at 2 C), and excellent rate performance (150.58 mAh g–1 at 10 C) by taking advantage of the synergistic effects. The synergistic strategy using Nb doping in combination with a surface polymeric coating can enhance the fundamental understanding of the high-nickel layered oxide cathodes for lithium-ion batteries.

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Section: Introductionmentioning

confidence: 99%

Synergistic Strategy Using Doping and Polymeric Coating Enables High-Performance High-Nickel Layered Cathodes for Lithium-Ion Batteries

Chang

Yan

et al. 2023

J. Phys. Chem. C

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“…Next, the precursor was thoroughly mixed with LiOH·H 2 O and Li 2 SO 4 ·H 2 O in a molar ratio of 1:1.05:0.1. The additional Li 2 SO 4 ·H 2 O was used to promote the growth of single crystals. , After that, the mixture was preliminarily heated to 500 °C for 5 h and subsequently heated to 800 °C held for 10 h in O 2 and then cooled to 300 °C at a rate of 2 °C/min. The obtained samples were cleaned ultrasonically in icy water (0 °C) to separate the water–soluble Li–salts and then collected by filtration, dried, and re-heated to 600 °C for 5 h in O 2 .…”

Section: Methodsmentioning

confidence: 99%

Controlled Synthesis of Single–Crystalline Ni–Rich Cathodes for High-Performance Lithium–Ion Batteries

Cao

Fang

et al. 2022

ACS Appl. Mater. Interfaces

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Single–crystalline LiNi0.8Co0.1Mn0.1O2 (NCM811) has been considered as one of the most promising cathode materials. It addresses the pulverization issue present in its polycrystalline counterpart by eliminating intergranular cracks. However, synthesis of high-performance single–crystalline NCM is still a challenge owing to the lower structure stability of NCM811 at high calcination temperatures (≥900 °C), which is often required to grow single crystals. Herein, we report a synthesis process for microsized single–crystalline NCM811 particles with exposed (010) facets on their lateral sides [named as SC–NCM(010)], which includes the preparation of a well–dispersed microblock-like Ni0.8Co0.1Mn0.1(OH)2 precursor through coprecipitation assisted with addition of PVP and Na2SiO3 and subsequent lithiation of the precursor at 800 °C. The SC–NCM(010) cathode exhibits an excellent capacity retention rate (91.6% after 200 cycles at 1 C, 4.3 V) and a high rate capability (152.2 mAh/g at 20 C, 4.4 V), much superior to those of polycrystalline NCM811 cathodes. However, despite the removal of interparticle boundaries, when cycled between 2.8 and 4.5 V, the SC–NCM(010) cathode still suffers from structural changes including lattice gliding and intragranular cracking. These structural changes are correlated with the interior structural inhomogeneity, which is evidenced by the coexistence of H2 and H3 phases in the fully deintercalated state.

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“…For bulk doping, introducing appropriate dopant elements with stronger metal–oxygen bond energy (e.g., Zr, W, Nb, Ti, Mg, etc.) can inhibit the migration of transition metals, preserving the crystal structural integrity. − For the surface modification, some appropriate surface coating layers (e.g., TiO 2 , Co x B, LiBO 3 , NiCo 2 O 4 , etc.) can act as physical buffered layers to isolate the occurrence of interfacial side reactions to a certain extent. ,− However, such protective coating layers have the limitations of introducing a new interface to inevitably increase surface resistance and disturb ionic transport.…”

Section: Introductionmentioning

confidence: 99%

Simple Synchronous Dual-Modification Strategy with Zr⁴⁺ Doping and CeO₂ Nanowelding to Stabilize Layered Ni-Rich Cathode Materials

Liu

Yin

Zheng

et al. 2023

ACS Appl. Energy Mater.

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A Ni-rich layered oxide, one promising cathode for lithium-ion batteries (LIBs), exhibits the advantages of low cost and high capacity but suffers from rapid capacity loss due to bulk structural instability and surface side reactions. Herein, a simple synchronous dual-modification strategy with Zr4+ doping and CeO2 nanowelding is proposed to address such issues. Utilizing the migration energy difference of Zr and Ce ions in layered structures, one-step high-temperature sintering of LiNi0.8Co0.1Mn0.1O2 particles with Zr and Ce nitrate distributions enables simultaneous doping of Zr ions in the bulk and CeO2 surface modification. Therein, Zr ions in the bulk occupying the Li sites can improve the Li+ diffusion rate and stabilize the crystal structure, while CeO2 on the surface provides nanowelding between the grain boundaries and resistance to electrolyte erosion. Theoretical calculations and a series of structure/composition characterizations (i.e., neutron scattering, in situ X-ray diffraction, etc.) validated the proposed strategy and its role in stabilizing the Ni-rich cathodes. The synergistic effect of Zr4+ doping and CeO2 nanowelding enables an impressive initial capacity of 187.2 mAh g–1 (2.7–4.3 V vs Li/Li+) with 86.1% retention after 200 cycles at 1 C and rate capabilities of 146.6 and 127.3 mAh g–1 at 5 and 10 C, respectively. Upon increasing the testing temperature to 60 °C, the dual-modified Ni-rich cathode exhibits an initial discharge capacity of 203.5 mAh g–1 with a good retention of 80.8% after 100 cycles at 0.5 C. The present strategy utilizing the migration energy difference of metal ions to achieve synchronous bulk doping and surface modification will offer fresh insights to stabilize layered cathode materials for LIBs, which can be widely used in other kinds of batteries with various cathode materials.

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Design and mechanism exploration of single-crystalline NCM811 materials with superior comprehensive performance for Li-ion batteries

Cited by 30 publications

References 49 publications

Synergistic Strategy Using Doping and Polymeric Coating Enables High-Performance High-Nickel Layered Cathodes for Lithium-Ion Batteries

Synergistic Strategy Using Doping and Polymeric Coating Enables High-Performance High-Nickel Layered Cathodes for Lithium-Ion Batteries

Controlled Synthesis of Single–Crystalline Ni–Rich Cathodes for High-Performance Lithium–Ion Batteries

Simple Synchronous Dual-Modification Strategy with Zr⁴⁺ Doping and CeO₂ Nanowelding to Stabilize Layered Ni-Rich Cathode Materials

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Design and mechanism exploration of single-crystalline NCM811 materials with superior comprehensive performance for Li-ion batteries

Cited by 30 publications

References 49 publications

Synergistic Strategy Using Doping and Polymeric Coating Enables High-Performance High-Nickel Layered Cathodes for Lithium-Ion Batteries

Synergistic Strategy Using Doping and Polymeric Coating Enables High-Performance High-Nickel Layered Cathodes for Lithium-Ion Batteries

Controlled Synthesis of Single–Crystalline Ni–Rich Cathodes for High-Performance Lithium–Ion Batteries

Simple Synchronous Dual-Modification Strategy with Zr4+ Doping and CeO2 Nanowelding to Stabilize Layered Ni-Rich Cathode Materials

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Simple Synchronous Dual-Modification Strategy with Zr⁴⁺ Doping and CeO₂ Nanowelding to Stabilize Layered Ni-Rich Cathode Materials