APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Yunchao Liao,Na Wang,Xinyi Dai,Wenwen Zhou,Fuzhong Wu,Jiexi Wang,Haijun Chen,Yi Mai
Ultrahigh-nickel LiNi x Co y Mn 1-x-y O 2 cathode material (Ni content ≥ 0.9) is of great significance for the development of high energy density of lithium-ion batteries. However, its high surface activity leads to more surface residual lithium formation and deterioration of electrochemical performance, especially at high voltage. Here we add NH 4 F and nitrogen-doped carbon nanotubes (CNT) during the dimethyl carbonate (DMC) washing process, and constructed in situ the nano-LiF and CNT composite cathode electrolyte interphase (CEI) layer while removing part of residual lithium, effectively optimizing the surface environment of LiNi 0.9 Co 0.05 Mn 0.05 O 2 . The modified LiNi 0.9 Co 0.05 Mn 0.05 O 2 has a capacity retention rate of 61.3 % after 200 cycles between 2.8 and 4.5 V at 1C, significantly higher than the 46.7 % of the unwashed sample, and a specific discharge capacity of 146.9 mAh g −1 at 5C, compared to 127.5 mAh g −1 for the unwashed sample. Benefit from the alleviation of polarization and the increase of Li + diffusion coefficient, the stable CEI layer provides effective protection for LiNi 0.9 Co 0.05 Mn 0.05 O 2 under 4.5 V, alleviating surface side reactions. In this paper, a simple and effective strategy is developed to optimize the surface of Ni-rich cathode material, which provides a new insight for the treatment of surface residual lithium.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Wujie Ge,Yuanxiang Fu,Chaonan Wang,Lirong Yan,Qi Feng,Bing Yan,Xiang Li
The high-nickel cathode material LiNi 0.865 Co 0.095 Al 0.04 O 2 (NCA) has garnered significant attention due to its high energy density and cost-effectiveness in production. However, this material is also prone to rapid capacity degradation, primarily due to phase transitions occurring during the redox process. In this paper, the co-modification with Na and B cations is employed to stabilize the lattice structure and enhance the electrochemical performance of the NCA material. It can be found that the incorporation of Na and B cations in the lattice can reduce cation mixing, expand the Li-layer spacing and improve crystal stability, thereby increasing the specific capacity and cyclic stability of the NCA material. Specifically, the co-doped NCA-2 sample exhibits a specific capacity of 202.1 mAh/g at 0.1 C and maintains a capacity retention of 78.75 % at 1 C after 300 cycles, representing a substantial improvement over the pristine material (187.2 mAh/g and 61.68 % capacity retention). Moreover, at a current density of 10 C, the co-doped NCA-2 sample demonstrates a high specific capacity of 133.9 mAh/g, compared to 110.1 mAh/g for the pristine material. The Na/B co-doping strategy presented in this study offers a straightforward method to improve the cyclability and rate behavior of cathode materials, highlighting its potential for commercial applications.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Ruirui Zhao,Jiaxing Liang,Jiajun Huang,Ruiyu Zeng,Jiafeng Zhang,Hongyu Chen,Guang Shi
Al 2 O 3 and AlPO 4 single-coated and double-coated LiNi 0.5 Co 0.2 Mn 0.3 O 2 materials have been synthesized by a wet-coating method in this paper. XRD , XPS , SEM, TEM, DSC as well as electrochemical methods are employed to investigate the structure, surface properties, thermal stability as well as electrochemical properties . The obtained layers are homogenously coated on the particles and the coating thickness is around 20–30 nm, the surface compositions are analyzed by XPS in detail as well. Comparing with those single-coated or uncoated samples, the double-coated one exhibits more superior thermal stability as well as electrochemical properties. The possible reason is mainly due to the dense and uniform coating layer as well as the formation of Li 3 PO 4 and LiAlO 2 on the cathode surface. Based on these results, it seems that Al 2 O 3 and AlPO 4 double-coating is an efficient strategy in improving the properties of LiNi 0.5 Co 0.2 Mn 0.3 O 2 materials, which can be also applied to other Ni-rich layered materials.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yue Zou,Qizheng Zheng,Yonglin Tang,Yawen Yan,Shiyuan Zhou,Hong-Gang Liao,Yu Qiao,Jun Bao,Shi-Gang Sun
Increasing the nickel content in high-nickel LiNi x Co y Mn 1-x-y O 2 cathode materials (NCM) can boost their energy density. However, the consequence of rising Ni content in NCM consists in the heightened stress buildup, intensified irreversible phase transition and severe electrolyte decomposition, and consequently accelerating the battery’s degradation. In the current study, we have revealed that the 4-fluoro-N, N dimethylbenzenesulfonamide (FBSN) as an electrolyte additive can refrain the typical dehydrogenation of EC. Furthermore, a continuously repaired cathode electrolyte interphase (CEI) is designed elaborately on LiNi 0.9 Co 0.05 Mn 0.05 O 2 (NCM90) surface by employing the FBSN as a sustained-release electrolyte additive to enhance cycling stability of NCM90||Li cells. This CEI, composed of high mechanical strength LiF and benzene ring skeleton, along with conductive Li + moieties (S-rich and N-rich species), can be effectively self-repaired in time when damaged, reduce the interaction between the NCM90 and sensitive electrolyte, and mitigate the devastation to the NCM90 cathode surface. As a result, the NCM90||Li cells with 2 % FBSN-containing electrolyte delivers a capacity retention of 90.2 % after 200 cycles at 1C, and 83.1 % after 200 cycles even at higher voltage of 4.5 V, superior than that of Base electrolyte (70.0 % at 4.3 V and 68.0 % at 4.5 V). This study provides an engaging approach to design electrolytes for high-nickel cathodes by autonomously interfacial repair.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Song-Yi Liao,Shuai-Fu Cui,Yue-Zhu Li,Wei-Xiang Cheng,Xing-Wen Huang,Jing Zhang,Ting-Ting Cui,Xu-Gang Shu,Yong-Gang Min
In this work, the wrinkled, flexible, and layered nitrogen-doped Ti 3 C 2 T x (shorten as N-MXene) is synthesized by using cyanamide as N-dopants. The changeable (002) plane spacing and the attached functional groups of N-MXene are detected by XRD and XPS analyses in details, respectively. The microscopic morphology of N-MXene is characterized by SEM and TEM, which demonstrates its wrinkled and flexible characteristics. When the wrinkled N-MXene being added into the LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) as conductive additive, the attained electrodes obtain enhanced electrochemical performances at the appropriate weight ratio (namely 2.5-N-MXene with 2.5 wt.%). The 2.5-N-MXene delivers “extra” capacity of 226.9 mAh/g at 0.1 C (20 mA/g) current density. The “extra” capacity is assigned to Li ions intercalation/extraction from the wrinkled/flexible/layered N-MXene. Moreover, based on the analyses of CV and dQ/dV curves, the wrinkled/flexible N-MXene additive could effectively inhibit the phase transition of M↔H2 of NCM811 and alleviate the volume change of the particles in the circulation. From DFT simulation, the N-MXene is more capable of preventing Ni/Co/Mn from dissolving and migrating to the negative electrode to form dendrites through adsorption. Therefore, the N-MXene should be a very competitive conductive agent to improve the mechanical and electrochemical properties of high nickel cathode materials.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Energy Chemistry
·
2023
·
IF 13.1
Fengyu Zhang,Yunna Guo,Chenxi Li,Tiening Tan,Xuedong Zhang,Jun Zhao,Ping Qiu,Hongbing Zhang,Zhaoyu Rong,Dingding Zhu,Lei Deng,Zhangran Ye,Zhixuan Yu,Peng Jia,Xiang Liu,Jianyu Huang,Liqiang Zhang
Ni-rich layered oxides are one of the most promising cathode materials for Li-ion batteries due to their high energy density. However, the chemomechanical breakdown and capacity degradation associated with the anisotropic lattice evolution during lithiation/delithiation hinders its practical application. Herein, by utilizing the in situ environmental transmission electron microscopy (ETEM), we provide a real time nanoscale characterization of high temperature solid-state synthesis of LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) cathode, and unprecedentedly reveal the strain/stress formation and morphological evolution mechanism of primary/secondary particles, as well as their influence on electrochemical performance. We show that stress inhomogeneity during solid-state synthesis will lead to both primary/secondary particle pulverization and new grain boundary initiation, which are detrimental to cathode cycling stability and rate performance. Aiming to alleviate this multiscale strain during solid-state synthesis, we introduced a calcination scheme that effectively relieves the stress during the synthesis, thus mitigating the primary/secondary particle crack and the detrimental grain boundaries formation, which in turn improves the cathode structural integrity and Li-ion transport kinetics for long-life and high-rate electrochemical performance. This work remarkably advances the fundamental understanding on mechanochemical properties of transition metal oxide cathode with solid-state synthesis and provides a unified guide for optimization the Ni-rich oxide cathode.
研究领域:
材料科学
·
电化学
·
显微技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Jian Wei,Houfei Xiong,Hao Zhang,Xueting Li,Yanyi Liu,Zongmo Shi
The challenge of commercial layered-structure nickel-rich cathodes in lithium-ion batteries (LIBs) are the rapid capacity/voltage degradation at high rate capability and thermal runaway. The wide operational voltage range and excellent electrochemical stability of the coating material are key points to improve electrochemical performance and thermal stability at high voltage and high rate conditions. The uniformly olivine-type LiCoPO 4 (LCP) coatings were successfully prepared on the surface of LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) cathode combining sol–gel method and heat treatment. The capacity retention and operating voltage stability of the cathode at high cutoff voltage of 4.6 V were dramatically improved due to the ultrathin and stable interface is designed. The modified NCM811 exhibited a high cycling capacity of 157.7 mAh·g −1 at 5 C with a capacity loss of only 12.1 %. In high nickel cathode coating modification, LCP as the thinnest phosphate coating effectively improves the capacity decay of the cathode at high rate. The interface reconstruction provided a stable channel of Li + transport, which suppressed the cathode/electrolyte interface reaction to enhance the stability. The formation of strong covalent P O bonds at the interface significantly reduced the oxidizing activity on the NCM811 surface, further inhibiting the oxygen release and irreversible phase transition.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Xuan Wang,Shuo Huang,Benben Wei,Min Liu,Bo Yang,Ruoqing Liu,Hongyun Jin
All-solid-state batteries with oxide electrolytes and high-nickel layered oxide cathodes (LiNixCoyMnzO2 and LiNixCoyAlzO2, x + y + z = 1, x ≥ 60%) have received widespread attention owing to their high energy density and high safety. However, they generally suffer from interfacial structural instability when coupled with solid-state electrolytes, which strongly diminishes the longevity of the battery. In this work, we propose adding a sacrificial additive C60 to the catholyte buffer layer between Li1.4Al0.4Ti1.6(PO4)3 (LATP) and LiNi0.8Co0.1Mn0.1O2 (NCM811) to enhance the electrochemical stability under high-voltage operating conditions. A uniform and robust cathode–electrolyte interphase (CEI) film enriched with LixPOyFz, LiPxFy, and C60Fn is spontaneously formed on the surface of the cathode particles. In addition, the NCM811/Li solid-state battery delivers a discharge capacity of 150.3 mAh g–1 with a retention of 85% after 200 charge–discharge cycles at 0.5 C. This study offers a practical approach toward realizing LATP-based all-solid-state high-voltage batteries characterized by exceptional cycling stability.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Lucheng Li,Meiling Liu,Peng Yang,Wenfeng Yuan,Jun Chen
Broadening the charging and discharging voltage window of high nickel cathode material NCM811 is the most expected method to improve the high specific energy density of batteries currently, yet the cathode-electrolyte interface (CEI) formed by the oxidized and decomposed products of carbonate-based electrolyte under high voltage are always so unsatisfied. Therefore, a voltage-stabilizer, TPFPB (Tris(pentafluoro)phenylborane), added into baseline electrolyte (1 M LiPF 6 in EC:EMC:DMC=1:1:1 vol%) to promote the electrochemical performance of the battery at 4.5 V. The results interpret that the TPFPB-contained NCM811-Li half-cells exhibit high specific capacity (167.10 mAh/g), excellent capacity retention rate (CRR) (75.37 %), and high rate performance (173.3 mAh/g at 5C) during 4.5 V. Meanwhile, through the analysis of the physical characterization techniques. the B- and F-rich interfacial layer, named as CEI film, existing at the interface between the cathode and the electrolyte, produced under 4.5 V, is superior, resulting in impeding the structural collapse of the cathode material and the continued dissolution of transition metal ions (TM n + ) from the cathode material, as well as, ameliorate the electrochemical polarization of the battery, ultimately, it can stabilize the electrochemical performance of the battery under high voltage. Therein, the present work elucidate a new and substantial approach to enhance the high-voltage performances of rich-Ni cathode materials.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Zhenping Qiu,Zhiwen Wang,Shun Yuan,Chaojie Zhao
Cobalt-free, high-nickel cathode materials are essential for the sustainable evolution of energy storage technologies, reducing the dependence on resources with significant environmental and social implications and simultaneously improving the efficiency and cost effectiveness of batteries. This paper introduces a cobalt-free, high-nickel cathode material called 0.01B-LiNi 0.98 Mg 0.01 Zr 0.01 O 2 (NMZB) developed using a novel blend of elements to enhance mechanical and surface chemical stability. Detailed evaluations confirmed the successful integration of Mg, Zr, and B into the particles, with Mg and Zr primarily located within the particle interior and B predominantly on the surface. This unique elemental configuration significantly improves the stability of the bulk phase and surface structure of the material. In addition, the refinement of primary particles within NMZB further enhances its mechanical stability. As a result, NMZB exhibits exceptional electrochemical stability, achieving 90.5 % capacity retention after 200 cycles at a 1C rate. This compositional strategy incorporates a high nickel content into layered materials while eliminating cobalt, which is crucial for advancing the development of cost effective and high-performance lithium-ion battery technology.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials
·
2023
·Vol. 16
·期 8
·3079
·
IF 3.4
Lifan Wang,Qinling Shi,Chun Zhan,Guicheng Liu
Ni-rich cathodes are expected to serve as critical materials for high-energy lithium-ion batteries. Increasing the Ni content can effectively improve the energy density but usually leads to more complex synthesis conditions, thus limiting its development. In this work, a simple one-step solid-state process for synthesizing Ni-rich ternary cathode materials NCA (LiNi0.9Co0.05Al0.05O2) was presented, and the synthesis conditions were systematically studied. It was found that the synthesis conditions have a substantial impact on electrochemical performance. Furthermore, the cathode materials produced through a one-step solid-state process exhibited excellent cycling stability, maintaining 97.2% of their capacity after 100 cycles at a rate of 1 C. The results show that a one-step solid-state method can successfully synthesize Ni-rich ternary cathode material, which has great potential for application. Optimizing the synthesis conditions also provides valuable ideas for the commercial synthesis of Ni-rich cathode materials.Keywords:lithium-ion batteries;Ni-rich cathode materials;one-step solid-state synthesis;electrochemical performance
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
J. LUO,J.X. Liu,F.M. Xiao,L. Huang,W.C. Li,R.H. Tang,Q. Zhou,Y. Wang
In order to restrain the capacity decay of nickel-rich materials for lithium-ion batteries (LIBs) in advanced energy applications, a Ni-rich cathode (LiNi 0.88 Co 0.07 Al 0.05 O 2 , LANCA) with high-rate capability and cycle life was designed and prepared by coating γ-LiAlO 2 and doping Al 3+ on the surface and inside of the secondary particles, respectively. Specifically, the γ-LiAlO 2 -coated and Al 3+ -doped LANCA samples were synthesized by a simple strategy of pre-coating Ni 0.88 Co 0.07 Al 0.05 (OH) 2 , based on aluminum isopropoxide hydrolysis combined with a post-sintering lithiation process. With the γ-LiAlO 2 and Al 3+ , the capacity retention ratio of the cathode is tremendously improved from 61.7 to 83.6% at 1 C rate after 100 cycles. Even at a heavy current density of 10 C for the LANCA cathode, a high reversible capacity of 154.4 mA h g − 1 can be acquired, which amount to the 82.5% capacity retention at 0.2 C. Detailed morphology and structure observation shows that the side reaction at the electrolyte-cathode interface was suppressed, the structural degradation and intergranular cracking were suppressed, while the diffusion of Li + and conductivity were improved. Therefore, this ingenious structural design has certain reference significance for the development and commercialization of high-performance cathode materials for electric power.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机化学
·
固态化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）