Polymers
·
2020
·Vol. 12
·期 10
·2192
·
IF 3.426
Qiu-Shi Rao,Song-Yi Liao,Xing-Wen Huang,Yue-Zhu Li,Yi-Dong Liu,Yong-Gang Min
In this work, a few-layer MXene is prepared and sprinkled on a commercial polypropylene (PP) separator by a facile spraying method to enhance the electrochemistry of the Ni-rich LiNi0.8Co0.1Mn0.1O2(NCM811) cathode. Scanning electron microscope (SEM) and X-ray diffraction (XRD) are used to characterize the morphology and structure of MXene. Fourier transform infrared spectroscopy (FT-IR) and a contact angle tester are used to measure the bond structure and surface wettability PP and MXene/PP separator. The effect of the MXene/PP separator on the electrochemical performance of ternary NCM811 material is tested by an electrochemical workstation. The results show that the two-dimensional MXene material could improve the wettability of the separator to the electrolyte and greatly enhance the electrochemical properties of the NCM811 cathode. During 0.5 C current density cycling, the Li/NCM811 cell with MXene/PP separator remains at 166.2 mAh/g after the 100 cycles with ~90.7% retention. The Rctof MXene/PP cell is measured to be ~28.0 Ω. Combining all analyses results related to MXene/PP separator, the strategy by spraying the MXene on commercial PP is considered as a simple, convenient, and effective way to improve the electrochemical performance of the Ni-rich NCM811 cathode and it is expected to achieve large-scale in high-performance lithium-ion batteries in the near future.Keywords:polypropylene composite membrane;MXene;Ni-rich LiNi0.8Co0.1Mn0.1O2;electrochemical performance
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Xinru Tan,Maolin Zhang,Dongyan Zhang,Yangxi Yan,Yuan Wang,Zhimin Li
The formation of micro-cracks in Ni-rich LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) cathode particles is an extremely important factor affecting the electrochemical characteristics after long-term cycling. Generally, cracks can be divided into intergranular crack and intracrystalline crack according to their positions. Coating has been confirmed as a highly effective strategy to relieve intergranular cracks. However, the intracrystalline cracks of primary-like particles have rarely been studied. In this work, ethoxy functional polysiloxane (EPS) was directly coated on the surface of original NCM811 by tetraethyl orthosilicate (TEOS) hydrolytic polycondensation method without any additives. Then, the microstructure, micromorphology, surface state and electrochemical properties were investigated in detail by XRD , SEM, TEM, CV and EIS . The results displayed that the micro-cracks of primary-like particles were effectively suppressed under appropriate EPS coating. Accordingly, excellent capacity retention of 95.6% (100 cycles, 1C) and rate performance (144.6 mA h/g, 5C) were obtained. These improved mechanical and electrochemical properties are considered to be related to the EPS stress buffer layer , suppressed oxygen vacancies , inhibited phase transition and reduced volume change.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2024
·
IF 2.6
Zhou Xiaozheng,Chen Anqi,Lu Chengwei,Ma Ruojian,Fang Ruyi,Gan Yongping,Wang Guoguang,Xu Jianping,Mao Qinzhong,Lu Xiaoxiao,Xia Xinhui,Xia Yang
LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) cathode material is prized in the electric vehicles (EVs) industry for its high capacity and voltage during operation. However, the high residual alkali content and inferior ionic conductivity of Ni‑rich cathode materials are the intractable obstacles to the large-scale commercial application for a long time. Herein, a feasible Nb 2 O 5 coating strategy is proposed to eliminate residual alkali along with constructing high Li + conductive coating layer on NCM811 cathode materials surface. Impressively, 0.3% Nb 2 O 5 ‑coated NCM811 cathode exhibits superior rate capability (146.4 mA h g −1 @400 mA g −1 ) and remarkable rate cyclic stability (188.5 mA h g −1 after 100 cycles with capacity retention of 94.8%). On the one hand, a small quantity of Nb 2 O 5 coating on NCM811 surface can react with surface residual alkali to promote the transformation of low electronic conductivity surface residual alkali into the Li + conductor of LiNbO 3 coating layer, enhancing Li + de-intercalation kinetics and rate performance. On the other hand, excessive Nb 2 O 5 coating may introduce Nb 5+ into the lattice of NCM811, acting as pivotal components within the Li + layer, which effectively suppresses the H2 ↔ H3 phase transition, contributing to long-term cyclic stability. This work paves a new path for the rational design and facile coating of Ni-rich oxide cathode materials with reinforced structure stability and boosted rate capability in high‑energy‑density lithium-ion batteries.
研究领域:
材料科学
·
电化学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Changqi Wang,Yongjun Kang,Bingxue Liu,Daolei Lin,Guofeng Tian,Shengli Qi,Dezhen Wu
Polyimide (PI) is a promising binder material for lithium-ion batteries due to its excellent mechanical strength, high thermal stability, and outstanding chemical inertness. However, the high-temperature imidization requirement (>300 °C) of traditional PI binders is incompatible with current electrode preparation processes, severely limiting their practical applications. In this study, a low-temperature-imidized polyimide (∼150 °C) was elaborately designed and utilized as NCM811 cathode binder, which works by covalently bonding 5-aminobenzimidazole (ABZ) to the ends of the flexible 4,4′-oxidiphthalic anhydride (ODPA)/4,4′-oxidiphenylamine (ODA) poly(amic acid) (PAA) chains to realize the self-catalysis at a low temperature, followed by the assistance of dual-functional N,N′-carbonyldiimidazole (CDI) as a catalyst and dehydrating agent to accelerate the condensation and low-temperature dehydration of amic acid, yielding the imidization of the PAA precursor to give PI at 150 °C. Compared to the conventional PVDF binder, the cathode utilizing this low-temperature imidized polyimide (LTPI) binder exhibited excellent capacity retention (84.9% vs 81.7%) after 100 cycles at 0.2C, and superior rate performance (119.3 mAh·g–1 vs 95.7 mAh·g–1 at 5.0C) under a 4.3 V cutoff voltage. The CV, SEM, XRD, and XPS results demonstrate that the designed LTPI binder effectively suppresses the hexagonal (H2) to hexagonal (H3) phase transition and transition metal dissolution, maintaining the cathode’s structural integrity during charge–discharge cycles, thereby ensuring excellent long-term cycle stability. Furthermore, the NCM811 cathode with LTPI binder exhibits significantly enhanced flame-retardant performance compared with the NCM811/PVDF cathode in the combustion experiments, demonstrating the superiority of LTPI binders in improving the safety of the cathode materials. The NCM811/LTPI cathode retains the excellent structural and electrochemical stability of traditional high-temperature-imidized PI binders, providing a practical pathway to develop high-performance binder materials for high-safety and long-cycling lithium-ion batteries.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2021
·
IF 3.512
Mingyu Zhang,Chaoyong Wang,Junkai Zhang,Gang Li,Li Gu
LiNi0.8Co0.1Mn0.1O2 (NCM811) became a research hot point because of its low cost, environmental friendliness, and excellent electrochemical performance. However, Li+/Ni2+ intermixing is an essential factor affecting its applicability. Doping could be an important method to improve the electrochemical performance of NCM811-based cathode materials. In this work, La and Al co-doped NCM811 was prepared by a solid-state method. Results from X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive spectroscopy (EDS) and electrochemical performance were discussed in depth. These showed that when La and Al doping concentrations were 1 and 0.5%, the samples showed the best performance. The as-improved performances were mainly attributed to the reduced Li+/Ni2+ intermixing, suppressed phase transition, and decreased potential polarization and impedance.
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
Small
·
2024
·Vol. 20
·期 40
·2401204
·
IF 13
Siyu Fang,Chengyu Han,Shaojie Zhang,Yu Cao,Kang Ma,Yiming Zhang,Xinpeng Han,Juan Wang,Jie Sun
The demand for state-of-the-art high-energy-density lithium-ion batteries is increasing. However, the low specific capacity of electrode materials in conventional full-cell systems cannot meet the requirements. Ni-rich layered oxide cathodes such as Li(Ni 0.8 Co 0.1 Mn 0.1 )O 2 (NCM811) have a high theoretical specific capacity of 200 mAh g −1 , but it is always accompanied by side reactions on the electrode/electrolyte interface. Phosphorus anode possesses a high theoretical specific capacity of 2596 mAh g −1 , but it has a huge volume expansion (≈300%). Herein, a highly compatible and secure electrolyte is reported via introducing an additive with a narrow electrochemical window, Lithium difluoro(oxalato)borate (LiDFOB), into 1 m LiPF 6 EC/DMC with tris (2,2,2-trifluoroethyl) phosphate (TFEP) as a cosolvent. LiDFOB participates in the formation of organic/inorganic hybrid electrode/electrolyte interface layers at both the cathode and anode sides. The side reactions on the surface of the NCM811 cathode and the volume expansion of the phosphorus anode are effectively alleviated. The NCM811//RP full cell in this electrolyte shows high capacity retention of 82% after 150 cycles at a 0.5C rate. Meanwhile, the electrolyte shows non-flammability. This work highlights the importance of manipulating the electrode/electrolyte interface layers for the design of lithium-ion batteries with high energy density.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Shan Zhang,Ze Feng,Ranjusha Rajagopalan,Dan Sun,Chenghuan Huang,Yougen Tang,Qunxuan Yan,Yurong Ren,Haiyan Wang
Ni-rich layered cathodes have been regarded as one of the high-priority materials, but their commercial application was limited by the highly active surfaces, poor thermal stability, and irreversible phase transition. Furthermore, when they are stored in moist air, the particles can easily form an impurity layer of Li2CO3/LiOH. This inert substance hinders the transmission of lithium ions and electrons, leading to electrochemical performance deterioration. Herein, we report a simple method, namely, metaphosphate repair, which can successfully restore the degraded LiNi0.8Co0.1Mn0.1O2 (NCM811) cathode materials and form an in situ multifunctional hybrid repaired layer of Li3PO4-YPO4-Y(PO3)3 on the secondary particle. The repaired NCM811 delivers a discharge capacity of 171.7 mAh g–1 after 100 cycles, which is much higher than those of pristine (147.6 mAh g–1) and stored degraded (116.2 mAh g–1) samples. Moreover, the restored sample could deliver a capacity retention of 92.3% after 100 cycles at 1C along with a better initial Coulombic efficiency (CE) of 88.4%. This study provides a facile strategy to revive degraded Ni-rich cathode materials and other similar layered oxide cathodes for advanced batteries.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
Advanced Materials Interfaces
·
2023
·Vol. 10
·期 20
·2300254
·
IF 5.4
Lin Li,Yaojian Zhang,Naifang Hu,Kejian Wang,Yuehui Liu,Xiaogang Wang,Xinhong Zhou,Jun Ma,Guanglei Cui
The high energy density, low cost, and low toxicity of LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) cathodes has led to their large-scale mass production. However, the poor interfacial stability between NCM811 and organic electrolytes impairs the long-cycle performance of lithium ions batteries. In this study, carbonized polymer dots (CPDs) are successfully introduced onto the surface of NCM811 (NCM811@CPDs) via a simple physical mixing process. CPDs with rich surface oxygen functional groups form strong covalent bonds with transition metal (TM) ions at the NCM811 surface, distinctly restraining surface structure degradation, and transition metal ion dissolution. Furthermore, CPDs facilitate the formation of a compact and steady cathode electrolyte interface (CEI) layer during electrochemical cycling. As a result, the NCM811@1 wt% CPDs exhibit enhanced cycling performance with a capacity retention of 89.77% after 100 cycles at 0.5 C compared to 55.39% of the bare NCM811. This facile and effective surface decoration strategy provides valuable guidance for improving the stability and cycling performance of Ni-rich cathodes.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
ChemSusChem
·
2024
·
IF 7.5
Ling Huang,Miaolan Sun,Yuxiang Xie,Huayu Huang,Yixin Huang,Hui Chen,Shishi Liu,Peng Dai,Rui Huang,Shigang Sun
Li||LiNi0.8Co0.1Mn0.1O2 batteries,which consist of lithium metal anode (LMA) matched with NCM811 cathode, have an energy density more than twice that of lithium ion battery (LIB). However, the unstable electrode/electrolyte interface still hinders its practical application.Ether electrolytes show promise in improving the stability of LMA and NCM811 cathodes.However, a robust and stable electrode/electrolyte interface in Li||NCM811 batteries cannot be easily and efficiently achieved with most of the ether electrolytes reported in present studies. Herein, we present a straightforward and efficient tri-anion synergistic strategy to overcome this bottleneck. The addition of ClO4− and NO3− anions to LiFSI-based ether electrolytes forms a unique solvation structure with tri-anion (FSI−/ClO4−/NO3−) participation (LB511).This structure not only enhances the electrochemical window of the ether electrolytes but also achieves a stable Li||NCM811 batteries interface.The interaction between electrode and electrolyte is suppressed and an inorganic-rich (LiF/Li3N/LiCl) SEI/CEI layer is formed. Meanwhile, the coordination structure in the LB511 electrolyte increases the overpotential for Li deposition, resulting in a uniform and dense layer of deposition.Therefore, the Li||Cu cells using the LB511 electrolyte have an average CE of 99.6%.The Li||NCM811 batteries was cycled stably for 250 cycles with a capacity retention of 81% in the LB511 electrolyte (N/P = 2.5, 0.5 C).
研究领域:
电化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
IONICS
·
2025
·
IF 2.6
Wang Yuhang,Ren Zhiqi,Sun Jiaxiu,Li Xinze,Huang Bin,Yang Jianwen
In this work, the effect of potassium permanganate (KMnO 4 ) pre-oxidation treatment on the electrochemical properties of LiNi 0.83 Co 0.11 Mn 0.06 O 2 (NCM811) cathode materials was investigated. X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) tests revealed that the pre-oxidation treatment promoted the oxidation of Ni 2+ to Ni 3+ and the formation of a stable Mn-rich surface. Electrochemical testing showed that the electrochemical performance of the NCM811 material pre-oxidized with an appropriate amount of KMnO 4 (811–3) was significantly improved at both ambient (25 ℃) and elevated temperatures (55 ℃) compared to the untreated sample. Additionally, the air stability of 811–3 was enhanced. Specifically, the pre-oxidation treatment increased the oxidation state of nickel, minimized side reactions with CO 2 and moisture in the air, and improved cycling stability, rate performance, and lithium-ion diffusion. It also resulted in a lower self-discharge rate, ensuring better long-term voltage retention. These results indicated that KMnO 4 pre-oxidation is an effective strategy for improving the electrochemical performance of NCM811 and has the potential for application to other Ni-rich cathode materials.
研究领域:
材料科学
·
电化学
·
表面工程
·
储能技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Qi Li,Xiaoyu Zhang,Jian Peng,Zhihao Wang,Zhixiang Rao,Yuyu Li,Zhen Li,Chun Fang,Jiantao Han,Yunhui Huang
Poly(ethylene oxide) (PEO)-based polymer electrolytes have been widely studied as a result of their flexibility, excellent interface contact, and high compatibility with a lithium metal anode. Owing to the poor oxidation resistance of ethers, however, the PEO-based electrolytes are only compatible with low-voltage cathodes, which limits their energy density. Here, a high-voltage stable solid-state interface layer based on polyfluoroalkyl acrylate was constructed via in situ solvent-free bulk electropolymerization between the LiNi0.8Mn0.1Co0.1O2 (NCM811) cathode and the PEO-based solid polymer electrolyte. The electrochemical oxidation window of the as-synthesized electrolyte was therefore expanded from 4.3 V for the PEO-based matrix electrolyte to 5.1 V, and the ionic conductivity was improved to 1.02 × 10–4 S cm–1 at ambient temperature and 4.72 × 10–4 S cm–1 at 60 °C as a result of the improved Li+ migration. This fabrication process for the interface buffer layer by an in situ electrochemical process provides an innovative and universal interface engineering strategy for high-performance and high-energy-density solid-state batteries, which has not been explicitly discussed before, paving the way toward the large-scale production of the next generation of solid-state lithium batteries.
研究领域:
材料科学
·
电化学
·
能源存储
·
固态离子学
·
电池技术
·
高分子化学
·
界面科学
✓ 已验证
DOI
高影响因子
MATERIALS LETTERS
·
2025
·
IF 2.7
Caili He,Jinying Guo,Zhen Guo,Mengqi Ding,Hao Tang,Renjie Wang,Meifang Zhang
Layered oxide LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) is one of the promising cathode materials for high energy lithium ion batteries , which offering enhanced energy density and battery capacity. However, as the reaction progresses, a series of adverse effects arises. In this paper, the dual-additive electrolyte synergistic effect are ingeniously introduced to the traditional electrolyte LiPF 6 to form a low impedance and stable cathode electrolyte interface on the cathode surface. The specific discharge capacity of the battery at 5C was 154 mAh g −1 , while of the base electrolyte was only 106 mAh g −1 . The battery demonstrated over 82 % capacity retention after 200 cycles at 1C, while the base electrolyte was only 62 %.
研究领域:
电化学
·
材料科学
·
能源存储
·
锂离子电池
·
电极界面
·
电解液工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）