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
Materials Express
·
2019
·Vol. 9
·期 8
·895-905
·
IF 1.465
Yu Juan,Huang Wenlong,Meng Bicheng,Wang Lejie,Zhao Junkai,Li Linbo,Du Xiaoqing,Fang Zhao
Sodium ions have been successfully doped into LiNi0.8Co0.1Mn0.1O2 (NCM811) by solid phase method. The influences of Na doping on the electrochemical properties of the electrode at high current intensities were studied. The experimental results
show that 3% Na modified LiNi0.8Co0.1Mn0.1O2 has superior rate performance and cycling behavior due to the cation mixing is suppressed and the structural stability is enhanced by Na doping. The capacity retention of Li0.97Na0.03Ni0.8Co0.1Mn0.1O2
is 64.33% after 100th cycles at 10 C (1 C = 200 mA · g–1) in the potential range from 2.8 V to 4.3 V, which is greatly higher than the pristine NCM (only 35.01%). Li0.97Na0.03Ni0.8Co0.1Mn0.1O2 also shows
excellent rate performance of 140.5 mAh · g–1 at 10 C, and the discharge capacity of 3% Na-NCM is higher than that of the pristine NCM when the current intensity is returned from 10 C to 0.5 C. The analysis of the cyclic voltammetry (CV) and electrochemical impedance
spectroscopy (EIS) measurements confirm that the Na doping plays an important role in inhibiting the electrochemical polarization of LiNi0.8Co0.1Mn0.1O2 and improving the diffusion of lithium ions.
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
·
2021
·
IF 5.316
Yike Xiong,Shenghong Chang,Yunjiao Li,Junchao Zheng,Xugang Ren,Zhouliang Tan,Xiaoming Xi,Jiachao Yang,Shuaiwei Liu,Shan Wang
YPO 4 modified Ni-rich cathode materials LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) are favourably synthesized via a traditional high temperature solid-state method. Herein, the structure as well as thermal stability are promoted through the synergistic effect of Y 3+ doping and LiYO 2 - Li 3 PO 4 dual surface modification. The results turn out to solve the lattice structure defects, Li + migration issue and, most of all, residual lithium issue. The most effective sample exhibits extraordinary 96.35% capacity retention with the initial specific discharge capacity of 186.1 mAh g −1 at 4.4 V cut-off voltage, 1 C, 25 ℃ after 100 cycles. Moreover, after 0.5, 1, 2, 4, 8 C cycling periods, at the time when the rate back to 0.5 C, the capacity of the YPO 4 modified samples remain almost the same as the first 0.5 C cycles. It obviously can be seen that the YPO 4 modification in this work is no doubt a promising strategy to optimize the manufacturing of cathode materials in Li-ion batteries field.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
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
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
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Dengke Zhang,Yan Liu,Lei Wu,Liwei Feng,Shuangling Jin,Rui Zhang,Minglin Jin
The effects of various Ti concentrations doping on the electrochemical properties of LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM 811) sample were systematically studied. The XRD , EDS and XPS analyses indicated that the Ti-ion was substituted the occupied sites of Li and transition metal on the crystal structure. It also led to the increase of lithium interlayer spacing and the decrease of transition metal interlayer slab. The secondary particle size distribution of the 0.005 mol Ti-doped in LiNi 0.8 Co 0.1 Mn 0.1 O 2 approximated to normal distribution . It showed multi-layer performance with high capacity (214.9 mAh g −1 at 0.1C), good rate performance (165.02 mAh g −1 at 1 C, 136.9 mAh g −1 at 5 C) and more excellent cyclic stability (77.01% after 150 t h at 1 C and 86.54% after 50 t h at 5 C). TEM studies revealed that the structural degradation on NCM 811 primary nano-particle could be effectively suppressed by the effect of Ti ions doped. The results demonstrated that doping of Ti content had superior advantages for LiNi 0.8 Co 0.1 Mn 0.1 O 2 cathodes.
研究领域:
材料科学
·
电化学
·
储能
✓ 已验证
DOI
高影响因子
Journal of Energy Chemistry
·
2021
·
IF 9.676
Chen Liang,Lihua Jiang,Zesen Wei,Wenhua Zhang,Qingsong Wang,Jinhua Sun
By virtue of the crucial effect of the crystal structure and transition metal (TM) redox evolution on the performance of LiNi x Co y Mn z O 2 (NCM) cathode, systematical investigation is carried out to better understand the charge mechanism upon deep charging. Based on the results of X-ray diffraction and high-resolution transmission electron microscope, phase transformations existing on particle surface are promoted by high potential because of the deeper lithium vacancies, accompanied by more substantial structure instability. Soft X-ray absorption spectroscopy indicates that Ni acts as the major contributor to charge compensation while Co displays a remarkable redox activity over the deep charge range. The elevated integrated intensity of pre-edge in O K -edge spectra reveals the extensive amount of holes formed in O 2 p orbitals and the enhanced hybridization of TM 3 d - O 2 p orbitals. Considering the close relationship between thermal behavior and structural evolution, the tendency of phase transitions and O 2 release upon heating is accelerated by voltage rise, demonstrating the aggravated instability due to deeper Li utilization. Remaining Li contents in NCM are employed to estimate the amount of oxygen released in structural transformation and its detrimental effect on stability declares Li content-dependent characteristics. Furthermore, the extended Li vacancies, higher proportion of Ni 4+ and stronger orbital hybridization are considered as three factors impeding the thermal stability of the highly-delithiated NCM.
研究领域:
材料科学
·
电化学
·
储能技术
·
锂离子电池
·
固态化学
✓ 已验证
DOI
高影响因子
IONICS
·
2023
·Vol. 29
·期 5
·1711-1720
·
IF 2.8
Zhu Min-dan,Zhu Hua-li,Guo Jin-mei,Lu Chao-cao,Ji Yan,Hu Jin,Tan Xin-xin,Chen Zhao-yong
High-nickel cathode material has high specific capacity, but the rapid capacity decay restricts its application. Hereby, three conductive oxides including nano-antimony tin oxide (Sb 2 SnO 5 , ATO), zinc stannate (Zn 2 SnO 4 , ZTO), and antimony-doped zinc stannate (Sb-doped ZTO, AZTO) with high mobility and low resistivity were used as coating materials separately to improve the rate capability and cycling stability of LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811). The conductive oxide was uniformly coated on the surface of NCM811 with the thickness of about 4 nm. The AZTO-coated NCM811 shows the superior rate capability with the initial discharge capacities of 201.35, 197.86, 190.80, and 182.31 mAh g −1 at 0.1, 0.2, 0.5, and 1 C, respectively. The ZTO-coated NCM811 has the best cycling stability with the capacity retention of 85.93% after 100 cycles, while that of the pristine NCM811 is 66.75%. The conductive oxides improve the electronic/ionic conductivity and block the reaction between cathode material and electrolyte, reduce the electrochemical impedance and the side reaction, and further increase the rate capability and the reversibility of the materials.
研究领域:
材料科学
·
电化学
·
储能技术
·
锂离子电池
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 19
·18200-18210
·
IF 2.195
Dong Jian,He HuiHui,Zhang Dongyun,Chang Chengkang
Boron-modified Li(Ni 0.8 Co 0.1 Mn 0.1 ) 1−x B x O 2 cathode materials(NCM811) were successfully prepared by a nano-milling assisted solid-state approach. X-ray diffraction investigations showed that the materials are solid solutions with a layered structure. SEM observations implied that the doped B ions promoted the growth of the target crystal with well-developed facets since it will form liquid phase at lower temperature. The intensity ratio of I(003)/I(104) raised with the increase in Boron doping concentration, until a maximum value of 1.453 was observed at x = 0.01. Further Rietveld refinements revealed that boron ions occupy the crystal lattice in the transition metal slab which helps to promote the lattice ordering by decreasing the Li/Ni ionic mixing. Such B promoted NCM811 cathode materials were confirmed to have an improved diffusion coefficient with a reduced interfacial resistance by subsequent CV and EIS measurements. From the electrochemical test, those B modified NCM811 cathode materials presented enhanced electrochemical performance. Among the synthesized samples, Li(Ni 0.8 Co 0.1 Mn 0.1 ) 0.99 B 0.01 O 2 exhibited the best specific capacity, with 194.7 mAh g −1 and 166.8 mAh g −1 at 0.1C and 5C respectively. The capacity retention at 0.5C was also confirmed as 98.2% after 100 cycles. Such improvement can be explained by the reduced Li/Ni ionic mixing, the increased Li ionic diffusion and the reduced interfacial resistance caused by the promoted growth of the B doped NCM811 crystals. Compared to those NCM811 materials reported elsewhere, the material obtained by this approach showed high potential for future application.
研究领域:
材料科学
·
电化学
·
储能
·
电池技术
✓ 已验证
DOI
高影响因子
Heliyon
·
2024
·
IF 3.4
Jing Lao,Yangcheng Lu
In this work, a modified Ni-rich cathode material LiNi 0.8 Co 0.1 Mn 0.1 O 2 with a unique nano cubic microstructure is successfully synthesized via a rapid precipitation assisted with hydrothermal treatment. The formation of this distinctive microstructure is attributed to the homogeneous rapid precipitation in microreactor, which predominantly generates uniform crystal nuclei. The as-prepared material with nano-/microstructure shows superior initial reversible capacity (205.3 mAh·g −1 at 2.7–4.3 V) and rate capability (163.9 mAh·g −1 at 5 C). Additionally, it maintains a high capacity (188.2 mAh·g −1 ) with a retention of 87.2 % at 1 C after 200 cycles, demonstrating outstanding cycling stability. Our work presents a straightforward and efficient approach for producing nano-cubic microstructure layered cathode materials.
研究领域:
材料科学
·
电化学
·
储能
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Zhen Chen,Cheng Li,Yating Yu,Youzhi Xu,Minghua Chen
High reactivity between single-crystalline high-nickel LiNi x Co y Mn 1-x-y O 2 cathode materials (Ni-rich SC-NCM) and the electrolyte is considered to be the main cause of fast capacity decay. To prevent direct their direct contact, we utilized a wet coating process to uniformly coat the surface of SC-NCM811 with a layer of brominated phosphoric acid tri-p-cresyl ester (Br-TCP) approximately 6 nm in thickness. X-ray photoelectron spectroscopy analysis of a cycled SC-NCM811 electrode indicates that the Br-TCP coating layer not only plays a key role in reducing interfacial side reactions, but also generates LiBr, a Li-ion conductor, due to reactions with surface lithium sources. The presence of LiBr in the coating layer enhances the lithium-ion dynamics and reduces the impact of coating layer on the lithium-ion diffusion within SC-NCM811. Additionally, the strong ionic bonds of LiBr enable enhanced adhesion between Br-TCP coating layer and SC-NCM811, thereby achieving lasting protection effect. Consequently, the synergistic effects provided by the Br-TCP modification layer are beneficial to delivering excellent electrochemical performance. Specifically, the capacity retention ratio is improved from 8.95 % to 55.28 % over 400 cycles at 1 C. We believe the strategy developed herein can provide valuable guidance in designing advanced surface modified cathodes for high-performance 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
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Xinhong Hu,Kai Du,Yujia Zhang,Yabin Hou,Huiling Zhao,Ying Bai
With high specific energy density, Ni-rich layered LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM) material has become one promising cathode candidate for advanced lithium-ion batteries (LIBs). However, severe capacity fading induced by microstructure degradation and deteriorated interfacial Li + transportation upon repeated cycling makes the commercial application of NCM cathode in dilemma. To address these issues, LiAlSiO 4 (LASO), one unique negative thermal expansion (NTE) composite with high ionic conductivity, is utilized as a coating layer to improve the electrochemical performances of NCM material. Various characterizations demonstrate that LASO modification can endow NCM cathode with significantly enhanced long-term cyclability, through reinforcing the reversibility of phase transition and restraining lattice expansion, as well as depressing microcrack generation during repeated delithiation-lithiation processes. The electrochemical results indicate that LASO-modified NCM cathode can deliver an excellent rate capability of 136 mAh g −1 at a high current rate of 10 C (1800 mA g −1 ), larger than that of the pristine cathode (118 mAh g −1 ), especially higher capacity retention of 85.4% concerning the pristine NCM cathode (65.7%) over 500 cycles under 0.2 C. This work provides a feasible strategy to ameliorate the interfacial Li + diffusion and suppress the microstructure degradation of NCM material during long-term cycling, which can effectively promote the practical application of Ni-rich cathode in high-performance LIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）