LANGMUIR
·
2024
·
IF 3.7
Yue Leng,Shengde Dong,Zhan Chen,Yanxia Sun,Qi Xu,Luxiang Ma,Xin He,Chunxi Hai,Yuan Zhou
In this study, we addressed the poor cycling and rate performance of LiNiO2, a material with ultrahigh nickel content considered a strong contender for high-energy-density lithium-ion battery cathodes. We introduced nano-Al2O3 during the lithiation process to achieve dual modified material through bulk phase element doping and in situ LiAlO2 coating. Comparison revealed notable improvements in the modified materials. In particular, LiNi0.99Al0.01O2 maintained a capacity retention rate of 73.1% after 300 cycles in a long-cycle test at 0.5C current density, outperforming the undoped material. In rate performance tests, the doped samples consistently exhibited higher discharge-specific capacities than that of the undoped counterpart. Notably, at a high current density of 5C, LiNi0.99Al0.01O2 exhibited a discharge-specific capacity of 101.75 mAh g–1. The results indicate that an appropriate amount of Al doping can effectively stabilize the layered structure of the cathode material and delay the irreversible phase transition from H2 to H3. Further, Al doping facilitates the formation of a LiAlO2 coating on the surface of the particles. This coating acts as a fast-ion conductor, enhancing the transport of lithium ions and reducing the erosion of the active material by the electrolyte.
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
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Kang Cheng,Xinyue Liu,Qin Lu,Dongni Wu,Weichao Huang,Chaoyong Deng
Cr 3+ -free near-infrared (NIR) phosphors are currently gaining significant attention in various application fields. A novel Fe 3+ -activated LiAlO 2 NIR phosphor was successfully synthesized by high-temperature solid-state method. Under excitation of 391 nm and 467 nm, the phosphor emits near-infrared light with wavelengths ranging from 600 to 850 nm. The emission bands with peaks at 725 nm correspond to the transition from 4 T 1 ( 4 G) to the ground state energy level 6 A 1 ( 6 S). The optical band gap of LiAlO 2 was calculated using Density Function Theory (DFT) and diffuse reflectance spectrum, respectively. The thermal stability of the sample was measured under 391 nm and 467 nm excitation, showing that the emission intensity at 413 K is 55.3 % and 52.4 % of the emission intensity at room temperature .
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
IONICS
·
2019
·Vol. 25
·期 12
·5681-5688
·
IF 2.289
Wang Li-Zhen,Yang Wei,Lv Teng-Fei,Gao Ke-Zheng,Yan Ji
In this paper, core-shell like LiAlO 2 -coated Li 1.2 Ni 0.13 Co 0.13 Mn 0.54 O 2 composite was synthesized by an improved solvothermal method. The surface of the material becomes rough after LiAlO 2 coating with a thickness of 5–10 nm. Meanwhile, the surface-coating component with the layer structure α-LiAlO 2 can change the dispersion of transition metal elements. When tested in 2.0–4.8 V at 0.05 °C, the initial discharge capacity of the LiAlO 2 -coated sample is 206.4 mAh g −1 with the columbic efficiency of 78.0%, which is higher than that of the pristine Li-rich Li 1.2 Ni 0.13 Co 0.13 Mn 0.54 O 2 sample. Further tested under 1 C rate, the coated sample possesses 151.4 mAh g −1 of specific capacity and maintains 149.0 mAh g −1 after 50 cycles with the capacity retention of 98.4%. The improved reversible capacity, rate capability, and cycling durability of the Li 1.2 Ni 0.13 Co 0.13 Mn 0.54 O 2 material are attributed to the synergistic effect of surface coating of highly Li-conductive LiAlO 2 and the fuzzy interface between LiAlO 2 and Li 1.2 Ni 0.13 Co 0.13 Mn 0.54 O 2 .
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
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
Journal of Energy Chemistry
·
2025
·
IF 14.9
Xiang Li,Li Wang,Zhengguo Gu,Xuanhao Wu,Feiyue Tu,Naiwen Liang,Xiaofan Liu,Wenqing Ma,Zhongchang Wang,Lezhi Yang,Lishan Yang
The prelithiated SiO x anode showcases markedly improved Li-storage capabilities compared to its unlithiated counterparts, yet it faces hurdles such as slurry gassing, electrolyte deterioration, and capacity fade attributed to residual alkali and an unstable electrolyte/anode interface. To tackle these challenges, we propose a strategic utilization of residual alkali by creating an in-situ γ -LiAlO 2 functional layer on the prelithiated SiO x @C anode material. This is accomplished by incorporating a minor amount of Al 2 O 3 into the SiO x @C/LiH precursor mixture before the solid-phase prelithiation process. The resulting modified prelithiated SiO x @C anode with in-situ formed electrolyte-isolating γ -LiAlO 2 layer exhibits no discernible slurry gas generation within 7 days and substantially mitigates side reactions with the electrolyte, thereby boosting the initial coulombic efficiency and cycling stability of the SiO x @C anode. In half-cell evaluations, the prelithiated SiO x @C anode demonstrates a high Li-storage capacity of 1323 mAh g −1 and an impressive initial coulombic efficiency of 91.09%. When assessed in a 3.2 Ah 18650 cylindrical battery, the prelithiated SiO x @C anode showcases exceptional cyclability, retaining 81% of its capacity after 1000 cycles, underscoring its potential for practical applications. This study introduces a scalable and cost-effective prelithiation technique that propels the development and practical deployment of Si-based anodes by resolving persistent scientific challenges with the use of inexpensive additives.
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 Applied Energy Materials
·
2021
·
IF 6.024
Caihong Xue,Dandan Jin,Hui Nan,Haomin Wei,Huiyuan Chen,Chao Zhang,Shiai Xu
Poly(vinylidene fluoride) (PVDF) gel polymer electrolytes (GPEs) show great potential for application in lithium-ion batteries (LIBs) due to their outstanding characteristics. However, the inferior thermal stability and low ionic conductivity limit their practical application. Herein, γ-LiAlO2 was synthesized and applied in a polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP)-polybenzimidazole containing an ether bond (OPBI)-polyoxyethylene (PEO) (PHOP-LAO) GPE for improving its thermal stability and ionic conductivity properties. The ionic conductivity of PHOP-LAO is 4.83 mS cm–1, which increased by 210% compared with that of the PHOP sample. It is worth noting that the thermal shrinkage of the PHOP-LAO membrane is greatly reduced (less than 1% at 230 °C for 1 h). PHOP-LAO shows outstanding thermal stability, which is beneficial for the safety of LIBs. When the PHOP-LAO GPE was applied to LIBs with Li1.04Ni1/3Co1/3Mn1/3O2 as a cathode, the LIBs exhibit remarkable and stable cycling performance with a discharge capacity retention rate of 85% after 500 cycles at a 2 C rate and maintain a power capability retention rate of up to 77% of the initial capability at the high rate of 10 C (50 °C). PHOP-LAO thus shows great potential for achieving ultra-stable and safe LIBs in the future.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Longfei Wang,Jiayang Sun,Yirui Liang,Linze Lv,Lei Huang,Yan Wang,Qunting Qu,Ming Shen,Honghe Zheng
Graphite is still the dominant anode material for the state-of-the-art lithium-ion batteries. Natural graphite (NG) has the advantages of high specific capacity, abundant resources and less energy consumption. However, the high surface area, high interfacial reactivity, and the sluggish interfacial kinetics result in low initial Coulombic efficiency (ICE), poor rate performance and unsatisfactory cycle-life. Herein, we propose a uniform and fast Li + -conductive LiAlO 2 interface on NG surface with polydopamine-mediated Al 3+ anchoring route. After proper heat-treatment, the in-situ developed inorganic LiAlO 2 layer greatly reduces interfacial resistance by accelerating the interfacial Li + migration kinetics. More importantly, the inorganic LiAlO 2 layer reduces the surface reactivity of the NG anode and promotes the formation of fluorinated SEI with enhanced electron work function, high stability and fast Li + diffusion properties. As the result, the ICE of the prepared NG@PLAO anode exhibits a high ICE of 92.5 % due to the suppressed interfacial side reactions of the electrolyte components. At a high charge-discharge rate of 4C, the fabricated NCM523||NG@PLAO full cell retains 80.3 % of its nominal capacity over 800 cycles. The novel interfacial chemistry engineering well solves the uniform growth of inorganic interface on NG surface via polydopamine-mediation. It provides new thoughts to improve the fast charge and cycleability of NG anode in lithium-ion batteries.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Alemtsehay Tesfay Reda,Dongxiang Zhang,Xiyan Xu
The search for efficient material to capture iodine from off-gas streams continues. Herein, a novel composite of lithium aluminate and melamine , abbreviated as LiAlO 2 -Mel, was synthesized and exhibited high vapor iodine capture capacity accompanied by good regeneration ability. The LiAlO 2 -Mel showed an enormous capture capacity of 1281 mg/g within 4 h towards I 2 (g) at 150 °C. The kinetics study showed that the dominant process (at 150 °C) was chemisorption via N∙∙∙I and C–NH∙∙∙I bonding mechanisms. Additionally, LiAlO 2 -Mel has a low surface area (14.6157 m 2 /g) yet produced high capacity, suggesting chemisorption played a critical role. However, physisorption was the dominant process at lower temperature values, as proved by kinetics fittings and activation energy (E a = 23.19 KJ/mol) studies. The kinetics models were validated by statistical error validity models (sum of square error, Chi-square test, and normalized standard deviation). Thermogravimetric analysis and adsorption-desorption experiments showed that the LiAlO 2 -Mel can be recovered by heat treatment (25–800 °C) in N 2 atmosphere and ethanol washout (24 h, 25 °C) of the LiAlO 2 -Mel-I. The high capture capacity, along with eco-friendly and cost-effectiveness, highlights the promising potential of LiAlO 2 -Mel for iodine capture.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 2
·1-10
·
IF 2.8
Cao Xuefeng,Chen Deqin,Li Fengrong,Liu Laijun,Shen Qinghua,Li Chunchun
A series of low-permittivity LiAl 1 − x B x O 2 (0.01 ≤ x ≤ 0.10) ceramics were fabricated by a conventional solid-state reaction method and were characterized for their phase evolution, crystal structure, and dielectric properties. Single-phase LiAl 1 − x B x O 2 solid solutions were formed at a limited compositional range ( x = 0.05) while the secondary phase Li 2 (BAlO 4 ) companied at higher dopant contents. Boron substitution facilitated the sintering behavior and optimized the densification of LiAlO 2 , resulting in dense microstructures and improved dielectric properties. A composition with x = 0.075 exhibited a high quality factor ( Q×f ) of 40,288 GHz along with a low relative permittivity ( ε r ) of 6.3 and a temperature coefficient of resonance frequency (τ f ) of – 191 ppm/ o C. All results indicate that the LiAl 1 − x B x O 2 ceramics can be a promising candidate material in the application of the substrate.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2024
·
IF 3.2
Zezhen Yin,Yun Zhang,Shihua Ding,Tianxiu Song,Xiaoning Li,Jiaying Dan
Low permittivity LiAl 1- x Li x O 2- x ( x = 0–0.02) ceramics were prepared by conventional solid-state reaction method. XRD analysis indicated that the system remained single phase solid solution in the whole range of x examined. Li + heterovalent substitution for Al 3+ generated oxygen vacancy O vac , and enhanced the relative density from 94.33% to 97.13%. The dielectric constant ε r showed near linear variations versus sintering temperature and x value. Their relations mainly depended on the combined effects of relative density and dielectric polarizability . The quality factor Q×f was more than doubled from 15,647 GHz to 31,627 GHz, due to the packing fraction enlargement and covalent bond strengthening. The variation of temperature coefficient of resonance frequency τ f was explained from the view of oxygen bond valence. When x = 0.01, the ceramic exhibited the best microwave dielectric properties with ε r = 5.37, Q×f = 31,627 GHz and τ f = −104.2 ppm/°C when sintered at 1300 °C for 5 h.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2023
·Vol. 19
·期 45
·2302934
·
IF 13.3
Xiao Xu,Qing Sun,Yuanyuan Li,Fengjun Ji,Jun Cheng,Hongqiang Zhang,Zhen Zeng,Yiwei Rao,Hongbin Liu,Deping Li,Lijie Ci
All-solid-state lithium-ion batteries (ASSLBs) employing silicon (Si) anode and sulfide electrolyte attract much attention, since they can achieve both high energy density and safety. For large-scale application, sheet-type Si anode matching sulfide based ASSLBs is preferred. Here, a LiAlO 2 layer coated Si (Si@LiAlO 2 ) is reported for sheet-type electrode. This electrode employs conventional slurry coating methods without adding any sulfide electrolyte. The effect of LiAlO 2 coating on the electrochemical performance and morphology evolution of Si electrode is investigated. Since the high mechanical strength and ionic conductivity of LiAlO 2 layer can sufficiently relieve the huge expansion of Si and promote the Li + diffusion, the electrochemical performance is significantly enhanced. The Si@LiAlO 2 electrodes deliver high coulombic efficiency exceeding 80% and hold considerable specific capacity of 1205 mAh g −1 (150 cycles, 0.33 C). The Si@LiAlO 2 | LiNi 0.83 Co 0.11 Mn 0.06 O 2 full-cells exhibit a high reversible capacity of 147 mAh g −1 (0.28 mA cm −2 ) and a considerable capacity retention of 80.2% (62 cycles, 2.8 mA cm −2 ). This work demonstrates promising practicability and provides a new route for the scalable preparation of Si electrode sheets for ASSLBs with extended lifespan.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SusMat
·
2022
·Vol. 2
·期 1
·104-112
·
IF 0
Qiang Zhao,Xin Chen,Wang Hou,Beirong Ye,Yongqi Zhang,Xinhui Xia,Jinshu Wang
Li has garnered enormous attention for next-generation Li metal batteries owing to its remarkable theoretical capacity. Unfortunately, as an anode, Li suffers from serious safety issues and fast capacity fading due to the formation of Li dendrites, which hinders the practical application of Li anode. Herein, a LiAlO 2 -PVDF composite modification layer is fabricated on the surface of Li metal to enhance its stability and electrochemical performance. Benefitting from the synergetic effects of high Li + conductivity, high Li + transference number, excellent mechanical properties, superior chemical durability, and compactness of the modification layer, the LiAlO 2 -PVDF@Li electrode delivers an ultra-long lifespan and a high capacity retention rate in the LiAlO 2 -PVDF@Li│LiFePO 4 full cell. The proposed strategy provides a new alternative anode for Li metal batteries with high performance and scalable production.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
危险品化学品经营许可证（带存储）