Nanoscale
·
2019
·Vol. 11
·期 18
·8967-8977
·
IF 6.97
Li Li,Rui Zhao,Tinghua Xu,Dandan Wang,Du Pan,Kun Zhang,Caiyan Yu,Xia Lu,Guanjie He,Ying Bai
LiNi0.5Mn1.5O4 (LNMO) spinel has drawn increasing attention due to its high voltage, stabilized electrochemical performance and safety features as a cathode for lithium-ion batteries. However, the main challenge lies in its unstable surface structure, especially at elevated temperatures. In this paper, we decorate the LNMO precursor with a solid electrolyte of Li1.4Al0.4Ti1.6(PO4)3 (LATP) via a facile sol–gel method, followed by a co-crystallization process at 820 °C, to successfully generate a LATP modification shell at the surface of LNMO. The LATP modification shell could not only optimize the morphology of LNMO including the limitation of particle growth and control of crystalline orientation, but also realize ion doping during the co-crystallization process. By tuning the LATP contents, the 2 wt% LATP modification is found to be the most effective at balancing the interfacial stability and Li+ diffusion kinetics of LNMO, as well as enhancing its rate capability and capacity retention at high temperatures. As a result, the 2 wt% LATP-modified LNMO cathode exhibits a high reversible capacity of 84.8 mA h g−1 after 500 cycles with a capacity retention of 68.9%, and a superior rate capability (102.0 mA h g−1 at 20 C) at room temperature. Moreover, this electrode also delivers a good capacity retention of 85.7% after 100 cycles at 55 °C, which is ascribed to the stabilized interface with a LATP protective layer.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING
·
2024
·
IF 1.5
Su Yongyou,Zhu Bowen,Zhang Yingjie,Meng Qi,Dong Peng
With the rapid development of the global economy, energy crisis and environmental protection problems are in urgent need of solution. And the development of energy-saving and new energy vehicles is an inevitable trend to improve the energy structure, alleviate the conflict between oil supply and demand, and improve the living environment of human beings. Layered high nickel material is considered as one of the most promising cathode materials for power batteries because of its high energy density, high platform potential and good rate capability. However, it has problems such as high dependence on cobalt resources and poor cycling stability. In this paper, the preparation of layered high nickel cobalt-free cathode materials is investigated. Because Fe element has the advantages of large reserves and low price. At the same time, Fe makes the layered structure of the positive electrode more stable. In this paper, LiNi 0.8 Mn 0.17 Fe 0.03 O 2 (Li/TM = 1.01, 1.03, 1.05) materials with different Li/TM ratios were prepared by solid-phase method to investigate the effects of different Li/TM ratios on the structural and electrochemical properties of LiNi 0.8 Mn 0.17 Fe 0.03 O 2 materials. The results show that the materials synthesized with different Li/TM ratios have a layered structure. When the Li/TM ratio is 1.03, the crystal structure is the best and the degree of Li/Ni mixing is the least. The electrochemical performance study shows that the synthesized materials have the optimal electrochemical performance at the Li/TM ratio of 1.03. The electrochemical behavior during lithium embedding/delithiation was also investigated by quasi-in situ XRD, dQ/dV and CV tests. This study will provide some reference and guidance for the development and application of next-generation low-cost cobalt-free lithium-ion batteries.
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
WASTE MANAGEMENT
·
2021
·
IF 7.145
Huimeng Yang,Bowen Deng,Xiaoyun Jing,Wei Li,Dihua Wang
Regenerating cathode material from spent lithium-ion batteries (LIBs) permits an effective approach to resolve resource shortage and environmental pollution in the increasing battery industry. Directly renovating the spent cathode materials is a promising way, but it is still challenging to efficiently remove all of the complex impurities (such as binder, carbon black, graphite and current collectors) without destroying the material structure in the electrode. Herein, a facile strategy to directly remove these impurities and simultaneously repair the degraded LiCoO 2 by a target healing method is reported. Specifically, by using an optimized molten salt system of LiOH-KOH (molar ratio of 3:7) where LiNO 3 and O 2 both serve as oxidants, the impurities can be completely removed, while the structure, composition and morphology of degraded LiCoO 2 can be successfully repaired to commercial level based on a two-stage heating process (300 °C for 8 h and 500 °C for 16 h, respectively), resulting in a high recovery rate of approximately 100% for cathode material. More importantly, the regenerated LiCoO 2 exhibits a high reversible capacity, good cycling stability and excellent rate capability, which are comparable with commercial LiCoO 2 . This work demonstrates an efficient approach to recycle and reuse advanced energy materials.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
ECS Journal of Solid State Science and Technology
·
2022
·Vol. 11
·期 11
·113001
·
IF 2.483
Yonglian Xiong,Ying Wei,Wenyi Rong,Jin Shang,Kepiao He,Ting Yi,Yongsheng Fan
The LiMnxFe1−xPO4/C (x = 0.5, 0.6, and 0.7) cathode materials for lithium-ion batteries were synthesized by polyethylene glycol (PEG) 400 as the carbon source via a combination of wet ball-milling and high-temperature solid-state reaction. The analysis results of X-ray diffraction (XRD), scanning electron microscopy (SEM), and high-resolution transmission electron microscopy (HRTEM) indicate that the as-prepared LiMn0.6Fe0.4PO4/C sample has a single-phase orthorhombic olivine structure, and the majority of particle sizes range from 100 to 200 nm with a ∼2–3 nm carbon coating layer. The electrochemical measurements demonstrate that the obtained LiMn0.6Fe0.4PO4/C composite possesses preferable Li-ion storage properties, and the discharge capacity of 137.7 mAh g−1 at 1 C rate, which is 83.6% of that at 0.1 C rate. The composite also exhibits outstanding cycling stability, with a capacity retention of 98.2% after 100 cycles at 0.2 C rate. And the differential capacity analysis (dQ/dV) reveals that the dominating degradation of LiMn0.6Fe0.4PO4/C is caused by the Mn2+ /Mn3+ redox capacity loss which is located at ∼4.12/3.96 V, whether during the charge or discharge process. Moreover, the LiMn0.6Fe0.4PO4/C sample delivers excellent high-temperature performance (45 °C), with improved reversible capacity and capacity retention of 148.7 mAh g−1 and 99.3% after 80 cycles at 0.5 C rate, respectively.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Energy & Environmental Science
·
2024
·Vol. 17
·期 11
·3807-3818
·
IF 32.4
Shenyang Xu,Zhefeng Chen,Wenguang Zhao,Wenju Ren,Chenxin Hou,Jiajie Liu,Wu Wang,Chong Yin,Xinghua Tan,Xiaobing Lou,Xiangming Yao,Zhihai Gao,Hao Liu,Lu Wang,Zuwei Yin,Bao Qiu,Bingwen Hu,Tianyi Li,Cheng Dong,Feng Pan,Mingjian Zhang
As commercial cathodes with the highest practical capacity, the structural nature of Li-rich Mn-based (LMR) cathodes, composite or solid solution, is still under debate. Due to the extreme structural similarity of two layered-phase components, namely, the monoclinic phase (C2/m) and rhombohedral phase (Rm), no single tool can resolve this concern alone. Herein, we combined multiple advanced techniques to comprehensively study the structural changes during synthesis of LMR cathodes from different aspects such as the elemental distribution, local structure, long-range structure, and short-range structure, revealing a clear process from the formation of two phases to the gradual phase fusion and eventually to a nearly solid solution. Particularly, X-ray pair distribution function (PDF) analysis combined with theoretical simulations reveals for the first time that the transition metal (TM)–TM distance increases with the progress of the phase fusion, which makes the short-range structural change in TM–TM atomic pairs an effective parameter for judging the extent of phase fusion. Eventually, excellent electrochemical performance was achieved by balancing capacity and cycling stability through adjusting the phase fusion to a medium extent in lithium and sodium two layered-phase components. This study establishes an approach to investigate the structural evolution in the complicated multiple-phase system and provides valuable insights into the design and optimization of cathodes by tuning the phase fusion extent.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
MATERIALS LETTERS
·
2021
·
IF 3.423
Fei Chen,Chipeng Jiang,Like Xu,Xiaoyu Li,Qiang Shen
In view of the shortcomings of low utilization rate of disulfide cathode for thermal battery, chloride has been developed as a candidate material for thermal battery cathode. In this case, PbCl 2 was tried to be used as a cathode material for thermal batteries and tested the electrical properties of single battery. The discharge specific capacity can reach 168 mAh/g at 450 °C and 0.5 C current, the voltage plateau reaches 1.8 V, and the active material utilization rate is as high as 87.5% when the cut-off voltage is 0.5 V. The only discharge platform and high utilization rate enable PbCl 2 to be used as the active material for thermal batteries, which also provides a new direction for the chloride cathode active material for thermal batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHEMISTRY COMMUNICATIONS
·
2017
·
IF 4.396
Cailing Liu,Shaohua Luo,Hongbo Huang,Zhiyuan Wang,Aimin Hao,Yuchun Zhai,Zhaowen Wang
A novel layered ternary material K 0.67 Ni 0.17 Co 0.17 Mn 0.66 O 2 has been fabricated via a co-precipitation assisted solid-phase method and further evaluated as a cathode for potassium-ion batteries for the first time. Highly reversible K + intercalation/deintercalation is demonstrated in this material. It delivers a reversible capacity of 76.5 mAh/g with average voltage of 3.1 V and shows good cycling performance with capacity retention of 87% after 100 cycles at 20 mA/g. This work may give a new insight into developing cathode materials for potassium-ion batteries.
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 Materials Chemistry A
·
2015
·Vol. 3
·期 35
·18098-18104
·
IF 7.443
Xiaogang Li,Mumin Rao,Haibin Lin,Dongrui Chen,Yanlin Liu,Shizhu Liu,Youhao Liao,Lidan Xing,Mengqing Xu,Weishan Li
We report a composite (CG-S@PANI), sulfur (S) loaded in curved graphene (CG) and coated with conductive polyaniline (PANI), as a cathode for lithium–sulfur batteries. CG is prepared by splitting multi-wall carbon nanotubes and loaded with S via chemical deposition and then coated with polyaniline via in situ polymerization under the control of ascorbic acid. The physical and electrochemical performances of the resulting CG-S@PANI are investigated by nitrogen adsorption–desorption isotherms, X-ray powder diffraction, thermogravimetric analysis, transmission electron microscopy, electrochemical impedance spectroscopy, charge–discharge tests, and electronic conductivity measurements. CG-S@PANI as a cathode for lithium–sulfur batteries delivers an initial discharge capacity of 851 mA h g−1 (616 mA h g−1 on the basis of the cathode mass) at 0.2 C with a capacity retention of over 90% after 100 cycles. This nature is attributed to the co-contribution of CG and conductive PANI to the concurrent improvement in electronic conductivity and chemical stability of the sulfur cathode.
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
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Seokyoung Choi,Wuliang Feng,Zhongzhu Liu,Yongyao Xia
Spinel LiMn 1.5 Ni 0.5 O 4 (LMNO) is one of the promising cathode materials for the next generation Li-ion batteries due to its voltage platform. However, the dissolution of the transition metal at high voltage is the biggest obstacle that LMNO suffers from. In this study, we successfully suppressed transition metal dissolution in LMNO by the morphology control from regular octahedron to spherical. Niobium was integrated as a dopant, which restricted the growth of (1 1 1) crystal face, and increased the indices of crystal faces by homogenizing the surface energy. By changing to a smaller surface area with spherical morphology, the contact area with the electrolyte was reduced, thus suppressing the dissolution of the Mn ion. Consequently, the niobium-doped LMNO exhibited superior rate performance, capacity retention with 74.1% at 1C after 500 cycles in half-cell, and thermal stability compared to pristine LMNO.
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 MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 19
·23786-23797
·
IF 2.478
Zhou Dengfeng,Li Junqi,Chen Chaoyi,Chen Can,Wu Hongming,Lin Fangchang,Guo Jianbing
Ruthenium doped LiNi 0.5 Mn 1.5 O 4 (LNMO) microspheres has been prepared by a simple solid-state reaction process. The as-prepared sample was characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS) and electrochemistry performance test. The sample shows a spinel crystal structure without RuO 2 impurity phase, and Ru doped sample crystal plane spacing increases. Combined with EDS spectrum, it indicates that the Ru ion was doped in the LNMO and distributed homogeneously. The XPS also further confirm the existence of Ru ions, and Ru has no obvious influence on Ni and Mn elements. The SEM images show that all the samples are sphere-like, with many polyhedral particles attached to the surface. When doped with 4% Ru ion, many cavities appear on the surface to form a porous structure. Electrochemical analysis confirms that the Ru-doped sample exhibits better electrochemical properties regarding discharge capacity, cycle stability, and rate performance. The 4% Ru-doped sample owns an initial discharge capacity of 125 mAh g −1 at 0.25C rate, with a capacity retention of 92% after 50 charge–discharge cycles. Moreover, at high current density (1C), Ru doped sample’s discharge capacity is 103 mAh g −1 while the original is only 86 mAh g −1 . The excellent electrochemical properties are attributed to the Ru doping that increases the interlayer spacing and reduces the charge-transfer impedance ( R ct ), which is beneficial to lithium ion-exchange.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Advanced Energy Materials
·
2023
·Vol. 13
·期 37
·2302058
·
IF 27.8
Zhenzhen Liu,Huaimeng Li,Miaomiao Han,Liang Fang,Zhen Fu,Haimin Zhang,Guozhong Wang,Yunxia Zhang
Faced with the forthcoming tide of retired lithium-ion batteries (LIBs), it is imperative to explore effective regeneration and upcycling strategies to alleviate the resource shortage, address environmental pollution, and cater to the demand for high-energy-density cathode materials. Herein, a facile, non-constructive, one-stone-for-three-birds solid-phase sintering strategy is proposed to regenerate the degraded LiCoO 2 (D-LCO) cathode and even upgrade its stability at high voltages, in which three birds, i.e., lithium supplement, Li 2 SO 4 coating, and Mn doping into Co sites while N, S doping into Li-O slabs are simultaneously hit with one stone (one-pot solid-phase sintering). Benefiting from these favorable characteristics, the upcycled cathode not only yields high discharge-specific capacity of 188.2 mAh g −1 at 0.2 C, but also delivers superior cycling performance with 92.5% of capacity retention after 100 cycles (86.4% after 300 cycles) at 0.5 C and excellent rate capability at a high cutoff voltage of 4.5 V, superior to a freshly commercial counterpart. This work is expected to provide meaningful guidance for the upcycling of D-LCO into high-energy-density batteries with long-term cycling stability.
研究领域:
材料科学
·
能源技术
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Wei Wei,Tao Ye,Zunqiu Xiao,Kejia Xiang,Huaying Wang,Zhongtai Zhang,Shitong Wang,Zilong Tang
The development of cathode materials has always been one of the most crucial areas of research in the field of sodium-ion batteries. Sulfate-based polyanionic materials, known for their high working voltage characteristics, have received widespread attention. In this work, a fluoro-sulfate sodium-ion battery cathode material, Na3Fe2(SO4)3F modified with carbon nanotubes, was developed using a low-temperature solid-state annealing method. This Na3Fe2(SO4)3F cathode exhibits an exceptionally high voltage of 3.77 V, excellent discharge capacity (102 mAh/g at 0.1C), and good rate capability. This material broadens the research directions for cathode materials and holds promise as a foundation for the further development of high-performance sodium-ion batteries.
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
危险品化学品经营许可证（带存储）