ADVANCED POWDER TECHNOLOGY
·
2021
·Vol. 32
·期 7
·2493-2501
·
IF 4.833
Hongling Yi,Lei Tan,Lingfeng Xia,Lingjun Li,Hongxing Li,Zengsheng Liu,Chu Wang,Zixiang Zhao,Junfei Duan,Zhaoyong Chen
The well-established LiNi 0.5 Co 0.2 Mn 0.3 O 2 (NCM523) cathode materials possess a broad prospect for Li-ion batteries. However, the NCM523 still suffers severe capacity fading and structural instability. In this research, Ce-doped and CeO 2 -coated NCM523 cathode materials are synthesized by a smart one-step calcination process. It is found that the CeO 2 coating layer is formed during high-temperature calcination. The CeO 2 coating layers stop the electrode from being exposed to the electrolyte directly and promote the kinetics of lithium deintercalation. Besides, Ce doping could suppress the bulk cation-mixing degree. Electrochemical tests suggest that Ce-modification improves the capacity retention of cathode materials. The optimized Ce-modification cathode material, among 2.7 V and 4.6 V, not only shows the best capacity retention of 76.2%, but also delivers a discharge capacity of 178.2 mAh g −1 at 1 C. This smart modification strategy provides novel ideas for advanced LIBs.
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Yulin He,Ying Li,Yaochun Liu,Nianchun Yao,Jiamei Li,Yang Liu
Inspired by the WO 3 transition metal semiconductor, a simple liquid phase WO 3 coating strategy is introduced to improve the surface stability of LiNi 0.5 Co 0.2 Mn 0.3 O 2 . The electrochemical performance of WO 3 -coated LiNi 0.5 Co 0.2 Mn 0.3 O 2 is improved at both a high cut-off voltage (4.5 V) and high temperature (50 °C). With the WO 3 (0.6 wt%) coating amount optimized, the material capacity retention is maintained at 138 mAh g −1 and 170.9 mAh g −1 at 25 °C and 50 °C after 200 cycles compared with 107.8 mAh g −1 and 143.9 mAh g −1 , respectively, for pristine NCM523. The WO 3 -coated sample also exhibits a better rate capability, maintaining 126 mAh g −1 at 25 °C in the voltage range of 3–4.5 V at the current density of 5 C. The enhanced properties of the WO 3 -coated LiNi 0.5 Co 0.2 Mn 0.3 O 2 due to the WO 3 coating layer result from the interface that prevents immediate contact between the electrolyte and the active material as well as the lower polarization and electrochemical resistance of the battery. SEM, TEM, XPS and EIS further reveal these improved electrochemical performances, which indicate the success of the approach for regenerating NCM523.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Lingjun Li,Lingfeng Xia,Huiping Yang,Xuehui Zhan,Jie Chen,Zhaoyong Chen,Junfei Duan
The high voltage application of the LiNi 0.5 Co 0.2 Mn 0.3 O 2 cathode is still hindered by its unstable surficial structure and poor capacity retention. Surface coating has been proved to be an effective strategy to deal with these problems. However, previous multistep surface coating approaches greatly complicate the synthesis procedure. In this work, a simple and large-scale solid-state approach is developed to prepare lanthanum-based oxides co-coated LiNi 0.5 Co 0.2 Mn 0.3 O 2 cathode materials . Electrochemical tests indicate that the co-coated samples exhibit superior cycle life and higher rate performance than those of the pristine sample. Further studies reveal that the enhanced interface stability and facilitated electron transportation can be attributed to the synergetic contribution provided by the lanthanum-based oxides co-coating layer. The present work demonstrates that our approach can achieve cathode synthesis and surface coating synchronously, and shows great potential to apply on a large scale and extent to all Ni-rich cathodes.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机化学
·
功能材料
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DOI
高影响因子
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2022
·Vol. 50
·期 7
·100101
·
IF 1.193
Ranehipura Dewage Lahiru SANDARUWAN,Bo-Yu WANG,Suwanda Arachchige Don Rumesh MADHUSANKA,Shun-Chao MA,Hong-Yu WANG
Transition to aqueous electrode fabrication of lithium ion batteries (LIBs) with green binder is certainly profitable and imperative in terms of economic benefit and environmental wellness. However, aqueous processing of cathode in LIB, especially the ternary LiNi x Co y Mn z O 2 (NCM), is still problematic and novel water-soluble binder should be developed to boost the electrochemical performances of cathode. In this regard, commercially available white latex (WL), cooperating with CMC (carboxymethyl cellulose), is employed as water-processable binder mixture for manufacturing NCM cathode. Interestingly, the prepared NCM cathode assisted by WL/CMC mixture exhibits improved electrochemical performances including better initial reversible capacity of 161.7 mAh g −1 at 0.5 C current density, long-term cyclability with a reversible capacity of 155 mAh g −1 along with high-capacity retention of around 96% after cycling 200 times, and even excellent rate capability, which are superior to those of the conventional counterpart base on polyvinylidene fluoride (PVdF). Moreover, the NCM|graphite full cell, which is absolutely based on this novel WL binder, also demonstrates the outstanding electrochemical behaviors.
研究领域:
电化学
·
能源材料
·
锂电池技术
·
高分子材料科学
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DOI
高影响因子
Journal of Energy Storage
·
2026
·
IF 10.7
Fang Gao,Chunli Gou,Zhanxin Geng,Mingke Yang,Jing Zhang
The recycling of spent lithium-ion batteries (LIBs) is crucial for environmental protection and resource reutilization. However, traditional recycling routes normally involve complex processes and secondary pollution. In this study, we demonstrate an effective method combining hydrothermal relithiation with low-temperature thermal annealing to directly generate the spent LIBs. We create a lithium-rich environment for spent LiNi 0.5 Co 0.2 Mn 0.3 O 2 (NCM523) cathode particles using LiOH solution, followed by surface-doping Nb elements on the active particles for enhanced electrochemical performance. The upgraded NCM523 exhibits a satisfactory repaired specific capacity of 150 mAh g −1 and excellent cycling stability by retaining 75.3% of its capacity after 200 cycles, owing to the stable Nb-doped structure. Hydrothermal relithiation combined with short thermal annealing reduces the temperature and time required for direct regeneration and shows priority in techno-economic and environmental analysis, which can be extended to regenerate spent LiCoO 2 (LCO) cathode. This simple and efficient treatment expands the feasibility of direct regeneration and offers a promising strategy for regenerating spent LIBs.
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Guiyan Sun,Shaobo Lai,Xiangbang Kong,Zhiqiang Chen,Kun Li,Rong Zhou,Jing Wang,Jinbao Zhao
A blend cathode has been prepared by mixing both LiNi0.5Co0.2Mn0.3O2 (NCM523) of high energy density and high specific capacity and LiFe0.15Mn0.85PO4/C (LFMP/C) of excellent thermal stability via a low-speed ball-milling method. The lithium ion batteries using the blend cathode with LFMP/C of optimum percent exhibit better capacity retention after 100 cycles than those using only single NCM523 or LFMP/C. Both theoretical simulation and experimental rate performances demonstrate that the electrochemical property of blend cathode materials is predictable and economical. In addition, the thermal behaviors of blend cathodes are studied by using differential scanning calorimetry analysis. The thermal stability of blend cathode materials behaves better than that of the bare NCM523 accompanied with an electrolyte. It is found that the outstanding rate and thermal performance of the blend cathode is due to the prominent synergistic effect between NCM523 and LFMP/C, and 10% LFMP/C in the blend cathode materials is the most adaptable as considering both electrochemical and thermal properties simultaneously.
研究领域:
电化学
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材料科学
·
能源存储
·
电池技术
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固态化学
·
热分析
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DOI
高影响因子
ELECTROCHIMICA ACTA
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2015
·
IF 4.504
Xinhe Yang,Zicheng Zuo,Haiyan Wang,Quanbin Chen,Hui Zhang,Zhenlei Huang,Borong Wu,Henghui Zhou
A one-step synthesis method is developed to prepare the Li[Ni 0.5 Co 0.2 Mn 0.3 ]O 2 (NCM 523) cathode with uniform tungsten-coating layer for lithium-ion battery . Such modified material shows similar properties with the bare NCM 523 in terms of the primary particles, secondary structure , and specific capacity. With W coating layer , the NCM 523 gives remarkable improvement in the long-term capacity retention in the half-cell testing, which is sharply inconsistent with the result from the full-battery tests, indicating a contradiction between the half-cell and full-battery tests in some case. After further investigations, such conflict between the half-cell and full-cell tests in evaluating the W-coating strategy is attributed to the dissolution of Li 2 WO 4 layer in the electrolyte, which probably destroys the solid electrolyte interface (SEI) on the graphite anode and irreversibly consumes the active lithium ions for renovating SEI in full-cell testing. These results will benefit researchers in the area of lithium-ion batteries to fully understand the differences between the half-cell and full-cell testing, and develop the effective strategies for cathode modifications.
研究领域:
电化学
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材料科学
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能源存储
·
电池技术
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表面改性
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固态离子学
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DOI
高影响因子
Journal of Sustainable Metallurgy
·
2026
·
IF 3.2
Teng Liumei,Liu Jiangqi,Zhou Huichen,Jin Xiao,Guo Chaozhong,Liu Weizao,Liu Qingcai,Yang Chen
The significance of recycling spent lithium-ion batteries (LIBs) has increased due to the rapid development of electric vehicles. This work developed a facile and green process that used recyclable ammonium hydrogen sulfate (NH 4 HSO 4 ) and hydrogen peroxide (H 2 O 2 ) to efficiently extract valuable metals from spent LIBs cathodes. During the investigation, NH 4 HSO 4 was employed as the leaching agent and H 2 O 2 served as the reducing agent. A series of single-factor experiments were performed to explore the effects of NH 4 HSO 4 concentration, reducing agent type and concentration, reaction temperature, reaction time, and liquid–solid ratio on extraction efficiency. The crystal structure, surface morphology, and valence state of cathode materials were determined using X-ray diffraction, scanning electron microscopy coupled with energy dispersion spectroscopy, and X-ray photoelectron spectroscopy. The results showed that the synergistic impact of NH 4 HSO 4 and H 2 O 2 could greatly improve the leaching efficiency of Li, Ni, Co, and Mn. And the ideal leaching conditions resulted in Li, Ni, Co, and Mn leaching efficiencies of 98.7%, 97.68%, 98.32%, and 97.46%, respectively. This research established a theoretical framework and offered technical support to enhance the efficient retrieval of discarded LIBs. Graphic
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产品关联
DOI
高影响因子
Nature Communications
·
2026
·
IF 18.1
Hao Shuaipeng,Zhang Yi,Liu Shuaiwei,Tan Zhouliang,Liu Wei,Xia Yuanguang,Yin Wen,Liao Yaqi,Ji Haijin,Kong Yuelin,Shao Yudi,Lv Yuelin,Qie Long,Huang Yunhui,Yuan Lixia
Direct regeneration offers a shortcut to close the material supply loop of lithium-ion batteries and is a promising recycling strategy. However, in spent LiNi 0.5 Co 0.2 Mn 0.3 O 2 positive electrode, severe bulk cation disorder and surface rock salt phase hinder Li + reinsertion. Moreover, the coexistence of single and poly-crystal particles in commercial batteries further complicates uniform re-lithiation and morphological regeneration. Herein, we propose an oxidation strategy to simultaneously regulate the structural reconstruction and morphological evolution of spent material. During oxidation, surface NiO transforms into NiOOH, while targeted oxidation of the anti-site Ni 2+ to Ni 3+ in the bulk reduces Li + /Ni 2+ mixing. This reconstructs Li + diffusion channels from surface to bulk, facilitating re-lithiation. Meanwhile, structural changes induce lattice expansion in secondary particles, causing their decomposition into primary particles and forming uniform precursor particles. These particles, with continuous Li + transport channels and NiOOH surface, agglomerate into large single-crystal during calcination. The regenerated LiNi 0.5 Co 0.2 Mn 0.3 O 2 achieves a high tap density of 2.57 g/cm 3 and retains 80.2% capacity after 600 cycles. This work presents a concept for the direct regeneration of degradable positive materials.
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DOI
PubMed
高影响因子
HYDROMETALLURGY
·
2023
·
IF 4.7
Xi Jin,Xiaogang Zhang,Pengyang Zhang,Sohrab Rohani,Haoyan Li,Minyu He,Liumei Teng,Qingcai Liu,Weizao Liu
The traditional liquid acid leaching method for recycling spent lithium-ion batteries (LIBs) has serious environmental pollution and unsafe transportation. In this study, solid sodium bisulfate was applied as a leaching agent to recover lithium, cobalt, nickel and manganese from the cathode active material of spent LIBs in the presence of a reductant, hydrogen peroxide. It was found that the leaching efficiencies were approximately 93.0, 91.5, 95.5 and 96.6%, respectively, for Ni, Co, Mn and Li under the conditions of 1 mol/L NaHSO 4 and 3 vol% H 2 O 2 as reductant within 30 min at 70 °C and a pulp density of 20 g/L. Kinetic data for the dissolution of valuable metals in the temperature range 40–70 °C showed the kinetic model governed by the Avrami equation. The apparent activation energies for leaching of Ni, Co, Mn and Li were determined as 43.8, 44.2, 42.2 and 27.5 kJ/mol, respectively, indicating that the leaching process was controlled by a surface chemical reaction. This process can be a convenient alternative method for recovering valuable metals from spent LiNi 0.5 Co 0.2 Mn 0.3 O 2 .
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
Energy Storage
·
2019
·Vol. 2
·期 2
·e109
·
IF 0
Zilong Zhuang,Lezhi Yang,Bowei Ju,Ao Yin,Gang Lei,Qian Zhou,Yating Tang,Zhiyuan Deng,Feiyue Tu,Shibiao Qin
Electrochemical and chemical interfacial reaction mechanisms between LiNi 0.5 Co 0.2 Mn 0.3 O 2 (NMC532) and poly(propylene carbonate) solid polymer electrolyte (PPC-SPE) are studied. Ni 3+ and Co 4+ species which are electrochemically oxidized from Ni 2+ and Co 3+ during the charging process will induce the decomposition of PPC. Fourier transform infrared spectroscopy (FT-IR) and 1 H nuclear magnetic resonance (NMR) analysis confirm that the decomposition products of PPC contains ether, which might produce through condensation reaction of alcohol compounds. To retard this side reaction, graphene oxide is applied to coat commercial LiNi 0.5 Co 0.2 Mn 0.3 O 2 particles via a facile chemical approach. Compared with pristine cathode, the coated sample displays higher initial capacity, better cycle stability and lower interfacial resistance after cycled. After 300 cycles, the capacity retention is 69.2% at 0.3 C and the resistance is only 25 Ω after 180 cycles. This is due to the graphene layer facilitates the interfacial charge-transfer process and slows the cathode/electrolyte interfacial side reaction. Consequently, the study illuminated the interface issues of PPC based solid-state lithium batteries.
研究领域:
材料科学
·
电化学
·
储能技术
·
固态电池
·
聚合物化学
✓ 已验证
DOI
NANOTECHNOLOGY
·
2021
·Vol. 32
·期 29
·295701
·
IF 3.874
Yalan Huang,He Zhu,Hekang Zhu,Jian Zhang,Yang Ren,Qi Liu
Layered LiNixCoyMn1-x-yO2 (NCM) is expected to dominate the future cathode technology of the automotive industry, due to its high energy density and low cost. Despite its excellent prospects, however, the severe capacity decay of NCM cathodes has prevented this promising material from achieving further success. The mechanism underlying this phenomenon is controversial and has been generally understood as arising from the complex structural changes that take place upon Li-(de)intercalation. However, deeper insight has not been available due to unclear structural kinetics, in particular, in cycled NCM cathodes. For this study, we conducted in situ high-energy synchrotron x-ray diffraction (XRD) measurements on a typical LiNi0.5Co0.2Mn0.3O2 (NCM523) cathode that had been operated for 90 cycles, then compared the results with those collected from a fresh NCM532 electrode. It was revealed that the H1–H2 phase transition that only occurs at the first cycle is irreversible. Remarkably, the c-contraction triggered by the H2-H3 transition, which is expected to be the major cause of intergranular cracks in electrodes, became even more profound after cycling. Combining the above results with electrochemical testing and microscopic imaging, we discuss the interplay between structural dynamics and performance degradation in NCM532 in detail. This study provides key evidence for a mechanically induced capacity decay mechanism, which is expected to be extended to NCM materials with various compositions.
研究领域:
材料科学
·
电化学
·
能源存储技术
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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）