ACS Applied Materials & Interfaces
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2017
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IF 7.504
Li Li,Lecai Wang,Xiaoxiao Zhang,Qing Xue,Lei Wei,Feng Wu,Renjie Chen
In this study, a hard-templating route was developed to synthesize a 3D reticular Li1.2Ni0.2Mn0.6O2 cathode material using ordered mesoporous silica as the hard template. The synthesized 3D reticular Li1.2Ni0.2Mn0.6O2 microparticles consisted of two interlaced 3D nanonetworks and a mesopore channel system. When used as the cathode material in a lithium-ion battery, the as-synthesized 3D reticular Li1.2Ni0.2Mn0.6O2 exhibited remarkably enhanced electrochemical performance, namely, superior rate capability and better cycling stability than those of its bulk counterpart. Specifically, a high discharge capacity of 195.6 mA h g–1 at 1 C with 95.6% capacity retention after 50 cycles was achieved with the 3D reticular Li1.2Ni0.2Mn0.6O2. A high discharge capacity of 135.7 mA h g–1 even at a high current of 1000 mA g–1 was also obtained. This excellent electrochemical performance of the 3D reticular Li1.2Ni0.2Mn0.6O2 is attributed to its designed structure, which provided nanoscale lithium pathways, large specific surface area, good thermal and mechanical stability, and easy access to the material center.
研究领域:
材料科学
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电化学
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电池技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS RESEARCH BULLETIN
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2015
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IF 2.288
Qingtang Zhang,Juntao Mei,Xiaolong Xie,Xiaomei Wang,Junyan Zhang
Lithium-rich layer oxide Li 1.2 Ni 0.2 Mn 0.6 O 2 nanoparticles were fabricated through solution combustion synthesis by controlling NO 3 – /CH 3 COO – ratio of the precursors. The relationships between the NO 3 – /CH 3 COO – ratio and structure as well as electrochemical performance of Li 1.2 Ni 0.2 Mn 0.6 O 2 nanoparticles are investigated. XRD reveals that Li 1.2 Ni 0.2 Mn 0.6 O 2 nanoparticles obtained with a suitable NO 3 – /CH 3 COO – ratio of 3:1 (LLO-3N1A) is composed of the smallest nanocrystallite of 18 nm. SEM reflects that the average primary particles of LLO-3N1A are the smallest with a size of 35 nm. Those unique characteristic guarantee the excellent electrochemical performance of LLO-3N1A. LLO-3N1A exhibits a specific capacity of 252.3 mA h g −1 at 0.1 C. In addition, LLO-3N1A also shows best rate capability among the four prepared Li 1.2 Ni 0.2 Mn 0.6 O 2 samples.
✓ 已验证
DOI
高影响因子
Journal of Energy Chemistry
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2025
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IF 14.9
Yinxuan Liang,Guohuang Kang,Yanru Liu,Jinhui Zhang,Yao Lv,Kangning Cai,Yilei Zhang,Feiyu Kang,Yidan Cao
Lithium-rich manganese-based cathode materials, as promising candidates for next-generation high-energy-density lithium-ion batteries due to their high specific capacity (>250 mAh g −1 ) and cost-effectiveness, are limited by severe capacity decay and voltage fade driven by irreversible structural transitions and oxygen release during cycling. Here, we report a Ti/Si dual-element modification strategy for cobalt-free Li 1.2 Ni 0.2 Mn 0.6 O 2 (LNMO) cathodes. The Ti/Si co-modified TS-LNMO cathode demonstrates superior structural stability and electrochemical performance. Bulk Ti 4+ doping stabilizes the oxygen framework via robust Ti–O bonds and enhances the lattice oxygen redox reversibility, while an in situ formed Li 2 SiO 3 layer suppresses interfacial side reactions, enhances lithium-ion diffusion, and prevents HF-induced erosion. As a result, the TS-LNMO cathode achieves 90% capacity retention after 200 cycles at 0.5 C and maintains ∼80% capacity in full cells cycled to 4.8 V. Additionally, the TS-LNMO cathode exhibits impressive rate performance even at a high rate of 5 C. This work offers an effective strategy for advancing cobalt-free, high-performance lithium-rich cathodes for sustainable energy applications.
研究领域:
材料科学
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电化学
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储能技术
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锂离子电池
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2017
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IF 3.133
Zhongdong Peng,Ying Li,Ke Du,Yanbin Cao,Guorong Hu
In order to improve the electrochemical performance of LiMn 2 O 4 at elevated temperatures, a series of Li 1.2 Ni 0.2 Mn 0.6 O 2 -modified LiMn 2 O 4 samples have been synthesized by a facile sol-gel method. The structure and morphology of pristine and modified LiMn 2 O 4 are investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. The Li 1.2 Ni 0.2 Mn 0.6 O 2 coating layer is identified by transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS), which plays an important role in reducing the dissolution of manganese, thereby improving the cycle performance and rate capability of the material. The 2 wt% Li 1.2 Ni 0.2 Mn 0.6 O 2 -modified LiMn 2 O 4 sample exhibits a higher capacity retention of 95.88% than that of the pristine one (81.2%) after 200 cycles at 1C and 25 °C. Furthermore, a capacity retention of 89.74% is obtained for the 2 wt%-modified LiMn 2 O 4 sample after 200 cycles at 1C and 55 °C, compared to 66.34% for the pristine one. Surface modification with a Li-rich Li 1.2 Ni 0.2 Mn 0.6 O 2 material is a good way to improve the elevated temperature performance of LiMn 2 O 4 .
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Pingping Chen,Qinghui Zeng,Qingyuan Li,Ruihua Zhao,Zhenfeng Li,Xin Wen,Wen Wen,Yu Liu,Anqi Chen,Zengxi Li,Xiangfeng Liu,Liaoyun Zhang
Solid-state polymer electrolytes (SPEs) have gained considerable attention in the application of all-solid-state lithium batteries (ASSLBs), but the low ionic conductivity at room temperature and inferior interfacial compatibility largely drag the practical development of SPEs. Herein, a ketone-containing poly(allyl acetoacetate) (PAAA) based polymer electrolyte is designed and prepared for the first time. The structure of ester and ketone groups provides PAAA polymers with not only strong dissociation of lithium salts but also weak coordination interactions with Li + ions. Thus the prepared PAAA polymer electrolytes show excellent ion conductive behavior with ionic conductivity as high as 1.1 × 10 -4 S cm −1 at 30 °C. Moreover, the PAAA polymer electrolytes still maintain superior viscoelasticity without compromising mechanical integrity. When assembling cells, the reduction-tolerant poly(ethylene oxide) (PEO) polymer electrolytes are employed as interlayers between the PAAA SPEs and lithium electrodes in order to improve interfacial stability. As a result, the hierarchical polymer electrolytes possess wide electrochemical window above 4.8 V, thus matching well with LiFePO 4 or Li 1.2 Ni 0.2 Mn 0.6 O 2 high-voltage cathode. The hierarchical structure does not affect interfacial contact, and the Li/PEO-PAAA-PEO/Li cells show low interfacial resistance and stable striping/plating behavior for at least 500 h at 0.2 mA cm −2 and 60 °C. This study enriches carbonyl-based polymer electrolytes by allying ketone with ester groups, and provides guidance for designing novel high-performance polymer electrolytes for practical application.
研究领域:
材料科学
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电化学
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电池技术
✓ 已验证
DOI
高影响因子
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