Energy Technology
·
2022
·Vol. 10
·期 12
·2200800
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IF 4.149
Haoxiang Zhong,Qianqian Hu,Lingzhi Zhang
The shuttle effect of polysulfides severely limits the practical application of lithium–sulfur batteries. Herein, the lithium-rich Li[Li 0.2 Ni 0.2 Mn 0.6 ]O 2 /hierarchical porous graphitic carbon composite (LLNM/HPGC) is designed and synthesized as host material for lithium–sulfur batteries, aiming to restrict the shuttle effect of polysulfides via physical entrapment from 3D HPGC and accelerate the conversion of polysulfides from the lithium-rich LLNM as catalyst. Benefiting from the well-constructed host framework, 1glycerinum-LLNM/2HPGC@sulfur (1Gly-LLNM/2HPGC@S) shows higher specific capacity of 651 mAh g −1 after 200 cycles at 0.5C than that of 546.3, 422.8, 476, and 421.7 mAh g −1 for HPCG@S, Gly-LLNM@S, 1Gly-LLNM/3HPGC@S, and 1Gly-LLNM/5HPGC@S. Therefore, this work demonstrates a promising route to inhibit the shuttle effect of polysulfides for lithium–sulfur batteries.
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高影响因子
JOURNAL OF RARE EARTHS
·
2022
·
IF 4.632
Yuxing Bai,Liwei Wu,Qilin Cheng,Li Wu,Yongfa Kong,Yi Zhang,Jingjun Xu
Thermal stability is a crucial index to assess application value of high-power LEDs, which is related to lattice defects. Herein, an effective structure - engineering strategy is proposed to achieve excellent properties. Under the 394 nm excitation, Cs 3 Zn 5.94 B 9 O 21 :0.06Eu 3+ possesses two characteristic emissions peaked at 591 and 612 nm with limited thermal stability. By introducing Li + ions into the lattice, the sample exhibits high color purity and excellent zero-thermal quenching because the defect contents of the phosphor can be effectively modulated via charge-compensation effect. Then, under the stimulus of high temperature, the corresponding trap levels with a suitable depth ( E = 1.27 eV) will release electrons to recombine with the luminescent centers, compensating for the energy loss. The study provides a meaningful guide for optimizing and designing novel functional photoluminescent materials.
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高影响因子
HYDROMETALLURGY
·
2022
·
IF 4.217
Ruibing Bai,Junfeng Wang,Daoguang Wang,Junjie Cui,Yanqiang Zhang
In view of the complex problems for the ionic liquids (ILs) recovery with the system containing ILs and TBP, this work proposed a NaNTf 2 -based synergistic extraction system, NaNTf 2 + TBP, which could realize the effective reutilization of the extraction system without reducing the lithium separation ability. Under the optimal extraction parameters, the extraction efficiency of Li + exceeded 98%, while that of Mg 2+ was only ~1%. The results of mass spectrometry (ESI-MS) and slope analysis showed that two TBP molecules involved in the extraction process of Li + , and the Li + extraction mechanism obeyed the cation-exchange process. According to the red shift of the FT − IR peak of P O in TBP and the chemical shift changes of P in 31 P NMR, the interaction strength between TBP and different metal ion followed the sequence: E TBP−H >> E TBP−Li > E TBP−Mg > E TBP−K > E TBP−Na . It was also found that after a three−stage countercurrent extraction process, [Li + ] org was 0.42 g L −1 , and the total recovery efficiency of Li + was about 98%. The saturated extraction capacity for Li + could be as high as 5.4 g L −1 , and Li + could be stripped with the aqueous solution containing 0.2 mol L -1 HCl. In addition, the extraction efficiency of Li + was almost not attenuated after 6 extraction cycles. This new extraction system shows a certain industrial application prospect for Li + separation from the salt lake bine with high Mg/Li ratio.
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高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Bingying Zhu,Xiaotang Shi,Tianle Zheng,Jianwei Xiong,Ya-Jun Cheng,Yonggao Xia
Lithium secondary battery with a wide working temperature range is crucial to boost its increasing applications in harsh circumstances. Suppressing excessive electrolyte decomposition at high temperatures while maintaining reasonable electrochemical kinetics at low temperatures is critical for wide-temperature electrochemical performance. Construction of high temperature stable electrode-electrolyte interface layer by electrolyte formulation is an effective strategy to prevent electrolyte from uncontrollable decomposition. On the contrary to conventional thinking, propylene carbonate (PC) bearing poor filming ability to suppress electrolyte decomposition is used in this work to promote decomposition of the single lithium difluoro(oxalate)borate (LiODFB) salt in the electrolyte, producing inorganic-rich interface layer with good structure stability over a wide temperature range. Glutaronitrile (GLN) is further utilized to minimize the decomposition of PC by expelling PC out of the solvation sheath of lithium-ion. The teamwork of LiODFB, PC, and GLN makes a synergistic contribution to building a high-temperature stable electrode-electrolyte interface layer at both LFP and MCMB electrodes. Based on the approach developed in this work, the temperature window is successfully expanded to the range of from -40 °C to 140 °C. Excellent electrochemical performance is exhibited by both LFP/Li and MCMB/Li cells from -20 °C to 100 °C in terms of reversible capacity and cyclic stability.
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高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Qian-Cheng Zhu,Zi-Rui He,De-Yu Mao,Wan-Ni Lu,Sheng-Long Yi,Kai-Xue Wang
Li–CO2 batteries with high theoretical energy densities are recognized as next-generation energy storage devices for addressing the range anxiety and environmental issues encountered in the field of electric transportation. However, cathode catalysts with unsatisfactory activity toward CO2 absorption and reduction/evolution reactions hinder the development of Li–CO2 batteries with desired specific capacities and sufficient cycle numbers. In this work, a multifunctional nanofibrous cathode catalyst that integrates N-rich carbon shells embedded with molybdenum carbide nanoparticles and multiwalled carbon nanotube cores was designed and prepared. The N-rich carbon shell could strengthen the absorption capacity of CO2 and Li2CO3. The molybdenum carbide nanoparticles would improve the catalytic activity of both CO2 reduction and evolution reactions. The carbon nanotube cores would provide an efficient network for electron transportation. The synergistic effect of the cathode catalysts enhances the electrochemical performance of Li–CO2 batteries. A high cycling stability of more than 150 cycles at a current density of 250 mA g–1 with a cutoff capacity of 1000 mAh g–1 and a charge/discharge overpotential of less than 1.5 V is achieved. This work provides a feasible strategy for the design of a high-performance cathode catalyst for lithium–air batteries.
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jiamei Lai,Chunhai Jiang,Zhimin Zou
Nanosized oxygen-deficient orthorhombic niobium pentoxide (Nb 2 O 5-x ) that possess high electronic conductivity and stable cycle performance for Li storage are uniformly deposited on the surface of mesophase carbon microspheres (MCMB), which as a whole exhibits very encouraging electrochemical Li ion storage performance, including a high specific capacity of 107 mAh g −1 at 10C (1C = 372 mA g −1 ) and a high capacity retention of 85.4 % after 300 cycles at 3C in the optimized case. The Li + diffusion coefficient of the composite anode as determined by the potentiostatic intermittent titration technique (PITT) is obviously improved as compared to that of pristine MCMB. Ex situ X-ray diffraction characterizations confirm the phase transformation from orthorhombic Nb 2 O 5-x to amorphous Li y Nb 2 O 5-x accompanied by the formation of NbO through a conversion reaction in the first lithiation process. The ultrafast Li + diffusion within the amorphous Li y Nb 2 O 5-x as well as the current-sharing effect of the secondary particles can explain the much enhanced Li ion storage property. The results of this work convincingly demonstrate that designing MCMB/Nb 2 O 5-x composite can be a more practical way to improve the energy and powder densities of Li-ion batteries rather than seeking alternative anode materials with higher capacities.
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高影响因子
Advanced Energy Materials
·
2022
·Vol. 12
·期 37
·2201734
·
IF 29.698
Qi Li,Jun Zhang,Lixiang Zhong,Fushan Geng,Ying Tao,Chuannan Geng,Shuzhou Li,Bingwen Hu,Quan-Hong Yang
Hard carbons have been identified as competitive anodes for Li/Na/K-ion batteries but their Li/Na/K-ion storage mechanisms significantly vary in different batteries. It is fundamental to understand the basic science behind the difference. Herein, it is theoretically revealed that defects on the carbon layers generally have an influential impact on the atomic interactions including the metal–metal (M–M) and metal–carbon (M–C) interactions, thereby determining whether the stored alkali-metal atoms are in ionic or quasi-metallic states. Upon increasing the number of metal atoms on a carbon layer composed of only hexatomic rings, K tends to be stored in an ionic state similar to Li due to the dominant M–C interaction, while on a carbon layer with defects, K tends to be stored in a quasi-metallic state similar to Na due to the dominant M–M interaction. For experimental verification, a glassy carbon, the extreme form of hard carbon with dominant sp 2 hybridization and only Stone–Wales defects, is selected as a model anode, and its Li/Na/K-ion storage mechanisms are exactly consistent with the theoretical prediction. More profoundly, for the first time, the quasi-metallic K cluster information is captured by ex situ electron paramagnetic resonance.
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高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2022
·
IF 6.633
Junyuan Hua,Xiaohua Ma,Wenhui Ji,Quan Li,Benqiao He,Zhenyu Cui,Xiaoping Liang,Feng Yan,Jianxin Li
Ionic liquids (ILs) based liquid-liquid extraction (LLE) is one of the most efficient and green techniques for mining Li from salt lake brines, however, the extraction mechanism still needs to be clarified. Here, tributyl phosphate (TBP) and four kinds of ILs were used as extractant/co-extractant for recovering Li from Mg 2+ /Li + aqueous solution. The extraction conditions including the IL selection, IL/TBP ratio, Li + concentration and Li + /Mg 2+ ratio were analyzed in detail. A Li + recovery of 65.3 % and Li + /Mg 2+ separation factor of 68.4 at the Li + /Mg 2+ ratio of 1/50 wt% were achieved. This high Li extraction efficiency and Li + /Mg 2+ selectivity were analyzed by in-situ FTIR and 31 P NMR, the results turned out that this is attributed to the strong interactions between Li + and TBP/[NTf 2 ] − , and much larger than that of Mg 2+ . This strong interaction facilitated the [C 4 mim] + cation in IL exchange with Li + between organic and aqueous phase that finish the extraction process, which was further proved by EDX and XPS results. Additionally, the binding energy of the extraction intermediates were calculated by density functional theory (DFT), and the most stable one is 3TBP•Li•H 2 O•NTf 2 , suggesting one H 2 O combined with Li + enter into the organic phase during the extraction. As a result, the Gibbs free energy of the extraction between Li + and ILs/TBP mixture can be obtained to be −132.2 kJ mol −1 . In summary, our work showed an in-depth understanding of the extraction mechanism and provides guidelines for the ionic liquids-based Li extraction process in the future.
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高影响因子
ChemElectroChem
·
2022
·Vol. 9
·期 9
·e202200301
·
IF 4.782
Shuang Xia,Wen Huang,Wenqi Yan,Xinhai Yuan,Xi Chen,Lili Liu,Lijun Fu,Yusong Zhu,Qinhong Huang,Yuping Wu,Teunis van Ree,Rudolf Holze
Graphical Separators for advanced Li−S batteries were prepared using spherical rutile TiO 2 with oxygen vacancies and three-dimensional interconnected graphene-like carbon. As an advanced energy-storage system, Li−S batteries have attracted much attention, but there is still a series of problems hindering their commercialization, such as the ‘shuttle effect’ and corrosion of lithium anodes. To alleviate these two important problems simultaneously, we modified the separators with spherical rutile TiO 2 with oxygen vacancies (abbreviated OT) and three-dimensional interconnected graphene-like carbon (abbreviated GC) for advanced Li−S batteries to improve the electrochemical performance. The modified separators (abbreviation OTCD) have low charge transfer impedance, a catalytic effect on polysulfides, and a barrier effect on polysulfides, which can suppress the ‘shuttle effect’ and prevents the corrosion of lithium anodes in Li−S batteries. The as-prepared Li−S batteries show good cycling stability for 250 cycles with 0.048 % capacity decay per cycle at 1 C. Moreover, the SEM images of lithium anodes after 50 cycles showed that the lithium anodes were uncorroded. This work provides a practical and effective reference for the advanced Li−S batteries.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yun Zhao,Shuo Chen,Mengxin Guan,Bin Ding,Jianyong Yu,Jianhua Yan
The high reactivity of Li-anodes and the easily separated solid-state interface are two hurdles for constructing stable solid-state Li-metal batteries (SSLBs). Herein, we report a 3D mixed ion–electron conductive (MIEC) Li anode with deformable molten interphase of poly(Ɛ-caprolactone) electrolytes that is highly efficient towards constructing stable SSLBs. The 3D Li anode is fabricated by integrating a Li foil with a MIEC film via a facile hot-rolling process, in which the MIEC frame is composed of Li 0.33 La 0.56 TiO 3 particle attached carbon nanofibers . We propose that the chemical reactions between Li 0.33 La 0.56 TiO 3 and Li facilitates Li-nucleation inside the MIEC frame and thus enables fast stress relaxation and reduces volume fluctuations, while the molten interphase works as a binder to integrate the anodes and electrolytes without delamination during cycling. As a result, the symmetrical batteries run stably for 1200 h at 45 ℃, and the 3D Li/LiFePO 4 full batteries achieve a capacity of 134 mA h g −1 at 1C with a high-capacity retention of 98 % after 250 cycles, showing appealing commercial prospect.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Jianghai Wei,Xuewen Zheng,Weiteng Lin,Yu Si,Kemeng Ji,Chengyang Wang,Mingming Chen
Solid polymer electrolytes (SPEs) based solid-state lithium metal batteries (SSLMBs) are widespreadly practiced as one of the main technical routes aiming for chemically essential safety with acceptable energy density . However, uncontrollable Li dendrites growth and sluggish Li + transport remain obstacles to the further development of SPEs-based SSLMBs. Herein, a porous g-C 3 N 4 (PCN) is designed and introduced into polyethylene oxide (PEO). Within the following synthesized PEO-based composite solid electrolyte (PEO/PCN/LiTFSI CSE), PCN is found to be an attractive multifunctional filler. For its porous morphology and high specific surface area, abundant Lewis basic active sites are exposed, which facilitates Li + to be uniformly distributed in PEO/PCN/LiTFSI CSE and thus more effectively mitigates the Li dendrites growth comparing to those with bulk g-C 3 N 4 filler, making PCN-involved Li symmetrical cell (Li|PEO/PCN/LiTFSI|Li) run steadily for 1400 h under the current density of 0.1 mA cm −2 at 60 °C. PCN also accelerates Li + transport in the manner of reducing PEO crystallinity and promoting LiTFSI dissociation. The Li + conductivity of PEO/PCN/LiTFSI CSE reaches 3.47 × 10 −4 S cm −1 at 60 °C. Therefore, long life span and high rate performances are together achieved in SSLMB assembled with PEO/PCN/LiTFSI CSE. This work reveals a feasible strategy to fabricate dendrite-free SSLMBs cycling within a fairly long time.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Rupeng Zhang,Can Cui,Rang Xiao,L. Ruinan,Tiansheng Mu,Hua Huo,Yulin Ma,Geping Yin,Pengjian Zuo
The Mg-metal batteries (MMBs) as a forceful competitor for Li-metal batteries (LMBs) have the advantages of high-safety and high-volume energy density . Whereas, the MMBs still confronts two vital issues to be addressed, including the incompatibility of conventional TFSI-based electrolytes with the Mg electrode and the poor reversibility of the cathode. In this work, to satisfyingly settle the incompatibility, an artificial interphase was first pre-constructed by high-temperature displacement reaction of CuCl 2 and Mg metal, responsible for the faster charge-transfer rate and the lower Mg plating/stripping overpotential (∼0.2 V) in Mg symmetric cells. Regarding the Mg-Mo 6 S 8 full cells, to enhance the reversibility and rate performance, Mg/Li hybrid batteries were designed. Consequently, the Mg-Mo 6 S 8 battery can achieve excellent cycle stability and deliver a desirable capacity. Even as the current density increases to 1C, the battery still shows a desirable capacity of 92 mAh g −1 over 500 cycles.
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高影响因子
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