ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Fang-Yu Tao,Xiao-Ying Zhang,Dan Xie,Wan-Yue Diao,Chang Liu,Hai-Zhu Sun,Xing-Long Wu,Wen-Liang Li,Jing-Ping Zhang
A lithium metal anode (LMA) is appealing due to its high theoretical capacity and low electrochemical potential. Unfortunately, the practical application of LMAs is restricted by the uncontrollable Li dendrite growth and tremendous volume change. Herein, lithiophilic honeycomb-like layered double hydroxide (LDH) nanosheet arrays supported on a flexible carbon cloth (NiMn-LDHs NAs@CC) are synthesized as the Li host to spatially confine the Li deposition, guiding Li growth via a conformal and uniform manner. First, the lithiophilic NiMn-LDHs NAs as nucleation seeds render the CC substance outstanding lithiophilicity and reduce the nucleation barrier. The hierarchical honeycomb-like structure then directs the oriented Li deposition and provides an open channel for fast ion transport. Finally, the CC skeleton offers a high specific surface for decreasing the inhomogeneous distribution of the current density and enough space for alleviating the volume variations, synergistically inhibiting the dendritic Li growth. As a consequence, the NiMn-LDHs NAs@CC symmetric cell exhibits a low overpotential of less than 17 mV at 2 mA cm–2 and a long lifespan of 2100 h at 3 mA cm–2. In addition, when paired with the LiNiCoMnO2 (NCM111) cathode, the NiMn-LDHs NAs@CC@Li full cell presents enhanced cycling stability and rate capability in comparison to the CC@Li full cell, implying the great potential of the NiMn-LDHs NAs@CC in stabilizing the LMA.
研究领域:
能源材料
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电化学
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电池技术
·
纳米材料
·
先进功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2012
·
IF 4.951
Jing Lin,Daobin Mu,Ying Jin,Borong Wu,Yunfeng Ma,Feng Wu
Li-rich layered composite Li[Li 0.2 Ni 0.2 Mn 0.6 ]O 2 is prepared by a novel approach in which carbon felt acts as a carrier for synthesis reaction . The as-prepared material is characterized by SEM, ICP and XRD , its electrochemical performance is also examined with galvanostatic charge/discharge and CV measurements. It is showed that the facile process controls effectively the particle growth (in size around 100–200 nm) of the composite and its chemical composition . The as-prepared material shows a high initial discharge capacity about 288 mAh g −1 when charged to 4.8 V, and a retained value of 246.8 mAh g −1 in the 40th cycle. The crystalline structure of the composite is simulated further by Material Studio. It is revealed that the composite has a compatible layer structure merged by Li 2 MnO 3 and LiNi 0.5 Mn 0.5 O 2 , which makes substantial contribution to the cycleability of the electrode. In addition, the lithiation/delithiaion properties including charge transfer resistance and lithium ion diffusion coefficient are studied with electrochemical impedance spectra.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Chunyan Xiong,Kang Kan,Ziyun Xie,Chengchong Wang,Xiaolei Li,Yuanlai Xu,Yafen Dai,Jiangman Sun,Jiajun Gao,Bin Shan,Jian Pu
Recovery of high-valued metals such as Li and Co from spent Li-ion batteries is quite important for sustainability reasons. The novelty of this work was based on the view of molecular design, proposing a strategy that inserts another group between two −COOH groups on an organic acid to activate them. On this basis, a novel solvent dicarboxylated polyethylene glycol (dcPEG), i.e., HOOC–CH2(CH2CH2O)nCH2–COOH, was chosen to leach Li and Co from LiCoO2. Expectedly, HOOC–CH2(CH2CH2O)nCH2–COOH (n = 250), which was denoted as dcPEG250, showed appealing leaching performance without the help of H2O2 and quaternary ammonium salt. It can simultaneously extract Co and Li, and the leaching efficiency reached as high as almost 100% under the proper conditions. The excellent performance was ascribed to structural feature of dcPEG. The presence of main chain (CH2CH2O)n extended the distance between two −COOH groups at the ends, limited their intramolecular interaction, and activated the −COOH groups. Accordingly, the active H atom on the −COOH group can react with LiCoO2, and the active O atoms on ether (C–O–C) and carbonyl (C═O) groups can coordinate with metals. In a word, this work could not only provide a promising solvent but also inspire researchers to engineer more novel solvents from the view of molecular design.
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Zhengfu Qiu,Liyi Shi,Zhuyi Wang,Jonas Mindemark,Jiefang Zhu,Kristina Edström,Yin Zhao,Shuai Yuan
This paper proposes a strategy to fabricate surface activated polyethylene (PE)-supported gel polymer electrolyte (GPE) with high ion transport ability, excellent electrolyte retention and mechanical properties to stabilize lithium (Li)-metal anodes. The inert outer and inner pore surface activation of polyethylene is demonstrated by coating an ultrathin zirconium oxide nanocrystal (ZrO 2 )/polyhedral oligomeric silsesquioxane (POSS) composite layer through a simple layer by layer (LBL) assembly method prior to the in situ polymerization. It is found that the activation layer may improve the Li + ion transference number and induce the formation of GPE with a gradient structure by the interaction with the initiator system, giving rise to higher ion transport ability of final GPE. On the other hand, the GPE using the activated PE separator as support improves the Li/electrolyte interfacial stability during storage and repeated lithium plating/stripping cycling. A stable voltage profile with cycling for more than 800 h in a Li/Li symmetric cell was obtained by using surface activated PE-supported GPE. When it is assembled into the cells with metallic lithium anodes and lithium cobalt oxide (LiCoO 2 ) cathodes, the cells show excellent rate capability and cycling performance, as well as effective dendrite inhibition.
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
·
2023
·Vol. 11
·期 14
·7564-7571
·
IF 11.9
Yechen Si,Yunhao Jiang,Jiayi Liu,Hongyu Guan,Xing-Long Wu,Changsheng Shan
It is a huge challenge to develop safe and stable lithium metal batteries with high energy density owing to the growth of Li dendrites. Herein, for the first time, an oxidized ZIF-8/polyacrylonitrile (OZPAN) fiber film is designed as a multifunctional interlayer for constructing a novel Li metal battery with superior performance. The excellent lithophilicity and uniform porous structure of the OZPAN interlayer could anchor and regulate Li-ion flux with high ionic conductivity (2.22 mS cm−1), high Li+ transference number (0.78) and homogeneous Li deposition. Therefore, the Li//Li symmetric cell exhibits ultralow overpotential (11 mV) with long-term cycling stability and dendrite-free Li deposition. Moreover, Li//LiFePO4 (LFP) full cell has an extremely high capacity (162 mA h g−1 at 1C, close to the theoretical specific capacity of LFP), outstanding rate performance and high coulombic efficiency (more than 94%) during 500 cycles. This study demonstrates a promising interlayer strategy for developing high-performance Li metal batteries.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 30
·16087-16094
·
IF 14.511
Cun Song,Zhengang Li,Jun Peng,Xiaohong Wu,Hao Peng,Shiyuan Zhou,Yu Qiao,Hui Sun,Ling Huang,Shi-Gang Sun
Solid polymer electrolytes (SPEs) could effectively enhance energy density and safety of Li-metal batteries (LMBs). Poly(ethylene oxide) (PEO)-SPEs exhibit excellent properties at elevated temperature (>70 °C), while their insufficient ionic conduction at room temperature yields nonnegligible mass transfer polarization. Such a polarization of SPEs in LMBs will lead to huge capacity loss, affect rate performance, cause Li dendrite growth that initiates safety problems, and significantly limit the battery lifespan. Herein, we have developed a method for improving the transfer efficacy of Li+ in PEO electrolyte through the construction of composite PEO with Li6.4La3Zr1.4Ta0.6O12 (LLZTO)/fluorinated carbonate (FEC) and succinonitrile (SN) (denoted as PLFS). By means of the decomposition reaction between LLZTO and FEC, interfacial compatibility between LLZTO and PEO has been improved, and fluorinated oligomers generated in the decomposition of FEC can simultaneously fix anions by the ‘fluorous effect’. Furthermore, SN with a lower Gutmann donor number is used to composite with PEO/FEC/LLZTO to weaken the strong complexation between Li+ and PEO. The construction of a fast Li+ transfer channel as well as the weakened interaction of Li+ to PEO is achieved, which facilitates the migration of Li+ of PEO-SPEs. Benefiting from the above design, composite PLFS-SPEs present an excellent Li+ transfer efficacy that is 41 times higher than that of pure PEO-SPEs, and significantly enhances rate performance and cycling life of LMBs. The Li/PLFS-SPEs/Li symmetric battery demonstrates a lifespan of more than 1100 h at room temperature. When PLFS-SPEs are applied in LMBs, the Li/PLFS-SPEs/LiFePO4 battery can maintain nearly 80% of its initial capacity after 700 cycles at 1C.
✓ 已验证
产品关联
DOI
高影响因子
Energy & Environmental Materials
·
2021
·Vol. 5
·期 1
·327-336
·
IF 15.122
Huajun Zhao,Jun Wang,Huaiyu Shao,Kang Xu,Yonghong Deng
Gas generation induced by parasitic reactions in lithium-metal batteries (LMB) has been regarded as one of the fundamental barriers to the reversibility of this battery chemistry, which occurs via the complex interplays among electrolytes, cathode, anode, and the decomposition species that travel across the cell. In this work, a novel in situ differential electrochemical mass spectrometry is constructed to differentiate the speciation and source of each gas product generated either during cycling or during storage in the presence of cathode chemistries of varying structure and nickel contents. It unambiguously excludes the trace moisture in electrolyte as the major source of hydrogen and convincingly identifies the layer-structured NCM cathode material as the source of instability that releases active oxygen from the lattice at high voltages when NCM experiences H2 → H3 phase transition, which in turn reacts with carbonate solvents, producing both CO 2 and proton at the cathode side. Such proton in solvated state travels across the cell and becomes the main source for hydrogen generated at the anode side. Mechanisms are proposed to account for these irreversible reactions, and two electrolyte additives based on phosphate structure are adopted to mitigate the gas generation based on the understanding of the above decomposition chemistries.
研究领域:
电化学
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储能
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电池技术
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材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2018
·
IF 6.945
Guibin Li,Xin Chen,Lixiao Miao,Jitao Chen,Junrong Zheng
Most Li-metal batteries can work safely only under 45 °C and have risks of burning or explosion. A novel nonflammable Li-battery is developed to address the challenge, using an interpenetrating rigid-flexible poly (aryl-ether-ketone) nonwovens (PAEKNW) cross-linked with poly(ethylene glycol) dimethacrylate electrolyte to transport lithium ions . The hybridized polymer electrolyte possesses a high ionic conductivity of 1.2 × 10 −3 S cm −1 at room temperature and a wide electrochemical window with decomposition voltage higher than 4.5V. It does not readily catch fire or shrink, even under open flame, and shows no noticeable volumetric expansion or contraction at 80 °C, in stark contrast to most liquid-electrolytes-based or gel batteries. Even after cut off by one-third, the battery continues to function. The unique bi-functional molecular design of the polymer electrolyte, which guarantees simultaneously a very rare combination of thermal and mechanical stability, high ion conductivity, and a wide electrochemical window at room temperature, is the key factor responsible for the excellent comprehensive performances.
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
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2013
·Vol. 18
·期 3
·739-745
·
IF 2.279
Song Ming,Zhu Ding,Zhang Lei,Wang Xiaofei,Mi Rui,Liu Hao,Mei Jun,Lau Leo W. M.,Chen Yungui
Discharge/charge characteristics of Li–O 2 batteries at a test temperature of 343 K, using Super P carbon electrodes, have been explored in this paper based on ether-based electrolytes. Compared with ambient temperature, high temperature significantly influences the discharge/charge process of Li–O 2 batteries since discharging capacity increases at about 80 % and charging voltage plateau decreases from 4.2 to 3.5 V. The stability of stainless steel mesh with electrolyte at 343 K has been researched using cyclic voltammetry. This paper lays the bases for further research on Li–O 2 batteries in high-temperature areas.
研究领域:
电化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Sustainable Energy & Fuels
·
2024
·
IF 5
Genxi Yu,Youchun Wu,Dawei Sha,Jianwen Cai,Gaofa Nie,Yaping Wang,Long Pan,ZhengMing Sun
Garnet solid-state electrolytes (SSEs) have extraordinary application prospects due to their high room temperature ionic conductivity and high stability to lithium metal. However, when exposed to air during the preparation process, contaminants are inevitably generated on the electrolyte surface, resulting in poor wettability of the Li/garnet interface and high interfacial resistance. Moreover, solid-state batteries assembled with contaminated electrolytes can easily lead to the formation and expansion of lithium dendrites. Herein, we demonstrate a surface chemistry strategy of rapid vulcanization treatment to improve interface problems by introducing lithium sulfides into the garnet electrolyte. Compared to the surface contaminants (e.g., Li2CO3) on garnet, lithium sulfides (e.g., Li2S) have several advantages; it is a good Li+ conductor and has good wettability to both the garnet surface and Li metal anode. The interfacial resistance of the vulcanized garnet-SSE pellets decreased from 2961 Ω cm2 for LLZT@LC to 391 Ω cm2 for LLZT@LS. In addition, the lithium symmetric battery assembled by using LLZT@LS pellets exhibits stable plating/stripping cycling performance and ultralow overpotential at a current of 0.2 mA cm−2 without Li dendrite growth. Moreover, the LiFePO4/Li batteries with LLZT@LS pellets show excellent rate performances and cycling stability (114.3 mA h g−1 @ 0.5C after 150 cycles) with a capacity retention of 86%. These results demonstrate that the rapid treatment of garnet contaminants by a surface chemistry strategy is not only a simple and efficient solution but also provides strong support for the realization of high-performance solid-state lithium metal batteries (SSLMBs).
研究领域:
材料科学
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电化学
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能源存储
·
电池技术
✓ 已验证
产品关联
DOI
高影响因子
Advanced Science
·
2024
·
IF 14.3
Wenze Wang,Qian Zhang,Liting Yang,Guisheng Liang,Xuhui Xiong,Yifeng Cheng,Limin Wu,Chunfu Lin,Renchao Che
High-entropy materials (HEMs) are extremely popular for electrochemical energy storage nowadays. However, the detailed effects of four core factors of high entropy on the electrochemical properties of HEMs are still unclear. Here, a high-entropy La 1/4 Ce 1/4 Pr 1/4 Nd 1/4 Nb 3 O 9 (HE-LaNb 3 O 9 ) oxide is prepared through multiple rare-metal-ion substitution in LaNb 3 O 9 , and uses HE-LaNb 3 O 9 as a model material to systematically study the effects of the four core factors of high entropy on electrochemical energy-storage materials. The high-entropy effect lowers the calcination temperature for obtaining pure HE-LaNb 3 O 9 . The lattice distortion in HE-LaNb 3 O 9 leads to its decreased unit-cell-volume variations, which benefits its cyclability. Based on the restrained diffusion arising from the lattice distortion, the Li + diffusivity of HE-LaNb 3 O 9 at room temperature (25 °C) is limited, which causes its lowered rate capability. However, the Li + diffusivity of HE-LaNb 3 O 9 at high temperature (60 °C) becomes faster than that of LaNb 3 O 9 , which is attributed to the alleviated lattice distortion at the high-temperature, resulting in higher rate capability. The cocktail effects in HE-LaNb 3 O 9 enable its larger electronic conductivity, better electrochemical activity, more intensive Nb 5+ ↔ Nb 3+ redox reaction, and larger reversible capacity. The insight gained here can provide a guide for the rational design of new HEMs with good energy-storage properties.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Xingyi Shi,Qingwei Sun,Bismark Boateng,Yinghua Niu,Yidong Han,Weiqiang Lv,Weidong He
The safety of lithium ion batteries is correlated closely to the mechanical property and thermal stability of separators. The polymer/ceramic particle composite separators are widely investigated for quasi-solid gel separators of lithium ion batteries, but the nonuniform dispersion of ceramic particles limits their performance. In this study, ball-milled Al-doped Li 6.75 La 3 Zr 1.75 Ta 0.25 O 12 suspension is incorporated into poly (vinylidene fluoride- co -hexafluoropropylene) gel to prepare a highly uniform quasi-solid composite separator. The results show that adding only 4.29 wt% Li 6.75 La 3 Zr 1.75 Ta 0.25 O 12 into PVDF-HFP increases ductility by three times and the mechanical strength by 38% as compared with pure PVDF-HFP separator. Batteries with the composite separator show significantly improved cyclic stability and rate performance at both room temperature and temperatures up to 80 °C. In particular, the composite separator promotes homogenous Li + flux through the separator and suppresses Li dendrite growth in Li-metal based batteries.
研究领域:
材料科学
·
电化学
·
电池技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）