CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Longqing He,Zhiwei Luo,Haozhang Liang,Nanshan Ma,Xinzhu Liu,Xiaofeng Wang,Ziyou Zhou,Anxian Lu
Li 2 O–ZnO–B 2 O 3 -WO 3 (LZBW) sealing glasses for Si substrates were prepared and the effect of WO 3 on the structure, thermal properties, and sintering behaviour was investigated. As the WO 3 increases from 0 to 12 mol%, the glass transition temperature and softening temperature reach the lowest values of 448 °C and 479 °C, respectively, at which time the glass network has the lowest degree of polymerization. The thermal expansion coefficient increases from 6.959 × 10 −6 /°C to 8.476 × 10 −6 /°C with increasing WO 3 contents. It is verified that the introduction of WO 3 can effectively improve the conductivity. The sealing property of the glasses was evaluated by the wetting angle of the glasses after co-sintering with Si substrate for 10 min at 860 °C, and the 25Li 2 O-7ZnO-2.7Bi 2 O 3 -1.3P 2 O 5 -55B 2 O 3 -9WO 3 glass had the minimum wetting angle of 34.07°. The excellent thermal properties, conductivity, and wetting behaviour of the LZBW glasses make it a potential material as a binder material for positive silver pastes.
研究领域:
材料科学
·
无机非金属材料
✓ 已验证
产品关联
DOI
高影响因子
SOLID STATE IONICS
·
2014
·
IF 2.112
Jing Yang,Zhen Huang,Bingxin Huang,Jing Zhou,Xiaoxiong Xu
NASICON-type structure lithium ion conductors have been considered as promising solid electrolytes due to its very high Li + -ion conductivity and chemical stability. In this paper, NASICON-type structured Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 (LAGP) glass–ceramics are prepared from crystallization of glass powders, which are obtained by a simple melt-quench method. NH 4 H 2 PO 4 , H 3 PO 4 , P 2 O 5 and H 3 PO 4 &Al(PO 3 ) 3 are used as phosphorus sources, respectively. The obtained LAGP glass–ceramics are systematically characterized with X-ray diffraction, field emission scanning electron microscopy , differential scanning calorimetry and AC impedance spectroscopy . The different impurities are formed depending on the phosphorus sources, which further influence the microstructure. As a result, the lithium ion conductivity is significantly affected by the phosphorus sources. The highest conductivity of 5.21 × 10 − 4 S·cm − 1 is obtained when H 3 PO 4 is used as the phosphorus source under optimum conditions.
研究领域:
材料科学
·
固态离子学
·
无机非金属材料
·
能源材料
·
电化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xiaowei Wu,Ziqin Liu,Kaiquan He,Junlong Feng,Pu Hu,Fang Zhang,Chaoqun Shang
The lithium metal batteries (LMBs) using metallic Li as anode with high-energy density have been prevailed in the field of energy storage, while the aggregation of Li dendrites and brittle solid state electrolyte interface (SEI) impede the development of Li anode. In this work, to regulate the interface of Li anode, a Fe/Li 2 O/LiCl mixed electron/ion conducting layer is in-situ generated on the surface of Li anode, which is derived from the electrochemical reaction between Li anode and Fe 2 O 3 /FeOCl coatings on commercial separator. The synergistic effect between electron conductive Fe and ion conductive Li 2 O/LiCl is beneficial to build up dense and uniform SEI and promote uniform Li + flux, resulting in smooth Li deposition, which will further stabilize the Li metal surface and prolong the battery life of LMBs. Specifically, the symmetric Li||Li cells with Fe 2 O 3 /FeOCl can operate steadily for 600 h at 1 mAh cm −2 without obvious voltage polarization, and the corresponding full battery matched with S-PAN delivers capacity retention of 64.43 % at 500 mA g −1 after 350 cycles.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
界面工程
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固态电解质界面
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电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 36
·16909-16917
·
IF 3.5
Xie Jingru,Fu Zhifen,Cheng Qing,Chen Chen,She Yubin,Li Xiangyi
Low temperature co-fired ceramics (LTCC) technology is extensively utilized to meet the requirements of device integration and miniaturization. Low-fired Li 3 Mg 2 NbO 6 ceramics doped with x wt% Li 2 O–MgO–B 2 O 3 –CaF 2 –SiO 2 glass (LMBCS, x = 0.5, 1.0, 1.5, 2.0) were prepared by the solid-state reaction method for applications in microwave communication materials. All samples exhibited a single-phase Li 3 Mg 2 NbO 6 structure. The addition of LMBCS glass effectively reduced the sintering temperature of Li 3 Mg 2 NbO 6 ceramics from 1250 °C to 875 °C. And adding LMBCS glass improved the Q × f value of Li 3 Mg 2 NbO 6 ceramics. The Li 3 Mg 2 NbO 6 -1.0wt% LMBCS ceramics exhibited outstanding microwave dielectric properties: ε r = 16.8, Q × f = 89,495 GHz, τ f = − 27.4 ppm/°C at 875 °C, which indicates that this ceramic is potential candidate materials for LTCC.
研究领域:
材料科学
·
电子陶瓷
·
功能材料
·
无机非金属材料
·
微波通信材料
✓ 已验证
DOI
高影响因子
Journal of Sustainable Metallurgy
·
2021
·Vol. 7
·期 1
·203-214
·
IF 2.347
Tang Zujian,Guan Xiaofei
Abstract Lithium is a critical metal with a wide range of applications in energy, electronics, and chemical industry. Currently, the industrial method for Li metal extraction relies on electrolysis of molten LiCl and suffers from various safety, cost, and environmental issues. In this work, we report electrochemical extraction of Li from molten LiOH by using a liquid tin (Sn) cathode. The use of liquid Sn cathode offers various advantages, such as lowering the dissociation potential of LiOH and easy collection of the metallic Li. Electrochemical and materials characterization results reveal that a plunge of electrolysis current occurs in the electrolyser without using a porous alumina membrane, due to the formation of a Li 2 O passivation layer at the cathode/electrolyte interface. In the electrolyser with a porous alumina membrane, continuous electrolysis has been achieved, and the side surface of the liquid Sn is identified to be the effective interface for Li electrodeposition. In addition, we demonstrate the use of the Li–Sn product for the synthesis of acetylene (C 2 H 2 ), a widely used fuel and chemical feedstock. Graphical Abstract
研究领域:
材料科学
·
电化学
·
能源技术
·
化学工程
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Tian Qin,Zihao Wang,Xiaojun Ding,Shuqi Fu,Na Zhan,Wentao Lu,Zijian Li,Zihao Huang,Mingyang Li,Jiansheng Liu,Fei Gao,Weiping Zhou,Zhenzhi Cheng,Guangsheng Luo
Li 7 P 3 S 11 -based all-solid-state lithium metal batteries (ASSLMBs) have received a lot of attention because of their potential for high energy density . However, the poor interfacial stability between Li 7 P 3 S 11 electrolyte and lithium metal anode hinders its application in ASSLMBs. Here, the Li-SnO 2 composite anode (LSO) was designed by treating the lithium metal with SnO 2 to produce an interface composed of Li 22 Sn 5 and Li 2 O phases. The rapid lithium ion diffusion coefficient of Li 22 Sn 5 alloy accelerates the migration of lithium ions at the interface, while the favorable lithiophilicity of Li 2 O induces the uniform deposition of lithium ions, which hinders the growth of lithium dendrites . Therefore, the symmetrical battery using an LSO anode showed a high critical current density (CCD) of 2.5 mA cm −2 at room temperature and a stable cycle of 350 h at room temperature at 0.2 mA cm −2 (0.2 mAh cm −2 ). In addition, the improved all-solid-state lithium battery also showed an ultra-stable cycle, and the NCM622/LPS/10LSO battery still maintained 78.6 % of its original capacity after 250 cycles at 0.5C. The surface treatment method of the LSO composite anode enables it to produce ASSLMB with excellent electrochemical performance .
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2014
·
IF 4.086
Zhenye Zhu,Linwei Zhu
The layered-layered-spinel composite cathode materials Li x Mn 4/6 Ni 1/6 Co 1/6 O (1.75+0.5 x ) with different content of Li 2 O have been synthesized by the two-step co-precipitation method and evaluated in lithium cells. Powder X-ray diffraction provides the evidence that the structures of Li x Mn 4/6 Ni 1/6 Co 1/6 O (1.75+0.5 x ) composite transform from ‘layered-layered’ to ‘layered-layered-spinel’ as the content of Li 2 O decreasing. Electrochemical charge/discharge profiles suggest that Li 1.3 Mn 4/6 Ni 1/6 Co 1/6 O 2.4 electrode with low content of Li 2 O delivers a large initial discharge capacity which is about 305.3 mAh·g −1 , and that the discharge capacities of Li 1.3 Mn 4/6 Ni 1/6 Co 1/6 O 2.4 electrode change little at the first three cycles, because of that a considerable amount of spinel phase in electrode facilitating Li ions diffusion. Nevertheless, the discharge capacities of Li 1.4 Mn 4/6 Ni 1/6 Co 1/6 O 2.45 and Li 1.5 Mn 4/6 Ni 1/6 Co 1/6 O 2.5 electrode in the first three cycles gradually rise as cycles continuing, which is expected to be that Li ions diffusion paths are not fully opened. The irreversible electrochemical reaction that Li 2 O component separates from Li 2 MnO 3 to form MnO 2 happens at the first charge at 4.7 V, and the structure of layered Li 2 MnO 3 component converts into the spinel component during continuously cycles. The Li x Mn 4/6 Ni 1/6 Co 1/6 O (1.75+0.5 x ) composites also display good cycling performance and rate performance. The capacity retention of Li x Mn 4/6 Ni 1/6 Co 1/6 O (1.75+0.5 x ) composites exceeds 100%, and its coulombic efficiency is greater than 98% after 50 cycles. We conclude that electrochemical performances of Li x Mn 4/6 Ni 1/6 Co 1/6 O (1.75+0.5 x ) composites are improved by using the two-step co-precipitation preparation method, especially in terms of large discharge capacity of Li 1.3 Mn 4/6 Ni 1/6 Co 1/6 O 2.4 composite due to the appearance of spinel components.
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Gang Liu,Zixuan Fang,Tingting Feng,Ming Zhang,Mengqiang Wu
Lithium oxides (Li 2 O) possess a considerable theoretical capacity, rendering them highly promising as cathodic pre-lithiation additives. However, its decomposition voltage exceeds the charging cut-off voltage of most cathode materials , hindering its direct use as a cathode sacrificial additive. Herein, we design a facile and safe method to reduce the decomposition energy of Li 2 O at room temperature to offset the irreversible capacity loss by using a core–shell structured Li 2 O-reduced graphene oxide (rGO)-polyethylene glycol (PEG) composite (denoted as Li 2 O-rGO-PEG). The graphene oxide (GO) was heat-treated to remove oxygen functional groups to synthesize rGO, and then reacted with Li 2 O to form a Li 2 O-rGO composite. According to the DFT calculations, the density of states at the Fermi level of Li 2 O-rGO becomes continuous and features a metallic nature, which significantly improves the electrical conductivity of Li 2 O and facilitates electron conduction that modify the delithiation potential of Li 2 O. PEG was used to enhance the cohesive force between rGO and Li 2 O and to protect Li 2 O from atmospheric contamination. Moreover, in order to demonstrate the excellent pre-lithiation ability of Li 2 O-rGO-PEG composite, hard carbon (HC) with low initial coulombic efficiency (ICE) was used as the anode. In the application of LFP (Li 2 O)/HC full cell, Li 2 O was decomposed to Li + to effectively improve the initial charge capacity from 149.7 to 200 mAh/g and discharge capacity from 104.2 to 147.5 mAh/g, which are 33.6 % and 41.6 % higher than those of the pristine LFP/HC full cell, respectively. The cathode pre-lithiation method proposed in this work is simple and environmentally friendly. The successful utilization of Li 2 O as a pre-lithiation additive effectively addressed the issue of low initial coulombic efficiency of the HC, indicating excellent prospects for practical applications.
✓ 已验证
DOI
高影响因子
Nature Catalysis
·
2019
·Vol. 2
·期 11
·1035-1044
·
IF 0
Qiao Yu,Jiang Kezhu,Deng Han,Zhou Haoshen
Li–O 2 batteries have received considerable attention owing to their high theoretical gravimetric energy densities. However, the sluggish kinetic barrier between gaseous O 2 and solid products leads to severe polarized overpotenial. Besides, the gas-open cell architecture and cumbrous O 2 storage accessories bring additional burdens on practical application. Here, by pre-embedding Li 2 O nanoparticles into an iridium–graphene catalytic host, we confine the O 2 -free reversible Li 2 O/Li 2 O 2 interconversion within a sealed cell environment. After rationally controlling the depth of charge, the O 2 /superoxo-free charge capacity can be extended to 400 mAh g –1 (based on the entire cathodic loading mass), with only 0.12 V round-trip overpotential. Ultrastable rechargeability can be achieved for over 2,000 cycles with 99.5% coulombic efficiency. Moreover, matched with a silicon anode, the full-cell output gravimetric energy density can reach nearly 600 Wh kg –1 (based on the loading mass of both electrodes). This work shows that reversible oxide–peroxide conversion can be utilized for the development of high-energy-density sealed battery technologies.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
Nature Communications
·
2024
·Vol. 15
·期 1
·1-9
·
IF 14.7
Zhang Nian,Ren Guoxi,Li Lili,Wang Zhi,Yu Pengfei,Li Xiaobao,Zhou Jing,Zhang Hui,Zhang Linjuan,Liu Zhi,Liu Xiaosong
Garnet-type Li 6.5 La 3 Zr 1.5 Ta 0.5 O 12 (LLZO) is considered a promising solid electrolyte, but the surface degradation in air hinders its application for all-solid-state battery. Recent studies have mainly focused on the final products of the LLZO surface reactions due to lacking of powerful in situ characterization methods. Here, we use ambient pressure X-ray spectroscopies to in situ investigate the dynamical evolution of LLZO surface in different gas environments. The newly developed ambient pressure mapping of resonant Auger spectroscopy clearly distinguishes the lithium containing species, including LiOH, Li 2 O, Li 2 CO 3 and lattice oxygen. The reaction of CO 2 with LLZO to form Li 2 CO 3 is found to be a thermodynamically favored self-limiting reaction. On the contrary, the reaction of H 2 O with LLZO lags behind that of CO 2 , but intensifies at high pressure. More interestingly, the results provide direct spectroscopic evidence for the existence of Li + /H + exchange and reveal the importance of the initial layer formed on clean electrolyte surface in determining their air stability. This work demonstrates that the newly developed in situ technologies pave a new way to investigate the oxygen evolution and surface degradation mechanism in energy materials.
研究领域:
材料科学
·
电化学
·
固态电池
·
表面化学
·
光谱学
✓ 已验证
DOI
高影响因子
Advanced Science
·
2023
·Vol. 10
·期 32
·2304117
·
IF 15.1
Junwu Sang,Kecheng Pan,Bin Tang,Zhang Zhang,Yiyang Liu,Zhen Zhou
Li 6 PS 5 Cl (LPSC) solid electrolytes, based on Argyrodite, have shown potential for developing high energy density and safe all-solid-state lithium metal batteries. However, challenges such as interfacial reactions, uneven Li deposition, and air instability remain unresolved. To address these issues, a simple and effective approach is proposed to design and prepare a solid electrolyte with unique structural features: Li 6 PS 4 Cl 0.75 -OF 0.25 (LPSC-OF 0.25 ) with protective LiF@Li 2 O nanoshells and F and O-rich internal units. The LPSC-OF 0.25 electrolyte exhibits high ionic conductivity and the capability of “killing three birds with one stone” by improving the moist air tolerance, as well as the interface compatibility between the anode or cathode and the solid electrolyte. The improved performance is attributed to the peculiar morphology and the self-generating and self-healing interface coupling capability. When coupled with bare LiCoO 2 , the LPSC-OF 0.25 electrolyte enables stable operation under high cutoff voltage (≈4.65 V vs Li/Li + ), thick cathodes (25 mg cm −2 ), and large current density (800 cycles at 2 mA cm −2 ). This rationally designed solid electrolyte offers promising prospects for solid-state batteries with high energy and power density for future long-range electric vehicles and aircrafts.
研究领域:
材料科学
·
电化学
·
电池技术
·
储能技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）