NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 11
·9074-9079
·
IF 3.201
Zhixiong Hu,Jiali Sheng,Jiahui Chen,Guoqing Sheng,Yunming Li,Xian-Zhu Fu,Lei Wang,Rong Sun,Ching-Ping Wong
Ge-Doped Li0.33La0.56TiO3 (Ge-LLTO) perovskites are synthesized with various GeO2 contents by solid-state reactions as Li-ion conductive electrolytes for rechargeable all-solid-state Li batteries. After the addition of GeO2, the sinterability and Li ion conductivity are enhanced for the perovskite solid electrolyte. The Li0.43La0.56Ti0.95Ge0.05O3 electrolytes exhibit the highest sinterability and Li ion conductivity among the as-prepared Li0.33+2xLa0.56Ti1−xGexO3 electrolytes. The improvement of Li ion conductivity might be attributed to the improvement of the densification and structural integrity of the LLTO solid electrolyte. The lithium transference number (tLi+) of Ge-doped LLTO is close to 1. Moreover, the Ge-LLTO electrolytes are stable in the potential range of 0–10 V vs. Li/Li+.
研究领域:
材料科学
·
电化学
·
储能技术
·
固体离子学
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Dacheng Zhang,Linlin Wang,Qian Wu,Yujie Yang,Jingli Xu
In this work, a novel N/O Co-doped hollow carbon nanocapsule-supported Ge nanoparticles nanocomposite (Ge-N/O-CNCs) was successfully prepared by a facile heating reflux method. N/O codoped hollow carbon nanocapsule-supported Ge nanoparticles not only relieve the agglomeration of Ge nanoparticles and control the volume expansion, but also facilitate the rapid transmission of electrons. In LIBs, the unique Ge-N/O-CNCs nanoarchitecture was used as the anode material. At a high current density of 1 A g -1 , it remains a stable specific capacity of 448 mAh g -1 remained after 100 cycles. Additionally, even at 3.2 A g -1 , this material exhibited a high-rate specific capacity of 350 mAh g -1 .
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2016
·
IF 6.333
Bangrun Wang,Zhaoyin Wen,Jun Jin,Xiaoheng Hong,Sanpei Zhang,Kun Rui
Germanium is considered as a promising anode material for lithium ion batteries (LIBs) due to its high-capacity. However, owing to the huge volume variation during cycling, the batteries based on germanium anodes usually show poor cyclability and inferior rate capability. Herein, we demonstrated a novel strategy to uniformly anchor the core-shell structured germanium@carbon (Ge@C) on the reduced graphene oxide (rGO) nanosheets by the strong adhesion of dopamine. In the resulting Ge@C/rGO hybrid, the amorphous carbon layer and rGO nanosheets can effectively reduce the agglomeration of germanium and provide buffer matrix for the volume change in electrochemical lithium reactions. When used as anode materials for LIBs, Ge@C/rGO hybrids deliver a reversible capacity of 1074.4 mA h g −1 at 2C after 600 cycles (with capacity retention of 96.5%) and high rate capability of 436 mA h g −1 at 20C after 200 cycles. The encouraging electrochemical performance clearly demonstrates that Ge@C/rGO hybrids could be a potential anode material with high capacity, excellent rate capability, and good cycling stability for LIBs.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2022
·
IF 13.599
Yao Chen,Yuming Zou,Xiaoping Shen,Jingxia Qiu,Jiabiao Lian,Jinrui Pu,Sheng Li,Fei-Hu Du,Shang-Qi Li,Zhenyuan Ji,Aihua Yuan
Germanium (Ge), an alloy-type anode material for lithium-ion batteries (LIBs), possesses many advantages such as high theoretical capacity and decent electrical conductivity. Nevertheless, its application is restricted by tremendous volume variation and tardy reaction kinetic during discharge/charge process. In this paper, the Ge/3DPG composites with Ge nanoparticles uniformly dispersed in 3D interconnected porous graphene (3DPG) skeleton are successfully prepared using a template-assisted in-situ reduction method. The unique 3D interconnected porous graphene can not only enhance the electronic conductivity and reaction kinetics of the materials, but also provide sufficient buffer space to effectively mitigate the volume expansion during cycling and strengthen the structural integrity. Moreover, the small-sized Ge nanoparticles in close conjunction with the 3D graphene can boost the surface-controlled reaction of the electrode, which contributes to a fast charge–discharge rate capability. The Ge/3DPG composite with optimized Ge/graphene mass ratio delivers high reversible specific capacity (1102 mAh g −1 after 100 cycles at 0.2 C), outstanding rate capability (494 mAh g −1 at 5 C), and admirable cycling stability (85.3% of capacity retention after 250 cycles at 0.5 C). This work provides a significant inspiration for the design and fabrication of advanced Ge-based anode materials for next-generation high-performance LIBs.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2019
·Vol. 26
·期 5
·2225-2231
·
IF 2.289
Liu Lili,Wang Xiaoyang,Zhang Xiaohong,Zhang Xiuyun,Chen Shimou
Germanium-based materials as anode can improve the capacity of lithium-ion battery because of its excellent lithium-ion storage ability. But the application of Ge anode is hampered by the huge volume variation during de/lithiation processes. Herein, a Ge/Cu wire mesh (Ge/Cu-WM) electrode is prepared by ionic liquid electrodeposition, where the Ge nano-film is deposited on Cu wire mesh. The unique structure of Ge/Cu-WM electrode not only buffers the volume expansion but also enhances electron migration and electron transport during lithiation. The Cu 3 Ge is observed by XRD, which confirms that the Ge nano-film tightly attach to the Cu wires. All structural properties give the electrode excellent electrochemical performance, where a capacity of 633 mAh/g after 100 cycles at 0.1 C is obtained. The reasonable structure and improved cycling stability make Ge-based anodes highly attractive for lithium-ion battery applications.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
Chemistry-An Asian Journal
·
2026
·Vol. 21
·期 6
·e70700
·
IF 3.2
Mingxia Zhang,Ting Wang,Yurong Wang,Yongjian Cui,Huaping Wang,Junze Liu,Hailong Wang
Silicon (Si) anodes are promising candidates for surpassing the energy density limits of current lithium‑ion batteries, owing to the ultra‑high theoretical capacity (4200 mAh g −1 ). However, their practical implementation is hindered by irreversible lithium (Li) loss, which originates from the continuous formation of the solid electrolyte interphase (SEI) and the irreversible trapping of Li + within the silicon matrix due to sluggish Li + diffusion kinetics. To address these issues, a Si/Ge@C heterojunction anode has been designed. In this configuration, a conformal carbon coating effectively mitigates volume expansion and suppresses parasitic reactions on the Si surface, thereby reducing excessive SEI formation. Moreover, the Si/Ge heterojunction establishes a built‑in electric field oriented from Si to Ge, which reduces Li + trapping. This built‑in electric field not only facilitates Li + migration toward Ge during lithiation but also provides an additional driving force to extract trapped Li + from Si during delithiation. Consequently, the optimized Si/Ge@C anode delivers a high initial Coulombic efficiency (ICE) of 92.47% and maintains a high capacity of 539.77 mAh g −1 over 500 cycles at 200 mA g −1 .
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Bangrun Wang,Jun Jin,Zhaoyin Wen
Core-shell structured germanium@nitrogen-doped carbon (Ge@NC) hybrids with well-encapsulated Ge particles within a conductive coating is an ideal anode material for high energy and power density lithium-ion batteries (LIBs). Here, we propose a novel route to synthesize core-shell structured Ge@NC hybrids by the modified in situ spray pyrolysis technique using a mixed spray solution consisting of a Ge precursor as an active material source and polyvinylpyrrolidone (PVP) as a carbon source. It is found that in situ formed submicron Ge (200–800 nm) crystals encapsulated in a N-doped carbon coating, allows the increase of electrical conductivity for Ge with enhanced structural stability. For lithium storage, the Ge@NC hybrids exhibit superior properties compared to that of pure Ge such as excellent long-term cycling stability (917 mAh g −1 with a capacity decay of 0.018% per cycle for 1000 cycles at 1 C) and outstanding rate capability (806 mAh g −1 at 5 C after 400 cycles). The full cell assembled with Ge@NC anode and LiNi 0.5 Co 0.2 Mn 0.3 O 2 cathode presents high energy density. Moreover, the spray pyrolysis method allows a yield of ∼4.8 g h −1 with a lab-scale equipment, demonstrating that established industrial processes can be applied to produce Ge-based anodes with sophisticated structures.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2022
·Vol. 34
·期 27
·2202858
·
IF 32.086
Jinlin Wang,Jiazheng Zhou,Xiao Xu,Fanqi Meng,Chunxu Xiang,Licheng Lou,Kang Yin,Biwen Duan,Huijue Wu,Jiangjian Shi,Yanhong Luo,Dongmei Li,Hao Xin,Qingbo Meng
Aiming at a large open-circuit voltage ( V OC ) deficit in Cu 2 ZnSn(S,Se) 4 (CZTSSe) solar cells, a new and effective strategy to simultaneously regulate the back interface and restrain bulk defects of CZTSSe absorbers is developed by directly introducing a thin GeO 2 layer on Mo substrates. Power conversion efficiency (power-to-efficiency) as high as 13.14% with a V OC of 547 mV is achieved for the champion device, which presents a certified efficiency of 12.8% (aperture area: 0.25667 cm 2 ). Further investigation reveals that Ge bidirectional diffusion simultaneously occurs toward the CZTSSe absorber and MoSe 2 layer at the back interface while being selenized. That is, some Ge element from the GeO 2 diffuses into the CZTSSe absorber layer to afford Ge-doped absorbers, which can significantly reduce the defect density and band tailing, and facilitate quasi-Fermi level split by relatively higher hole concentration. Meanwhile, a small amount of Ge element also participates in the formation of MoSe 2 at the back interface, thus enhancing the work function of MoSe 2 and effectively separating photoinduced carriers. This work highlights the synergistic effect of Ge element toward the bulk absorber and the back interface and also provides an easy-handling way to achieve high-performance CZTSSe solar cells.
研究领域:
材料科学
·
光伏技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Zhiliang Li,Zheng Su,Hongxia Zhang,Qing Wang,Jianglong Wang,Xin Qian,Qian Cao,Zhihai Ding,Jing-Feng Li,Shufang Wang
Higher manganese silicide (HMS) is a naturally abundant, environmentally friendly, and mechanically robust P-type thermoelectric (TE) semiconductor. Isoelectronic doping elements Re and Ge are used to partially occupy cation (Mn) and anion (Si) sites, respectively. Compared with the single Re-doped strategy, TE performance is further improved in the isoelectronic double-doped Mn 0.96 Re 0.04 (Si 0.96 Ge 0.04 ) 1.79 composition. The electrical conductivity (∼54.2 × 10 3 S m –1 at 823 K) is double that of pure HMS (∼26.1 × 10 3 S m –1 ), whereas the power factor increases from ∼1.42 × 10 –3 W m –1 K –2 to ∼1.80 × 10 –3 W m –1 K –2 due to the increase in carrier concentration caused by the decreased band gap (from 0.82 eV to 0.74 eV), as well as the embedding of the Si, Ge nanodispersions with low work functions. Furthermore, the substitution of Re and Ge increases the amounts of lattice defects, and the presence of nanoscale Ge precipitates cause the broadband phonon-scattering effect in the HMS matrix. Finally, the lattice thermal conductivity at 673 K decreases from ∼2.18 W m –1 K –1 to ∼1.60 W m –1 K –1 . The zT value at 823 K increases by ∼36% from 0.45 to 0.61. The strategy of cation and anion double doping can effectively improve the TE properties of materials, which has significance for the optimization of other materials.
研究领域:
材料科学
·
热电学
·
半导体物理
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Cheng Huang,Kun Li,Hong Zhang,Wenwen Zhang,Yanlin Sun,Shujie Xing,Ying Shao,Jing Zhu,Yalan Chen,Long Chen
In this study, a solid adsorbent based on Chinese gallotannin and chitosan was generated and applied to adsorb rare and scattered metals, including Ge (Ⅳ), Ga (Ⅲ), and In (Ⅲ), from simulated zinc plant leachates. Fourier-transform infrared spectroscopy (FTIR) and solid state nuclear magnetic resonance (SSNMR) were performed to characterize the grafting way of Chinese gallotannin on the chitosan matrix. It was clearly showed that Chinese gallotannin was immobilized on the chitosan by Schiff-base condensation and phenol-formaldehyde reaction at the molar ratio of glutaraldehyde to tannin of 2:1. And the amount of chitosan amino groups was ten times that of tannin, with an initial pH of 4. The adsorption experiments showed that an appropriate increase in pH was more beneficial to enhance the adsorption capacity of immobilized Chinese gallotannin (ICGT). At a temperature exceeding 30 °C, the immobilized tannin became less sensitive to temperature. Adsorption kinetics studies showed that the adsorption of the three scattered metals by ICGT followed a quasi-second-order kinetic equation , with chemisorption as the mechanism. The adsorption isotherm was well fitted by the Langmuir model, indicating uniform adsorption sites on the surface of ICGT. The adsorption capacities of Ge (Ⅳ), Ga (Ⅲ), and In (Ⅲ) in solution by the adsorption model of monolayer were 61.39 mg/g, 63.82 mg/g, and 59.92 mg/g, respectively. Mechanical property and stability tests showed that ICGT had good resistance to harsh adsorption conditions of scattered metal ions .
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Nature Energy
·
2024
·
IF 49.7
Cui Longfei,Zhang Shu,Ju Jiangwei,Liu Tao,Zheng Yue,Xu Jiahao,Wang Yantao,Li Jiedong,Zhao Jingwen,Ma Jun,Wang Jinzhi,Xu Gaojie,Chan Ting-Shan,Huang Yu-Cheng,Haw Shu-Chih,Chen Jin-Ming,Hu Zhiwei,Cui Guanglei
All-solid-state lithium batteries typically employ heterogeneous composite cathodes where conductive additives are introduced to improve mixed conduction. These electrochemically inactive additives are not fully compatible with layered oxide cathodes that undergo large volume change, significantly reducing battery energy density and cycle life. Here we propose a cathode homogenization strategy by cold pressing a zero-strain cathode material with efficient mixed conduction throughout the (dis)charge process. Li 1.75 Ti 2 (Ge 0.25 P 0.75 S 3.8 Se 0.2 ) 3 possesses considerable Li + /electronic conductivity of 0.22/242 mS cm − 1 when fully charged, increasing monotonically to 0.66/412 mS cm − 1 when fully discharged. It delivers a specific capacity of 250 mAh g −1 and undergoes a 1.2% volume change. Homogeneous cathodes composed of 100% Li 1.75 Ti 2 (Ge 0.25 P 0.75 S 3.8 Se 0.2 ) 3 enable room-temperature all-solid-state lithium batteries to achieve a cycle life of over 20,000 cycles at 2.5 C with a specific capacity retention of 70% and a high energy density of 390 Wh kg − 1 at the cell level at 0.1 C. This cathode homogenization strategy contrasts to the conventional cathode heterogeneous design, potentially improving the viability of all-solid-state lithium batteries for commercial applications.
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 ANALYTICAL AND APPLIED PYROLYSIS
·
2025
·
IF 6.2
Juan Cai,Boyan Zhang,Jiatao Dang,Yunpeng Zhao,Dingcheng Liang,Qiang Xie,Jinchang Liu
The migration, transformation, and enrichment of strategic metal elements in coal in the process of coal processing and utilization are significant for their effective extraction and application. In this work, the migration, transformation, and enrichment of Li, Ga, Ge, In, and Re during coal pyrolysis were investigated by six-step sequential chemical extraction. The results showed that Li mainly exists in a residual state in raw coal and pyrolytic products under 500 ℃; however, the content of sulfide state Li increases largely when the pyrolysis temperature exceeds 500 ℃. Ga mainly enriches in residual form, and the content of Ga in the residual state rises with the pyrolysis temperature increasing. Ge mainly presents in the form of carbonate-binding state, sulfide state, and residual state. As the temperature rises to higher than 500 ℃, Ge combines with the carbon and oxygen compounds produced by pyrolysis to form a carbonate-binding state, resulting in a significant increase in its content. The content of Ge in the residual state also increases significantly. The ratio of carbonate-binding state and organic state In gradually decreases with the increase of pyrolysis temperature, while that of residual state In gradually increases. Due to the low content of Re, the reliability of the test results is poor. However, Re may exist in sulfide, organic, and residual states. With the pyrolysis temperature increasing, Li, Ga, Ge, In, and Re in pyrolysis products are more likely to combine with aluminosilicate than those in raw coal.
研究领域:
能源科学
·
环境科学
·
材料科学
✓ 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）