Chemistry-An Asian Journal
·
2015
·Vol. 11
·期 8
·1194-1198
·
IF 4.587
Yanshan Huang,Yanping Tang,Yiyong Mai,Xinjing Wang,Chi Wang,Sheng Han,Fan Zhang,Dongqing Wu,Xinliang Feng
A three-dimensional polymeric carbon nitride/graphene framework (CN/GF) was fabricated by the ionic self-assembly of graphene oxide and protonated polymeric carbon nitride nanosheets. As the cathode material in lithium-ion batteries, CN/GF showed an excellent reversible capacity of 184 mA h g −1 at 0.05 A g −1 for 150 cycles and maintained the capacity of 60 mA h g −1 at 5 A g −1 .
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2016
·Vol. 99
·期 11
·3784-3791
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IF 2.787
Jingkun Yuan,Peigang He,Chao Yang,Dechang Jia,Jinsong You,Shu Yan,Delong Cai,Zhihua Yang,Xiaoming Duan,Shengjin Wang,Jiahuan Xu,Yu Zhou
The purpose of this work was to study the role of lithium in cesium-based geopolymers and the thermal evolution during heat treatment together with thermal expansion behavior of the resulting geopolymer ceramic. A series of lithium-substituted cesium-based geopolymers, Cs (1− x ) Li x GP (where x = 0, 0.1, 0.2, and 0.3), were prepared. All the geopolymer samples were heated at 1300°C for 2 h and thermal evolution on heating was studied by a variety of techniques. Phase composition, microstructure evolution, and thermal expansion behaviors of the ceramics derived from the geopolymers were characterized. All the geopolymer specimens exhibited similar thermal evolutionary trends. With increases in lithium content, overall mass loss increased gradually due to the higher hydration energy of Li + than Cs + . Thermal shrinkage of these specimens can be divided into four stages, i.e., structural resilience, dehydration, dehydroxylation, and sintering, according to the dilatometer results. The introduction of Li results in two-step sintering behavior for the lithium-substituted cesium-based geopolymers. The average thermal expansion coefficient (CTE) of Cs (1− x ) Li x GP ceramics decreased from 4.80 × 10 −6 K −1 ( x = 0) to 3.61 × 10 −6 K −1 ( x = 0.3) with increase in lithium substitution. The reason can be attributed to the presence of spodumene after thermal treatment, which has a relatively low thermal expansion coefficient compared with pollucite. Meanwhile, molten spodumene could serve as a buffer phase between pollucite crystals also conducive to the decline of CTE of this system.
研究领域:
材料科学
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无机非金属材料
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陶瓷学
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热物理性能
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固废资源化
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2015
·
IF 6.217
Yukun Wang,Lichun Yang,Renzong Hu,Wei Sun,Jiangwen Liu,Liuzhang Ouyang,Bin Yuan,Haihui Wang,Min Zhu
Fe 2 O 3 wrapped by few layered graphene nanosheets composites (Fe 2 O 3 -FLG) have been synthesized via a facile and massive one-step P-milling method, which is effective in reducing the particle size of Fe 2 O 3 and exfoliating the graphite into FLG . The composite shows good electrochemical performance due to the tight wrapping of FLG nanosheets , which is beneficial to electric conductivity and integrity of the electrode. The sample treated under 20 h retains a reversible capacity of 758 mAh g −1 at 200 mA g −1 after 300 cycles, which equals to 88% of its theoretic capacity. With the superior electrochemical performance, Fe 2 O 3 -FLG composites prepared via the P-milling method could be promising as anode materials for high performance lithium-ion batteries.
研究领域:
材料科学
·
电化学
·
纳米复合材料
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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
Zihao Li,Xiaogang Li,Youhao Liao,Xiaoping Li,Weishan Li
We report a novel composite of sulfur loaded in micropore-rich carbon aerogel (CA-S), as cathode of lithium-sulfur battery. Carbon aerogel (CA) is synthesized through phenol-formaldehyde reaction with a low catalyst concentration and carbonization under high temperature, and loaded with sulfur via chemical deposition and heat treatment. The physical properties of the resulting CA and the electrochemical performances of the resulting CA-S are investigated by scanning electron microscopy, thermal gravimetric analysis , Brunauer-Emmett-Teller characterization, electrochemical impedance spectroscopy , and galvanostatic discharge/charge test, with a comparison of a common carbon material, acetylene black (AB), and sulfur loaded in AB (AB-S). It is found that the CA is micropore-rich with micropore volume over 66% of total pore volume , and the CA-S exhibits significantly improved cyclic stability compared with AB-S. The improved performance of CA-S is attributed to the confinement of the micropores in CA to small sulfur allotropes and corresponding lithium sulfides.
研究领域:
电化学
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能源材料
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纳米材料
·
储能技术
✓ 已验证
DOI
高影响因子
Nano Research
·
2018
·Vol. 12
·期 3
·517-523
·
IF 7.994
Liu Tie,Wang Leidanyang,Huang Tao,Yu Aishui
Design and fabrication of framework-structured porous precursors have been regarded as a prospective albeit challenging strategy to obtain bimetal/NC-enriched bifunctional elecrocatalysts. In this work, an effective bottom-up approach involving solution-based self-assembly and a post-annealing process was developed to confine (Co, Zn)-N-C active sites into N-enriched graphitic carbon nanocages. This novel architecture containing N-doped-C stabilized bimetallic nanoparticles derived from ZIF precursors was well-studied by a series of characterization and analysis techniques. Details were given that these well-dispersed (Co, Zn) nanoparticles were encapsulated into the pyridinic-N-dominated graphitic carbon nanocage with a total metal loading of approximately 7.4 at.%. This favorable hierarchical structure not only enhances the electron conductivity, but also owns a sufficient BET surface area facilitating the gas-liquid-solid triphase reaction and producing more space to store discharge products. Importantly, results infer that the interesting nanoframes manifests a satisfying ORR/OER activity and enhanced cell performance whether liquid or solid-state electrolytes are used. As such, our work rationalizes that this type of cage-shaped bimetal-N-C material is promising for high-performance Li-O 2 batteries.
研究领域:
材料科学
·
电化学
·
纳米催化
·
能源存储
·
功能材料
✓ 已验证
DOI
高影响因子
Micro & Nano Letters
·
2018
·Vol. 13
·期 10
·1386-1389
·
IF 0.841
Chenhao Zhao,Jiangshui Luo,Zhibiao Hu
Seeking for the porous carbon with suitable structure and morphology has been a key to improve the lithium storage performance of carbon/selenium composite. In this work, the hierarchical porous N,O Co-doped carbon has been prepared by an initial hydrothermal carbonisation and subsequent activation route using the chitosan as raw material. The carbon obtained at 600°C possessing primary micropores and surface macropores presents high specific surface area (809. 3 m 2 g −1 ) and low porous size, and the selenium with amorphous structure is uniformly encapsulated into the micropores of this carbon to form carbon/selenium composite. As the cathode materials of lithium ion battery, this composite delivers a discharge capacity of 446.9 mAh g −1 at rate of 0.24 C after 100 cycles. At a high rate of 4.8 C, this composite still shows a stable discharge capacity of 342.8 mAh g −1 . These results suggest that this composite may be promising for practical applications for lithium-selenium battery.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
功能碳材料
✓ 已验证
DOI
高影响因子
Small
·
2018
·Vol. 14
·期 11
·1703279
·
IF 9.598
Qian Wang,Minghui Yang,Zhen-Bo Wang,Chao Li,Da-Ming Gu
Shuttle effect of the dissolved intermediates is regarded as the primary cause that leads to fast capacity degradation of Li–S battery. Herein, a microporous carbon-coated sulfur composite with novel rambutan shape (R-S@MPC) is synthesized from microporous carbon-coated rambutan-like zinc sulfide (R-ZnS@MPC), via an in situ oxidation process. The R-ZnS is employed as both template and sulfur precursor. The carbon frame of R-S@MPC composite possesses three kinds of pores that are distinctly separated from each other in space and are endowed with the exclusive functions. The central macropore serves as buffer pool to accommodate the dissolved lithium polysulfides (LPSs) and volumetric variation during cycling. The marginal straight-through mesoporous, connected with the central macropore, takes the responsibility of sulfur storage. The micropores, evenly distributed in the outer carbon shell of the as-synthesized R-S@MPC, enable the blockage of LPSs. These pores are expected to perform their respective single function, and collaborate synergistically to suppress the sulfur loss. Therefore, it delivers an outstanding cycling stability, decay rate of 0.013% cycle −1 after 500 cycles at 1 C, when the sulfur loading is kept at 4 mg cm −2 .
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
功能材料
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Jing Zhang,Caiyin You,Jian Wang,Hong Xu,Chuanzhi Zhu,Shaohua Guo,Weihua Zhang,Rong Yang,Yunhua Xu
For the practical application of lithium-sulfur batteries, the high areal capacity based on high loading sulfur cathode is urgently pursued. Herein, the electrochemical rate and cycling performance are significantly enhanced by the design of polar hierarchical-porous carbon container to confine sulfur species. The as-fabricated carbon container shows the following merits: providing an affordable pore volume of 4.94 cm 3 g −1 for confining sulfur and releasing volume changes; facilitating rapid electron/ion transfer pathway; allowing efficient chemisorption of polysulfides by polar active sites synergistically. As a result, the cathode displays a high rate capacity of 581 mA h g −1 at 8 C and a stable cyclability at 2 C. Importantly, the cathode with 7.2 mg cm −2 sulfur loading presents a high areal capacity of 9.75 mA h cm −2 at 0.05 C and high rate performance. Up to 7.5 mg cm −2 , the high loading cathode could still display a high areal capacity of 5 mA h cm −2 at 1 C after 80 cycles. Moreover, the container can successfully work in a pouch cell with low E/S ratio. These results show a promising way to promote the practical utilization of Li-S batteries.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
功能碳材料
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 9
·6201-6213
·
IF 2.779
Liu Huigen,Hu Guobin,Luo Yuan,Zhang Kaiyou,Chen Shuoping,Qin Aimiao
In this work, we propose a method to prepare anode materials for LIBs from alumina industrial waste red mud. The dispersed red mud with a sand-like morphology was obtained by an aicd pretreatment combined a SDS assist hydrothermal method. The as-prepared dispersed red mud electrode delivered a high discharge/charge capacity (1668.1 mAh g −1 at 0.1 A g −1 after 200 cycles) and an excellent long-cycle performance (460 mAh g −1 at 2.0 A g −1 after 360 cycles). The outstanding electrochemical performance of the dispersed red mud electrode can be attributed to the addition of SDS, which inhibits the agglomeration of iron oxide, reduces the volume change caused by the lithium intercalation/deintercalation process, and reduces the irreversible capacity. The SiO 2 and Al 2 O 3 scattered in the red mud also play a synergistic effect, alleviating the volume expansion during charging and discharging, and improving the cycle stability of the dispersed red mud. The application of red mud in anode materials for LIBs may provide an idea for the recycling of waste resources, reducing energy shortages and easing environmental pollution.
研究领域:
材料科学
·
电化学
·
能源材料
·
环境工程
·
工业废弃物利用
·
纳米材料
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Zhiwen Wang,Dong Cao,Mingxi Ren,Hanning Zhang,Limei Pan,Chuanfang John Zhang,Jian Yang
Silicon-based materials are considered the most promising anode materials for lithium-ion batteries (LIBs). However, due to the huge volume effect of Si powder during charging and discharging, the pulverization and peeling of silicon nanoparticles results in a certain amount of active material loss, which significantly affects the stability and coulombic efficiency of the battery . In this paper, a simple suspension mixing-freeze drying process was used to prepare a Si@Ti 3 C 2 T x composite with a fluffy and porous structure , in which Si nanoparticles (SiNPs) are wrapped in a 3D conductive network of wrinkled and curled Ti 3 C 2 T x nanosheets . Thus, both Si nanoparticle agglomeration and restacking of Ti 3 C 2 T x nanosheets are inhibited, electrolyte penetration and charge transfer are facilitated, and Si nanoparticle volume expansion is effectively buffered. When used as an LIB anode, after 500 cycles and at a density of 1 A g −1 , a high specific capacity of 1729 mAh g −1 and coulombic efficiency of ≥ 98.5% were achieved for Si@Ti 3 C 2 T x , showing excellent electrochemical performance .
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 ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Meili Qi,Ming Hu,Jianwei Xu,Xinhua Yuan,Zhiping Zhang
With high capacity and its safety, titanium niobium oxide (Ti 2 Nb 10 O 29 , TNO) has been reported as a potential anode for high power lithium ion batteries . However, insufficient diffusion coefficient of Lithium-ions and poor electronic conductivity for this electrode material significantly constrains its rate capability. To solve this issue, we propose a simple strategy to encapsulate Ti 2 Nb 10 O 29 in porous carbon nanofiber arrays (porous TNO/CNF) and to prepare heterogeneous Ti 2 Nb 10 O 29 /carbon nanofiber core-shell composite arrays (TNO NPs-CNF) using polyamic acid (PAA) as the polymer precursor. TNO NPs-CNF electrode exhibits significantly superior electrochemical performance (286 mA h g −1 at 10 C and 225 mA h g −1 at 20 C), much better than the TNO and porous TNO/CNF. For the electrode of porous TNO/CNF and TNO NPs-CNF, the omni-directional conducting networks of CNF skeleton greatly enhances electron transport of the whole electrode, reduces energy barrier of lithium ion transport, and maintains the structure’s stability.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
功能材料
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Zhengqing Pei,Jiawei Wang,Haifeng Wang,Kexin Zheng,Qian Wang,Jiexin Zhou,Dehua Ma,Ju Lu,Fanghai Lu
The study investigated the evolution of LNMO (LiNi0.5Mn1.5O4) morphology and surface orientation as a function of increasing temperature. The results show that at an initial calcination temperature of 750 °C, LNMO exhibits spherical polyhedral with (111), (110), and (100) facets and relatively small particle sizes. In response to increasing temperatures, the particle size increases, the number of crystal facets decreases, and the material ultimately transitions to a typical spinel structure. Notably, the LNMO material calcined at 750 °C demonstrates a high lithium-ion migration rate, retaining 81.24% of its capacity after 500 cycles at a 2 C rate. This exceptional performance is attributed to the exposure of multiple crystal facets, suitable particle size, and the presence of Mn³⁺, which collectively stabilize the crystal structure and provide suitable pathways for Li⁺ transport.
研究领域:
材料科学
·
电化学
·
无机化学
·
能源材料
·
固态化学
·
电池技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）