CHINESE JOURNAL OF CHEMICAL PHYSICS
·
2023
·Vol. 36
·期 2
·231-231
·
IF 1
Liu Xu-hao,Liu Yang-yang,Zhu Rong-zhi,Liu Lu-jie,Xu Chen-xin,Cao Hui
Metal-halide perovskite solar cells (PSCs) have attracted considerable attention during the past decade. However, due to the existence of non-radiative recombination losses, the best power conversion efficiency (PCE) is still lower than the theoretical limit defined by Shockley-Queser theory. In this work, we investigate 1,2,3-oxathiazin-4(3h)-one, 6-methyl-2,2-dioxide (acesulfame potassium, abbreviated as AK) as a additional dopant for the 2,2′,7,7′-tetrakis( N , N -di-p-methoxyphenyl-amine)-9,9′-spirobifluorene (Spiro-OMeTAD) and fabricate PSCs in the air. It is found that 12 mol% fraction of AK relative to lithium bis((trifluoromethyl)sulfonyl)-amide (Li-TFSI) reduces the non-radiative recombination from 86.05% to 69.23%, resulting in an average 0.08 V of V oc enhancement. The champion solar cell gives a perovskite solar cells up to 21.9% and over 84% retention of the initial value during 720 h aging in dry air with 20%–30% humidity.
研究领域:
材料科学
·
可再生能源
·
光伏技术
✓ 已验证
DOI
高影响因子
Materials
·
2020
·Vol. 13
·期 23
·5528
·
IF 3.057
Bolong Hong,Xiangming He,Huihua Yi,Chenglin Hu
LiMnBO3is a potential cathode for Li-ion batteries, but it suffers from a low electrochemical activity. To improve the electrochemical performance of LiMnBO3, the effect of polyvinyl pyrrolidone (PVP) as carbon additive was studied. Monoclinic LiMnBO3/C and LiMnBO3-MnO/C materials were obtained by a solid-state method at 500 °C. The structure, morphology and electrochemical behavior of these materials are characterized and compared. The results show that carbon additives and ball-milling dispersants affect the formation of impurities in the final products, but MnO is beneficial for the performance of LiMnBO3. The sample of LiMnBO3-MnO/C delivered a high capacity of 162.1 mAh g−1because the synergistic effect of the MnO/C composite and the suppression of the PVP coating on particle growth facilitates charge transfer and lithium–ion diffusion.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Materials
·
2021
·Vol. 14
·期 13
·3624
·
IF 3.623
Zhijie Xu,Fangxu Hu,De Li,Yong Chen
In the late 1960s, the establishment of Prigogine’s dissipative structure theory laid the foundation for the (electro)chemical oscillation phenomenon, which has been widely investigated in some electrochemical reactions, such as electro-catalysis and electro-deposition, while the electrochemical oscillation of Li-ion batteries has just been discovered in spinel Li4Ti5O12a few years before. In this work, spinel LiCrTiO4samples were synthesized by using a high-temperature solid-state method, characterized with SEM (Scanning electron microscope), XRD (X-ray diffraction), Raman and XPS (X-ray photoelectron spectroscopy) measurements, and electrochemically tested in Li-ion batteries to study the electrochemical oscillation. When sintering in a powder form at a temperature between 800 and 900 °C, we achieved the electrochemical oscillation of spinel LiCrTiO4during charging, and it is suppressed in the non-stoichiometric LiCrTiO4samples, especially for reducing the Li content or increasing the Cr content. Therefore, this work developed another two-phase material as the powder-sintered LiCrTiO4exhibiting the electrochemical oscillation in Li-ion batteries, which would inspire us to explore more two-phase electrode materials in Li-ion batteries, Na-ion batteries, etc.Keywords:Li-ion battery;LiCrTiO4;electrochemical oscillation;phase transition;spinel structure
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2022
·Vol. 105
·期 10
·6407-6416
·
IF 4.186
Hao Guo,Yanli Shi,Hailiang Wang,Ruichong Chen,Diyin Ye,Qiwu Shi,Jianqi Qi,Zhijun Liao,Tiecheng Lu
Li 2 TiO 3 has a broad stoichiometric range and wide application prospects such as cathode, tritium breeder, and microwave dielectric materials. Particularly, Li 2 TiO 3 shows a faster tritium release performance and exceptional chemical and radiation stabilities, making it one of the most promising solid breeder materials. Li-rich Li 2 TiO 3 has been developed for years as an advanced breeder material due to its enhanced tritium production and better stability in hydrogen atmosphere. However, the defect chemistry responsible for accommodating excess Li and how the non-stoichiometry improves the material's performance is still unclear. In this work, the crystal structure and non-stoichiometry-induced defects in Li-rich Li 2 TiO 3 were investigated by means of X-ray diffraction, electron spin resonance, and X-ray photoelectron spectroscopy. Results show that oxygen vacancies and cation disorder both play a major role in the incorporation of excess Li. The sintering atmosphere (air/vacuum) has a negligible effect on the formation of the non-stoichiometry-induced defects but will influence the concentration of the oxygen vacancies. The better stability in the reduction atmosphere may be ascribed to the oxygen vacancies inside the Li-rich Li 2 TiO 3 crystals.
研究领域:
材料科学
·
核能工程
·
固体化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Jianfeng Jia,Chuhao Tan,Mengchuang Liu,De Li,Yong Chen
In Li-ion batteries, memory effect has been found in several commercial two-phase materials as a voltage bump and a step in the (dis)charging plateau, which delays the two-phase transition and influences the estimation of the state of charge. Although memory effect has been first discovered in olivine LiFePO4, the origination and dependence are still not clear and are critical for regulating the memory effect of LiFePO4. Herein, LiFePO4 has been synthesized by a home-built spray drying instrument, of which the memory effect has been investigated in Li-ion batteries. For as-synthesized LiFePO4, the memory effect is significantly dependent on the relaxation time after phase transition. Besides, the voltage bump of memory effect is actually a delayed voltage overshooting that is overlaid at the edge of stepped (dis)charging plateau. Furthermore, we studied the kinetics of LiFePO4 electrode with electrochemical impedance spectroscopy (EIS), which shows that the memory effect is related to the electrochemical kinetics. Thereby, the underlying mechanism has been revealed in memory effect, which would guide us to optimize two-phase electrode materials and improve Li-ion battery management systems.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 9
·6626-6630
·
IF 3.201
Ye Yuan,Bo Wang,Rensheng Song,Fei Wang,Hao Luo,Tiantian Gao,Dianlong Wang
A LiFePO4 (LFP)/lithium polysulfide (Li2Sn) hybrid system was designed using a LFP cathode and a Li2Sn-added electrolyte to improve the Li-ion storage performance. In the LFP cathode, a commercial LFP product was introduced as the active material. And the Li2Sn-added electrolyte was prepared through a facile liquid-phase process. Benefiting from the synergistic effect for energy-storage between the LFP component and the Li2Sn component, the designed LFP/Li2Sn hybrid system exhibited a large specific capacity (439 mA h g−1 at 0.2C), good rate performance (323 mA h g−1 at 2C) and stable cycling property (82% capacity retention over 200 cycles). It is believed that the designed LFP/Li2Sn hybrid system and the proposed hybrid energy-storage concept could advance the development of electrochemical energy storage.
研究领域:
电化学
·
材料科学
·
能源存储
·
电池技术
·
纳米材料
·
固态离子学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Xin Dong,Ziqin Liu,Kaiquan He,Pu Hu,Chaoqun Shang
Li metal is a potential anode material for the next generation high-energy–density batteries because of its high theoretical specific capacity. However, the inhomogeneous lithium dendrite growth restrains corresponding electrochemical performance and brings safety concerns. In this contribution, the Li 3 Bi/Li 2 O/LiI fillers are generated by the in-situ reaction between Li and BiOI nanoflakes, which promises corresponding Li anodes (BiOI@Li) showing favorable electrochemical performance. This can be attributed to the bulk/liquid dual modulations: (1) The three-dimensional Bi-based framework in the bulk-phase lowers the local current density and accommodates the volume variation; (2) The LiI dispersed within Li metal is slowly released and dissolved into the electrolyte with the consumption of Li, which will form I − /I 3 − electron pair and further reactivate the inactive Li species. Specifically, the BiOI@Li//BiOI@Li symmetrical cell shows small overpotential and enhanced cycle stability over 600 h at 1 mA cm −2 . Matched with an S-based cathode, the full Li-S battery demonstrates desirable rate performance and cycling stability.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
固态离子学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2021
·
IF 9.127
Weize Jin,Tao Zhou,Zhaolei Wang,Wenwen Xue,Chun Feng,Fang Zhang,Xiaoyu Huang,Dong Yang,Patrick Théato,Yongjun Li
Covalently grafting redox-active polymer to graphene sheets is a practical approach for developing high-performance organic cathode materials . Here, we report a facile preparation of radical polymer poly(2,2,6,6-tetramethylpiperidin-1-oxyl-4-yl methacrylate) (PTMA) grafted graphene sheets (rGO) composites (rGO- g -PTMA) with various PTMA contents via one-step radical polymerization , and their applications as cathodes for Li-ion/Na-ion batteries. The energy storage capacity of rGO- g -PTMA is determined by the relative contribution from the battery-type redox reaction of PTMA and the pseudocapacitive behavior of rGO sheets. The optimized rGO- g -PTMA 50 composite with 50 wt% of PTMA shows excellent energy storage performance, which is almost two times higher than that of the physically blended rGO/PTMA 50 owing to reduced solubility of PTMA in electrolyte solution and improved electrical conductivity . As cathode materials for Li-ion/Na-ion batteries, rGO- g -PTMA 50 shows superior performance including high capacity, good cycling and rate stability. Hence, this covalently bonded radical polymers on graphene provide new option for developing high-performance organic cathode materials for Li-ion/Na-ion batteries.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
高分子化学
·
电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2017
·
IF 6.395
Yonghuan Ren,Ziqun Yu,Guangji Song
Battery thermal management (BTM) system plays a key part in vehicle thermal safety. A novel method employing water evaporation is presented in this paper. The thin sodium alginate film (SA-1 film) with water content of 99 wt% is prepared using a simple spraying method, and is attached on the surface of battery pack to explore its effectiveness on preventing heat accumulation. The result shows that under the condition with constant current charge/discharge larger than 1 C, the temperature rise rate is reduced by half. Under the condition with the New Europe Drive Cycle, the temperature could maintain stable without obvious rise. Moreover, a simple water automatic-refilling system is designed to address the dry issue of the film in terms of evaporation elimination. The proposed SA-1 film BTM system shows to be a very convenient and efficient approach in handling the thermal surge of Li-ion batteries without any change in battery pack integration and assembly.
✓ 已验证
DOI
高影响因子
Journal of Energy Chemistry
·
2020
·
IF 7.216
Ting Chen,Dewu Zeng,Long Zhang,Meng Yang,Dawei Song,Xinlin Yan,Chuang Yu
As a type of candidate for all-solid-state Li batteries, argyrodite solid electrolytes possess high ionic conductivity , but poor compatibility against Li metal. Here, we report novel Li 6 PS 5 I-based argyrodite sulfides with Sn-O dual doping , which is a powerful solution to comprehensively improve the performance of a material. The combination of O and Sn-aliovalent doping not only enables an improved ionic conductivity but more importantly realizes an intensively enhanced interfacial compatibility between argyrodite and Li metal and Li dendrite suppression capability. The assembled battery with Sn-O dual-doped electrolyte and Li anode demonstrates high capacity and decent cycling stability. Dual doping is thus believed to be an effective way to develop high performance sulfide solid electrolytes.
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Kaixin Yu,Ji Qian,Fujie Wang,Xingming Guo,Li Li,Feng Wu,Renjie Chen
Lithium metal batteries (LMBs) are considered one of the most attractive high-specific energy storage devices. However, their popularization and application are plagued by the uncontrollable lithium deposition and unlimited volume expansion of lithium metal anodes during the repeated depositing/stripping. Here, we load a metal–organic framework (ZIF-67) on a three-dimensional (3D) flexible melamine sponge (MS) through a liquid phase reaction to prepare a MS with ZIF-67 nanoparticles (MSZ). The unique MSZ interlayer can offer accommodation space for “hostless” lithium; the specific pore structure and polar chemical structure of the MS/ZIF-67 work together to guide uniform lithium deposition. The Li–Cu cells with the MSZ interlayer exhibit remarkable electrochemical performance with a small voltage hysteresis less than 105 mV beyond 250 cycles (5 mA cm–2), and the high Coulombic efficiency remains over 98% after 700 cycles at 1 mA cm–2. Even at an extremely high current density of 10 mA cm–2, this enhancement is achieved. The introduction of the MSZ interlayer into Li/LiFePO4 cells enhances their cycling performance with a reversible specific capacity of 99.7 mAh g–1 over 1000 cycles at 1C. Our work provides new ideas for stable high-specific energy lithium metal batteries.
研究领域:
储能
·
材料科学
·
电化学
·
锂电池
✓ 已验证
DOI
高影响因子
JOURNAL OF THE CHINESE INSTITUTE OF ENGINEERS
·
2022
·
IF 1.107
Zheng Jin,Suihan Cui,Cuiqing Jiang,Tijun Li,Chao Yang,Zhongzhen Wu
Reaction polarization of the Li(NixMnyCoz)O2 (NMC) cathode materials can be significantly alleviated by depolarization and pre-lithiation, which respectively produce electrolyte protective layer and double-layer lithium structure. These structures can not only prevent Ni ions from dissolution but also increase the discharge capacity. However, as the size of the regular NMC particles is relatively large, the effect of depolarization and pre-lithiation is not significant. This work tries to prepare NMC with nanoscale structure and high specific surface area by electrospinning, and studies the effect on NMC morphology caused by calcination atmosphere, oxidation temperature, decarburization temperature and calcination temperature. It is hoped that the polarization can be further eliminated by optimizing the size, and the proportion of double-layer lithium formed in the pre-lithiation can be increased. The results reveal that after several steps including pre-oxidation at 200°C, decarburization at 550°C and calcination at 750°C, nano lamellar structures with size of about 1–3 μm and thickness of about 30 nm can be produced under O2 flow of 200 SCCM. NMC with nano lamellar structures will further alleviate the polarization and produce a higher proportion of double-layer lithium structure by pre-lithiation, resulting in a significant improvement of the discharge capacity.
研究领域:
材料科学
·
电化学
·
储能技术
·
纳米材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）