SOLID STATE IONICS
·
2017
·
IF 2.354
Leyu Zhan,Yao Zhang,Xiangyang Zhuang,Hui Fang,Yunfeng Zhu,Xinli Guo,Jian Chen,Zengmei Wang,Liquan Li
The x LiBH 4 -Li 3 N ( x = 1, 2, 4) composites were investigated on their lithium ionic conductivities . They maintained the original phase structures of orthorhombic LiBH 4 and hexagonal β-Li 3 N during ball milling according to the analyses by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). Electrochemical impedance spectra (EIS) tests showed that LiBH 4 -Li 3 N composites lift the lithium ionic conductivities from that of bulk LiBH 4 by nearly 100 times at low temperature. LiBH 4 -Li 3 N offers 1.06 × 10 − 5 S cm − 1 of conductivity while bulk LiBH 4 possesses only 2.05 × 10 − 7 S cm − 1 at 323 K. Cyclic voltammetry (CV) tests indicated that the voltage window of composites could attain 3 V, which is much more stable than Li 3 N (< 1 V). No thermodynamic incident appears in DSC curves except for the orthorhombic-hexagonal transition endothermic peak of LiBH 4 in the x LiBH 4 -Li 3 N composites. It confirms the phases stabilities of the x LiBH 4 -Li 3 N ( x = 1, 2, 4) composites before and after CV tests. In-situ solid state Nuclear Magnetic Resonance (NMR) tests on LiBH 4 -Li 3 N illustrated that the high conductivity in low temperature should not come from high-temperature phase of LiBH 4 . Therefore, the enhancement of lithium ionic mobility of the composite might be attributed to both Li 3 N and the interfaces between small crystallites where transmission electron microscope (TEM) morphology showed the appearance of amorphous grain boundary.
研究领域:
材料科学
·
固态离子学
·
能源化学
·
电化学
·
纳米材料
·
固体电解质
·
锂离子电池
✓ 已验证
DOI
高影响因子
SOLID STATE IONICS
·
2018
·
IF 2.751
Xue Bai,Wen Li,Aijia Wei,Qian Chang,Lihui Zhang,Zhenfa Liu
Spinel Li 4 Ti 5 O 12 doped with F was synthesized via the solid-state reaction of anatase TiO 2 , Li 2 CO 3 , and NH 4 F. The structural characterization and electrochemical performance evaluation of the prepared materials were carried out utilizing X-ray diffraction, scanning electron microscopy, galvanostatic charge-discharge, electrochemical impedance spectroscopy (EIS), and cyclic voltammetry (CV) tests. The lattice parameters of all samples were calculated using an internal standard and Rietveld refinement method. The results indicate that the F was successfully doped into the lattice structure of Li 4 Ti 5 O 12 , and this process did not influence the crystal structure and superficial morphology. Moreover, the best-performing material, Li 4 Ti 5 O 11.9 F 0.1 delivers superior rate capacities of 165, 162.1, 160.0, 142.3, 125.1, and 99.2 mAh g −1 , at 0.2 C, 0.5 C, 1 C, 3 C, 5 C, and 10 C, respectively, which is higher than those of Li 4 Ti 5 O 12 (150.0, 135.0, 123.5, 93.7, 76.4, and 56.8 mAh g −1 at the same C-rates), and the cycling retention is 82.7% after 150 cycles at 5 C. Meanwhile, the charge-transfer resistance (R ct ) of Li 4 Ti 5 O 11.9 F 0.1 (56.4 Ω) is lower than that of pure Li 4 Ti 5 O 12 (80.6 Ω), and the lithium-ion diffusion coefficients (D Li + ) of Li 4 Ti 5 O 11.9 F 0.1 (2.505 × 10 −10 cm 2 s −1 ) is higher than that of pure Li 4 Ti 5 O 12 (1.694 × 10 −10 cm 2 s −1 ).
研究领域:
材料科学
·
电化学
·
能源存储
·
无机化学
·
固体化学
✓ 已验证
DOI
高影响因子
ELECTROANALYSIS
·
2024
·Vol. 37
·期 1
·e202400287
·
IF 2.7
Qiqi Shu,Qingtang Zhang,Xiaoyu Wu,Zhimin Xie,Chenli Liang,Zhengwei Xie
It is a significant issue to develop silicon/carbon composite anode with high-capacity and long cycling stability for lithium-ion batteries. However, the huge volume expansion of silicon during lithiation leads to severe pulverization of silicon, resulting in serious capacity fading over cycles. Herein, nano silicon integrated hard carbon (20Si@HC, 20 wt% nano silicon) is prepared by pyrolyzing nano silicon in-situ coated a conjugated microporous polymer (CMP). CMP-derived hard carbon coating features developed porous structure, which not only deliver a high lithium storage capacity, but also provide enough space for the volume expansion of nano silicon. When evaluated as an anode for lithium-ion batteries, the 20Si@HC delivers an impressive 1037 mAh g −1 at 0.1 A g −1 and a capacity retention ratio of 72.07% for 100 cycles at 0.6 A g −1 , providing some reference for designing high-capacity silicon/carbon composites.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米复合材料
·
锂离子电池
✓ 已验证
DOI
高影响因子
Discover Nano
·
2024
·Vol. 19
·期 1
·1-13
·
IF 0
Su Kai,Tang Chenxia,Li Chunyue,Weng Shijie,Xiang Yong,Peng Xiaoli
Li 4 Ti 5 O 12 (LTO) batteries are known for safety and long lifespan due to zero-strain and stable lattice. However, their low specific capacity and lithium-ion diffusion limit practical use. This study explored modifying LTO through yttrium doping by hydrothermal method to form Li 4 Y 0.2 Ti 4.8 O 12 nanoparticles. This approach optimized electron and ion transport, markedly enhancing rate and cycle performance. XRD and TEM revealed that Y addition increased interplanar distance of LTO and widened Li + transport pathways. XPS indicated that Y doping augmented the oxygen vacancy concentration and Ti 3+ content. UV tests demonstrated a band gap reduction from 3.72 eV to 2.94 eV, accompanied by enhanced electronic conductivity. EIS tests showed lithium-ion diffusion coefficient remarkably increased to 1.27 × 10 –10 cm 2 s −1 . The initial discharge capacity of Li 4 Y 0.2 Ti 4.8 O 12 at 1 A g −1 reached 198.9 mAh g −1 and retained 89.3% capacity after 1000 cycles. At 6 A g −1 , the discharge capacity was 161.1 mAh g −1 , while at an ultra-high current density of 20 A g −1 , it reached 78.8 mAh g −1 , highlighting its robust rate performance. The yttrium-doped and nano-morphology stabilizes the LTO lattice, enhancing rate performance and cycling stability. This study reveals that LTO has the potential to be used in the high-energy fast-charging storage market. Graphical
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
固态化学
✓ 已验证
DOI
Journal of Energy Chemistry
·
2022
·
IF 13.599
Qinhua Gu,Yujie Qi,Wuxing Hua,Tongxin Shang,Junnan Chen,Luozhen Jiang,Lina Li,Ming Lu,Yixiao Zhang,Xi Liu,Ying Wan,Bingsen Zhang
The shuttle effect caused by soluble lithium polysulfides (LiPSs) deteriorates multiphase transformation reaction kinetics of sulfur species, and gives rise to an unserviceable lithium-sulfur (Li-S) battery. Catalysis, as a process optimization approach, offers an option to eliminate the intrinsic issues. However, exploring and understanding the role of catalysts on electrode reaction remains critical bottlenecks, particularly as they are prone to continuous evolution under complex dynamic environment. Herein, platinum nanoparticles loaded on MXene nanosheets, as sulfur host, and the action of catalysts on the reaction process are investigated via ex-situ monitors upon solid–liquid–solid chemical transformation of sulfur species. These traces confirm that the high performance originates from electron transfer between catalysts and LiPSs, which lowers the nucleation barrier from liquid LiPSs to solid Li 2 S/Li 2 S 2 . Further, the accelerated liquid–solid conversion can alleviate the accumulation of LiPSs, and boost the reaction kinetics in Li-S batteries. The findings corroborate the electronic modulation between catalysts and LiPSs, which is a generalizable strategy to optimize energy conversion efficiency of Li-S batteries.
研究领域:
电化学
·
能源材料
·
纳米催化
·
电池化学
·
表面科学
✓ 已验证
DOI
高影响因子
Journal of Energy Chemistry
·
2020
·
IF 7.216
Ruihan Zhang,Maochun Wu,Xinzhuang Fan,Haoran Jiang,Tianshou Zhao
Currently, lithium-sulfur (Li-S) batteries still suffer from fast capacity decay, poor coulombic efficiency (CE) and short cycling lifespan, which result from the severe shuttle effect issue caused by high solubility and rapid diffusion of lithium polysulfides (LiPSs) in organic electrolytes. Here, yolk-shell zinc oxide (YS-ZnO) spheres are synthesized and for the first time, applied as a host for Li-S batteries to tackle this challenge. The polar ZnO exhibits high chemical anchoring ability toward LiPSs while the unique yolk-shell structure not only provides an additional physical barrier to LiPSs but also enables much more uniform sulfur distribution, thus significantly suppressing LiPSs shuttling effect meanwhile promoting sulfur conversion reactions. As a result, the YS-ZnO enables the Li-S battery to display an initial specific capacity of 1355 mAh g −1 and an outstanding capacity retention capability (~89.44% retention rate) even after 500 cycles with the average CE of ~99.46% at the current of 0.5 C. By contrast, the capacity of conventional-ZnO-nanoparticles based battery severely decays to 472 mAh g −1 after cycling for 500 times. More impressively, the S/YS-ZnO based Li-S battery can maintain a low decay rate of 0.040% every cycle and high average CE of 98.82% over 1000 cycles at 3 C.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
电池技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yonghuan Han,Zhiyuan Sang,Daolan Liu,Tao Zhang,Jianmin Feng,Wenping Si,Shi Xue Dou,Ji Liang,Feng Hou
Lithium metal batteries (LMBs) possess high energy and power density, while the dendrite growth on lithium metal anodes prevents its practical application. And most of the current modification methods only improve from a single aspect, which is difficult to achieve ideal effect of suppressing dendrite in the long cycling with high rate and areal capacity. Herein, a conductive and lithiophilic patch-like V 2 O 3 /VN nanosheet as regulating layer is designed on surface of lithium metal anode (V 2 O 3 /VN-Li) to hinder the dendrite growth. The superior lithiophilicity, fast electron/ion transport of V 2 O 3 /VN nanosheets contribute to a low nucleation overpotential and uniform lithium deposition, thus greatly suppressing the dendrite formation at high current density with repeated plating/stripping. As a result, the V 2 O 3 /VN-Li anode achieves ultra-long life for over 2000 h under ultra-high current density and areal capacity (30 mA cm −2 , 30 mAh cm −2 ). The modified strategy of multifunctional regulating layer on the surface of lithium metal anodes can open a new direction for the realization of high-power and high-energy–density LMBs.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
电池技术
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Xiaowei Wu,Xin Dong,Ziqin Liu,Xinyi Wang,Pu Hu,Chaoqun Shang
Although the Li metal anode has a high theoretical capacity and low potential, the uncontrolled growth of Li dendrites and the significant volume variation of the Li anode prevent the practical deployment of lithium metal batteries (LMBs). To effectively control the Li dendrite growth with suppression, in this contribution, the Ni(OH) 2 nanosheets modified Prussian blue tubes (PBT/Ni(OH) 2 ) are employed to construct a three-dimensional framework (3D) on the surface of Li. The PBT can homogenize the Li + flux, while the Ni(OH) 2 nanosheets provide sufficient space to accommodate the volume change of Li. Thus, the growth of Li dendrites is largely suppressed compared to pristine Li. In detail, with the introduction of PBT/Ni(OH) 2 , the Li||Li cells provide 500 h of consistent cycling performance at 1 mA cm −2 , while the Li||Li 4 Ti 5 O 12 (LTO) cells also exhibit superior cycle reversibility over 450 cycles at 175 mAh g −1 .
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
电池技术
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Kai Chen,Yanping Tang,Shuqing Zhang,Xuxia Hao,Xiaoning Zhao,Li-Qian Cheng,Youxuan Xiao,Zhaoyin Wen
Sulfide all-solid-state lithium battery (ASSLB) with nickel-rich layered oxide as the cathode is promising for next-generation energy storage system. However, the Li+ transport dynamic and stability in ASSLB are hindered by the structural mismatches and the instabilities especially at the oxide cathode/sulfide solid electrolyte (SE) interface. In this work, we have demonstrated a simple and highly effective solid-state mechanofusion method (1500 rpm for 10 min) to combine lithium conductive NASICON-type LiZr2(PO4)3 nanocrystals (∼20 nm) uniformly and compactly onto the surface of the single crystallized LiNi0.8Co0.1Mn0.1O2, which can also attractively achieve Zr4+ doping in NCM811 and oxygen vacancies in the LZPO coating without solvent and annealing. Benefiting from the alleviated interface mismatches, sufficient Li+ ion flux through the LZPO coating, promoted structural stabilities for both NCM811 and sulfide SE, strong electronic coupling effect between the LZPO and NCM811, and enlarged (003) d-spacing with enriched Li+ migration channels in NCM811, the obtained LZPO-NCM811 exhibits superior stability (185 mAh/g at 0.1C for 200 cycles) and rate performance (105 mAh/g at 1C for 1300 cycles) with high mass loading of 27 mgNCM/cm2 in sulfide ASSLB. Even with a pronounced 54 mgNCM/cm2, LZPO-NCM811 manifests a high areal capacity of 9.85 mAh/cm2. The convenient and highly effective interface engineering strategy paves the way to large-scale production of various coated cathode materials with synergistic effects for high performance ASSLBs.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
Carbon Neutrality
·
2023
·Vol. 2
·期 1
·1-11
·
IF 0
Li Xinpeng,Pan Yuxue,Liu Yue,Jie Yulin,Chen Shunqiang,Wang Shiyang,He Zixu,Ren Xiaodi,Cheng Tao,Cao Ruiguo,Jiao Shuhong
High energy density lithium metal batteries (LMBs) have garnered significant research interests in the past decades. However, the growth of lithium dendrites and the low Coulombic efficiency (CE) of Li metal anode pose significant challenges for the development of LMBs. Herein, we report a triethyl orthoformate (TEOF)-based localized high-concentration electrolyte (LHCE) that facilitates a highly reversible Li metal anode with dendrite-free deposition morphologies and an average Coulombic efficiency of 99.1% for 450 cycles. Mechanistic study reveal that the steric hindrance caused by the terminal ethyl groups in the TEOF solvent molecule results in a weak solvating ability, leading to the formation of anion-dominant solvation structures. The anion-dominant solvation sheaths play an essential role in the formation of a LiF-rich solid-electrolyte interphase (SEI), which effectively suppresses the growth of Li dendrites. Furthermore, the TEOF-based electrolyte demonstrates the stable cycling of high-voltage Li||NMC811 cells. These results provide insights into understanding of steric hindrance effect on electrolyte solvation structure and offer valuable guidance for the design of electrolyte solvents in the development of lithium metal batteries.
研究领域:
电化学储能
·
材料科学
·
能源化学
✓ 已验证
DOI
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Haoyang Yuan,Changhao Tian,Mengyuan Song,Wenjun Lin,Tao Huang,Aishui Yu
In the pursuit of high-energy-density lithium batteries, composite solid-state electrolytes are highly favored due to the combination of flexibility and acceptable ionic conductivity. However, challenges such as unpredictable lithium dendrite growth, cathode material structural instability, and oxidative resistance at high voltages pose significant hurdles for solid-state batteries. To investigate the synergistic interactions of polymers and sulfides, a hybrid poly (1,3-dioxolane) and poly (polyethylene glycol diacrylate) blend was designed through in-situ polymerization, allowing LiFePO 4 //Li batteries to achieve an average coulombic efficiency exceeding 99% at 0.5C and stable cycling for at least 1000 h in lithium symmetric cells. Computational analysis and component detection demonstrate the stability of the components and the formation of a LiF-stabilized anode from lithium salt decomposition. Similarly, on the cathode side, when Li 3 PO 4 -coated LiNi 0.6 Co 0.2 Mn 0.2 O 2 is used as the cathode material, a more stable interface suppresses cathode particles' collapse and harmful electrolytes’ decomposition. In ambient environments, after 200 cycles at 0.5C, the capacity retention remains as high as 90.48%. Impedance changes by in-situ methods and component composition were further analyzed. This work integrates multiple methods and stabilizes and validates the anode and cathode interface, providing a promising approach and strategy for designing high-performance sulfide composite solid-state batteries.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2019
·
IF 2.781
Yunjiao Li,Shilei Wang,Yongxiang Chen,Tongxing Lei,Shiyi Deng,Jie Zhu,Jinping Zhang,Jia Guo
Cadmium oxides (CdO), an important semiconductor material , have many superior properties when used as a cathode material for nickel-cadmium batteries. Here, the coating and the doped co-modified LiNi 0.8 Co 0.15 Al 0.05 O 2 cathode are constructed by a continuous wet chemical process and a high-temperature sintering process, wherein the Cd 2+ are uniformly doped in a gradient form and the CdO protective layer is distributed on the outer surface of secondary particles. The Cd-modified NCA material has more stable interfacial and crystal lattice structure, thereby inhibiting harmful phase transitions and side-reactions. Accordingly, the modified sample has excellent electrochemical performance and maintaining a complete spherical morphology during long cycling compared to the pristine sample. In addition, as a pillar ion, cadmium increases the plate spacing and lithium-ion diffusion kinetics. The electrochemical results show that the capacity retention of the modified sample Cd-2000 reached 96.5% and 90.6% after 100 cycles and 200 cycles respectively at 1 C. At the high current rate of 8 C, the initial capacity and retention (100 cycles, 3.0–4.3 V) reach 166.2 mAh g −1 and 95.2%, respectively. Besides, the results of electrochemical impedance spectroscopy (EIS) reveal that CdO modification could decrease the resistance of the cell polarization and impedance increment upon cycling.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机化学
·
半导体材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）