JOURNAL OF POWER SOURCES
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2021
·
IF 9.127
Suwei Mou,Kai Huang,Min Guan,Xiang Ma,Jun song Chen,Yong Xiang,Xiaokun Zhang
LiCoO 2 is the dominantly used cathode material in lithium-ion batteries. However, its high-rate capacity and cyclability are limited, especially under high charging voltages, mainly due to the high Li + diffusion barrier . To solve it, we purpose a doping scheme based on two foreign elements: one is with tremendously large ionic radius and weak electronegativity , and the other one has an ionic radius slightly larger than Co, an electronegativity a little weaker than Co, and a high binding energy with O. Ba and Ga are chosen according to this criterion, and their doping effects are compared with that of La and Al. Briefly, Ba is superior to La in weakening the attraction of O 2- to Li + because of its weaker electronegativity and larger ionic radius. Meanwhile, Ga is more capable of enhancing the structural stability at high voltages than Al mainly due to its higher binding energy with O. LiCo 0.998 Ba 0.001 Ga 0.001 O 2 increases Li + diffusivity from 0.77 × 10 -14 to 1.06 × 10 –13 cm 2 ∙s -1 , resulting in a significantly enhanced rate capacity of 114.3 mAh g -1 at 10 C, much better than pristine counterpart (1.6 mAh∙g -1 ). Additionally, it exhibits a particularly high capacity of 199.3 mAh g -1 , and 85% capacity retention over 100 cycles at 0.5 C in 3.0–4.5 V.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2020
·Vol. 10
·期 4
·740
·
IF 4.324
Le Hu,Chaoqun Shang
Co3V2O8(CVO) with high theoretical specific capacity derived from the multiple oxidation states of V and Co is regarded as a potential electrode material for lithium-ion batteries (LIBs). Herein, reduced graphene oxide (rGO)-supported ultrafine CVO (rGO@CVO) nanoparticles are successfully prepared via the hydrothermal and subsequent annealing processes. The CVO supported on 2D rGO nanosheets possess excellent structural compatibility for the accommodation of volume variation to maintain the structural integrity of an electrode during the repeated lithiation/delithiation process. On the other hand, the rGO, as a highly-conductive network in the rGO@CVO composite, facilitates rapid charge transfer to ensure fast reaction kinetics. Moreover, the CV kinetic analysis indicates that the capacity of rGO@CVO is mainly dominated by a pseudocapacitive process with favorable rate capability. As a result, the rGO@CVO composite exhibits improved specific capacity (1132 mAh g−1, 0.1 A g−1) and promising rate capability (482 mAh g−1, 10 A g−1).Keywords:rGO@CVO;anode materials;rate performance;cycling stability;lithium-ion batteries
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Bo Long,Youlan Zou,Zhaoyang Li,Haiyan Zou,Hengyue Chen
Silicon (Si) with high energy density is identified as the most promising candidate for commercial lithium-ion batteries anodes. Unfortunately, the volume expansion severely damages the battery cycle life during cycling, resulting in fast capacity fading during the battery operation. Herein, a facile design was proposed for the preparation of novel tailored mesoporous Si cages (TMSC) to mitigate this issue. The TMSC material, with mesoporous anamorphic spherical shells and nano-sized Si cores, consists of numerous interconnected channels and forms a half open three-dimensional network. When evaluated as electrode material for lithium-ion batteries, it exhibits the reversible capacity of 931.1 mAh/g after 200 cycles at 1 A/g, which is more stable than that of Si pomegranates with intact shells. Moreover, it displays a high rechargeable capacity of 552.3 mA h/g over 500 cycles at 4 A/g and the capacity decay ratio is only 0.11% for each cycle.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2022
·Vol. 15
·期 4
·1669-1675
·
IF 8.307
Xiao Liu,Shuai Zhang,Peng Zhang,Zongmin Zheng,Feng Bai,Qi Li
Tin dioxide (SnO2) with a high theoretical capacity of 1494 mA h g−1 has great potential to break through the capacity limitation of the conventional graphite anode (372 mA h g−1) in lithium-ion batteries. However, its practical application still faces several obstacles such as high volumetric expansion and poor electrical conductivity. To solve these problems, innovative design and synthesis of SnO2-based nanocomposite structures are necessary. Herein, we demonstrate an integrated design of a hierarchical pitaya-like P-SnO2/C@NC core–shell nanostructure which includes the core of SnO2 nanoparticles (∼4–12 nm) uniformly embedded in the porous carbon sphere and the shell of a continuous nitrogen-doped carbon (NC) layer. Specifically, during repetitive lithiation and delithiation processes, the ultrasmall SnO2 nanoparticles reduce the internal stress greatly, the porous carbon matrix provides buffer space for a large volume change, and the N-doped carbon shell further guarantees the whole structure unit sufficient electrical conductivity and structural stability. Consequently, the resultant battery exhibits a reversible capacity of 936.8 mA h g−1 after 100 cycles at 100 mA g−1 and even an average capacity of 460.0 mA h g−1 at a high current density of 3.2 A g−1. The excellent electrochemical performance of pitaya-like SnO2/C@NC proves the efficacy of this structure design and thus provides significant reference for the construction of other electrode materials in rechargeable alkali metal ion batteries.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Tianyu Zhu,Cuiping Yu,Yucheng Wu,Yan Wang
The capacity of Li4Ti5O12 (LTO) at high rates is limited due to the polarization caused by its modest Li-ion (Li+) diffusion coefficient and low electrical conductivity. Coating with ionic conductors is an available method to ameliorate charge transport. Li1+xAlxTi2–x(PO4)3 ion conductors with thermal, chemical, and electrochemical stabilities have been proven to be modification materials for electrodes. Herein, the Li1.4Al0.4Ti1.6(PO4)3 (LATP) precursor dispersion with optimized preparation is applied to the surface modification of LTO by a dynamic mix-drying method. A proper amount of LATP ultrafine particle coating could develop the ion transport rate in the electrode and restrain side reactions. The 2 wt % LATP–LTO anode exhibits an optimized capacity of 168.2 mA h g–1 at 0.1 A g–1 and retains 96.7% of its capacity after 5000 cycles at 5.0 A g–1, while the P-LTO anode retains 86.3% of the capacity. Improved Li+ transport and interface stability in the electrodes lead to the boosted rate and cycling stability. The LATP-modified LTO composites provide a possibility for the further application of related materials in the energy storage field.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2023
·Vol. 15
·期 47
·19159-19167
·
IF 6.7
Miaoxin Di,Zhenqi Song,Suhua Chen,Ying Bai
Transition metal sulfides (TMSs) have drawn promising attention due to their low cost and high theoretical capacity for sodium storage. However, the critical issues of TMSs with huge volume changes and lower ionic/electronic conductivity are the major challenges for their practical application in sodium-ion batteries. Herein, we constructed cobalt-doped ZnS encapsulated in an N-doped carbon shell (denoted as Co-ZnS@NC), which effectively alleviates the volume expansion and improves sodium storage performance. The mechanism analysis and ion diffusion kinetics analysis (GITT, EIS, and CV) prove the acceleration of Na+ diffusion by the built-in electric field and buffer carbon layer in the Co-ZnS@NC, optimizing the cycle life and rate capability. The as-prepared Co-ZnS@NC has a high reversible capacity of 456.8 mA h g−1 after 1000 cycles at 1.0 A g−1 and superior rate capability (368.8 mA h g−1 at 20.0 A g−1), with Na metal as the counter electrode. Moreover, the assembled full cell shows a high energy density of 214.4 W h kg−1. This work provides insight on heteroatom doping for optimizing the rate capability of TMS anodes.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Shunchao Wang,Xin Pang,Dequan Huang,Man Zhang,Sijiang Hu,Youguo Huang,Fenghua Zheng,Hongqiang Wang,Qingyu Li,Qichang Pan
Cobalt sulfide (Co 9 S 8 ) is a promising anode material for sodium-ion batteries (SIBs) due to its high theoretical capacity, cost-effectiveness, and environmental friendliness. Unfortunately, the inevitable structural deterioration induced by the huge volume changes during the discharge/charge cycles leads to poor cycle performance and rate capability when evaluated as the anode material for SIB. Herein, we designed a Co 9 S 8 @C-MoS 2 heterostructure with abundant heterointerface and hollow structure. In the designed hybrid architecture, the self-supporting hollow carbon scaffold can provide sufficient space for volume expansion caused by Na + insertion, and the abundant heterointerface can accelerate ion-diffusion and electron transfer kinetics and dissipate the internal stress induced by volume expansion during the sodiation/desodiation process. As expected, the Co 9 S 8 @C-MoS 2 composite shows excellent sodium storage performance. Specifically, the Co 9 S 8 @C-MoS 2 composite displays excellent long-term cycling life (a high capacity of 429.4 mAh g −1 is maintained after 1500 cycles at 5.0 A/g), and superior rate performance (412.6 mAh g −1 is achieved even at 10.0 A/g).
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Jing Sun,Jing Li,Yuanyuan Liu,Kaihua Liu,Meiri Wang,Hongtao Cui
Ni(OH) 2 is a typical battery-type material with high theoretical specific capacity. Its two inherent disadvantages, namely slow electrochemical dynamics and extremely poor cycling life, have become stumbling blocks for its application in supercapacitors (SCs). The hitherto slow advancement in the electrochemical performance of Ni(OH) 2 implies a misunderstanding of its electrochemical mechanism and inappropriate building strategies of the structure. In this work, we build a structure of porous carbon-confined α-Ni(OH) 2 using Mg-MOF-74 as a sacrificial template. The carbon matrix acts as the conductive network and the porous substrate for self-healing the damaged structure caused by the dissolution-precipitation of α-Ni(OH) 2 and suppressing the dissolution-recrystallization behavior of β-Ni(OH) 2 transformed from α-Ni(OH) 2 . Due to the thin sheet morphology and the retention of this morphology throughout cycling, the porous carbon-confined Ni(OH) 2 demonstrates excellent high-rate performance, and an ultra-long cycling life comparable to the carbon materials of electrical double layer capacitors (EDLCs). The assembled SCs also exhibit a high power density of 10.8 kW kg −1 and an energy density of 40.9 Wh kg −1 . The positive result in this work may offer a promising strategy for obtaining SCs with both high energy and power densities.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Hui Chang,Hongkai Hu,Weiya Li,Guohong Kang,Vladimir G. Sergeyev,Wei Liu,Yongcheng Jin
The advancement of solid-state lithium metal batteries (SSLMBs) with high rate capability possess challenges due to the relatively slow kinetics of ion transport properties and the lack of compatibility between the phases derived from solid-state electrolytes. Here, the tris(pentafluorophenyl) boron (TPFPB) is incorporated as an highly effective additive into a poly(ionic liquid)-based solid-state composite polymer electrolyte (CPE) to realize SSLMBs with enhanced high rate performance. The theoretical calculation and experimental analysis demonstrated that the TPFPB serves as an anion receptor agent and a modifier of the electrode/electrolyte interphase. In a notable advancement, the ionic conductivity, lithium transport kinetics, and electrochemical stability of CPE have been significantly enhanced. Additionally, TPFPB has demonstrated an impressive capacity to suppress undesirable side reactions with both the cathode and lithium anode. The presence of Li 2 O, Li 2 CO 3 and an adequate amount of LiF derived from TPFPB in the interphase between the CPE and Li metal anode results in enhanced high-rate performance. The reasonable design enables the achievement of a considerable ion conductivity of 5.28 × 10 −4 S cm −1 (25 °C) and a lithium-ion transference number of 0.48 for CPE. The solid-state LiFePO 4 /CPE/Li batteries delivers excellent rate performance and cycle stability, with a high discharge specific capacity of 94.4 mAh g −1 at 10 C (1 mA cm −2 ) and a remarkable capacity retention of 76.5 % after 700 cycles at 8 C. Moreover, the TPFPB functionalized CPE is capable of operating in conjunction with the high-voltage LiNi 0.85 Co 0.15 Al 0.05 O 2 cathode. The excellent performance of the as-prepared SSLMBs at a wide temperature range of −15 °C and 60 °C also verified that the effectiveness of TPFPB as additives into solid-state electrolytes.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 11
·2679
·
IF 3.1
Tongtong Chen,Xianying Han,Mengling Jie,Zhiwu Guo,Jiangang Li,Xiangming He
Na4Fe3(PO4)2P2O7/C (NFPP) is a promising cathode material for sodium-ion batteries, but its electrochemical performance is heavily impeded by its low electronic conductivity. To address this, pure-phase Mo6+-doped Na4Fe3−xMox(PO4)2P2O7/C (Mox-NFPP, x = 0, 0.05, 0.10, 0.15) with the Pn21a space group is successfully synthesized through spray drying and annealing methods. Density functional theory (DFT) calculations reveal that Mo6+doping facilitates the transition of electrons from the valence to the conduction band, thus enhancing the intrinsic electron conductivity of Mox-NFPP. With an optimal Mo6+doping level of x = 0.10, Mo0.10-NFPP exhibits lower charge transfer resistance, higher sodium-ion diffusion coefficients, and superior rate performance. As a result, the Mo0.10-NFPP cathode offers an initial discharge capacity of up to 123.9 mAh g−1at 0.1 C, nearly reaching its theoretical capacity. Even at a high rate of 10 C, it delivers a high discharge capacity of 86.09 mAh g−1, maintaining 96.18% of its capacity after 500 cycles. This research presents a new and straightforward strategy to enhance the electrochemical performance of NFPP cathode materials for sodium-ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Materials Today Energy
·
2018
·
IF 0
De Gao,Rui Du,Chenggang Zhou,Bo Han,Kaisheng Xia,Qiang Gao,Jinping Wu
Transition metal cyanides are considered as a promising cathode candidate of sodium-ion batteries. Herein, we reported a direct implementation of commercial K 3 Fe(CN) 6 (KFC) as active cathode material of SIBs by a simple recrystallization method. Our results suggest that by integrating conductive carbons (SuperP, abbreviated as SP) and multi-walled carbon nanotubes (CNTs) with KFC, an efficient conducting network could be well established for the utilization of KFC active components, thereby endows excellent cyclic and rate performances. Specifically, the KFC/SP/CNTs composite delivers its theoretical capacity of 81 mAh g −1 at 0.1C, and a reversible capacity of 75.6 mAh g −1 at 1C which maintains 62.6 mAh g −1 after 500 cycles. At ultrahigh rate of 12C, the capacity retention can reach 68% of initial. Our effort suggests that direct implementing industrial KFC as cathode materials for SIBs is highly feasible, which may provide a low-cost cathode candidate of sodium-ion batteries for large-scale energy storage.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
Inorganic Chemistry Frontiers
·
2023
·Vol. 10
·期 4
·1176-1186
·
IF 7
Yue Xu,Yang Li,Yong Qian,Shanshan Sun,Ning Lin,Yitai Qian
Silicon monoxide (SiO) is regarded as a promising material to replace traditional graphite anode in the next generation lithium-ion batteries. However, the huge volume expansion and poor ionic/electronic conductivity of SiO particles largely restrict its application in the fast charging and discharging process. Herein, a deficient TiO2−x coated porous SiO structure was designed through the Ag-assisted chemical etching process followed by a hydrolysis approach. Within this composite, the internal pores of SiO particles could accommodate the irregular volume change and also shorten the diffusion pathway of lithium ions. Moreover, the outer TiO2−x could provide a protective shell and favor the generation of stable SEI films. In addition, the large specific surface area increases surface active sites and promotes the electrochemical reaction of lithium ions during the high-rate lithiation/de-lithiation process. As a result, the synthesized porous SiO/TiO2−x composites delivered a high capacity of 501.2 mA h g−1 with a capacity retention of 52.41% at a current density of 1.0 A g−1 after 300 cycles. Even at 2.0 A g−1, it maintained a reversible capacity of 423.4 mA h g−1 after 500 cycles. Finally, a full cell composed of porous SiO/TiO2−x composites and commercial LiCoO2 presented a distinctive enhancement in energy density compared with that of a pure SiO anode. A series of characterization analyses and electrochemical measurements were performed to disclose the mechanism for the superb performance of materials.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）