ChemElectroChem
·
2019
·Vol. 6
·期 17
·4637-4644
·
IF 3.975
Lei Zhang,Hongyu Wang
Graphical Double time : It is demonstrated that the concentrated solution of 3 M LiPF 6 -ethyl methyl carbonate/trimethyl phosphate (7 : 3 by vol.) is also compatible with graphite negative and works well for full dual-graphite batteries. Although trimethyl phosphate (TMP)-based electrolyte solutions are effective to resist flames in non-aqueous electrical energy storage devices, they are usually not so compatible with Li-graphite negative electrodes. Herein, we solve this problem by increasing the concentration of LiPF 6 salt in the solution. A benchmark graphite negative electrode (MCMB, mesocarbon microbeads) can deliver a capacity over 325 mAh g −1 and maintain good cyclability in a solution of 3 M LiPF 6 -ethyl methyl carbonate (EMC)/TMP (7 : 3 by vol.). Moreover, our previous work has confirmed that the graphite positive electrode also works very well in the above solution. Therefore, this solution can cater to both anion-graphite and Li-graphite intercalation electrodes, which enables the construction of dual-graphite batteries (DGBs). There are some problems arising during the DGB operation, and corresponding strategies are proposed.
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
Energy Storage Materials
·
2019
·
IF 0
Tao Dai,Lie Yang,Xiaohui Ning,Danli Zhang,R. Lakshmi Narayan,Ju Li,Zhiwei Shan
Due to their compactness, storage/supply flexibility, modularity and factory manufacturability, batteries are excellent candidates for large scale energy storage applications . However, the widespread application of most batteries hitherto developed is hindered by their high cost. Here, an intermediate temperature molten salt battery is developed that emphatically resolves this issue by using all earth-abundant and cheap elements. Operated at 170 °C, the cell comprises of an Fe metal anode, NaCl saturated NaAlCl 4 electrolyte and an AlCl 4 − intercalated graphite cathode in the fully charged state. It has a capacity retention of 85% after nearly 10,000 cycles. After characterizing the anode, it was determined that the high reversibility of the Fe to FeCl 2 solid state transformation are responsible for the absence of dendritic growth on such a metal anode. Different electrode capacity matching strategies are discussed in the context of ensuring safe operation during overcharging. Finally, the overall material cost of the Fe/Graphite cell is estimated to be 33.9 $ kWh −1 , which can potentially meet the demands of the commercial energy storage market.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
ChemElectroChem
·
2022
·Vol. 9
·期 24
·e202200884
·
IF 4.782
Li Zhang,Ziqiang Liu,Gaowei Wang,Wangjun Feng,Xiaoyun Wang,Jianze Feng,Xiaqing Zhang,Hongyun Ma,Xu Zhang,Yongtai Xu,Siyuan Yao,Yunxia Ding,Kailimai Su,Xingbin Yan
Graphical Dual Graphite Batteries : Based on the decomposability of potassium oxalate monohydrate (K 2 C 2 O 4 ⋅H 2 O) as positive additive, it can provide extra cations to support a stable negative interface and suppress the anion-cation crosstalk. The as-constructed DGBs with K 2 C 2 O 4 ⋅H 2 O deliver high-rate capability (31.8 mAh g –1 at 3.0 C) and excellent cyclic stability (∼84.1 % capacity retention after 180 cycles). Due to their merits of affordability, safety, and environmental friendliness, dual graphite batteries (DGBs) have drawn widespread interest as novel energy storage devices. Nevertheless, the development of DGBs is plagued by inferior cyclic stability that arise from the irreversible loss of cations and the anion-cation crosstalk during the formation of an negative interface. We proposed an in-situ sacrificial positive additive strategy to enhance the electrochemical performances, based on the decomposability of potassium oxalate monohydrate (K 2 C 2 O 4 ⋅H 2 O). The experimental and computational results show that the positive additive can add cations to support a stable negative interface and suppress the anion-cation crosstalk. The as-constructed DGBs with K 2 C 2 O 4 ⋅H 2 O deliver high-rate capability (31.8 mAh g −1 at 3.0 C) and excellent cyclic stability (∼84.1 % capacity retention after 180 cycles). This work provides a new opportunity of negative interface construction for propelling the commercial evolution of the advanced DGBs.
研究领域:
能源材料
·
电化学
✓ 已验证
DOI
高影响因子
Energy Technology
·
2017
·Vol. 5
·期 11
·1979-1989
·
IF 2.789
Chunguang Pang,Gaojie Xu,Weizhong An,Guoliang Ding,Xiaochen Liu,Jingchao Chai,Jun Ma,Haisheng Liu,Guanglei Cui
The effectiveness of multicomponent functional additives on the performances of lithium ion batteries has received increasing attention. Tris(2 H -hexafluoroisopropyl) borate (THFPB) additive can totally suppress the appearance of a crystallized complex between LiPF 6 and adiponitrile (ADN). Herein, ADN, THFPB, and cyclohexylbenzene are demonstrated to be an effective three-component functional additive in LiPF 6 -based carbonate electrolyte that improves the cyclability and rate capabilities of LiCoO 2 /graphite full cells charged to 4.4, 4.45, and 4.5 V, respectively. By systematic characterization, it is demonstrated rationally that, with the help of the three-component functional additive, the electrolyte is stabilized and new types of less resistant, thinner, more protective solid–electrolyte interfaces are constructed simultaneously on the surfaces of both electrodes.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
IONICS
·
2023
·Vol. 29
·期 4
·1381-1393
·
IF 2.8
Zeng Yong,Wang Keliang,Ke Xiang,Tan Xiaoqing,Jiang Bo,Zhu Weichen,Xiao Rengui
Compared with Li-ion batteries, dual-graphite batteries (DGBs) have low cost, easy handling, and renewable advantages. However, DGBs with pure ionic liquid as the electrolyte (LEDGBs) suffer from high self-discharge rate (SDR). Here, a gel polymer electrolyte (ILGPE) was prepared using polyvinylidene fluoride as the polymer matrix and 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide as the electrolyte and assembled into a gel polymer double-graphite battery (IGDGB). The results show that the IGDGB has an initial discharge capacity of 34.9 mAh g -1 , and SDR is only 3.63%/h lower than the LEDGB (25.07%/h) after resting for 3 h. Notably, even after resting for 10 h, the IGDGB still has a discharge capacity of 27.5 mAh g -1 . Meanwhile, the electrochemical impedance spectroscopy analysis results indicate that the low SDR of IGDGB is due to the limiting effect of ILGPE on the carrier strength. This result provides an idea of self-discharge reduction strategy for other electrochemical energy storage systems with intercalation storage mechanism.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
IONICS
·
2022
·Vol. 28
·期 9
·4103-4110
·
IF 2.961
Liu Hui,Zhu Weichen,Zhou Hongyan,Wang Jianzhong
The development of dual-ion metal-free batteries is restricted by the strong self-discharge effect and dissolution of some anode active materials in the polar electrolyte. This in turn leads to low coulombic efficiency and discharge capacity loss. It is of great significance to alleviate this phenomenon through the redox reactions of polymeric active materials. In this study, a metal-free poly(anthraquinonyl sulfide)-graphite battery was constructed based on a pure N -butyl- N -methylpiperidinium bis(trifluoromethylsulfonyl)imide ionic liquid electrolyte. The cell had a discharge capacity of 70.5 mAh g −1 (0.1 C) and a capacity retention rate of 98.6% after 100 cycles, with a coulombic efficiency of 98.3% (1 C). Comparative studies proved that the self-discharge effect of poly(anthraquinonyl sulfide)-graphite batteries is weaker than that of some dual-graphite batteries. Cyclic voltammetry experiments revealed that the redox reaction was highly reversible. Most significantly, this type of poly(anthraquinonyl sulfide)-graphite batteries provides a new way for the design of metal-free dual-ion batteries with excellent long-term cycling performance and minimal self-discharge effect. Graphical abstract
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2021
·
IF 9.127
Jingxiong Gao,Songyi Han,Haiming Hua,Jie Wu,Jing Zeng,Yuanyu Sun,Weiping Tang,Shuling Liu,Jinbao Zhao
To optimize the electrochemical behavior of NCM-based high-energy lithium-ion batteries (LIBs) in wide temperature ranges, Phenyl trifluoromethane sulfonate (PTM) is demonstrated as the novel electrolyte additive to enhance the electrochemical behavior of LiNi 0·6 Co 0·2 Mn 0·2 O 2 /graphite cells at 25 °C, −20 °C and 45 °C. The cells with 1.0 wt% PTM-containing electrolyte deliver 80.6% capacity retention after 350 cycles at 25 °C, 73.4% after 100 cycles at −20 °C, and 82.6% after 300 cycles at 45 °C, which are significantly higher than that in standard electrolyte (STD), corresponding to 36.4% at 25 °C, 40.3% at −20 °C, and failure at 45 °C, respectively. According to density functional theory (DFT) simulations and quantitative calculations, the PTM preferentially reduces on the anode and oxidizes on the cathode to participate in the formation of solid electrolyte interphase (SEI) films. In addition, the scanning electron microscopy (SEM), Transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS) and other analysis suggest that the formed SEI films are thinner and more stable for the electrolyte containing PTM, and the formed SEI films effectively control the decomposition of carbonate-based electrolytes and greatly decrease the increased resistance during the cycle.
研究领域:
电化学
·
材料科学
·
能源存储
·
锂电池技术
·
界面化学
✓ 已验证
DOI
高影响因子
Energy Technology
·
2018
·Vol. 6
·期 11
·2172-2178
·
IF 3.175
Aiye Wang,Wenhui Yuan,Jiaxin Fan,Li Li
Rechargeable dual-ion batteries are considered to be potential candidates for applications in electrochemical energy storage devices. Ionic liquid is one of the most promising electrolytes due to its superior ionic conductivity and the wide electrochemical window. In this work, a novel dual-graphite battery system was developed based on a pure 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl) imide ionic liquid electrolyte and dual graphite electrodes. The working mechanism of the dual-graphite battery based on a pure ionic liquid electrolyte without any metallic elements was proposed and investigated in detail. The cell delivers a reversible specific capacity of 49 mAh g −1 at a current density of 50 mA g −1 , a high Coulombic efficiency of approximately 97.4 % and a fine cycling stability at high cut-off voltage 4.6 V over 100 cycles. Moreover, the dual-ion battery system, which is made entirely of non-metallic elements, exhibits a high and obvious discharge voltage plateaus at about 3.7 V. These results encourage the further development of new types of futuristic rechargeable non-metallic battery energy storage systems.
研究领域:
电化学
·
能源材料
·
储能技术
·
物理化学
·
先进电池
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2021
·
IF 9.127
Huajun Zhao,Yunxian Qian,Guangfu Luo,Jian Chang,Chaoyang Wang,Jun Wang,Huaiyu Shao,Yonghong Deng
LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) cathode coupling with artificial graphite (AG) is a promising tendency for high-energy-density batteries . However, realization of long-term lifespan under current realistic conditions remains a “Gordian knot” for large-scale commercialization-oriented realm owing to the aggressive and highly reactive Ni 4+ sites on the delithiated cathodes and electrolyte exhaustion. Vinylene carbonate (VC) is commonly employed as the additive for graphite anode in carbonate electrolytes. However, VC has limited protection ability for NCM811/AG, especially for high-temperature cycling, showing conspicuous gas generation and large interfacial resistance . Herein, advanced carbonate-based electrolytes containing vinylene carbonate (VC) and phosphate compounds like triallyl phosphate (TPPC2) and tripropargyl phosphate (TPPC3) as electrolyte additives are reported to improve the performance of NCM811/AG pouch cells at elevated temperature. Theoretical calculations and comprehensive characterizations reveal that these two electrolytes well regulate the electrodes interface with more robust and homogenous films. Moreover, the TPPC2 and TPPC3 additives exhibit stronger tendency to eliminate the corrosive active oxygen ( 1 O 2 ) released from NCM811. These merits mitigate the electrolyte decomposition, decrease the gas generation, inhibit the dissolution of transition metals from cathode, and protect the structure stability of NCM811. Such outstanding electrochemical performance reveals promising prospects in the commercialized application of NCM811/AG batteries .
研究领域:
电化学
·
材料科学
·
能源存储
·
锂离子电池
·
界面化学
·
电极材料
·
电解质工程
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Wenlian Wang,Tianxiang Yang,Shuai Li,Jing Lu,Xiaoyang Zhao,Weizhen Fan,Chaojun Fan,Xiaoxi Zuo,Shaolong Tie,Junmin Nan
Lithium-ion batteries (LIBs) with high-nickel ternary material cathode can provide a high specific capacity but are more sensitive to the H 2 O/HF contents and functional additives in the electrolyte. In this work, 1,4-phenylene diisocyanate (PPDI) is developed as an H 2 O/HF scavenger and film-forming electrolyte additive to enhance the performances of pouch LiNi 0 · 6 Co 0 · 2 Mn 0 · 2 O 2 (NCM622)/graphite batteries. Compared with batteries containing the blank electrolyte, the electrochemical performances of batteries with the PPDI-containing electrolyte can be significantly improved. Thereinto, after 600 cycles at room temperature (25 °C) and 300 cycles at high temperature (45 °C), the capacity retentions for the batteries with the PPDI-containing electrolyte are 84.9% and 81.3% at 1C, while the rates for the batteries with the blank electrolyte are only 29.3% and 14.4%, respectively. With the aid of theory calculations and spectroscopic characterization, the reasons behind the performance enhancement are elucidated, and the reaction mechanism of PPDI and H 2 O/HF is proposed. It is demonstrated that PPDI can scavenge H 2 O/HF in the electrolyte and form stable and highly conductive films on two electrodes to stabilize NCM622 and improve battery performances. Besides the functionalized electrolyte, this work can also inspire new ideas to develop functionalized electrolytes for high-performance NCM622-based LIBs.
研究领域:
材料科学
·
电化学
·
能源存储
·
电池技术
✓ 已验证
产品关联
DOI
高影响因子
ChemElectroChem
·
2019
·Vol. 6
·期 17
·4681-4688
·
IF 3.975
Yu Huang,Rengui Xiao,Zhiming Ma,Weichen Zhu
Graphical In sync : The 1-ethyl-3-methylimidazolium trifluoromethanesulfonate (EMImTfO) dual-graphite battery exhibits a high discharge plateau above 3.0 V, which originates from the synchronized de-intercalations of EMIm + and TfO − from the graphite cathode and anode, respectively. The battery can light up a red LED with 3.0 V standard voltage. In this work, a novel dual-graphite battery (DGB) based on a pure 1-ethyl-3-methylimidazolium trifluoromethanesulfonate (EMImTfO) ionic liquid electrolyte is constructed. Within a charge/discharge voltage range of 1.0–3.9 V and at a current of 400 mA g −1 , batteries with dual-natural-graphite electrodes exhibit a high discharge plateau above 3.0 V with an initial discharge capacity of 46.2 mAh g −1 , delivering a capacity retention of 71.0 % after 100 cycles. Comparative studies between the natural graphite and the synthetic graphite (KS6) electrodes are also conducted. Charge-discharge tests reveal that the dual natural-graphite battery presents a higher discharge voltage plateau and better retention than the dual KS6-graphite battery. To confirm the principle of the dual-graphite systems, a cyclic voltammetry test is conducted. The results demonstrate that the EMIm + cation exhibits an even more stable intercalation/de-intercalation behavior than the TfO − anion. Further tests, including ex situ X-ray diffraction and ex situ Raman spectroscopy, are performed to reveal the mechanism of TfO − and EMIm + intercalation into graphite, both demonstrating a reversible process.
研究领域:
电化学
·
电池技术
·
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CHEMISTRY
·
2020
·Vol. 39
·期 1
·157-164
·
IF 3.826
Dan Han,Mao-Sheng Cao,Na Li,Dong-Mei She,Wei-Li Song,Haosen Chen,Shuqiang Jiao,Daining Fang
Main observation and conclusion Graphitic materials with intercalated sites are considered as the mostly used positive electrode materials in nonaqueous Al batteries. Unlike the small-size cations, the intercalation/de-intercalation of large-size anions into/out of graphite would induce large volume expansion and micro-structure reconfiguration, leading to unexpected coulombic efficiency in the full cells (<95% within initial several cycles). For understanding the irreversible processes induced by anion intercalation/de-intercalation (AlCl 4 – ), here the kinetics of first two cycles for the Al-graphite batteries have been systematically studied. To study kinetics behaviors at representative states, a combined method upon galvanostatic intermittent titration technique and electrochemical impedance spectroscopy has been carried out. The achieved diffusion coefficients of the positive electrodes assembled with different graphite sizes suggest that size effect also plays a critical role in determining the electrochemical kinetics in the mass transport in both electrolyte and graphitic layers as well as in interface reaction. The morphologies and micro-structures of the post-cycled graphite electrodes have been also experimentally studied, which also well supports the irreversible intercalation/de-intercalation behaviors in graphite electrodes. The results offer a significant platform to well understand the essential factors in tailoring coulombic efficiency from a kinetic view, which would be helpful in promoting the graphite electrodes in Al batteries.
研究领域:
材料科学
·
电化学
·
电池技术
✓ 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）