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Chen M.,Key Laboratory for Green Chemical Technology | Wang C.,Key Laboratory for Green Chemical Technology | Niu X.,Tianjin Lishen Battery Joint Stock Co. | Zhao S.,Key Laboratory for Green Chemical Technology | And 2 more authors.
International Journal of Hydrogen Energy | Year: 2010

Direct carbon fuel cell (DCFC) is a kind of high temperature fuel cell using carbon materials directly as anode. Electrochemical reactivity and surface property of carbon were taken into account in this paper. Four representative carbon samples were selected. The most suitable ratio of the ternary eutectic mixture Li2CO3-K2CO3-Al2O 3 was determined at 1.05:1.2:1(mass ration). Conceptual analysis for electrochemical reactivity of carbon anode shows the importance of (1) reactive characteristics including lattice disorder, edge-carbon ratio and the number of short alkyl side chain of carbon material, which builds the prime foundation of the anodic half-cell reaction; (2) surface wetting ability, which assures the efficient contact of anode surface with electrolyte. It indicates that anode reaction rate and DCFC output can be notably improved if carbon are pre-dispersed into electrolyte before acting as anode, due to the straightway shift from cathode to anode for CO3 2- provided by electrolyte soaked in carbon material. © 2009 Professor T. Nejat Veziroglu.

Bai Y.,Beijing Institute of Technology | Wu F.,Beijing Institute of Technology | Yang H.-T.,Tianjin Lishen Battery Joint Stock Co. | Zhong Y.,Patent Examination Cooperation Center | Wu C.,Beijing Institute of Technology
Advanced Materials Research | Year: 2012

Spinel LiMn 2O 4 was modified with Y 2O 3 coating by a chemical process. The crystal structures of the as-prepared samples were investigated by X-ray diffraction (XRD). The charge/discharge characteristics of the modified samples were evaluated at different rates between 3.0 and 4.4V. The discharge capacities of 2.0 wt.% Y 2O 3-coated LiMn 2O 4 are 116 mAh·g -1, 99.7mAh·g -1, 93.3mAh·g -1 and 82.9mAh·g -1 at 0.1C, 0.5C, 1C and 2C rates (at 20°C). The cycle abilities improvement of the spinel LiMn 2O 4 coated with Y 2O 3 are demonstrated at elevated temperature (55°C) and high rates (2C). From the analysis of electrochemical impedance spectroscopy (EIS), the improvement of cycle ability may be attributed to the suppression on the formation of the passivating films and the reduction of Mn dissolution, which result from the surface modification with Y 2O 3.

Zhang J.,Tianjin Polytechnic University | Wu H.,Tianjin Lishen Battery Joint Stock Co. | Wang J.,Tianjin Polytechnic University | Shi J.,Tianjin Polytechnic University | Shi Z.,Tianjin Polytechnic University
Electrochimica Acta | Year: 2015

Lithium-ion capacitors (LICs) are assembled with activated carbon (AC) cathode and pre-lithiated mesocarbon microbeads (MCMB) anode. For ensuring the electrochemical performance of LIC, the pre-lithiation capacity of MCMB anode is designed to make the anode at the two lithium ion intercalation plateaus. The utilization of the two plateaus greatly affects the charge-discharge process and behavior at different working potential ranges of LIC, which achieves the regulation of the electrochemical performance. LIC150 using the first plateau of MCMB anode exhibits higher power density and superior cycle performance, and LIC300 using the second plateau of MCMB anode shows higher energy density. The two plateaus utilization of the MCMB anode can be further increased by improving the working potential range. LIC150 and LIC300 display the optimal electrochemical performance at the working potential range of 2.0-4.0 V. LIC150 exhibits high power density of 6.3 kW kg-1 and the energy density up to 62.9 Wh kg-1, capacity retention of 93.4% after 1000 cycles. Besides, the energy density of LIC300 is up to 92.3 Wh kg-1, the power density as high as 5.5 kW kg-1 and excellent capacity retention of 97.0% after 1000 cycles. © 2015 Elsevier Ltd. All rights reserved.

Luo Y.,Tianjin Polytechnic University | Li Q.,Tianjin Lishen Battery Joint Stock Co. | Song S.,Tianjin University
Anti-Corrosion Methods and Materials | Year: 2014

Purpose: The purpose of this investigation was to study the erosion-corrosion behavior of ZHMn55-3-1 copper alloy in seawater (flow velocity from 0 to 0.8 m/s, sediment content from 0 to 0.15 percent), to analyze the effects of the flow velocity and sediment content on the erosion-corrosion process. Design/methodology/approach: A simulated erosion-corrosion test system was set up. Weight loss determinations and electrochemical measurements (such as potentiostat square wave (PSW), electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization tests) were used to study the erosion-corrosion behavior of ZHMn55-3-1 copper alloy in stagnant and flowing seawater with different sediment contents. Findings: Under the test conditions, ZHMn55-3-1 copper alloys had good corrosion resistance to stagnant clear seawater, while increasing the flow velocity and sediment content reduced the corrosion resistance of the material. The difference in the erosion-corrosion mechanism between flow velocity and sediment content was that the former affected both the cathode process and the anode process of electrochemical corrosion, while the latter essentially affected only the anode process. Originality/value: This paper explains the effects of flow velocity and sediment content on the erosion-corrosion behavior of ZHMn55-3-1 copper alloy in flowing seawater. © Emerald Group Publishing Limited.

Zhao L.,Beijing Institute of Technology | Zhao L.,Tianjin Lishen Battery Joint Stock Co. | Wang W.,Beijing Research Institute of Chemical Defense | Wang A.,Beijing Research Institute of Chemical Defense | And 4 more authors.
Journal of Power Sources | Year: 2013

A novel polymer, poly(5-amino-1,4-dyhydroxy anthraquinone) (PADAQ) as the cathode material of lithium batteries is synthesized by a facile oxidation process and characterized by FT-IR, MS, elementary analysis, XRD, SEM and electrochemical method. The results show that the as-prepared polymer solves the problems of dissolution and crystallization of its monomer, 5-amino-1,4-dyhydroxy anthraquinone (ADAQ), thus maintains the stability of the electrode structure successfully. At the cutoff voltage of 1.5-3.7 V, the initial discharge capacity of PADAQ is 101 mAh g-1 at the current density of 400 mAh g-1. After 14 cycles, the capacity increases to 143 mAh g-1, and maintains 129 mAh g-1 after 50 cycles, which shows an improved cycle performance compared to its monomer. Even at the high current density of 1400 mAh g-1, its capacity still reaches 95 mAh g-1, indicating a high rate capacity. The results also show that PADAQ is sensitive to discharge depth. When discharged to 1.0 V, its cycle performance is poor. © 2013 Published by Elsevier B.V.

Quiroga-Gonzalez E.,University of Kiel | Bensch W.,University of Kiel | Aceves-Mijares M.,National Institute of Astrophysics, Optics and Electronics | Yu Z.,Tianjin Lishen Battery Joint Stock Co Ltd. | And 2 more authors.
Thin Solid Films | Year: 2011

The photoluminescence emission of multilayer structures composed of layers of silicon rich oxide with high silicon content and layers of silicon rich oxide with low silicon content obtained by low pressure chemical vapor deposition is here presented. Different parameters for the preparation of the multilayers have been varied such as the Si concentration and the thicknesses of the layers. Additionally, the samples were oxidized at different temperatures. For all samples the photoluminescence seems to have the same origin: defects in the oxide matrix and defects at the interfaces between the Si nanocrystals. The structural and compositional properties of the multilayer structures are discussed. © 2011 Elsevier B.V. All rights reseved.

Huang M.,Tianjin Lishen Battery Joint Stock Co. | Kong L.-L.,Tianjin Lishen Battery Joint Stock Co. | Gao Y.-T.,Tianjin Lishen Battery Joint Stock Co.
ECS Transactions | Year: 2016

Thermal property is one of the key considerations for lithium ion battery design and usage in many applications. In order to evaluate the thermal performance of commercial lithium ion battery, thermal shock and high temperature storage tests were performed with the pouch type cells. The resistance was measured with electrochemical impedance spectroscopy (EIS) both before and after the tests. It is revealed that RSEI decreased after thermal shock, but increased after high temperature storage. Meanwhile, Rct increased after both tests but with quite different amplification dependent on the test method. The total resistance also increased after the tests, however, the Rt increase was highly dependent on the cell processing technique and test voltage. This work is expected to provide some detailed data and analysis for the thermal performance evaluation, which could help to further understand the degradation mechanism of lithium ion battery under service conditions. © The Electrochemical Society.

Jin H.-F.,Tianjin Lishen Battery Joint Stock Co. | Gao J.-K.,Tianjin Lishen Battery Joint Stock Co.
30th International Battery Seminar and Exhibit 2013: Primary and Secondary Batteries - Other Technologies | Year: 2013

• As the demand for the battery with higher voltage & higher specific capacity increases gradually, Li-rich cathode material is paid more attentions; • Compared with LCO, Li-rich has high energy density and low cost; • Some issues, such as gas revolution; lower rate capability and cycle stability are needed to be solved; • Further structural analysis is required to improve material performance.

Tianjin Lishen Battery Joint Stock Co. | Date: 2015-09-15

Batteries, electric, for vehicles; battery boxes; plates for batteries; high tension batteries; battery chargers; galvanic cells; batteries, electric; solar batteries; carbon nano tubes, namely, tubular carbon molecules used in extremely small scale electronic and mechanical applications.

Zhou J.,Tianjin LishenBattery Joint stock Co.
33rd Annual International Battery Seminar and Exhibit: Advanced Battery Technologies for Consumer, Automotive and Military Applications | Year: 2016

Lishen has clear targets and product roadmaps for CE and xEV batteries. Lishen has showed progresses in both CE and xEV batteries and technologies.Lishen is becoming a reputational global mobile energy solution provider.

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