Electrochemical Comparison of Chemically or Physically Modified Natural Graphite Anode for Lithium-Ion Batteries

2007 ◽  
Vol 124-126 ◽  
pp. 995-998
Author(s):  
Joong Pyo Shim ◽  
Hong Ki Lee ◽  
Byung Ho Song
Keyword(s):  
Heat Treatment ◽  
Carbon Black ◽  
Lithium Ion ◽  
Graphite Powder ◽  
Capacity Fade ◽  
Irreversible Capacity ◽  
Natural Graphite ◽  
Capacity Loss ◽  
Graphite Anodes ◽  
Powder Addition

Natural graphite anodes were treated by different methods to improve their cyclability. We tried following methods; heat-treatment at 550oC for graphite powder, addition of carbon black for electrode and VC (vinylene carbonate) in electrolyte. All methods decreased capacity fade rate during constant cycling. The addition of carbon black decreased capacity fade significantly but increased irreversible capacity much at first cycle. Heat-treatment and VC were also effective for cycling and irreversible capacity loss.

scholarly journals Capacity Fade in Lithium-Ion Batteries and Cyclic Aging over Various State-of-Charge Ranges

2019 ◽  
Vol 11 (23) ◽  
pp. 6697 ◽  
Author(s):  
Sophia Gantenbein ◽  
Michael Schönleber ◽  
Michael Weiss ◽  
Ellen Ivers-Tiffée
Keyword(s):  
Particle Surface ◽  
High Capacity ◽  
Lithium Ion ◽  
Open Circuit ◽  
Operating Conditions ◽  
State Of Charge ◽  
Capacity Fade ◽  
Active Electrode ◽  
Capacity Loss ◽  
Aging Mechanisms

In order to develop long-lifespan batteries, it is of utmost importance to identify the relevant aging mechanisms and their relation to operating conditions. The capacity loss in a lithium-ion battery originates from (i) a loss of active electrode material and (ii) a loss of active lithium. The focus of this work is the capacity loss caused by lithium loss, which is irreversibly bound to the solid electrolyte interface (SEI) on the graphite surface. During operation, the particle surface suffers from dilation, which causes the SEI to break and then be rebuilt, continuously. The surface dilation is expected to correspond with the well-known graphite staging mechanism. Therefore, a high-power 2.6 Ah graphite/LiNiCoAlO2 cell (Sony US18650VTC5) is cycled at different, well-defined state-of-charge (SOC) ranges, covering the different graphite stages. An open circuit voltage model is applied to quantify the loss mechanisms (i) and (ii). The results show that the lithium loss is the dominant cause of capacity fade under the applied conditions. They experimentally prove the important influence of the graphite stages on the lifetime of a battery. Cycling the cell at SOCs slightly above graphite Stage II results in a high active lithium loss and hence in a high capacity fade.

Enhancing the rate performance of graphite anodes through addition of natural graphite/carbon nanofibers in lithium-ion batteries

2013 ◽  
Vol 93 ◽  
pp. 236-240 ◽  
Author(s):  
Tae-Hwan Park ◽  
Jae-Seong Yeo ◽  
Min-Hyun Seo ◽  
Jin Miyawaki ◽  
Isao Mochida ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Carbon Nanofibers ◽  
Lithium Ion ◽  
Rate Performance ◽  
Natural Graphite ◽  
Graphite Anodes

Irreversible capacity and rate-capability properties of lithium-ion negative electrode based on natural graphite

2017 ◽  
Vol 14 ◽  
pp. 383-390 ◽  
Author(s):  
Jiří Libich ◽  
Josef Máca ◽  
Jiří Vondrák ◽  
Ondřej Čech ◽  
Marie Sedlaříková
Keyword(s):  
Rate Capability ◽  
Negative Electrode ◽  
Lithium Ion ◽  
Irreversible Capacity ◽  
Natural Graphite

Reactivity of Carbonaceous Anodes Used in Lithium-ion Batteries, Part I: Correlation of Structural Parameters and Reactivity

1998 ◽  
Vol 548 ◽  
Author(s):  
G. A. Nazri ◽  
B. Yebka ◽  
M. Nazri ◽  
D. Curtis ◽  
K. Kinoshita ◽  
...  
Keyword(s):  
Safety Concern ◽  
Structural Parameters ◽  
Rate Capability ◽  
Lithium Ion ◽  
High Energy ◽  
High Rate ◽  
Irreversible Capacity ◽  
Capacity Loss ◽  
Initial Charge ◽  
Charge Discharge

ABSTRACTCarbonaceous anodes are the most practical elecrode for application in lithium-ion battery, mainly due to their low cost, flexibility for modification to achieve high energy capacity and high rate capability, abundance and environmentally uniquencess. Despite superior advantages of carbonaceous anodes vs other alternative anode and metallic lithium, there is considerable reactivity of lithiated graphite with organic electrolytes, which is a major safety concern. In this work, we report the nature of gaceous species generated on various carbonaceous anodes during initial charge-discharge cycling. The correlation between structural parameters of carbonaceous materials and their irreversible capacity loss have been investigated. Structural parameters have been studied using x-ray diffraction, Raman spectroscopy, and scanning and transmission electron microscopy. We have found a direct correlation between crystal morphology, degree of disorder, degree of graphitisation and the irreversible capacity loss. There is also a direct correlation between the irrversible capacity loss and the volume of gas generated during initial charge- disharge cycling. Results also show the importance of removing adsorbed and trapped gases in addition to removal of bonded impurities, such as functional groups from carbonaceous electrode before fabrication of batteries.Particular attention is given on thermal analysis for different graphite compounds and the influence of different parameters and conditions: nature of graphite in term of specific surface area, degree of graphitization and the length of microcristallites, degree of intercalation, nature of electrolytes on irreversible capacity loss and volume of gases generated during the initial charge-discharge cycles.

scholarly journals EIS Study on the Electrode-Separator Interface Lamination

Batteries ◽  
2019 ◽  
Vol 5 (4) ◽  
pp. 71 ◽  
Author(s):  
Martin Frankenberger ◽  
Madhav Singh ◽  
Alexander Dinter ◽  
Karl-Heinz Pettinger
Keyword(s):  
Solid Electrolyte ◽  
Lithium Ion Batteries ◽  
Surface Resistance ◽  
Lithium Ion ◽  
Capacity Fade ◽  
Aging Effects ◽  
Fast Charging ◽  
Initial Decrease ◽  
Graphite Anodes ◽  
Comprehensive Study

This paper presents a comprehensive study of the influences of lamination at both electrode-separator interfaces of lithium-ion batteries consisting of LiNi1/3Mn1/3Co1/3O2 cathodes and graphite anodes. Typically, electrode-separator lamination shows a reduced capacity fade at fast-charging cycles. To study this behavior in detail, the anode and cathode were laminated separately to the separator and compared to the fully laminated and non-laminated state in single-cell format. The impedance of the cells was measured at different states of charge and during the cycling test up to 1500 fast-charging cycles. Lamination on the cathode interface clearly shows an initial decrease in the surface resistance with no correlation to aging effects along cycling, while lamination on both electrode-separator interfaces reduces the growth of the surface resistance along cycling. Lamination only on the anode-separator interface shows up to be sufficient to maintain the enhanced fast-charging capability for 1500 cycles, what we prove to arise from a significant reduction in growth of the solid electrolyte interface.

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