Effects of anode active materials to the storage-capacity fading on commercial lithium-ion batteries

Kwak, Gun-Ho; Park, Jounghwan; Lee, Jinuk; Kim, Sinja; Jung, In‐Ho

doi:10.1016/j.jpowsour.2007.06.169

Cited by 32 publications

(11 citation statements)

References 17 publications

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“…The sample with triphenylphosphine (TPP) shows no significant morphological changes from SEM. XRD analysis confirms that artificial graphites have larger lattice constants in the c -axis direction than natural graphite samples ( Figure 2 b), similar to those reported in other studies [ 37 , 38 , 39 ]. The TPP treated sample shows a slight increase in the lattice constant, probably due to phosphorus [ 22 ].…”

Section: Resultssupporting

confidence: 89%

Identifying the Association between Surface Heterogeneity and Electrochemical Properties in Graphite

et al. 2021

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Graphite materials for commercial Li-ion batteries usually undergo special treatment to control specific parameters such as particle size, shape, and surface area to have desirable electrochemical properties. Graphite surfaces can be classified into basal and edge planes in the aspect of the structure of carbons, with the existing defect sites such as functional groups and dislocations. The solid-electrolyte interphase (SEI) mostly forms at the edge plane and defect sites, as Li-ions only intercalate through these non-basal planes, whereas the electrochemical properties of graphite largely depend on its surface heterogeneity due to the difference of reactivity on each plane. In order to quantify the detailed surface structure of graphite materials, local-absorption isotherms were utilized, and the analyzed nanostructural parameters of various commercial graphite samples were correlated with the electrochemical properties of each graphite anode. Thereby, we have confirmed that the fraction of non-basal plane and fast-charging capability has strong linear relations. The pore/non-basal sites are also related to the cycle life by affecting the SEI formation, and the determination of surface heterogeneity and pores of graphite materials can provide powerful parameters that imply the electrochemical performances of commercial graphite.

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Section: Resultssupporting

confidence: 89%

Identifying the Association between Surface Heterogeneity and Electrochemical Properties in Graphite

et al. 2021

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“…With the development of electric vehicles, high energy density, high safety, and low-cost lithium-ion batteries (LIBs) are in ever-increasing demand. Ni-rich LiNi x Co y Mn z O 2 ( x + y + z = 1, NCM), such as, LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) and LiNi 0.6 Co 0.2 Mn 0.2 O 2 (NCM622) are promising materials for the practical use of high-energy density LIBs. − Nevertheless, the wide application of these Ni-rich NCM-based LIBs with the graphite electrode as the anode is restricted by the irreversible capacity and short cycle life, which strongly depends on the quality of solid electrolyte interphase (SEI) at the anode surface. − Particularly, the SEI layer is a conductive layer for Li + but not for electrons, which is formed by the reductive decomposition of the organic electrolytes during the initial charge process and worked as a passivation layer for the graphite electrode on subsequent cycling . Based on this special property, a general strategy for the anode surface is by constructing an intact and firm SEI layer, which can effectively prevent the electrolyte decomposition, thereby resulting in an excellent electrochemical performance for LIBs.…”

Section: Introductionmentioning

confidence: 99%

The Electrolyte Additive Effects on Commercialized Ni-Rich LiNi_xCo_yMnzO₂ (x + y + z = 1) Based Lithium-Ion Pouch Batteries at High Temperature

Wang

Hao

et al. 2021

ACS Appl. Energy Mater.

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The commercialized lithium-ion pouch cells with an Ni-rich cathode material feature high energy density and are favored in the automotive market; however, they still suffer from rapid capacity loss and poor cyclability due to the unstable solid electrolyte interphase (SEI) at the anode surface under a high temperature. Here, an effective electrolyte additive of tripropargyl phosphate (TPP) is studied to improve the high-temperature performance of the Ni-rich cathode-based pouch cells. Resulting from the electrochemical reductions of TPP, a TPP-originated and phosphorus-rich SEI layer formed on the surface of a graphite anode, which directly avoids the graphite plates from being exposed in the electrolyte and suppresses the repeated consumption of cyclable Li+. After the storage for 15 days under 60 °C, an initial discharge capacity of 147.9 mAh g–1 can be achieved for the LiNi0.6Co0.2Mn0.2O2/graphite cell containing 1.0 wt % TPP, much higher than the value (132.2 mAh g–1) of the TPP-free cell. Meanwhile, the cycling performance at a high temperature for the LiNi0.8Co0.1Mn0.1O2/graphite cell is also significantly improved by introducing 1.0 wt % TPP into the electrolyte. Such an outstanding electrochemical performance and the solid evidences strongly confirmed that the stabilized anode surface film induced by the TPP addition plays a crucial role in enhancing the performance of commercialized cells.

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“…Thus, elucidating the reactions of LIBs is important in order to enhance their performance, make them safer and bring cost benefit.The LIBs are chemical cells employing various elementary reactions which are governed by the bulk properties of the chemical components and their interface (2). The state at interface and in particles should be simultaneously investigated during cell operation for they dynamically change; e.g., OCV (Open Circuit Voltage) of the cell varied with the operation and storage at the same SOC (State of Charge), and the OCV relaxes after pulse charge-discharge operations (3,4).…”

Section: Introductionmentioning

confidence: 99%

In Situ Solid State ⁷Li NMR Observation of Lithium Metal Deposition during Overcharge in Lithium Ion Battery

et al. 2014

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Lithium metal deposition during overcharge in a full cell composed of lithium metal oxide (LiCoO 2 ) positive electrodes and carbon negative electrodes (a synthesized graphite, a natural graphite and two types of hard carbon) was observed by in situ 7 Li solid state NMR (nuclear magnetic resonance). Peak intensities corresponding to the GIC (Graphite Intercalation Compound, charged state) and dendritic Li (deposited metallic Li) were monitored at each 20% state of charge (SOC) during discharge (and charge) and each 17 minutes (or 1000 scans) after the cell capacity reached the expected overcharge. The GIC peak increased with charge and decreased with discharge during the normal voltage of operation. The Li metal deposition occurred after the cell was charged above its normal operational voltage (4.2 V) though intercalation into the carbon still simultaneously occured, suggesting that metallic Li can be formed when the negative electrode reaches a voltage below 0 V vs. Li. We also found that the dendritic Li is not inert but active to be oxidized again and intercalated into the carbon within a few hours. The dendritic Li formed on hard carbon was completely discharged, while that deposited on graphite was not, indicating that the electrochemical property of the dendritic Li varies with the nature of the negative electrode. ECS Transactions, 62 (1) 159-187 (2014) 159 ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 169.230.243.252 Downloaded on 2014-12-14 to IP

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Effects of anode active materials to the storage-capacity fading on commercial lithium-ion batteries

Cited by 32 publications

References 17 publications

Identifying the Association between Surface Heterogeneity and Electrochemical Properties in Graphite

Identifying the Association between Surface Heterogeneity and Electrochemical Properties in Graphite

The Electrolyte Additive Effects on Commercialized Ni-Rich LiNi_xCo_yMnzO₂ (x + y + z = 1) Based Lithium-Ion Pouch Batteries at High Temperature

In Situ Solid State ⁷Li NMR Observation of Lithium Metal Deposition during Overcharge in Lithium Ion Battery

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Effects of anode active materials to the storage-capacity fading on commercial lithium-ion batteries

Cited by 32 publications

References 17 publications

Identifying the Association between Surface Heterogeneity and Electrochemical Properties in Graphite

Identifying the Association between Surface Heterogeneity and Electrochemical Properties in Graphite

The Electrolyte Additive Effects on Commercialized Ni-Rich LiNixCoyMnzO2 (x + y + z = 1) Based Lithium-Ion Pouch Batteries at High Temperature

In Situ Solid State 7Li NMR Observation of Lithium Metal Deposition during Overcharge in Lithium Ion Battery

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The Electrolyte Additive Effects on Commercialized Ni-Rich LiNi_xCo_yMnzO₂ (x + y + z = 1) Based Lithium-Ion Pouch Batteries at High Temperature

In Situ Solid State ⁷Li NMR Observation of Lithium Metal Deposition during Overcharge in Lithium Ion Battery