A Novel Scheme to Improve the Stability of Conventional‐Concentration Electrolyte at High Voltage

Zhang, Jingjing; Wang, Jie; Wu, Shumin; Wang, Peng; Sun, Jing; Zhao, Dongni; Zhang, Lijuan; Mao, Liping; Niu, Lei; Cui, Xiaoling

doi:10.1002/batt.202200329

Cited by 3 publications

(4 citation statements)

References 45 publications

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“…Besides, the phosphates derived by LiDFP provide low interfacial impedance and strengthen the reaction kinetics of the electrode. 32,33 Based on the unique properties of the above-mentioned additives, this study combines VC and LiDFP as hybrid functional additives to improve the performances of Si@Cbased LIBs. On one hand, the classical film-forming additive of VC helps to build a flexible SEI which effectively improve the toleration of the expansion and the rupture of the Si-based anode material.…”

Section: ■ Introductionmentioning

confidence: 99%

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Building a Flexible and Highly Ionic Conductive Solid Electrolyte Interphase on the Surface of Si@C Anodes by Binary Electrolyte Additives

Song,

Li,

Wang

et al. 2023

ACS Appl. Mater. Interfaces

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Si@C as a high specific capacity anode material for lithium batteries (LIBs) has attracted a lot of attention. However, the severe volume change during lithium de-embedding causes repeated rupture/reconstruction of the solid electrolyte interphase (SEI), resulting in poor cycling stability of the Si-based battery system and thus hindering its application in commercial batteries. Using electrolyte additives to form an excellent SEI is considered to be a cost-effective method to meet this challenge. Here, the classical film-forming additive vinyl carbonate (VC), and the newly emerging lithium salt additive lithium difluorophosphate (LiDFP), are chosen as synergistic additives to improve the electrode–electrolyte interface properties. Final results show that the VC additive generates flexible polycarbonate components at the electrode/electrolyte interface, preventing the fragmentation of Si particles. However, the organic components show high impedance, inhibiting the fast transport of Li+. This defect can be supplemented from the decomposition substances of the LiDFP additive. The derived inorganic products, such as LiF and Li3PO4, can strengthen the reaction kinetics of the electrode, reduce the interfacial impedance, and promote the Li+ transport. Thus, the synergistic effect of VC and LiDFP additives builds an effective SEI with good flexibility and high ionic conductivity and then significantly improves the cycling and rate stability of Si@C anodes. The experimental results show that the utilization of LiDFP and VC additives to modify the Si@C anode interface enhances the capacity retention of the Si@C/Li half-cell after 100 cycles from 68.2% to 85.1%. Besides, the possible mechanism of action between VC and LiDFP is proposed by using the spectral characterization technique and density functional theory (DFT) calculations. This research opens up a new possibility for improvement of SEI, and provides a simple way to achieve high-performance Si-based LIBs.

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Section: ■ Introductionmentioning

confidence: 99%

“…As a lithium salt additive, LiDFP can not only effectively inhibit the side reaction between electrode interface and electrolyte but also suppress the generation of lithium dendrites. Besides, the phosphates derived by LiDFP provide low interfacial impedance and strengthen the reaction kinetics of the electrode. , …”

Section: Introductionmentioning

confidence: 99%

Building a Flexible and Highly Ionic Conductive Solid Electrolyte Interphase on the Surface of Si@C Anodes by Binary Electrolyte Additives

Song,

Li,

Wang

et al. 2023

ACS Appl. Mater. Interfaces

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“…In order to solve the problem of poor cycling performance of LNMO, both material modifications and electrolyte additives are effective methods [4,5] . Among them, developing suitable electrolyte additives to reduce internal side-reactions and stabilize the LNMO/electrolyte interface is a low-cost and simple method.…”

Section: Introductionmentioning

confidence: 99%

Diethyl (4-isopropylbenzyl) phosphonate as an electrolyte additive for LiNi0.5Mn1.5O4 cathode for high-voltage Li-ion battery

Wei,

Li,

Zhang

et al. 2024

Ninth International Conference on Energy Materials and Electrical Engineering (ICEMEE 2023)

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Diethyl (4-isopropylbenzyl)phosphonate (DLPP) was applied as a positive film forming additive for LiNi 0.5 Mn 1.5 O 4 (LNMO) cathode. The rate and cycling performances of LNMO have been improved by adding 1 wt.% DLPP in carbonate electrolyte. The DFT calculation and LSV test shows that DLPP can preferentially oxidize decomposition during charging process, which inhibits the continuous electrolyte decomposition and promotes the formation of a protective cathode layer. LNMO/Li half-cell using the electrolyte with 1 wt.% DLPP delivers better rate capabilities and capacity retention of 92.8% after 200 cycles at 3 C (86.8% with STD electrolyte). SEM and XRD tests of the electrode after cycling show that DLPP can significantly stabilize the LNMO/electrolyte interface and crystal structures.

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“…However, the potential of Ni 2+ /Ni 4+ in LNMO is higher than the decomposition voltage (4.3 V) of industrial electrolyte. During charging and discharging process, the electrode material may occur side reactions with the electrolyte, thus forming a thick cathode electrolyte interface (CEI) film, impeding the Li + transmission, increasing the battery impedance, thus leading to a sharp decline in cycling performance [3][4]. So, it is urgently to develop an electrolyte system to solve the interface problem between electrode materials and electrolytes.…”

Section: Introductionmentioning

confidence: 99%

Study on the (trimethoxysilyl) naphthalene electrolyte additive for enhancing electrochemical performance of LiNi0.5Mn1.5O4 cathode for Li-ion battery

Wei,

Mu,

et al. 2024

Ninth International Conference on Energy Materials and Electrical Engineering (ICEMEE 2023)

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The electrochemical performances of LiNi 0.5 Mn 1.5 O 4 (LNMO) have been improved by adding 0.5 wt.% (Trimethoxysilyl)naphthalene (TMSN) in carbonate electrolyte. The linear sweep voltammetry (LSV) test shows TMSN could preferentially undergo oxidative decomposition during charging process, which further inhibits the electrolyte decomposition. LNMO/Li half-cell presents better rate capabilities and an increased capacity retention of 89.3% after 200 cycles at 1 C by adding 0.5wt. % TMSN, indicating that TMSN can significantly reduce the HF content in the electrolytes and form a stable electrolyte/electrode interfacial on LNMO's surface.

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A Novel Scheme to Improve the Stability of Conventional‐Concentration Electrolyte at High Voltage

Cited by 3 publications

References 45 publications

Building a Flexible and Highly Ionic Conductive Solid Electrolyte Interphase on the Surface of Si@C Anodes by Binary Electrolyte Additives

Building a Flexible and Highly Ionic Conductive Solid Electrolyte Interphase on the Surface of Si@C Anodes by Binary Electrolyte Additives

Diethyl (4-isopropylbenzyl) phosphonate as an electrolyte additive for LiNi0.5Mn1.5O4 cathode for high-voltage Li-ion battery

Study on the (trimethoxysilyl) naphthalene electrolyte additive for enhancing electrochemical performance of LiNi0.5Mn1.5O4 cathode for Li-ion battery

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