Insight into the interaction between layered lithium-rich oxide and additive-containing electrolyte

Tu, Wenqiang; Pan, Xuran; Zheng, Xiongwen; Ye, Changchun; Xu, Mengqiang; Li, Weishan

doi:10.1016/j.jpowsour.2016.12.012

Cited by 76 publications

(51 citation statements)

References 78 publications

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“…In addition, the formation of LiF in the cathode/electrolyte interface demonstrates a decrease from E‐control‐3 to NFE‐1 and to NFE‐2. The presence of highly resistive LiF on the cathode surface is unfavorable for Li + transport kinetics which may lead to capacity fading …”

Section: Resultsmentioning

confidence: 99%

High‐Performance Silicon Anodes Enabled By Nonflammable Localized High‐Concentration Electrolytes

Jia

Zou

Gao

et al. 2019

Advanced Energy Materials

206

139

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electric vehicles. [1] LIBs with the conventional carbonaceous anode materials such as graphite have played a dominant role in the current market of customer electronics and electrical transportation. However, low capacity of carbonaceous anode materials (372 mAh g −1 ) also limits the further increase in energy densities of LIBs. [2] In this regard, silicon (Si)-based anode is considered as one of the most promising anode candidates in further boosting the specific energy of LIBs because Si has one of the highest practical capacity of 3579 mAh g −1 among various anode materials and a relatively low lithiation potential of 0.2 V versus Li/Li + . However, fast capacity fade and large swelling of Si anodes related to their large volume expansion (>300%) upon lithiation greatly hindered their deployment in practical applications. [3] There has been significant progress toward understanding and mitigating the capacity fade in Si-based anodes, including exploiting nanostructured Si materials, [4] porous structures, [5] surface coatings, [6] core-shell structures, [7] and novel binders. [8] However, the development of novel electrolytes for Si-based anodes is relatively slow because most researches have been focused on the structure development of Si electrodes. The conventional electrolytes for Si anodes are LiPF 6 /carbonate-based electrolytes with a certain amount of fluoroethylene carbonate (FEC) as an additive or cosolvent (from 5% to 10% by weight in the electrolytes). [9] Linear carbonate solvents usually have relatively low flashpoints, so they are easily ignited and may lead to safety problems under certain extreme conditions. [10] In addition, the formed solid electrolyte interphase (SEI) on anode surface in conventional carbonate electrolytes is unstable and cannot withstand the large volume changes of Si during cycling. Although the introduction of FEC in the conventional LiPF 6 / carbonate electrolytes can improve the cycling performance of Si anodes, increased amount of FEC may lead to increased gassing in full cells. Because such high content of FEC in the electrolytes may form a detrimental cathode electrolyte interface (CEI) on cathode surface and generate a serious gassing issue especially at high charge cutoff voltages and elevated temperatures, which lead to impedance increase, capacity fading and safety issue of the Si-based full cells. Therefore, the Silicon anodes are regarded as one of the most promising alternatives to graphite for high energy-density lithium-ion batteries (LIBs), but their practical applications have been hindered by high volume change, limited cycle life, and safety concerns. In this work, nonflammable localized highconcentration electrolytes (LHCEs) are developed for Si-based anodes. The LHCEs enable the Si anodes with significantly enhanced electrochemical performances comparing to conventional carbonate electrolytes with a high content of fluoroethylene carbonate (FEC). The LHCE with only 1.2 wt% FEC can further improve the long-term cycling stability of Si-base...

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Section: Resultsmentioning

confidence: 99%

High‐Performance Silicon Anodes Enabled By Nonflammable Localized High‐Concentration Electrolytes

Jia

Zou

Gao

et al. 2019

Advanced Energy Materials

206

139

View full text Add to dashboard Cite

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“…This SEI lm effectively passivates the highly charged electrode surface, and therefore suppresses the direct electronic contact of the carbonate-based electrolyte with the electrode. The investigated lm-forming electrolyte additives mainly include nitriles (such as 1,3,6-hexanetricarbonitrile and glycol bis(propionitrile) ether), 38,39 phosphites (such as trimethyl phosphite, triethyl phosphite, triphenyl phosphite and tris(2,2,2-triuoroethyl) phosphite) [40][41][42][43] and silicohydrides (such as (trimethylsilyl)methanesulfonate and tris(trimethylsilyl) borate), 44,45 which improve the cycling stability of LLOs to various extents. Furthermore, our previous work demonstrated that boracic electrolyte additives, such as trimethyl borate (TMB) and triethyl borate (TEB), show great capability to enhance the cycling stability of LLOs.…”

Section: Introductionmentioning

confidence: 99%

Insight into the capacity fading of layered lithium-rich oxides and its suppression via a film-forming electrolyte additive

Xing

Wang

et al. 2018

RSC Adv.

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“…As shown in Fig. 11d, Li et al [207] reported triethyl phosphide (TEP) as an electrolyte additive, which could trap the active oxygen released from activation of Li 2 MnO 3 and then could be oxidized on layered Li-rich oxide (LRO) to form a cathode film. Shim et al [208] introduced diphenyloctyl phosphate (DPOP) with two benzene rings to electrolyte and obtained high-capacity retention rates and discharge capacity in the LiCoO 2 /MCMB system [209,210].…”

Section: Flame-retardant Additivesmentioning

confidence: 99%

Building Safe Lithium-Ion Batteries for Electric Vehicles: A Review

Duan

Tang

Dai

et al. 2019

Electrochem. Energ. Rev.

594

260

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Lithium-ion batteries (LIBs), with relatively high energy density and power density, have been considered as a vital energy source in our daily life, especially in electric vehicles. However, energy density and safety related to thermal runaways are the main concerns for their further applications. In order to deeply understand the development of high energy density and safe LIBs, we comprehensively review the safety features of LIBs and the failure mechanisms of cathodes, anodes, separators and electrolyte. The corresponding solutions for designing safer components are systematically proposed. Additionally, the in situ or operando techniques, such as microscopy and spectrum analysis, the fiber Bragg grating sensor and the gas sensor, are summarized to monitor the internal conditions of LIBs in real time. The main purpose of this review is to provide some general guidelines for the design of safe and high energy density batteries from the views of both material and cell levels.

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Insight into the interaction between layered lithium-rich oxide and additive-containing electrolyte

Cited by 76 publications

References 78 publications

High‐Performance Silicon Anodes Enabled By Nonflammable Localized High‐Concentration Electrolytes

High‐Performance Silicon Anodes Enabled By Nonflammable Localized High‐Concentration Electrolytes

Insight into the capacity fading of layered lithium-rich oxides and its suppression via a film-forming electrolyte additive

Building Safe Lithium-Ion Batteries for Electric Vehicles: A Review

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