Functional Electrolyte: Additives for Improving the Cyclability of Cathode Materials

Abe, Kôji; Takaya, Tsukasa; Yoshitake, Hideya; Ushigoe, Yoshihiro; Yoshio, Masaki; Wang, Hongyu

doi:10.1149/1.1809557

Cited by 48 publications

(30 citation statements)

References 11 publications

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“…Abe et al found that, by decreasing the concentration of such polyphenyl compounds to 0.1−0.2%, the formed polymeric film on LiCoO 2 and spinel Li 1.09 Mn 1.91 O 4 cathodes enable higher cycling stability. 254 Extending the concept to a series of aromatic and heterocyclic compounds, representatives of which are listed in Table 23, Abe et al proposed a mechanism that differs from the protection interphase on anodes. 255 Named electro-conducting membrane (ECM), they claimed that those compounds were selected because of their higher HOMO energy levels (hence lower oxidation potentials) than carbonate solvents, and the passivation film thus formed still allows electron conduction due to the conjugated structure of the polymer species.…”

Section: Additivesmentioning

confidence: 99%

Electrolytes and Interphases in Li-Ion Batteries and Beyond

2014

Chem. Rev.

4,220

3,989

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Section: Additivesmentioning

confidence: 99%

Electrolytes and Interphases in Li-Ion Batteries and Beyond

2014

Chem. Rev.

4,220

3,989

View full text Add to dashboard Cite

“…Therefore, boron‐based anion receptors are normally added as additives to improve both the rate capability and cyclic stability of LIBs. As a typical additive for overcharge protection, a small amount of cyclohexylbenzene (CHB; e.g., 0.1–0.2 wt %) tends to generate a thin electron‐conducting protective membrane on the cathode surface . Systematic studies on the influence of multicomponent functional additives in electrolytes are of great importance and are urgently needed .…”

Section: Introductionmentioning

confidence: 99%

“…[32] However, it is generally accepted that functional electrolyte additives are of considerable importance in modifying and stabilizing the solid-electrolyte interface( SEI) layer, which determines the cycle life and safety of LIBs significantly. [8][9][10][33][34][35][36][37][38][39] Hence, the second strategy is the development of new electrolytesf or LCO-based cells using functional additives,s uch as phenyl-containing compounds (e.g.,b enzenes, [40][41][42][43] anilines, [43,44] phenyl-containing ether or thioethers [41,43,45] ), heterocyclic compounds (e.g.,t hiophenes, [41-43, 46, 47] furans, [41,43] pyrroles, [41] bismaleimide monomers, [48,49] sulfonates, [50] cyclic carbonates [14] ), phosphazenes, [51] boron-based anion receptors, [52] aliphatic dinitriles, [53] and inorganic materials (e.g.,A l 2 O 3 ,L i 2 CO 3 ). [54,55] Actually,m ost of these functionala dditives are effective to protectt he LCO cathode by participating in the modification of the SEI layer (sometimes forming ac onductivep olymeric film) to stabilize the electrode-electrolyte interfacee fficiently by suppressing undesired parasitic reactions.…”

Section: Introductionmentioning

confidence: 99%

Three‐Component Functional Additive in a LiPF₆‐Based Carbonate Electrolyte for a High‐Voltage LiCoO₂/Graphite Battery System

Pang

et al. 2017

Energy Tech

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The effectiveness of multicomponent functional additives on the performances of lithium ion batteries has received increasing attention. Tris(2H‐hexafluoroisopropyl) borate (THFPB) additive can totally suppress the appearance of a crystallized complex between LiPF6 and adiponitrile (ADN). Herein, ADN, THFPB, and cyclohexylbenzene are demonstrated to be an effective three‐component functional additive in LiPF6‐based carbonate electrolyte that improves the cyclability and rate capabilities of LiCoO2/graphite full cells charged to 4.4, 4.45, and 4.5 V, respectively. By systematic characterization, it is demonstrated rationally that, with the help of the three‐component functional additive, the electrolyte is stabilized and new types of less resistant, thinner, more protective solid–electrolyte interfaces are constructed simultaneously on the surfaces of both electrodes.

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“…Furthermore, we have recently reported a positive electrode surface-modifying agent for protection against electrolyte decomposition on positive electrodes. 26,27 The additive for positive electrodes, known as a monomer of a conducting polymer, is deliberately decomposed on the active site of the positive electrode surface to produce an electroconducting membrane ͑ECM͒, which controls the decomposition of the electrolyte. 28 As described above, the electrolyte-containing additives, which improve the specific performance of the batteries, have been the key to electrolyte research in recent years and is now widely called functional electrolytes.…”

mentioning

confidence: 99%

Functional Electrolytes

Abe

Hattori

Kawabe

et al. 2007

J. Electrochem. Soc.

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We have found that certain triple-bonded compounds show a very interesting behavior in Li-ion batteries. These novel types of additives have proven to improve battery performance, especially in cycleability. Propargyl methanesulfonate and propargyl methyl carbonate show good performance among several triple-bonded compounds. These triple-bonded compounds are investigated in contradistinction with previously known double-bonded compounds ͑allyl methanesulfonate and allyl methyl carbonate͒. We used molecular orbital calculations for the selection of the additives and have proved that the calculated lowest unoccupied molecular orbital and highest occupied molecular orbital values agree well with the measured reduction and oxidation potentials, respectively. To clarify the performance of the triple-bonded compounds, electrochemical properties and cycleability were investigated. The triple-bonded compounds were found to be deliberately decomposed on the negative electrode to produce a dense solid electrolyte interphase ͑SEI͒, showing an excellent improvement of cycleability. The nature and the component of the derived SEI were studied by X-ray photoelectron spectroscopy and Auger electron spectroscopy. It was concluded that these triple-bonded compounds contribute to the improved cycleability, because the SEI derived from the triple-bonded compounds has a thinner and denser morphology than previously known additives.Since 1991, when the lithium-ion battery ͑LIB͒ appeared on the market, the use of small-sized electronic devices such as portable phones and notebook PCs has quickly expanded. Presently, the use of the LIB is spreading to power tools such as the hybrid electric vehicle ͑HEV͒. The energy density of the LIB has improved three times in capacity to that in 1991. However, a capacity increase is still required for future uses. It is obvious that the capacity increase of the LIB is due not only to the improvement of the battery manufacturing technology and the electrode material, but also to the development of its electrolyte technology.As an electrolyte development technology, old examples such as the addition of CO 2 , 1-3 SO 2 , 4,5 N 2 O, 6 and 12-crown-4 ether 7,8 are known. In contrast to the conventional technology, in 1999 we proposed the concept of "functional electrolytes," based on highly purified electrolyte to which only a slight amount of electrolyte additives is introduced. 9,10 Due to the high purity of the electrolyte, electrolyte decomposition itself is inhibited. Consequently, a slight amount of electrolyte additives is deliberately decomposed on the negative electrode surface to produce the solid electrolyte interphase ͑SEI͒, which improves the battery performance. We commercialized the functional electrolytes in 1997, and several kinds of additives for negative electrode surface modification have been reported such as cathecohol carbonate, 11,12 imide compounds, 13 and double-bonded compounds like vinyl acetate. 14-20 Since the emergence of functional electrolytes, it would not be an exaggera...

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Functional Electrolyte: Additives for Improving the Cyclability of Cathode Materials

Cited by 48 publications

References 11 publications

Electrolytes and Interphases in Li-Ion Batteries and Beyond

Electrolytes and Interphases in Li-Ion Batteries and Beyond

Three‐Component Functional Additive in a LiPF₆‐Based Carbonate Electrolyte for a High‐Voltage LiCoO₂/Graphite Battery System

Functional Electrolytes

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Functional Electrolyte: Additives for Improving the Cyclability of Cathode Materials

Cited by 48 publications

References 11 publications

Electrolytes and Interphases in Li-Ion Batteries and Beyond

Electrolytes and Interphases in Li-Ion Batteries and Beyond

Three‐Component Functional Additive in a LiPF6‐Based Carbonate Electrolyte for a High‐Voltage LiCoO2/Graphite Battery System

Functional Electrolytes

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Three‐Component Functional Additive in a LiPF₆‐Based Carbonate Electrolyte for a High‐Voltage LiCoO₂/Graphite Battery System