Lithium Bis oxalato borate

Lithium bis(oxalato)borate (LiBOB) shows only moderate solubility up to about 1.0 M in some organic solvents (such as blends of PC and EC). Its conductivity is about 8-9 mS cm in appropriate solvents [97] (in DME even 14.9 mS cm at ambient temperature [98]). A major advantage is its thermal stability (up to 300 °C [99]) and the passivation film on aluminum, formed by the first cycle. This passivation film protects the aluminum current collector even at higher potentials than LiPFfi does, without breakdown up to 5.75 V [97, 100]. Furthermore, LiBOB has slightly better cycHng stability at ambient temperature, which is considerably increased at temperatures up to 70 °C [97]. Another advantage is that LiBOB forms 

For some recent investigations on conductivity studies of LiBOB c. f Ref [527]. 

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The development of new Li salts to replace the commonly used LiPFg, which is not stable with water and has low thermal stability at elevated temperatures, continues to draw attention. A newly developed Li salt, lithium bis(oxalato) borate shows a number of advantages such as higher thermal stability at elevated temperatures, capability for improving compatibility between the graphite anode and PC-based electrolytes, and lower cost. ... 

Laheaar, A., A. Janes, and E. Lust. 2012. Lithium bis(oxalato)borate as an electrolyte for micromesoporous carbide-derived carbon based supercapacitors. Journal of Electro analytical Chemistry 669 67-72. 

It is well known that the type of lithium salt also affects the composition and quality of the SEI however, the additive effects of lithium salts are not well understood. It was proved that organoboron complexes such as lithium bis(salicylato)borate and lithium bis(oxalato)borate (LiBOB) forms stable SEI on graphite anode, ... 

The first organoborate salt to attract significant interest from the broader battery research community was lithium bis(oxalato)borate (LiBOB) (i.e., LiB(C02C02)2) (Figs. 1.27a and 1.28a) [48,79,376,380,385,390-484]. The first publication with... 

S. Tsujioka, H. Takase, M. Takahashi, H. Sugimoto, Jap. Patent JP 2001302675 A, 2001. Preparation of lithium bis(oxalato)borate as ionic metal complex. 

K. Xu, S. Zhang, B. A. Poese, T. R. Jow, Electrochem. Solid-State Lett. 2002, 5, A259-A262. Lithium bis(oxalato)borate stabilizes graphite emode in propylene carbonate. 

W. Larsson, J.-C. Panitz, A. Cedergren, Talanta 2006, 69, 276-280. Interference-free coulo-metiic titration of water in lithium bis(oxalato)borate using Karl Fischer reagents based on Nmethylformamide. 

N.-S. Choi, K. H. Yew, H. Kim, S.-S. Kim, W.-U. Choi, J. Power Sources 2007,172,404 09. Surface layer formed on silicon thin-film electrode in lithium bis(oxalato) borate-based electrolyte. 

L. Larush-Asraf, M. Bliton, H. Teller, E. Zinigrad, D. Ambach, J. Power Sources 2007, 174, 400-407. On the electrochemical and thermal behavior of lithium bis(oxalato)borate (LiBOB) solutions. 

L.-Z. Fan, T. Xing, R. Awan, W. Qiu, Ionics 2011, 17,491-494. Studies on lithium bis(oxalato) borate/propylene carbonate-based electrolytes for Li-ion batteries. 

U. lischka, U. Wietehnann, M. Wegner, Ger. Patent DE 19829030 Cl, 1999. Lithium bis(oxalato)borate, method for its production tmd application. 

In 1998, Chemetall GmbH found lithium bis(oxalato)borate (170) [158]. 

Xu K, Zhang S, Poese BA, low TR (2002) Lithium bis(oxalato)borate stabilizes graphite anode in propylene carbonate. Electrochem Solid-State Lett 5 A259... 

Choi et al. [118] compared the effect of two different lithium salts on the cycling performance of a 200-nm silicon thin-film electrode. The electrolytes tested were 1.3-M LiPFs in EC/DEC (3 7 by vol) and 0.7-M lithium bis(oxalato) borate (LiBOB) in the same solvent mixture. They found that the LiBOB-based electrolyte markedly improved the discharge capacity retentirm of the lithium-silicon half-cell, over the LiPFs-based electrolyte. The surface layer on the silicon electrode in the LiBOB-based electrolyte was less porous and effectively limited the formation of electro-chemically inactive silicon phases. The capacity fading of the lithium-silicon... 

To overcome the difficulties met with LiPFe, attempts have been made to replace it by another salt without any fluorine in the chemical formula. Lithium bis(oxalato) borate (LiBOB) was initially studied as an alternative salt to improve the high-temperature performance of Li-ion batteries [64], but it also significantly stabilizes SEI during extended cycling [65]. Jiang and Dahn systematically investigated the safety feature of LiBOB with various electrode materials by means of accelerating rate calorimetry (ARC)... 

Lithium bis(oxalato)borate (LiBOB) salt is believed to form a robust SEI on lithi-ated carbon surface, preventing any exothermic process until 170 C as compared to an onset temperature of 80 C with LiPFe-ethylene carbonate (EC)-diethyl carbonate (DEC) [3]. Better SEI formation properties and higher decomposition tan-perature of LiBOB as well as lack of propensity to form trace amounts of HE in the presence of moisture, render LiBOB the safer salt candidate than LiPFe but the hexafluorophosphate is stiU viable due to better solubility in the typical electrolyte solvents and higher conductivity than LiBOB (Chap. 1, Tables 1.8 and 1.9). 

Lithium perchlorate LiC104 Lithium Lithium hexafluoroarsenate tetralluoroborate LiAsFg LiBp4 Lithium fluoroaUcyphosphates LiFAP Lithium bis(oxalato) borate LiBOB... 

Ha S-Y, Han J-G, Song Y-M, Chun M-J, Han S-1, Shin W-C, Choi N-S (2013) Using a lithium bis(oxalato) borate additive to improve electrochemical performance of high-voltage spinel LiNio.5Mn1.5O4 cathodes at 60 °C. Electrochim Acta 104 170-177. doi 10.1016/j. electacta.2013.04.082... 

Kim et al. ARC Cathode and electrolyte The effect of lithium bis(oxalato)borate (FiBOB), vinylene carbonate (VC) and succinonitrile (SN) electrolyte additives and FiPFg salt on the reactivity between electrolyte and charged positive electrode material was investigated by ARC. The results shown here suggest that additives and FiPFe salt can play a different role in thermal stability depending on the positive electrode material [44]... 

Lithium bis(oxalato) borate was investigated as an additive for the stabilization of a high-voltage cathode electrolyte interface (57). It has been found that the electrochemical performance of Li/LiNio.5Mni.504 cells with a hthium bis(oxalato) borate additive was improved at 60°C. 

The effects of lithium bis(oxalato) borate on the electrolyte oxidative decomposition, the surface chemistry of separators and the cathodes cycled in electrolytes with and without a lithium bis(oxala-to) borate additive were assessed using ATR-FTIR spectroscopy and XPS (57). 

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