LiBOB

Mn or Phosphate Cathode Treated Graphite Anode LiBOB - PC Electrolyte... 

Among these new borates, particular attention should be paid to a salt based on oxalato ligands, which has aroused intense interest recently in the lithium ion research and development community. This salt was invented by Lischka et al. and independently synthesized and investigated by Xu and Angell, who also gave it the popular name LiBOB. Following these extensive physical characterizations, a rather comprehensive electrochemical evaluation was conducted on this salt by Xu et 155,324,488,489 found that the solutions of LiBOB in mixed carbonate solvents met the complete set of stringent requirements for electrolyte solute intended for lithium ion cell applications (1) it is anodically stable on the surface of composite cathode materials up to 4.3 V, (2) it can form a protective SEI on the... 

Figure 51. Cathodic and anodic stability of LiBOB-based electrolytes on metal oxide cathode and graphitic anode materials Slow scan cyclic voltammetry of these electrode materials in LiBOB/EC/EMC electrolyte. The scan number and Coulombic efficiency (CE) for each scan are indicated in the graph. (Reproduced with permission from ref 155 (Eigure 2). Copyright 2002 The Electrochemical Society.)...

Figure 53. Stabilization of graphite in PC by LiBOB. Voltage profiles of lithium/graphite half-cells containing 1.0 m lithium salts in neat PC as electrolytes. Only for LiBOB/ PC was the complete lithiation/delithiation cycle achieved. (Reproduced with permission from ref 324 (Figure 1). Copyright 2002 The Electrochemical Society.)...

Further studies on LiBOB as a potential replacement for LiPFe were carried out by Liu et al., who reported that, due to the absence of HE and the much... 

Figure 54. Peculiar surface chemistry of BOB anion on graphitic anode material XPS C Is spectra for a graphitic anode surface cycled in LiBOB- and LiPF6-based electrolytes. The peaks were resolved into three major contributions representing (1) hydrocarbon at 284.5 eV, (2) oligo-ether linkages at 286.5 eV, and (3) lithium alkyl carbonates at 289.37 eV, respectively. (Reproduced with permission from ref 489 (Figure 3). Copyright 2003 The Electrochemical Society.)...

MacNeil and Dahn, whether the LiBOB-based electrolytes are safer against thermal runaway would still depend on their interaction with the cathode materials. 

On the basis of the findings on LiBOB performance in nonaqueous solvents and other advances made to improve the low-temperature performance of lithium ion electrolytes. Jow and co-workers proposed that an electrolyte with a much wider temperature range could be formulated using LiBOB alone or in combination with other salts. The following section (8.4) will be dedicated to this topic. 

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... 

W. Xu, C. A. Angell, Electrochem. Sohd-State Lett. 2001, 4, E1-E4. LiBOB and its derivatives. Weakly coordinating anions, and the exceptional conductivity of their nonaqueous solutions. 

K. Xu, U. Lee, S. Zhang, M. Wood, T. R. Jow, Electrochem. Solid-State Lett. 2003, 6, A144-A148. Chemical analysis of graphite/electrolyte interface formed in LiBOB-based electrolytes. 

J. Jiang, J. R. Dahn, Electrochem. Sohd-State Lett. 2003,6, A180-A182. Comparison of the theimal stabihty of Uthiated graphite in LiBOB EC/DEC and in LiPF,s EC/DEC. 

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