Lithium bis salicylato

Figure 8. Linear correlation of HOMOcO energies and anodic oxidation limits of lithium borates Li[B(C6 H4 jF102)2], x=0 (1), x=l (2), and x=4 (3) Li[B( O2C 0H6)2l (4) lithium bis[salicylato (2-)]borate (6) and lithium bis [ 2,2 - biphenyldio-lato (2 -) -0,0 lborate (5).

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, ... 

Lithium difluoro(oxalato)bQrale (LiDFOB, 8, Hg. 2.18) also shows the same effect as the additive for an electrolyte [74], Lithium bis[salicylato(2-)] borate (LiBSB, 9) [75], lithium bis[croconate]-borate (LiBCB, 10) [76], and lithium bis[l,2-... 

The electrolyte may further include an additive selected from Uthium bis(oxalate)borate, lithium bis(salicylato)borate, and a combination thereof. These compoimds improve the thermal stability of an electrolyte and the cycle life of a battery. 

Figure 17.6 Linear correlation of HOMO-energies and anodic oxidation limits of lithium borates Li[B(C6H4.xFx02)2], X = 0 (1) X = 1 (2), and X = 4 (3), Li[B(02C,oH6)2] (4), lithium bis[2,2 -biphenyldiolato(2—)-0,0 ]borate (5), and lithium bis[salicylato(2-)]borate (5).

The synthesis of a salicyclic organoborate is shown in Figure 2.14. The preparation of lithium bis[5-(2,4-difluorophenyl)salicylato-2-]-borate has been reported in detail as (63) ... 

Preparation 2-6 First, 2.5 g (0.01 mol) of 5-(2,4-difluorophenyl)salicylic acid, 0.21 g (0.005 mol) of lithium hydroxide monohydrate, and 0.31 g (0.005 mol) of boric acid were put into a flask, and an acetonitrile/methanol (2 1 by volume) solvent was added thereto, preparing a mixed solution. The mixed solution was refluxed for 8 h and agitated at room temperature for one night. Next, the solution was concentrated down to 1/4 thereof and allowed to stand at room temperature, obtaining a white crystal. The white crystal was filtrated and recrystallized using an acetonitrile/methanol solvent. Then, the recrystallized product was dried in a 100°C vacuum oven for 24 h, obtaining lithium bis[5-(2,4-difluorophenyl)salicylato-2-]borate. 

When lithium bis[5-(2,4 di luorophenyl)salicylato-2-]borate is added to an electrolyte, the compound may improve the electrochemical characteristics and the dissolution capability (63). 

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