ELECTROLYTE AND ENERGY STORAGE DEVICE
The present disclosure provides an electrolyte and an energy storage device. The electrolyte includes, by mass of electrolyte, a fluorinated solvent with a mass percentage a, a cyclic carbonate with a mass percentage b, and a lithium hexafluorophosphate with a mass percentage c, wherein 1%≤a≤30%, 25%≤b≤45%, and 7%≤c≤10%.
1 . An electrolyte, wherein, the electrolyte comprises, by mass of electrolyte, a fluorinated solvent with a mass percentage a, a cyclic carbonate with a mass percentage b, and a lithium hexafluorophosphate with a mass percentage c, wherein 1%≤a≤30%, 25%≤b≤45%, and 7%≤c≤10%.
2 . The electrolyte according to claim 1 , wherein the cyclic carbonate is selected from at least one of vinyl carbonate, propylene carbonate, fluorinated vinyl carbonate, difluorinated vinyl carbonate, and vinylidene carbonate.
3 . The electrolyte according to claim 1 , wherein the fluorinated solvent comprises at least one of fluorinated carbonate, fluorinated carboxylic acid ester, and fluorinated ether.
4 . The electrolyte according to claim 3 , wherein the fluorinated carbonate is selected from at least one of chemical formula (I-1) to chemical formula (I-7):
the fluorinated carboxylic acid ester is selected from at least one of chemical formula (I-8) to chemical formula (I-17):
the fluorinated ether is selected from at least one of chemical formula (1-18) to chemical formula (1-21):
5 . The electrolyte according to claim 1 , wherein the electrolyte comprises a lithium salt; the lithium salt comprises the lithium hexafluorophosphate; the lithium salt further comprises at least one of lithium difluorophosphate, lithium bis(fluorosulfonyl)imide, bistrifluoromethanesulfonimide lithium salt, lithium oxalyldifluoro borate, lithium bis(oxalate)borate, and lithium tetrafluoroborate.
6 . The electrolyte according to claim 2 , wherein the electrolyte comprises a lithium salt; the lithium salt comprises the lithium hexafluorophosphate; the lithium salt further comprises at least one of lithium difluorophosphate, lithium bis(fluorosulfonyl)imide, bistrifluoromethanesulfonimide lithium salt, lithium oxalyldifluoro borate, lithium bis(oxalate)borate, and lithium tetrafluoroborate.
7 . The electrolyte according to claim 3 , wherein the electrolyte comprises a lithium salt; the lithium salt comprises the lithium hexafluorophosphate; the lithium salt further comprises at least one of lithium difluorophosphate, lithium bis(fluorosulfonyl)imide, bistrifluoromethanesulfonimide lithium salt, lithium oxalyldifluoro borate, lithium bis(oxalate)borate, and lithium tetrafluoroborate.
8 . The electrolyte according to claim 4 , wherein the electrolyte comprises a lithium salt; the lithium salt comprises the lithium hexafluorophosphate; the lithium salt further comprises at least one of lithium difluorophosphate, lithium bis(fluorosulfonyl)imide, bistrifluoromethanesulfonimide lithium salt, lithium oxalyldifluoro borate, lithium bis(oxalate)borate, and lithium tetrafluoroborate.
9 . An energy storage device, wherein the energy storage device comprises a positive electrode sheet and an electrolyte, wherein the electrolyte comprises, by mass of electrolyte, a fluorinated solvent with a mass percentage a, a cyclic carbonate with a mass percentage b, and a lithium hexafluorophosphate with a mass percentage c, wherein 1%≤a≤30%, 25%≤b≤45%, and 7%≤c≤10%.
10 . The energy storage device to claim 9 , wherein the cyclic carbonate is selected from at least one of vinyl carbonate, propylene carbonate, fluorinated vinyl carbonate, difluorinated vinyl carbonate, and vinylidene carbonate.
11 . The energy storage device according to claim 9 , wherein the fluorinated solvent comprises at least one of fluorinated carbonate, fluorinated carboxylic acid ester, and fluorinated ether.
12 . The energy storage device according to claim 11 , wherein the fluorinated carbonate is selected from at least one of chemical formula (I-1) to chemical formula (I-7):
the fluorinated carboxylic acid ester is selected from at least one of chemical formula (I-8) to chemical formula (I-17):
the fluorinated ether is selected from at least one of chemical formula (1-18) to chemical formula (I-21):
13 . The energy storage device according to claim 9 , wherein the electrolyte comprises a lithium salt; the lithium salt comprises the lithium hexafluorophosphate; the lithium salt further comprises at least one of lithium difluorophosphate, lithium bis(fluorosulfonyl)imide, bistrifluoromethanesulfonimide lithium salt, lithium oxalyldifluoro borate, lithium bis(oxalate)borate, and lithium tetrafluoroborate.
14 . The energy storage device according to claim 10 , wherein the electrolyte comprises a lithium salt; the lithium salt comprises the lithium hexafluorophosphate; the lithium salt further comprises at least one of lithium difluorophosphate, lithium bis(fluorosulfonyl)imide, bistrifluoromethanesulfonimide lithium salt, lithium oxalyldifluoro borate, lithium bis(oxalate)borate, and lithium tetrafluoroborate.
15 . The energy storage device according to claim 11 , wherein the electrolyte comprises a lithium salt; the lithium salt comprises the lithium hexafluorophosphate; the lithium salt further comprises at least one of lithium difluorophosphate, lithium bis(fluorosulfonyl)imide, bistrifluoromethanesulfonimide lithium salt, lithium oxalyldifluoro borate, lithium bis(oxalate)borate, and lithium tetrafluoroborate.
16 . The energy storage device according to claim 12 , wherein the electrolyte comprises a lithium salt; the lithium salt comprises the lithium hexafluorophosphate; the lithium salt further comprises at least one of lithium difluorophosphate, lithium bis(fluorosulfonyl)imide, bistrifluoromethanesulfonimide lithium salt, lithium oxalyldifluoro borate, lithium bis(oxalate)borate, and lithium tetrafluoroborate.
17 . The energy storage device according to claim 9 , wherein the positive electrode sheet comprises an anode current collector and an anode active layer coated on a surface of the anode current collector, and in the positive electrode sheet, a coating density of the anode active layer is t g/1540.25 mm 2 , and the following relation is satisfied: 0.07≤(1−a−b)*c/t≤0.288.
18 . The energy storage device according to claim 17 , wherein 0.25≤t≤0.4.
19 . The energy storage device according to claim 17 , wherein materials in the anode active layer comprises lithium iron phosphate.
20 . The energy storage device according to claim 17 , wherein the energy storage device has a capacity of not less than 280 Ah.