| abstract |
In the prior art, phosphate dibasic phosphate, which is expensive and difficult to obtain, is obtained easily and efficiently from a readily available and high purity material. In addition, a battery having excellent low-temperature discharge characteristics and high-current discharge characteristics and excellent high-temperature storage characteristics and cycle characteristics is produced without sacrificing safety. 6 fluorophosphate and a compound having a bond represented by the following formula (1) in the molecule. Si-O-Si (1) Also, as a non-aqueous liquid electrolyte for use in a non-aqueous liquid electrolyte secondary battery comprising a negative electrode capable of storing and releasing ions and a positive electrode and a non-aqueous liquid electrolyte, at least one non-aqueous solvent, hexafluorophosphate, ), And then removing the compound having a lower boiling point than the compound having a bond represented by the formula (1), which is newly produced in the system, to prepare a nonaqueous electrolyte solution. Si-O-Si (1) |