FIELD: electricity.
SUBSTANCE: positive electrode has an active material of positive electrode which operates at the potential 4.5 V or higher with reference to lithium; and liquid electrolyte contains the fluorinated simple ether represented by the following formula (1), and the cyclic sulphonate represented by the following formula (2): (1). 
And in the formula (1) R1 and R2, both independently, designate alkylene group or the fluorinated alkylene group, and, at least, either R1 or R2 is the fluorinated alkylene group; and (2) 
where in the formula (2) A and B, both independently, designate alkylene group or the fluorinated alkylene group, and X designates unary bond or the group - OSO2-.
EFFECT: battery includes a positive electrode which can absorb and emit lithium, and liquid electrolyte.
10 cl, 1 dwg, 5 tbl, 35 ex
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