申请人:UTSUMI Hisayuki
公开号:US20110256457A1
公开(公告)日:2011-10-20
A nonaqueous secondary battery, comprising: a positive electrode; a negative electrode; and a nonaqueous electrolyte solution, the nonaqueous electrolyte solution containing as a flame retardant a compound of the general formula (I):
wherein R
1
and R
2
, which are the same or different, each represents a group that is selected from a hydrogen atom, a lower alkyl, lower alkenyl, lower alkoxy, lower alkoxycarbonyl, lower alkylcarbonyl, lower cycloalkyl or aryl group, and that may have a substituent, or R
1
and R
2
taken together are a methylene group that may have a substituent, or R
1
and R
2
taken together form a ring structure containing a nitrogen atom to which R
1
and R
2
are attached, the ring structure being a five-membered or six-membered hydrocarbon ring that may have one or two oxo groups, or a five-membered or six-membered heterocycle that may further contain a nitrogen atom; n is 0 or 1; when n is 0, R
3
is a group that is selected from a hydrogen atom, a halogen atom, a lower alkyl, lower alkenyl, lower alkoxy, lower alkoxycarbonyl, lower alkylcarbonyl, lower cycloalkyl or aryl group, and that may have a substituent; and when n is 1, R
3
and R
4
are as defined for R
1
and R
2
.