Non-aqueous liquid electrolyte and non-aqueous liquid electrolyte secondary battery
A non-aqueous liquid electrolyte secondary battery using negative-electrode active material having Si, Sn and/or Pb, with high charge-capacity, superior characteristics including discharge-capacity retention rate over long is provided. The non-aqueous liquid electrolyte of the battery contains carbonate having unsaturated bond and/or halogen and and an anhydride compound.
1. A non-aqueous liquid electrolyte secondary battery, comprising:
a negative electrode comprising carbon material and a negative-electrode active material containing Si atom,
a positive electrode; and
a non-aqueous liquid electrolyte,
wherein
the negative electrode and the positive electrode intercalate and deintercalate lithium ions, and
the non-aqueous liquid electrolyte comprises:
a carbonate having at least one of an unsaturated bond, wherein the carbonate having an unsaturated bond is at least one compound selected from the group consisting of vinylene carbonate, and vinylethylene carbonate in an amount of 0.01 wt % to 5.0 wt % relative to the total weight of the non-aqueous electrolyte,
a fluoroethylene carbonate in an amount of 5 wt % to 40 wt % relative to the total weight of the non-aqueous liquid electrolyte, and
at least one compound represented by formula (B-1):
wherein R b1 and R b2 each, independently, is an optionally substituted hydrocarbon group of 15 carbons or less, and R b1 and Rb 2 may be connected to each other to form a ring structure.
2. The non-aqueous liquid electrolyte secondary battery according to claim 1 , wherein R b1 and R b2 are connected to each other directly to form a ring structure.
3. The non-aqueous liquid electrolyte secondary battery according to claim 1 , wherein the non-aqueous liquid electrolyte further comprises ethylene carbonate and/or propylene carbonate.
4. The non-aqueous liquid electrolyte secondary battery according to claim 1 , wherein the non-aqueous liquid electrolyte further comprises at least one carbonate selected from the group consisting of dimethyl carbonate, ethylmethyl carbonate, diethyl carbonate, methyl-n-propyl carbonate, ethyl-n-propyl carbonate, and di-n-propyl carbonate.
5. The non-aqueous liquid electrolyte secondary battery according to claim 1 , wherein the compound represented by formula (B-1) comprises at least one compound selected from the group consisting of succinic acid anhydride, 4-methylsuccinic acid anhydride, 4,4-dimethylsuccinic acid anhydride, 4,5-dimethylsuccinic acid anhydride, 4,4,5-trimethylsuccinic acid anhydride, 4,4,5,5-tetramethylsuccinic acid anhydride, 4-vinylsuccinic acid anhydride, 4,5-divinylsuccinic acid anhydride, 4-phenylsuccinic acid anhydride, 4,5-diphenylsuccinic acid anhydride, 4,4-diphenylsuccinic acid anhydride, citraconic acid anhydride, maleic acid anhydride, 4-methylmaleic acid anhydride, 4,5-dimethylmaleic acid anhydride, 4-phenylmaleic acid anhydride, 4,5-diphenylmaleic acid anhydride, itaconic acidanhydride, 5-methylitaconic acid anhydride, 5,5-dimethylitaconic acid anhydride, glutaric acid anhydride, phthalic acid anhydride, and 3,4,5,6-tetrahydrophthalic acid anhydride, 4-fluorosuccinic acid anhydride, 4,4-difluorosuccinic acid anhydride, 4,5-difluorosuccinic acid anhydride, 4,4,5-trifluorosuccinic acid anhydride, 4,4,5,5tetrafluorosuccinic acid anhydride, 4-fluoromaleic acid anhydride, 4,5-difluoromaleic acid anhydride, 5-fluoroitaconic acid anhydride, and 5,5-difluoroitaconic acid anhydride.
6. The non-aqueous liquid electrolyte secondary battery according to claim 1 , wherein the compound represented by formula (B-1) comprises at least one compound selected from the group consisting of succinic acid anhydride, 4-methylsuccinic acid anhydride, 4,4-dimethylsuccinic acid anhydride, 4,5-dimethylsuccinic acid anhydride, 4,4,5-trimethylsuccinic acid anhydride, 4,4,5,5-tetramethylsuccinic acid anhydride, 4-vinylsuccinic acid anhydride, 4,5-divinylsuccinic acid anhydride, 4- phenylsuccinic acid anhydride, 4,5-diphenylsuccinic acid anhydride, 4,4-diphenylsuccinic acid anhydride, citraconic acid anhydride, maleic acid anhydride, 4-methylmaleic acid anhydride, 4,5-dimethylmaleic acid anhydride, 4-phenylmaleic acid anhydride, 4,5- diphenylmaleic acid anhydride, itaconic acid anhydride, 5-methylitaconic acid anhydride, 5,5-dimethylitaconic acid anhydride, glutaric acid anhydride, phthalic acid anhydride, and 3,4,5,6-tetrahydrophthalic acid anhydride.
7. The non-aqeous liquid electrolyte secondary battery according to claim 1 , wherein the carbonate having unsaturated bond is vinylene carbonate.
8. The non-aqeous liquid electrolyte secondary battery, according to claim 1 , wherein the concentration of the flouroethylene carbonate is 20 wt % to 40 wt %.