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US 9,793,545 B2Granted
Magnesium battery comprising positive-electrode mixture with graphite fluoride and copper
AssigneeSony Corporation
InventorsKenta Yamamoto, Yuri Nakayama, Yui Senda
Life of this patent
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Abstract
A Mg battery has a positive-electrode can, a positive-electrode pellet made of a positive-electrode active material or the like, a positive electrode composed of a metallic net supporting body, a negative-electrode cup, a negative electrode made of a negative-electrode active material, and a separator impregnated with an electrolytic solution and disposed between the positive-electrode pellet and the negative-electrode active material. By adopting a structure that copper contacts the positive-electrode active material, the electrochemical device can be given a large discharge capacity.
Claims12
An electrochemical device configured as a magnesium battery, the electrochemical device comprising:
- a negative-electrode active material consisting of one or both of a magnesium metal and a magnesium alloy;
- a positive-electrode mixture comprising copper and a positive-electrode active material including a graphite fluoride, wherein copper is at a mass ratio of at least 8.5 per a mass ratio of 100 of the graphite fluoride;
- and
- a nonaqueous electrolytic solution comprising magnesium ions dissolved in an ether system organic solvent in which one or more of metal magnesium, alkyl trifluoromethanesulfonate having a general formula RCF3SO3, a quaternary ammonium salt having a general formula R1R2R3R4N+Z− and a 1,3-alkyl methylimidazolium salt having a general formula R(C3H3N2)CH3]+X− is added to the ether system organic solvent,
- wherein in the general formula RCF3SO3, R is a methyl group or an ethyl group, and the alkyl trifluoromethanesulfonate is added at a ratio of equal to or more than 0.8 mol and equal to or less than 1.2 mol per 1.0 mol of the metal magnesium,
- wherein in the general formula R1R2R3R4N+Z−, each of R1, R2, R3, and R4 is an alkyl group or an aryl group, and Z− is selected from the group consisting of a chloride ion (Cl−), a bromide ion (Br−), an iodine ion (I−), an acetic acid ion (CH3COO−), a perchloric acid ion (ClO4−), a tetrafluoroboric acid ion (BF4−), a hexafluorophosphoric acid ion (PF6−), a hexafluoroarsenic acid ion (AsF6−), a perfluoroalkylsulfonic acid ion (Rf1SO3−) where Rf1 is a perfluoroalkyl group, and a perfluoroalkylsulfonyl imide ion ((Rf2SO2)2N−) where Rf2 is a perfluoroalkyl group,
- wherein in the general formula [R(C3H3N2)CH3]+X−, R is a methyl group, an ethyl group or a butyl group, and X− is selected from the group consisting of a tetrafluoroboric acid ion (BF4−) and a bis(trifluoromethanesulfonyl)imide ion ((SO2CF3)1N−), and
- wherein any one of the quaternary ammonium salt or the 1,3-alkyl methylimidazolium salt is added at a ratio of equal to or more than 1.0 mol and equal to or less than 2.0 mol in total per 1.0 mol of the metal magnesium.
5 more elements
An electrochemical device configured as a magnesium battery, the electrochemical device comprising:
- a negative-electrode active material consisting of one or both of a magnesium metal and a magnesium alloy;
- a positive-electrode mixture comprising copper and a positive-electrode active material comprising a graphite fluoride, wherein copper is at a mass ratio of at least 8.5 per a mass ratio of 100 of the graphite fluoride;
- one or more of a positive-electrode power collecting body comprising copper, a positive-electrode power collecting body comprising a conductive material covered with copper, and a positive-electrode can having an inner surface covered with copper contacting the positive-electrode active material;
- and
- a nonaqueous electrolytic solution comprising magnesium ions dissolved in an ether system organic solvent in which one or more of metal magnesium, alkyl trifluoromethanesulfonate having a general formula RCF3SO3, a quaternary ammonium salt having a general formula R1R2R3R4N+Z− and a 1,3-alkyl methylimidazolium salt having a general formula R(C3H3N2)CH3]+X− is added to the ether system organic solvent,
- wherein in the general formula RCF3SO3, R is a methyl group or an ethyl group, and the alkyl trifluoromethanesulfonate is added at a ratio of equal to or more than 0.8 mol and equal to or less than 1.2 mol per 1.0 mol of the metal magnesium,
- wherein in the general formula R1R2R3R4N+Z−, each of R1, R2, R3, and R4 is an alkyl group or an aryl group, and Z− is selected from the group consisting of a chloride ion (Cl−), a bromide ion (Br−), an iodine ion (I−), an acetic acid ion (CH3COO−), a perchloric acid ion (ClO4−) a tetrafluoroboric acid ion (BF4−), a hexafluorophosphoric acid ion (PF6−), a hexafluoroarsenic acid ion (AsF6−), a perfluoroalkylsulfonic acid ion (Rf1SO3−) where Rf1 is a perfluoroalkyl group, and a perfluoroalkylsulfonyl imide ion ((Rf2SO2)2N−) where Rf2 is a perfluoroalkyl group,
- wherein in the general formula [R(C3H3N2)CH3]+X−, R is a methyl group, an ethyl group or a butyl group, and X− is selected from the group consisting of a tetrafluoroboric acid ion (BF4−) and a bis(trifluoromethanesulfonyl)imide ion ((SO2CF3)2N−, and
- wherein any one of the quaternary ammonium salt or the 1,3-alkyl methylimidazolium salt is added at a ratio of equal to or more than 1.0 mol and equal to or less than 2.0 mol in total per 1.0 mol of the metal magnesium.
6 more elements
Dependencies are inferred from the claim text.