Secondary battery-use active material, secondary battery-use electrode, secondary battery, battery pack, electric vehicle, electric power storage system, electric power tool, and electronic apparatus

A secondary battery-use electrode, the secondary battery-use electrode including a lithium-containing compound, the lithium-containing compound having an average composition represented by a following Formula (1), wherein

• the lithium-containing compound includes a central section and a surface section,
• a molar ratio b1 of Mn in the surface section is larger than a molar ratio b2 of Mn in the central section,
• a molar ratio 1+a1 of Li in the surface section is smaller than a molar ratio 1+a2 of Li in the central section, and
• a ratio 1+a1/1+a2 between the molar ratio 1+a1 of Li in the surface section and the molar ratio 1+a2 of Li in the central section satisfies 0.5<1+a1/1+a2<1,
• Li1+a(MnbCocNi1-b-c)1−aMdO2-e (1)
• where M is one or more of Al, Mg, Zr, Ti, Ba, B, Si, and Fe;
• and a to e satisfy 0<a<0.25, 0.5≦b<0.7, 0≦c<1−b, 0≦d≦1, and 0≦e≦1.

A secondary battery-use active material, the secondary battery-use active material including a lithium-containing compound, the lithium-containing compound having an average composition represented by a following Formula (1), wherein

• the lithium-containing compound includes a central section and a surface section,
• a molar ratio b1 of Mn in the surface section is larger than a molar ratio b2 of Mn in the central section,
• a molar ratio 1+a1 of Li in the surface section is smaller than a molar ratio 1+a2 of Li in the central section, and
• a ratio 1+a1/1+a2 between the molar ratio 1+a1 of Li in the surface section and the molar ratio 1+a2 of Li in the central section satisfies 0.5<1+a1/1+a2<1,
• Li1+a(MnbCocNi1-b-c)1−aMdO2-e (1)
• where M is one or more of Al, Mg, Zr, Ti, Ba, B, Si, and Fe;
• and a to e satisfy 0<a<0.25, 0.5≦b<0.7, 0≦c<1−b, 0≦d≦1, and 0≦e≦1.

A battery pack comprising:

• a secondary battery;
• a control section configured to control operation of the secondary battery;
• and
• a switch section configured to switch the operation of the secondary battery according to an instruction of the control section, wherein
• the secondary battery includes a cathode, an anode, and an electrolytic solution,
• the cathode includes a lithium-containing compound, the lithium-containing compound having an average composition represented by a following Formula (1),
• the lithium-containing compound includes a central section and a surface section,
• a molar ratio b1 of Mn in the surface section is larger than a molar ratio b2 of Mn in the central section,
• a molar ratio 1+a1 of Li in the surface section is smaller than a molar ratio 1+a2 of Li in the central section, and
• a ratio 1+a1/1+a2 between the molar ratio 1+a1 of Li in the surface section and the molar ratio 1+a2 of Li in the central section satisfies 0.5<1+a1/1+a2<1,
• Li1+a(MnbCocNi1-b-c)1−aMdO2-e (1)
• where M is one or more of Al, Mg, Zr, Ti, Ba, B, Si, and Fe;
• and a to e satisfy 0<a<0.25, 0.5≦b<0.7, 0≦c<1−b, 0≦d≦1, and 0≦e≦1.

An electric vehicle comprising:

• a secondary battery;
• a conversion section configured to convert electric power supplied from the secondary battery into drive power;
• a drive section configured to operate according to the drive power;
• and
• a control section configured to control operation of the secondary battery, wherein
• the secondary battery includes a cathode, an anode, and an electrolytic solution,
• the cathode includes a lithium-containing compound, the lithium-containing compound having an average composition represented by a following Formula (1),
• the lithium-containing compound includes a central section and a surface section,
• a molar ratio b1 of Mn in the surface section is larger than a molar ratio b2 of Mn in the central section,
• a molar ratio 1+a1 of Li in the surface section is smaller than a molar ratio 1+a2 of Li in the central section, and
• a ratio 1+a1/1+a2 between the molar ratio 1+a1 of Li in the surface section and the molar ratio 1+a2 of Li in the central section satisfies 0.5<1+a1/1+a2<1,
• Li1+a(MnbCocNi1-b-c)1−aMdO2-e (1)
• where M is one or more of Al, Mg, Zr, Ti, Ba, B, Si, and Fe;
• and a to e satisfy 0<a<0.25, 0.5≦b<0.7, 0≦c<1−b, 0≦d≦1, and 0≦e≦1.

An electric power storage system comprising:

• a secondary battery;
• one or more electric devices configured to be supplied with electric power from the secondary battery;
• and
• a control section configured to control the supplying of the electric power from the secondary battery to the one or more electric devices, wherein
• the secondary battery includes a cathode, an anode, and an electrolytic solution,
• the cathode includes a lithium-containing compound, the lithium-containing compound having an average composition represented by a following Formula (1),
• the lithium-containing compound includes a central section and a surface section,
• a molar ratio b1 of Mn in the surface section is larger than a molar ratio b2 of Mn in the central section,
• a molar ratio 1+a1 of Li in the surface section is smaller than a molar ratio 1+a2 of Li in the central section, and
• a ratio 1+a1/1+a2 between the molar ratio 1+a1 of Li in the surface section and the molar ratio 1+a2 of Li in the central section satisfies 0.5<1+a1/1+a2<1,
• Li1+a(MnbCocNi1-b-c)1−aMdO2-e (1)
• where M is one or more of Al, Mg, Zr, Ti, Ba, B, Si, and Fe;
• and a to e satisfy 0<a<0.25, 0.5≦b<0.7, 0≦c<1−b, 0≦d≦1, and 0≦e≦1.

An electric power tool comprising:

• a secondary battery;
• and
• a movable section configured to be supplied with electric power from the secondary battery, wherein
• the secondary battery includes a cathode, an anode, and an electrolytic solution,
• the cathode includes a lithium-containing compound, the lithium-containing compound having an average composition represented by a following Formula (1),
• the lithium-containing compound includes a central section and a surface section,
• a molar ratio b1 of Mn in the surface section is larger than a molar ratio b2 of Mn in the central section,
• a molar ratio 1+a1 of Li in the surface section is smaller than a molar ratio 1+a2 of Li in the central section, and
• a ratio 1+a1/1+a2 between the molar ratio 1+a1 of Li in the surface section and the molar ratio 1+a2 of Li in the central section satisfies 0.5<1+a1/1+a2<1,
• Li1+a(MnbCocNi1-b-c)1−aMdO2-e (1)
• where M is one or more of Al, Mg, Zr, Ti, Ba, B, Si, and Fe;
• and a to e satisfy 0<a<0.25, 0.5≦b<0.7, 0≦c<1−b, 0≦d≦1, and 0≦e≦1.

An electronic apparatus comprising a secondary battery as an electric power supply source, wherein

• the secondary battery includes a cathode, an anode, and an electrolytic solution,
• the cathode includes a lithium-containing compound, the lithium-containing compound having an average composition represented by a following Formula (1),
• the lithium-containing compound includes a central section and a surface section,
• a molar ratio b1 of Mn in the surface section is larger than a molar ratio b2 of Mn in the central section,
• a molar ratio 1+a1 of Li in the surface section is smaller than a molar ratio 1+a2 of Li in the central section, and
• a ratio 1+a1/1+a2 between the molar ratio 1+a1 of Li in the surface section and the molar ratio 1+a2 of Li in the central section satisfies 0.5<1+a1/1+a2<1,
• Li1+a(MnbCocNi1-b-c)1−aMdO2-e (1)
• where M is one or more of Al, Mg, Zr, Ti, Ba, B, Si, and Fe;
• and a to e satisfy 0<a<0.25, 0.5≦b<0.7, 0≦c<1−b, 0≦d≦1, and 0≦e≦1.