POSITIVE ELECTRODE COMPOSITE MATERIAL FOR LITHIUM ION SECONDARY BATTERY, POSITIVE ELECTRODE AND BATTERY

1 . A positive electrode composite material for a lithium ion secondary battery, characterized by

comprising a positive electrode active material and an alkali metal oxide as shown by formula A m GO n , wherein A represents at least one element selected from Na and K and optionally Li, G represents at least one element selected from Fe, Ni, Co, Mn, Ru, Ir, Sn, Cr, Nb, Mo, V and Ti, m is 1-6, and n is 1-4.

2 . The positive electrode composite material according to claim 1 , characterized in that

the alkali metal oxide is selected from at least one of Na 6 FeO 4 , K 6 FeO 4 , Na 6 CoO 4 , K 6 CoO 4 , Li 2 Na 4 FeO 4 and Li 2 K 4 FeO 4 .

3 . The positive electrode composite material according to claim 1 , characterized in that

relative to a total of 100 wt % of the positive electrode active material and the alkali metal oxide, the alkali metal oxide has a content of 0.1 wt %-10 wt %.

4 . A positive electrode for a lithium ion secondary battery, characterized by comprising a positive electrode composite material according to claim 1 .

5 . A positive electrode for a lithium ion secondary battery, characterized by comprising:

a positive electrode current collector, a positive electrode active material layer comprising a positive electrode active material, and an alkali metal oxide layer comprising an alkali metal oxide, wherein

the alkali metal oxide is shown by formula A m GO n , wherein A represents at least one element selected from Na and K and Li, G represents at least one element selected from Fe, Ni, Co, Mn, Ru, Ir, Sn, Cr, Nb, Mo, V and Ti, m is 1-6, and n is 1-4.

6 . The positive electrode for a lithium ion secondary battery according to claim 5 , characterized in that

the alkali metal oxide is selected from at least one of Na 6 FeO 4 , K 6 FeO 4 , Na 6 CoO 4 , K 6 CoO 4 , Li 2 Na 4 FeO 4 and Li 2 K 4 FeO 4 .

7 . The positive electrode for a lithium ion secondary battery according to claim 5 , characterized in that

the alkali metal oxide layer is disposed between the positive electrode current collector and the positive electrode active material layer, or on the positive electrode active material layer.

8 . The positive electrode for a lithium ion secondary battery according to claim 5 , characterized in that

relative to a total of 100 wt % of the positive electrode active material and the alkali metal oxide, the alkali metal oxide has a content of 0.1 wt %-10 wt %.

9 . A lithium ion secondary battery, characterized by

comprising a positive electrode for a lithium ion secondary battery according to claim 4 and a negative electrode.

10 . The lithium ion secondary battery according to claim 9 , characterized in that

the negative electrode comprises a negative electrode active material, wherein

the negative electrode active material comprises at least one selected from a carbon material, a metal or a nonmetal compound and a coating of the compound and a dopant of the compound.

11 . The lithium ion secondary battery according to claim 10 , characterized in that

the carbon material comprises at least one selected from graphite, hard carbon and soft carbon,

the metal or nonmetal compound comprises at least one selected from oxides, sulphides, selenides and fluorides of silicon, selenium, sulphur, phosphorus, tin, titanium or vanadium,

the coating of the compound comprises: a coating obtained by coating the metal or nonmetal compound with graphite, soft carbon or hard carbon, and

the dopant of the compound comprises: a dopant obtained by doping the metal or nonmetal compound with at least one element selected from Mg, Ni, Co, and Mn.

12 . The lithium ion secondary battery according to claim 10 , characterized in that

the metal or nonmetal compound comprises at least one selected from SiO 2 , SiO, SnO 2 , TiO 2 , SiS 2 and TiS 2 .

13 . A power consuming device, characterized by

comprising a lithium ion secondary battery according to claim 9 .