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, comprising:

a positive electrode active material; and

a positive electrode additive, wherein the positive electrode additive comprises at least one of oxides, sulphides, peroxides, azides, or oxycarbides, of sodium or potassium.

2 . The positive electrode composite material according to claim 1 , wherein the positive electrode additive comprises the oxycarbide of sodium or potassium, comprising at least one of Na 2 CO 3 , K 2 CO 3 , Na 2 C 2 O 4 , and K 2 C 2 O 4 .

3 . The positive electrode composite material according to claim 1 , wherein:

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

4 . The positive electrode composite material according to claim 3 , wherein:

relative to the total of 100 wt % of the positive electrode active material and the positive electrode additive, the positive electrode additive has a content of 0.5 wt %-4 wt %.

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

the positive electrode composite material according to claim 1 .

6 . A positive electrode for a lithium ion secondary battery, comprising:

a positive electrode current collector;

a positive electrode active material layer comprising a positive electrode active material; and

a positive electrode additive layer comprising a positive electrode additive, wherein the positive electrode additive comprises at least one of oxides, sulphides, peroxides, azides, or oxycarbides of sodium or potassium.

7 . The positive electrode according to claim 6 , wherein the positive electrode additive comprises the oxycarbide of sodium or potassium, comprising at least one of Na 2 CO 3 , K 2 CO 3 , Na 2 C 2 O 4 , or K 2 C 2 O 4 .

8 . The positive electrode according to claim 6 , wherein:

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

9 . The positive electrode according to claim 6 , wherein:

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

10 . The positive electrode according to claim 9 , wherein:

relative to the total of 100 wt % of the positive electrode active material and the positive electrode additive, the positive electrode additive has a content of 0.5 wt %-4 wt %.

11 . A lithium ion secondary battery, comprising:

a positive electrode comprising a positive electrode composite material, the positive electrode composite material comprising:

a positive electrode active material; and

a positive electrode additive, wherein the positive electrode additive comprises at least one of oxides, sulphides, peroxides, azides, or oxycarbides, of sodium or potassium; and

a negative electrode.

12 . The lithium ion secondary battery according to claim 11 , wherein:

the negative electrode comprises a negative electrode active material; and

the negative electrode active material comprises at least one a carbon material, a metal or nonmetal compound, a coated material of the compound, or a doped material of the compound.

13 . The lithium ion secondary battery according to claim 12 , wherein:

the carbon material comprises at least one of graphite, hard carbon, or soft carbon;

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

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

the doped material of the compound comprises a doped material obtained by doping the metal or nonmetal compound with at least one of Mg, Ni, Co, or Mn.

14 . The lithium ion secondary battery according to claim 12 , wherein:

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

15 . A power consuming device, comprising the lithium ion secondary battery according to claim 11 .