Battery material, anode, battery and manufacturing method of battery

1 . A battery material, which is a core-shell structure, the core-shell structure comprising:

a core; and

a shell, wherein the shell surrounds the core;

wherein a composition of the core is a silicon material;

wherein the shell comprises a polymer, the polymer is linear, the polymer comprises a first structure and a second structure, the first structure comprises a siloxane group, and the second structure comprises a carboxyl group or an ester group;

wherein the first structure is more adjacent to the core than the second structure;

wherein a diameter of the core is cD50, a membrane thickness of the shell is Ths, and the following condition is satisfied:

0<10×( Ths/cD 50)≤8.0.

2 . The battery material of claim 1 , wherein a precursor of the first structure is 3-trimethoxysilylpropyl 2-methylprop-2-enoate, and the composition of the core comprises silicon and silicon oxide.

3 . The battery material of claim 1 , wherein a precursor of the second structure is selected from a group consisting of methyl 2-methylprop-2-enoate, 2-ethylhexyl prop-2-enoate, methyl prop-2-enoate and prop-2-enoic acid.

4 . The battery material of claim 3 , wherein the precursor of the second structure is selected from at least two materials of the group consisting of methyl 2-methylprop-2-enoate, 2-ethylhexyl prop-2-enoate, methyl prop-2-enoate and prop-2-enoic acid.

5 . The battery material of claim 1 , wherein the diameter of the core is cD50, and the following condition is satisfied:

350 nm< cD 50<15000 nm.

6 . The battery material of claim 5 , wherein the membrane thickness of the shell is Ths, and the following condition is satisfied:

10 nm< Ths< 150 nm.

7 . The battery material of claim 1 , wherein the diameter of the core is cD50, and the following condition is satisfied:

30 nm< cD 50<150 nm.

8 . The battery material of claim 7 , wherein the membrane thickness of the shell is Ths, and the following condition is satisfied:

1 nm< Ths< 50 nm.

9 . The battery material of claim 1 , wherein the diameter of the core is cD50, the membrane thickness of the shell is Ths, and the following condition is satisfied:

0<10×( Ths/cD 50)≤6.0.

10 . An anode, comprising:

the battery material of claim 1 .

11 . The anode of claim 10 , further comprising:

a carbon material.

12 . The anode of claim 11 , wherein a total weight of the core-shell structure is Wk, a total weight of the carbon material is Wt, and the following condition is satisfied:

0.01<( Wk/Wt )<10.0.

13 . The anode of claim 11 , wherein a diameter of the carbon material at 10% of diameter cumulative distribution is gD10, a diameter of the carbon material at 50% of diameter cumulative distribution is gD50, a diameter of the carbon material at 90% of diameter cumulative distribution is gD90, and the following condition is satisfied:

0<( gD 90- gD 10)/ gD 50<5.0.

14 . The anode of claim 10 , wherein the anode comprises a coating layer, a thickness of the coating layer is ThA, and the following condition is satisfied:

50 μm< ThA< 350 μm.

15 . The anode of claim 14 , wherein a surface roughness of the coating layer of the anode is Ra, and the following condition is satisfied:

1.0 μm< Ra< 10.0 μm.

16 . A battery, comprising:

the anode of claim 10 .

17 . The battery of claim 16 , wherein a discharge volumetric capacity of a first cycle of the battery is vC1, and the following condition is satisfied:

30 mAh/cm 3 ≤vC 1≤200 mAh/cm 3 .

18 . The battery of claim 16 , wherein a maximum of discharge volumetric capacities from a first cycle of the battery to a tenth cycle of the battery is vCMax, and the following condition is satisfied:

30 mAh/cm 3 ≤vC Max≤200 mAh/cm 3 .

19 . The battery of claim 16 , wherein a discharge volumetric capacity of a fifth cycle of the battery is vC5, a discharge volumetric capacity of a tenth cycle of the battery is vC10, and the following condition is satisfied:

0.80 ≤vC 10/ vC 5.

20 . The battery of claim 16 , wherein a total number of Coulombic efficiency greater than 85% in first ten cycles of the battery is nCE10, and the following condition is satisfied:

7 ≤nCE 10.

21 . A battery material, which is a core-shell structure, the core-shell structure comprising:

a core; and

a shell, wherein the shell surrounds the core;

wherein a composition of the core is a silicon material;

wherein the shell comprises a polymer, the polymer is linear, the polymer comprises a first structure and a second structure, the first structure comprises a siloxane group, and the second structure comprises a carboxyl group or an ester group;

wherein the first structure is more adjacent to the core than the second structure;

wherein a diameter of the core is cD50, and the following condition is satisfied:

30 nm< cD 50.

22 . The battery material of claim 21 , wherein the diameter of the core is cD50, and the following condition is satisfied:

40 nm< cD 50<15000 nm.

23 . The battery material of claim 21 , wherein the composition of the core comprises silicon and silicon oxide.

24 . An anode, comprising:

the battery material of claim 21 .

25 . The anode of claim 24 , further comprising:

a carbon material.

26 . A battery, comprising:

the anode of claim 24 .

27 . The battery of claim 26 , wherein a maximum of discharge volumetric capacities from a first cycle of the battery to a tenth cycle of the battery is vCMax, and the following condition is satisfied:

30 mAh/cm 3 ≤vC Max≤200 mAh/cm 3 .

28 . The battery of claim 26 , wherein a discharge volumetric capacity of a fifth cycle of the battery is vC5, a discharge volumetric capacity of a tenth cycle of the battery is vC10, and the following condition is satisfied:

0.80 ≤vC 10/ vC 5.

29 . The battery of claim 26 , wherein a total number of Coulombic efficiency greater than 85% in first ten cycles of the battery is nCE10, and the following condition is satisfied:

7 ≤nCE 10.