Metal negative electrode, preparation method therefor, and secondary battery

A method of making a metal negative electrode, comprising:

• forming a protective layer on a surface of one side or each of two sides of a metal negative electrode body, wherein the protective layer comprises a double-layer structure, wherein the double-layer structure comprises a liquid-state or gel-state inner layer that has an ability to dissolve alkali metal and a solid-state outer layer that has a high ionic conductivity;
• wherein the liquid-state or gel-state inner layer comprises at least one member selected from a first group consisting of an aromatic hydrocarbon small molecule compound and a polymer containing an aromatic hydrocarbon group and at least one member selected from a second group consisting of an ether small molecule solvent, an amine small molecule solvent, a thioether small molecule solvent, a polyether polymer, a polyamine polymer, and a polythioether polymer;
• wherein each member in the first group has an ability to accept an electron;
• and
• wherein each member in the second group has an ability to complex lithium ions.

A secondary battery, comprising;

• a positive electrode;
• a negative electrode;
• a diaphragm;
• and
• an electrolyte;
• wherein the negative electrode comprises a metal negative electrode, wherein the metal negative electrode comprises a metal negative electrode body and a protective layer formed on a surface of one side or each of two sides of the metal negative electrode body;
• and
• wherein the protective layer comprises a double-layer structure, wherein the double-layer structure comprises a liquid-state or gel-state inner layer that has an ability to dissolve alkali metal and a solid-state outer layer that has a high ionic conductivity;
• and
• wherein the liquid-state or gel-state inner layer comprises at least one member selected from a first group consisting of an aromatic hydrocarbon small molecule compound and a polymer containing an aromatic hydrocarbon , and at least one member selected from a second group consisting of an ether small molecule solvent, an amine small molecule solvent, a thioether small molecule solvent, a polyether polymer, a polyamine polymer, and a polythioether polymer;
• wherein each member in the first group has an ability to dissolve alkali metal;
• and
• wherein each member in the second group has an ability to complex lithium ions.

A terminal, comprising:

• a housing;
• a circuit mainboard accommodated in the housing;
• and
• a display apparatus mounted on the housing and connected to the circuit mainboard;
• a secondary battery;
• wherein the secondary battery is configured to supply power to the circuit mainboard and the display apparatus;
• wherein the secondary battery comprises a positive electrode, a negative electrode, a diaphragm, and an electrolyte;
• wherein the negative electrode comprises the metal negative electrode, wherein the metal negative electrode comprises a metal negative electrode body and a protective layer formed on a surface of one side or each of two sides of the metal negative electrode body;
• wherein the protective layer comprises a double-layer structure, wherein the double-layer structure comprises a liquid-state or gel-state inner layer that has an ability to dissolve alkali metal and a solid-state outer layer that has a high ionic conductivity;
• wherein the liquid-state or gel-state inner layer comprises at least one member from a first group consisting of an aromatic hydrocarbon small molecule compound and a polymer containing an aromatic hydrocarbon group , and at least one member selected from a second group consisting of an ether small molecule solvent, an amine small molecule solvent, a thioether small molecule solvent, a polyether polymer, a polyamine polymer, and a polythioether polymer;
• and
• wherein each member in the first group has an ability to dissolve alkali metal;
• and
• wherein each member in the second group has an ability to complex lithium ions.