Active material for negative electrode, negative electrode piece, and secondary battery

A negative electrode active material, comprising a chelating resin and a metal ion;

• the chelating resin comprising a polymer skeleton and a chelating functional group;
• the chelating functional group being fixedly connected to the polymer skeleton via a chemical bond;
• the metal ion being connected with the chelating resin by an ionic bond and/or a coordinate bond via the chelating functional group;
• wherein,
• the chelating resin further comprises a free small molecular compound containing the chelating functional group;
• in the chelating resin, a mass percentage of the free small molecular compound containing the chelating functional is less than or equal to 1%;
• the metal ion is a divalent or multivalent metal ion.

A negative electrode plate, comprising:

• a negative electrode current collector;
• and
• a negative electrode film provided on the negative electrode current collector and comprising a negative electrode active material, a negative electrode conductive agent and a negative electrode binder;
• wherein,
• the negative electrode active material comprises a chelating resin and a metal ion;
• the chelating resin comprises a polymer skeleton and a chelating functional group;
• the chelating functional group is fixedly connected to the polymer skeleton via a chemical bond;
• the metal ion is connected with the chelating resin by an ionic bond and/or a coordinate bond via the chelating functional group;
• the chelating resin further comprises a free small molecular compound containing the chelating functional group;
• in the chelating resin, a mass percentage of the free small molecular compound containing the chelating functional is less than or equal to 1%;
• the metal ion is a divalent or multivalent metal ion.

A secondary battery, comprising a negative electrode plate;

• the negative electrode plate, comprising:
• a negative electrode current collector;
• and
• a negative electrode film provided on the negative electrode current collector and comprising a negative electrode active material, a negative electrode conductive agent and a negative electrode binder;
• wherein,
• the negative electrode active material comprises a chelating resin and a metal ion;
• the chelating resin comprises a polymer skeleton and a chelating functional group;
• the chelating functional group is fixedly connected to the polymer skeleton via a chemical bond;
• the metal ion is connected with the chelating resin by an ionic bond and/or a coordinate bond via the chelating functional group;
• the chelating resin further comprises a free small molecular compound containing the chelating functional group;
• in the chelating resin, a mass percentage of the free small molecular compound containing the chelating functional is less than or equal to 1%;
• the metal ion is a divalent or multivalent metal ion.