Binder compound, conductive binder, and secondary battery containing same
AssigneeContemporary Amperex Technology Co., Limited
InventorsMengqin Zhang, Yanjie Zhao, Jianghui Lin, Xing Li, Haizu Jin
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Abstract
A binder compound, a conductive binder, and a secondary battery containing the same are provided. In some embodiments, the binder compound of the present disclosure has a structure of formula (I), where R1 and R2 each independently represent a straight or branched C1-12 alkyl; R3 represents a halogen or cyano group; R4 represents a hydroxymethyl or amino; Z represents a straight or branched C1-12 alkylene; and m represents an integer selected from 7600-47000. The binder compound and the conductive binder of the present disclosure can improve the storage and cycle performances of the secondary battery.
Claims20
A binder compound, which has a structure of formula (I):
- wherein R1 and R2 each independently represent a straight or branched C1-12 alkyl;
- R3 represents a halogen or cyano group;
- R4 represents a hydroxymethyl or amino;
- Z represents a straight or branched C1-12 alkylene;
- and m represents an integer selected from 7600-47000.
A preparation method of a binder compound, the method comprising:
- (i) making, in presence of an initiator, a chain transfer agent of formula (II) to undergo a polymerization reaction with a vinylidene fluoride monomer in a solvent:
- wherein R1 and R2 each independently represents a straight or branched C1-12 alkyl, R3 represents a halogen or cyano group, and Z represents a straight or branched C1-12 alkylene;
- (ii) making a reaction product obtained in step (i) to react with a reducing agent in a solvent to obtain a compound of a following formula (I);
- or
- (iii) making the reaction product obtained in step (i) react with an amination agent in a solvent;
- and
- (iv) making a reaction product obtained in step (iii) to react with an oxidant under an alkaline condition, to obtain a binder compound of the following formula (I),
- wherein R4 represents a hydroxymethyl or amino;
- and m represents an integer selected from 7600-47000.
A conductive binder, which contains a carbon-based conductive agent moiety and a binder moiety covalently linked to the carbon-based conductive agent moiety, wherein the binder moiety has a structure of formula (III):
- wherein R1 and R2 each independently represents a straight or branched C1-12 alkyl, R3 represents a halogen or cyano group, R4 represents a hydroxymethyl or amino;
- Z represents a straight or branched C1-12 alkylene;
- and m represents an integer selected from 7600-47000;
- R5 represents #-CH2OC(O)-* or #-NHC(O)-*, and # represents a position linked to Z, and * indicates a position covalently linked to the carbon-based conductive agent moiety.
A preparation method of a conductive binder, the method comprising:
- making a binder compound of formula (I), a carbon-based conductive agent, and a catalyst to react in a solvent to obtain a conductive binder:
- where R1 and R2 each independently represents a straight or branched C1-12 alkyl, R3 represents a halogen or cyano group, R4 represents a hydroxymethyl or amino;
- Z represents a straight or branched C1-12 alkylene;
- and m represents an integer selected from 7600-47000.
Dependencies are inferred from the claim text.