US 2006/0188778 A1 · Non-aqueous electrolyte secondary battery and method of producing coating for negative electrode active material thereof

Abstract

A non-aqueous electrolyte secondary battery having a positive electrode and a negative electrode with an active material capable of absorbing and desorbing lithium, a separator interposed between the positive and negative electrodes, and a non-aqueous electrolyte. The negative electrode active material is covered by a coating having elasticity. The fully elastic coating expands and contracts following the volume change of the negative electrode active material; thus, the coating brings out its desired functions without being damaged or broken. Regardless of the degree of the volume change of the negative electrode active material, a lasting coating without damage is formed on the negative electrode active material, to improve performances of the non-aqueous electrolyte secondary battery.

Claims10

Dependent claims

A non-aqueous electrolyte secondary battery comprising:

a positive electrode including a positive electrode active material capable of absorbing and desorbing lithium;
a negative electrode including a negative electrode active material capable of absorbing and desorbing lithium;
a separator interposed between said positive electrode and said negative electrode;
and
a non-aqueous electrolyte;
wherein said negative electrode active material is covered by a coating, which comprises a polymer of a compound represented by the general formula (1):
where each of R1, R2, R3, R4, R5, and R6 independently represents a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, and at least one of R1, R2, R3, R4, R5, and R6 may include an atom having a lone pair.

4 more elements

A method of forming a coating for a negative electrode active material of a non-aqueous electrolyte secondary battery comprising a positive electrode including a positive electrode active material capable of absorbing and desorbing lithium, a negative electrode including a negative electrode active material capable of absorbing and desorbing lithium, a separator interposed between said positive electrode and said negative electrode, and a non-aqueous electrolyte, the method comprising:

a first step for adding, to said non-aqueous electrolyte secondary battery, a compound represented by the general formula (1):
where each of R1, R2, R3, R4, R5, and R6 independently represents a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, and at least one of R1, R2, R3, R4, R5, and R6 may include an atom having a lone pair;
and
a second step for polymerizing said compound represented by said general formula (1) to form a coating for covering said negative electrode active material inside of said non-aqueous electrolyte secondary battery.

1 more element

Dependencies are inferred from the claim text.

Non-aqueous electrolyte secondary battery and method of producing coating for negative electrode active material thereof

Life of this patent

Non-aqueous electrolyte secondary battery and method of producing coating for negative electrode active material thereof

Life of this patent

Abstract

Claims10