NEGATIVE ELECTRODE FOR LITHIUM ION BATTERY, METHOD FOR PRODUCING THE SAME, AND LITHIUM ION BATTERY
First Claim
1. A negative electrode for a lithium ion battery comprisinga negative electrode current collector,a plurality of columns formed so as to be spaced apart from each other on a surface of the negative electrode current collector, anda coating layer coating an entire surface of each of the plurality of columns, wherein:
- the columns include a negative electrode active material comprising either one of silicon and tin, and further include lithium absorbed thereinto; and
the coating layer contains at least one of lithium carbonate and lithium fluoride.
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Accused Products
Abstract
A negative electrode 10 for a lithium ion battery of the present invention includes a negative electrode current collector 11, protrusions 13 formed so as to be spaced apart from each other on a surface of the negative electrode current collector 11, columns 12 supported on the protrusions 13 one by one, and a coating layer 15 coating a surface of each of the columns 12. The columns 12 include a negative electrode active material including either one of silicon and tin, and further include lithium absorbed thereinto. The coating layer 15 contains at least one of lithium carbonate and lithium fluoride and is formed by exposing the columns 12 to an atmosphere with a dew point temperature of −60° C. or higher and 0° C. or lower.
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Citations
18 Claims
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1. A negative electrode for a lithium ion battery comprising
a negative electrode current collector, a plurality of columns formed so as to be spaced apart from each other on a surface of the negative electrode current collector, and a coating layer coating an entire surface of each of the plurality of columns, wherein: -
the columns include a negative electrode active material comprising either one of silicon and tin, and further include lithium absorbed thereinto; and the coating layer contains at least one of lithium carbonate and lithium fluoride. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for producing a negative electrode for a lithium ion battery, the method comprising the steps of:
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forming a plurality of columns so as to be spaced apart from each other on a surface of a negative electrode current collector, the columns including a negative electrode active material comprising either one of silicon and tin; allowing lithium to be absorbed into the plurality of columns; and allowing the columns with lithium absorbed thereinto to be exposed to an atmosphere with a dew point temperature of −
60°
C. or higher and 0°
C. or lower, thereby to form a coating layer containing lithium carbonate on surfaces of the columns. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A lithium ion battery comprising:
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a negative electrode including a negative electrode current collector, a plurality of columns formed so as to be spaced apart from each other on a surface of the negative electrode current collector, and a coating layer coating a surface of each of the plurality of columns; a positive electrode including a positive electrode active material capable of absorbing and desorbing lithium; a separator insulating the negative electrode and the positive electrode from each other; and a non-aqueous electrolyte;
wherein;the columns include a negative electrode active material comprising either one of silicon and tin, and further include lithium absorbed thereinto; and the coating layer contains at least one of lithium carbonate and lithium fluoride. - View Dependent Claims (18)
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Specification