Negative electrode material for non-aqueous liquid electrolyte secondary cell and non-aqueous liquid electrolyte secondary cell employing same
First Claim
1. A negative electrode material for use in a non-aqueous liquid electrolyte secondary cell comprising a sintered and carbonized plant origin high molecular weight material selected from the group consisting of coffee beans, tea leaves, cane sugar, corns, fruits, straws of cereals and husks of cereals, said material further comprising a sum total of 0.2 to 20 wt % of at least one metal element selected from phosphorus and sulphur and having a diffraction peak between 30°
- and 32°
of the 2θ
diffraction angle in the X-ray (CuKα
) powder diffraction pattern.
1 Assignment
0 Petitions
Accused Products
Abstract
A negative electrode material for a secondary cell for a non-aqueous liquid electrolyte for realizing a high charging/discharging capacity and a high discharging efficiency, a method for producing such material and a non-aqueous liquid electrolyte secondary cell employing such material. The negative electrode material contains at least one carbonaceous material selected from the group consisting of coffee beans, tea leaves, cane sugar, corns, fruits, straws of cereals and husks of cereals, a carbonaceous material derived from a plant-origin high molecular material containing a sum total of 0.2 to 20 wt % of metal elements, phosphorus and sulphur calculated as elements or a carbonaceous material having a diffraction peak between 30° and 32° of the 2θ diffraction angle in the X-ray (CuKα) powder diffraction pattern. For producing the negative electrode material, at least one carbonaceous material selected from the group consisting of coffee beans, tea leaves, cane sugar, corns, fruits, straws of cereals and husks of cereals, or crystalline or fibrous cellulose admixed with at least one of metal elements, phosphorus or sulphur, is sintered for carbonization. The negative electrode material is used for a non-aqueous liquid electrolyte secondary cell having a positive electrode formed of a lithium compound oxide and a negative electrode formed of a carbonaceous negative electrode material capable of doping and dedoping lithium ions as an active negative electrode material.
-
Citations
15 Claims
-
1. A negative electrode material for use in a non-aqueous liquid electrolyte secondary cell comprising a sintered and carbonized plant origin high molecular weight material selected from the group consisting of coffee beans, tea leaves, cane sugar, corns, fruits, straws of cereals and husks of cereals, said material further comprising a sum total of 0.2 to 20 wt % of at least one metal element selected from phosphorus and sulphur and having a diffraction peak between 30°
- and 32°
of the 2θ
diffraction angle in the X-ray (CuKα
) powder diffraction pattern. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
- and 32°
Specification