Nonaqueous electrolyte rechargeable battery, and negative electrode and material thereof
First Claim
1. A negative electrode material for a nonaqueous electrolyte rechargeable battery in the form of panicles comprising:
- at least on the surface thereof, a compound of the phase in which an element Z is present in Si in a non-equilibrium state,whereinthe compound contains Si, the element Z and another element M in the composition expressed by a general formula
SiZxMy,whereinthe element Z is C,the element Z has a dimension of less than or equal to 500 nm,x is from 0.05 to 0.90,the element M is one element or two or more elements selected from elements other than Si and the element Z, andy is a number from greater than 0 to 0.5 wherein y is not 0, andx+y is less than or equal to 1.
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Accused Products
Abstract
A negative electrode material for a nonaqueous electrolyte rechargeable battery that can stably and efficiently realize a high-performance nonaqueous electrolyte rechargeable battery in which a high discharge capacity, high charge/discharge efficiency at an initial stage and during charge/discharge cycles, and excellent charge/discharge cycle properties are provided as well as electrode expansion in volume after charge/discharge cycles is suppressed. The negative electrode material for a nonaqueous electrolyte rechargeable battery in the form of particles having, at least on the surface thereof, a compound of the phase in which an element Z is present in Si in a non-equilibrium state. The compound is expressed by the general formula SiZxMy, where Z represents C and/or N, M represents an element other than C and N, and when the concentration of the element Z in a compound SiaZp, where each of a and p is an integer, having a composition closest to that of Si and present in an equilibrium state is presumed to be 100 atomic percent, the concentration of the element Z in the compound SiZxMy is in the range of 10 to 95 atomic percent, and y is in the range of 0 to 0.5.
3 Citations
6 Claims
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1. A negative electrode material for a nonaqueous electrolyte rechargeable battery in the form of panicles comprising:
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at least on the surface thereof, a compound of the phase in which an element Z is present in Si in a non-equilibrium state, wherein the compound contains Si, the element Z and another element M in the composition expressed by a general formula
SiZxMy,wherein the element Z is C, the element Z has a dimension of less than or equal to 500 nm, x is from 0.05 to 0.90, the element M is one element or two or more elements selected from elements other than Si and the element Z, and y is a number from greater than 0 to 0.5 wherein y is not 0, and x+y is less than or equal to 1. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification