Silicon-containing particle, negative-electrode material for use in non-aqueous electrolyte secondary battery, and non-aqueous electrolyte secondary battery

Abstract

A silicon-containing particle is provided for use as a negative-electrode active material of a non-aqueous electrolyte secondary battery, wherein a crystal grain size is 300 nm or less, the crystal grain size being obtained by a Scherrer method from a full width at half maximum of a diffraction line attributable to Si and near 2θ=28.4° in an x-ray diffraction pattern analysis, and a true density is more than 2.320 g/cm 3 and less than 3.500 g/cm 3 . Silicon-containing particles are provided for use as a negative-electrode active material of a non-aqueous electrolyte secondary battery that enable manufacture of a non-aqueous electrolyte secondary battery having an excellent cycle characteristics and a higher capacity compared with graphite types.

1 - 8 . (canceled) 
     
     
         9 . A silicon-containing particle for use as a negative-electrode active material of a non-aqueous electrolyte secondary battery, wherein
 a crystal grain size is 300 nm or less, the crystal grain size being obtained by a Scherrer method from a full width at half maximum of a diffraction line attributable to Si (111) and near 2θ=28.4° in an x-ray diffraction pattern analysis, and   a true density is more than 2.320 g/cm 3  and less than 3.500 g/cm 3 .   
     
     
         10 . The silicon-containing particle according to  claim 9 , wherein a volume median diameter D 50  of a particle size ranges from 1 μm to 20 μm. 
     
     
         11 . The silicon-containing particle according to  claim 9 , wherein a quotient of a volume median diameter D 50  of a particle size divided by the crystal grain size ranges from 1 to 5000. 
     
     
         12 . The silicon-containing particle according to  claim 9 , containing one or more elements selected from the group consisting of boron, aluminum, phosphorus, titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, zinc, arsenic, germanium, tin, antimony, indium, tantalum, tungsten, and gallium. 
     
     
         13 . The silicon-containing particle according to  claim 10 , containing one or more elements selected from the group consisting of boron, aluminum, phosphorus, titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, zinc, arsenic, germanium, tin, antimony, indium, tantalum, tungsten, and gallium. 
     
     
         14 . The silicon-containing particle according to  claim 11 , containing one or more elements selected from the group consisting of boron, aluminum, phosphorus, titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, zinc, arsenic, germanium, tin, antimony, indium, tantalum, tungsten, and gallium. 
     
     
         15 . A negative-electrode material for use in a non-aqueous electrolyte secondary battery, comprising silicon-containing particles according to  claim 9  as a negative-electrode active material of the non-aqueous electrolyte secondary battery. 
     
     
         16 . A negative-electrode material for use in a non-aqueous electrolyte secondary battery, comprising silicon-containing particles according to  claim 10  as a negative-electrode active material of the non-aqueous electrolyte secondary battery. 
     
     
         17 . A negative-electrode material for use in a non-aqueous electrolyte secondary battery, comprising silicon-containing particles according to  claim 11  as a negative-electrode active material of the non-aqueous electrolyte secondary battery. 
     
     
         18 . A negative-electrode material for use in a non-aqueous electrolyte secondary battery, comprising silicon-containing particles according to  claim 12  as a negative-electrode active material of the non-aqueous electrolyte secondary battery. 
     
     
         19 . A negative-electrode material for use in a non-aqueous electrolyte secondary battery, comprising silicon-containing particles according to  claim 13  as a negative-electrode active material of the non-aqueous electrolyte secondary battery. 
     
     
         20 . A negative-electrode material for use in a non-aqueous electrolyte secondary battery, comprising silicon-containing particles according to  claim 14  as a negative-electrode active material of the non-aqueous electrolyte secondary battery. 
     
     
         21 . The negative-electrode material according to  claim 15 , further comprising graphite as a conductive agent. 
     
     
         22 . The negative-electrode material according to  claim 16 , further comprising graphite as a conductive agent. 
     
     
         23 . The negative-electrode material according to  claim 17 , further comprising graphite as a conductive agent. 
     
     
         24 . The negative-electrode material according to  claim 18 , further comprising graphite as a conductive agent. 
     
     
         25 . The negative-electrode material according to  claim 19 , further comprising graphite as a conductive agent. 
     
     
         26 . The negative-electrode material according to  claim 20 , further comprising graphite as a conductive agent. 
     
     
         27 . A non-aqueous electrolyte secondary battery, comprising:
 a negative-electrode molded body made of the negative-electrode material according to  claim 15 ;   a positive-electrode molded body;   a separator configured to separate the negative-electrode molded body from the positive-electrode molded body; and   a non-aqueous electrolyte.   
     
     
         28 . The non-aqueous electrolyte secondary battery according to  claim 27 , wherein the non-aqueous electrolyte contains lithium ions.