Negative electrode material for lithium ion batteries, lithium ion battery, method and apparatus for producing negative electrode for lithium ion batteries, and method and apparatus for producing negative electrode material for lithium ion batteries

• Main Authors: KANATANI YAYOI, HIGO TORU, KOBAYASHI HIKARU
• Format: Patent
• Language: Chinese; English
• Published: 15.02.2017
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

A negative electrode material for lithium ion batteries according to one embodiment of the present invention comprises silicon fine particles which are obtained by pulverizing crystalline silicon. A negative electrode material for lithium ion batteries according to another embodiment of the present invention is configured such that the intensity of a diffraction peak belonging to Si(111) around 2[theta]= 28.4 DEG of a plurality of silicon fine particles that are formed of crystalline silicon is higher than the intensities of other diffraction peaks as determined by X-ray diffraction measurement. A lithium ion battery, which is suppressed in change of the charge/discharge capacity even if charging and discharging are repeated, is able to be obtained by employing one of the above-described negative electrode materials.. 本发明的锂离子电池的负极材料具有将晶体硅粉碎而成的硅微粒。本发明的另锂离子电池的负极材料如下：利用X射线衍射可测得由晶体硅形成的多个硅微粒在2θ＝28.4°附近归属于Si(111)的衍射峰的强度，该强度大于其他衍射峰的强度。通过采用上述各种负极材料，能够得到种锂离子电池，即使反复对其充放电，充放电容量也难以发生变化。