| abstract |
The present invention discloses a composite comprising nanosilicon, a lithium-containing compound and a carbon coating or comprising nanosilicon, silicon oxide, a lithium-containing compound and a carbon coating. The method of the present invention comprises (1) a solid phase mixing of carbon-coated silicon oxide and a lithium source; and (2) a pre-lithium precursor obtained by step (1) is heat-treated in a vacuum or non-oxidizing atmosphere. And obtaining a complex. The method of the present invention is simple, requires little equipment, and is low in cost. The resulting composite has a stable structure and does not deteriorate in structure and properties even when stored for a long period of time. When a negative electrode material containing the composite is produced in a battery, it exhibits high delithiation capacity, high initial Coulomb efficiency, and good cycle performance, and has a charge capacity of 1920 mAh / g or more and a discharge capacity of 1768 mAh / g or more. The initial efficiency is 90.2% or more. |