Multilayer nano-composite electrode for lithium ion battery and preparation method thereof
A lithium-ion battery and nanocomposite technology, which is applied in battery electrodes, nanotechnology for materials and surface science, nanotechnology, etc. problem, to achieve the effect of reducing irreversible capacity, increasing energy density, and reducing shedding
Pending Publication Date: 2017-04-26
SOUTH CHINA UNIV OF TECH
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The invention discloses a multilayer nano-composite electrode for a lithium ion battery and preparation method thereof. The multilayer nano-composite electrode is mainly composed of a copper current collector and multilayer active substances; the copper current collector is provided with a porous structure and a nano-needle structure; the multilayer active substances comprise a silicon layer and a carbon layer. The preparation method of the multilayer nano-composite electrode is as follows: (1) sintering of copper powder; (2) growing and reducing of copper oxide nanoneedle structure; (3) depositing of a silicon nanometer layer; and (4) cladding of the carbon nanometer layer. The multilayer nano-composite electrode disclosed by the invention can effectively limit the sharp change of the volume of silicon active substance in the charging/discharging process of the battery, thereby prolonging the cycle life of the battery; and meanwhile, the porous structure and the nano-needle structure of the current collector are directly and tightly contacted with the active substances, the use of each of the adhesive and the conductive additive is reduced, thereby facilitating the improvement of the reversible capacity, the coulombic efficiency, the cycle stability and other electrochemical properties of the battery.
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