▎ 摘　　要

NOVELTY - Preparing a micron silicon-graphene composite aerogel, comprises (1) adding a uniformly mixed graphene oxide solution, a micron silicon material dispersion liquid and water-soluble reducing agent dispersion C into the sealed reactor, (2) heating the closed reactor, and carrying out reduction and self-assembly on graphene oxide to obtain micron silicon-graphene composite hydrogel, and (3) performing low-temperature freezing treatment on the micron silicon-graphene composite hydrogel, and then drying by using a freeze dryer to obtain the final product. USE - The method is useful for preparing a micron silicon-graphene composite aerogel. ADVANTAGE - The aerogel: has high specific capacity and reduce the cost of micron silicon; can well relieve the expansion of the silicon volume; prevent the cathode from losing efficacy in the circulating process; can assist in realizing high rate performance and circulating performance by the graphene and conductive agent while fully exerting. DETAILED DESCRIPTION - Preparing a micron silicon-graphene composite aerogel, comprises (1) adding a uniformly mixed graphene oxide solution, a micron silicon material dispersion liquid and water-soluble reducing agent dispersion C into the sealed reactor, (2) heating the closed reactor, and carrying out reduction and self-assembly on graphene oxide to obtain micron silicon-graphene composite hydrogel, and (3) performing low-temperature freezing treatment on the micron silicon-graphene composite hydrogel, and then drying by using a freeze dryer to obtain the final product, where the micron silicon-graphene composite aerogel at least comprises a carbon element and a silicon element, The carbon element is mainly present in the form of graphene aerogel. The carbon element in the graphene aerogel form accounts for more than 96 wt.% of the total mass of the carbon element of the micron silicon-graphene composite aerogel. The silicon element exists in the form of micron silicon material. The silicon element at least partially covered in the form of graphene aerogel network, and the wrapped silicon element accounts for more than 95 wt.% of the total mass of the silicon element. The molar ratio of the silicon element to the carbon element is 1:2 to 2:1. INDEPENDENT CLAIMS are also included for: a electrode comprising a current collector layer and an active material coating disposed on the current collector layer, where the active material coating includes the micro silica-graphene composite aerogel, preferably, the electrode is a cathode. a preparing the electrode, comprising grinding the micron silicon-graphene composite aerogel prepared by the above method into micron silicon-graphene composite aerogel particles, and the mass ratio of micron silicon-graphene composite aerogel particles to the conductive agent to the binder, namely a: b: c, where 85≤a≤90, 5≤b≤7, 5≤c≤8, 5≤c≤8, a+b+c=100, (5) uniformly mixing the micron silicon-graphene composite aerogel particles, a conductive agent, a binder and a solvent to prepare slurry, coating the slurry on a continuous current collector layer, and then drying and rolling to obtain an electrode roll, (6) cutting the electrode roll according to the required size, and (7) packaging, sampling and delivering; and a battery comprising a anode, a cathode, a separator and an electrolyte, where the cathode is electrode.