Anode materials for lithium ion batteries and methods of making and using same
摘要
說明書
A slurry comprising the silicon alloy (coated and uncoated) and lithium polyacrylate (LiPAA) with a 91/9 weight ratio was prepared by placing 1.80 g of a 10% aqueous solution of 250,000 g/mol molecular weight LiPAA and 1.82 g silicon alloy. The slurry was made using a MAZERUSTAR mixer. The mixing time was 12 or 18 minutes. The resulting slurry was then coated onto a 15 μm copper foil using a coating bar with a 0.003″ gap and dried under vacuum at 120° C. for 2 h. Coin cell electrodes were then punched from this foil. Electrochemical 2325 coin cells were made with the silicon alloy electrodes versus a lithium foil counter/reference electrode and electrolyte solution (as described in Table 1).
Electrode performance for uncoated (neat) silicon alloy electrodes prepared as described above are tabulated in Tables 15-18 as Comparative Examples 1, 2, 3, and 4 (CE-1-4) for silicon alloys B, C, D, and E, respectively. Electrode performance for metal based material coated silicon alloy electrodes are also tabulated in Tables 15-18 and are labeled with the prefix E added to the example name of the coated silicon alloy used. For example, an electrode prepared using metal based materials coated silicon alloy E-19, would be referred to as EE-19 after it has been incorporated into an electrode.
Preparation of Composite Electrodes
The following procedures were used to prepare metal based material coated silicon alloy electrode compositions.
