| 摘要 |
A high energy density lithium ion battery, the materials system therefor being high-voltage solid lithium cobalt oxide as the positive electrode, high-voltage solid and high-capacity modified natural graphite as the negative electrode, and graphene as an electrically conductive additive. In the present invention, the use of a high gram specific capacity, high-voltage solid positive and negative electrode materials system increases the amount of active materials per unit volume and the volumetric energy density of the battery. The use of highly electrically conductive graphene as an electrically conductive additive allows for avoiding the need to use of a large amount of a conventional electrically conductive agent and thereby reduces disadvantages in respect of the ratio of the active materials of the positive and negative electrodes, which further increases the volumetric energy density of the battery. The use of an electrolyte not containing a PC solvent prevents the PC from eroding the natural graphite, ensuring the cyclical stability of the battery. The present invention involves a simple process and produces a high-performing lithium battery having a volumetric energy density 30% to 50% higher than that of ordinary lithium batteries. |
