TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Cell: In the electrochemical cell, the moderator layer includes a form of lithium. The moderator layer includes Li4+xTi5O12. The positive electrode includes a form of sulfur. The moderator layer includes Li4+xTi5O12. Alternatively, the electrochemical cell comprises: a negative electrode including a form of lithium; a positive electrode spaced apart from the negative electrode; a separator positioned between the negative electrode and the positive electrode; and a layer of material including Li4+xTi5O12 and positioned between the negative electrode and the separator. Alternatively, the electrochemical cell comprises: a negative electrode including a form of lithium; a positive electrode spaced apart from the negative electrode; a separator positioned between the negative electrode and the positive electrode; and an electronically insulating moderator layer positioned between the negative electrode and the separator. The moderator layer includes a form of lithium. The moderator layer includes Li4+xTi5O12. The positive electrode includes a form of sulfur. The moderator layer includes Li4+xTi5O12. Alternatively, the electrochemical cell comprises: a negative electrode including a form of lithium; a positive electrode spaced apart from the negative electrode; a separator positioned between the negative electrode and the positive electrode; and a layer of material including Li4+xTi5O12 and positioned between the negative electrode and the separator. The positive electrode includes a form of sulfur. It also comprises: a negative electrode including a form of lithium; a positive electrode spaced apart from the negative electrode; a separator positioned between the negative electrode and the positive electrode; and a moderator layer positioned between the negative electrode and the separator. The moderator layer includes a form of lithium. The moderator layer includes Li4+xTi5O12. The positive electrode includes a form of sulfur. The moderator layer includes Li4+xTi5O12.