NOVELTY - The method comprises executing charging and discharging operation on an electrochemical cell that comprises cell components including a cathode, an anode and a layer such as a separator or polymer electrolyte arranged between the cathode and the anode, detecting and localizing a damage and/or defect of a first material of the cell component, where the material is subjected to a first charging and discharging cycle, and removing parts of the damaged and/or defective first material from the cell component, as a result of which cell component is available.    USE - The method is useful for modifying an electrochemical cell that is useful as power supply for mobile information devices, tools and electrically powered automobiles and automobiles with hybrid drive and for stationary energy storage (all claimed), where the electrochemical cell includes a lithium-ion battery.    ADVANTAGE - The method allows modification of the electrochemical cell without any damage in an economical and energy efficient manner thus enhancing energy density and charge capacity of the electrochemical cell.    DETAILED DESCRIPTION - The method comprises executing charging and discharging operation on an electrochemical cell that comprises cell components including a cathode, an anode and a layer such as a separator or polymer electrolyte arranged between the cathode and the anode, detecting and localizing a damage and/or defect of a first material of the cell component, where the material is subjected to a first charging and discharging cycle, removing parts of the damaged and/or defective first material from the cell component, as a result of which cell component is available and has a first area (111) having the first material (121) and a second area (131) from which the damaged and/or defective material is removed, and incorporating a second material (141) in the second area of the cell component. The first material is firmly connected to the second material. The first and second materials include anode or a cathode material, a separator material and/or an electrolyte material. The second material is introduced as a fluid replacement or as a substrate in the second area of the cellular component. The electrochemical cell further comprises a positive electrode and a negative electrode. A portion of the electrochemical cell is replaced by an exchange substrate after the charging and discharging operation. INDEPENDENT CLAIMS are included for:    (1) an electro chemical cell; and    (2) an exchanging substrate.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a cell component of an electrochemical cell.    First area (111)    First material (121)    Second area (131)    Second material. (141)