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A flexible battery is composed of a cell stack composed of multiple unit cells and an outer shell that seals the stack. Each unit cell is made up of a positive electrode, a negative electrode, and an electrolyte layer positioned between the negative electrode and the positive electrode. Flexible substrates for micro-components are frequently made of metal foils, polymer films, paper sheets, and rubber surfaces. Flexible substrates enable the development of battery products that bend and stretch, allowing for a wider range of battery ... more