Fast and reversible lithium storage in a wrinkled structure formed from Si nanoparticles during lithiation/delithiation cycling

► A wrinkled structure is formed during charge/discharge cycling of Si nanoparticles. ► The wrinkled structure exhibits high capacity as well as good rate performance. ► The wrinkled structure is retained for long cycles by restricting lithiation degree. ► Uniform carbon-coating of Si nanoparticles further enhances the performance.