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DOI: 10.1002/advs. 201500022 almost no capacity was delivered. In regard of this, the majority of previous studies deposited ALD layer onto the surface of electrode sheet instead of material powders so as to avoid the insulation between binder, conductive carbon, and cathode materials since the coating on electrodes did not break the contact between them.[14] This will certainly restrict the application of ALD because some ALD materials require high deposition temperature, under which the binder may be unstable. Therefore, searching for a coating material with good electron and lithium diffusion, whilst protecting the cathode material uniformly under high voltage is exceptionally important. Despite the versatile design of ALD, coating materials that are electrochemically active, ie, capable of accommodating Li+ within the voltage range of cathode materials are scarcely reported. With the electrochemically active …