Multi-layer cathode with nickel gradient

A multi-layer cathode having a nickel gradient is provided that includes two or more layers having a nickel-containing transition metal oxide. The first layer may be disposed in direct contact with a current collector and may include active material particles having a relatively high stoichiometric nickel percentage. The second layer may be disposed directly between the first layer and a separator and may include active material particles having a relatively low stoichiometric nickel percentage. In some examples, active material particles included in the cathode may have a customized crystallinity. 提供了一种具有镍梯度的多层阴极，其包括具有含镍过渡金属氧化物的两个或多个层。第一层可被设置为直接接触集流体，并且可包括具有相对较高化学计量镍百分比的活性材料颗粒。第二层可被直接设置在第一层和分隔体之间，并且可包括具有相对较低化学计量镍百分比的活性材料颗粒。在一些示例中，包括在阴极中的活性材料颗粒可具有定制的结晶度。