Non-uniform lithium ion battery negative electrode plate and lithium ion battery

Abstract

The invention relates to the technical field of lithium ion batteries, and particularly provides a non-uniform lithium ion battery negative electrode plate and a lithium ion battery. The non-uniform lithium ion battery negative electrode plate comprises a negative electrode current collector and a negative electrode active material layer attached to the surface of the negative electrode current collector; the negative electrode active material layer contains an alloy type negative electrode active material, the volume of which is changed in the lithiation and lithium removal processes, and thecontent of the alloy type negative electrode active material is gradually increased from the surface of the negative electrode current collector to the outside. The negative plate structure can effectively reduce the negative influence of huge volume change of the alloy type negative electrode active material on the battery performance in the lithiation and lithium removal processes, so that theelectrochemical performance of a lithium ion battery is improved. 本发明涉及锂离子电池技术领域，具体提供一种非均匀锂离子电池负极片、锂离子电池。所述非均匀锂离子电池负极片，包括负极集流体以及附着于所述负极集流体表面的负极活性材料层，所述负极活性材料层中含有在锂化和脱锂过程中体积发生变化的合金型负极活性材料，且自所述负极集流体表面向外，所述合金型负极活性材料的含量逐渐增多。本发明的负极片结构能够有效减轻锂化和脱锂过程中合金型负极活性材料巨大的体积变化对电池性能的负面影响，从而改善锂离子电池的电化学性能。