Pre-lithiation method of silicon negative electrode and assembling method of lithium ion battery

The invention relates to the field of lithium ion batteries, and discloses a pre-lithiation method of a silicon negative electrode and an assembling method of a lithium ion battery. The pre-lithiation treatment of the silicon negative electrode plate is realized by directly contacting the metal lithium plate with the silicon negative electrode plate under the infiltration of the electrolyte, and the pre-lithiation degree is controlled by controlling the contact time. According to the invention, simple and convenient pre-lithiation treatment can be carried out on the silicon negative electrode piece, impurities are not introduced, the original morphology of silicon negative electrode active particles is preserved, the internal resistance of the battery is reduced, and the first coulombic efficiency is obviously improved; therefore, better rate capability and cycle performance are obtained. 本申请涉及锂离子电池领域，公开了一种硅负极的预锂化方法以及锂离子电池的组装方法。本申请通过让金属锂片与硅负极极片在电解液的浸润下直接接触，来实现对硅负极极片的预锂化处理，并通过控制接触时间来控制预锂化的程度。通过本申请可以实现对硅负极极片进行简