Thick-electrode negative pole piece, preparation method thereof and lithium ion battery

The invention discloses a thick-electrode negative pole piece, a preparation method thereof and a lithium ion battery. The pole piece comprises a current collector and a negative active material layer arranged on at least one side surface of the current collector, wherein the negative active material layer comprises a nanotube conductive agent; the nanotube conductive agent and the negative electrode active material layer meet the relational expression: 0.3 < = H * S/(M * (L/D)) < = 5.1, and H is the thickness of the negative electrode active material layer; s is the cross sectional area of the nanotube conductive agent, and D is the outer diameter of the nanotube conductive agent; l is the length of the nanotube conductive agent; m is the mass fraction of the nanotube conductive agent in the negative electrode active material layer. According to the invention, the nanotube conductive agent is added into the negative pole piece, the hollow structure of the nanotube conductive agent can be utilized to enhance