Positive electrode of lithium ion battery

Abstract

The invention discloses a positive electrode of a lithium ion battery. The positive electrode comprises a conductive substrate and positive paste, wherein the positive paste is coated on the conductive substrate and is formed by the mixing of a conductive agent, an active material and a binding agent, and the conductive agent is a three-dimensional conductive network formed by a zero-dimensional nanometer carbon substance with conductivity, a one-dimensional nanometer carbon substance with conductivity and a second-dimensional nanometer carbon substance with conductivity. In the positive electrode of the lithium ion battery, disclosed by the invention, three different-dimensional nano carbon conductive agents are adopted and mixed, on one hand, the nanoscale carbon conductive agents are beneficial for embedment and escapement of lithium ions, and on the other hand, conductive agents in three dimensions are mixed to form the three-dimensional conductive network, the difficulty of low conductivity of a pole plate brought by the conductive agents is overcome, the electrochemical impedance of the positive electrode is reduced, the conductivity of the pole plate is improved, and the electrochemical performance of the positive electrode is effectively improved.

Description

technical field [0001] The invention relates to a positive electrode of a lithium ion battery, belonging to the technical field of lithium ion batteries. Background technique [0002] In recent years, problems such as serious environmental pollution and energy scarcity have plagued human life. In the past two years, domestic smog has become increasingly serious, directly affecting the health of the people and the development of the domestic economy. One of the causes of smog is vehicle exhaust emissions. Therefore, the state has issued a number of policies to support the development of new energy vehicles. As the main power source of new energy vehicles, lithium-ion batteries have become the focus of attention. As a power battery for large vehicles, lithium-ion batteries cannot meet the requirements in terms of specific energy, cycle life, safety and other aspects. The key factor to solve this problem is not only the development and production of battery materials, but also...

AI Technical Summary

Problems solved by technology

RosalindJ.Gummow et al. selected Lil.25(3)Ni0.17(1)Mn0.61(1)O2 as the active material, and the conductive agent was superconducting carbon black. The capacity is 255mAh / g, but the discharge specific capacity in the second week decays to 225mAh / g (Journal of The Electrochemical Society, 160(10)A1856-A1862(2013))

The formulations of the conductive agents in these disclosed battery designs are all a simple mixture of one or two or three conductive agents, and the performance of the battery is low. One of the influencing factors is the low conductivity of the pole piece.

Images