Negative electrode material, battery and vehicle

Abstract

The invention discloses a negative electrode material, a battery and a vehicle. The negative electrode material comprises a first negative electrode active material, a second negative electrode activematerial, a third negative electrode active material, a first negative electrode conductive agent, a second negative electrode conductive agent, a third negative electrode conductive agent, a first negative electrode binder, a second negative electrode binder and a third negative electrode binder, wherein the first negative electrode active substance is a silicon-based negative electrode material, and the content of the first negative electrode active substance is 10-30% of the total mass of the negative electrode material. According to the negative electrode material, the active substance with high silicon content is adopted, so that the energy density can reach 320 W.h / kg or above, and meanwhile, through the optimization of other negative electrode material components, the performance,such as longer cycle life, etc., can be obtained.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular, the invention relates to negative electrode materials, batteries and vehicles. Background technique [0002] With the rapid development of new energy electric vehicles, the energy density requirements for lithium-ion secondary batteries are increasing. Improving the energy density of batteries will not only help increase the driving range of electric vehicles, but also significantly reduce the high cost problems currently encountered. The application of high-nickel positive electrode materials for lithium-ion batteries and the transformation of negative electrode materials from graphite to silicon-based materials are important measures to achieve the above goals. At present, most of the industry adopts the silicon-carbon composite route to improve the basic performance of silicon-based negative electrodes such as application level, cycleability, and rate characteristics to meet ...

AI Technical Summary

Problems solved by technology

The existing technology mostly uses nickel-cobalt-manganese ternary and silicon-based negative electrode material systems for battery development; however, the processing risks caused by the high residual alkali content of the positive electrode and the large expansion of the silicon negative electrode when lithium is intercalated are difficult to solve for a long time

Images