High-energy-density lithium ion power battery

Abstract

The invention discloses a high-energy-density lithium ion power battery, and belongs to the technical field of manufacturing of lithium ion batteries. The high-energy-density lithium ion power batteryis formed by assembling a positive electrode plate, a negative electrode plate, a diaphragm, an electrolyte solution and an external package; the positive electrode plate is composed of a positive electrode current collector and a positive electrode slurry coating the positive electrode current collector, the positive electrode slurry is composed of a positive electrode active substance, a positive electrode conductive agent and a positive electrode binder, and the positive electrode active substance is cobalt nickel lithium manganate; the negative electrode plate is composed of a negative electrode current collector and a negative electrode slurry coating the negative electrode current collector, the negative electrode slurry is composed of a negative electrode active substance, a negative electrode conductive agent and a negative electrode binder, and the negative electrode active substance is a mixture of a silicon-carbon oxide material and a silicon carbon material, and the negative electrode binder is polyacrylic acid; the electrolyte solution is composed of lithium hexafluorophosphate, ethylene carbonate, ethyl methyl carbonate, fluoroethylene carbonate, vinylene carbonate and difluorosulfonamide lithium. The energy density of the battery is guaranteed, the cycle performance of the battery is improved, and the requirements of the power battery on the cycle life are met.

Description

technical field [0001] The invention relates to the technical field of manufacturing lithium-ion batteries, in particular to a lithium-ion power battery with high energy density. Background technique [0002] Lithium-ion battery is a secondary battery that relies on the migration of lithium ions between the positive and negative electrodes. Lithium-ion battery has a high energy density and is a high-capacity and efficient secondary battery. With the rapid development of electronic technology, electronic and power products are becoming more and more miniaturized and lightweight, and require faster charging speeds and can withstand high power, all of which put forward more stringent requirements for the performance of lithium-ion batteries Lithium-ion batteries are required to have higher energy density and power density, but a bottleneck in the development of high-energy-density lithium-ion batteries is the use of high-energy-density positive and negative electrode materials ...

AI Technical Summary

Problems solved by technology

The volume expansion of the silicon-carbon negative electrode is larger than that of silicon oxide carbon, so the cycle performance is relatively poor. Although the cycle performance of the silicon oxide carbon negative electrode is relatively good, due to more side reactions between the lithium extracted from the positive electrode and silicon oxide, it is seriously consumed. Lithium ions are used, resulting in low initial efficiency and low battery capacity, resulting in energy density that cannot meet the requirements