Lithium titanate-based chemical power supply

Abstract

The invention provides a lithium titanate-based chemical power supply which consists of an anode, a cathode, a diaphragm and an electrolyte and is characterized in that the anode and the cathode respectively consist of active substances and current collectors, wherein the cathode active substance is lithium titanate, the capacity of the anode active substance is excessive, and the capacity ratio of the anode active substance to the cathode active substance is between (1.1:1)-(4:1). The lithium titanate-based chemical power supply has the advantages of excellent large-magnification charging-discharging performance, long cycling life, high safety and good cycling performance, so that the chemical power supply has wider application field.

Description

technical field [0001] The invention relates to the field of chemical power sources, in particular to a lithium titanate-based chemical power source. Background technique [0002] Lithium titanate (Li 4 Ti 5 o 12 ) is a new type of anode material for lithium-ion batteries, and its biggest feature is "zero strain". The so-called "zero strain" means that the crystal lattice constant and volume change are very small when inserting or extracting lithium ions. In the charge and discharge cycle, this "zero strain" can avoid the structural damage caused by the back and forth expansion and contraction of the electrode material, thereby improving the cycle life of the electrode, reducing the specific capacity fading caused by the cycle, and also has very good durability. Overcharge and overdischarge characteristics; so lithium titanate is also an excellent battery material and anode material for hybrid supercapacitors. Theoretically speaking, lithium titanate can have a life of ...

AI Technical Summary

Problems solved by technology

Theoretically speaking, lithium titanate can have a life of more than 30,000 times, but due to the limitation of the cycle life of positive electrode materials and electrolyte technology, the cycle life of chemical power devices with lithium titanate as the negative electrode is far below 30,000 times, the highest Around 6000 times

[0003] The carbon material negative electrode lithium ion chemical power supply generally adopts the design method of excessive negative electrode positive limit capacity. This is because if the negative limit capacity of the positive electrode is excessive, the excess lithium ions of the positive electrode will be precipitated on the surface of the negative electrode, forming lithium dendrites, causing short circuit and other vicious ACCIDENT

Images