Lithium ion battery

Patent metadata

Field	Value
Publication number	US-9525174-B2
Application number	US-201313870983-A
Country	US
Kind code	B2
Filing date	Apr 26, 2013
Priority date	Dec 27, 2012
Publication date	Dec 20, 2016
Grant date	Dec 20, 2016

Abstract

A lithium ion battery includes a cathode, an anode, and an electrolyte sandwiched between the cathode and the anode. The cathode includes a cathode active material. The anode is spaced from the cathode. The cathode active material includes a sulfur grafted poly(pyridinopyridine). The sulfur grafted poly(pyridinopyridine) includes a poly(pyridinopyridine) matrix and sulfur dispersed in the poly(pyridinopyridine) matrix. The sulfur includes a number of poly-sulfur groups or a number of elemental sulfur particles dispersed in the poly(pyridinopyridine) matrix. The electrolyte is a gel electrolyte.

First claim

What is claimed is:

1. A lithium ion battery comprising:
a cathode comprising a cathode active material;
an anode spaced from the cathode; and
an electrolyte located between the cathode and the anode;
wherein the cathode active material is a sulfur grafted poly(pyridinopyridine) consisting of a poly(pyridinopyridine) matrix and a plurality of sulfur molecules dispersed in the poly(pyridinopyridine) matrix, and a mass percentage of the plurality of sulfur molecules in the poly(pyridinopyridine) matrix is equal to or smaller than 41%; the electrolyte is a gel electrolyte consisting of a polymer substrate defining a plurality of pores, an organic solvent, a metal lithium salt dissolved in the organic solvent, and an inorganic filler dispersed in the polymer substrate, and the organic solvent with the metal lithium salt dissolved therein fills the plurality of pores of the polymer substrate; and a material of the polymer substrate is copolymer of vinylidene fluoride-hexafluoropropylene, a material of the metal lithium salt is LiPF 6 , the organic solvent is made of ethylene carbonate and diethyl carbonate with a same volume, and the inorganic filler consists of a plurality of Al 2 O 3 nanoparticles.

2. The lithium ion battery of claim 1 , wherein a molar concentration of the organic solvent with the metal lithium salt dissolved therein is in a range from about 0.5 mol/L to about 3 mol/L.

Assignees

• Univ Tsinghua
• Hon Hai Prec Ind Co Ltd

Inventors

• Wang Li
• He xiang-ming
• Li Jian-Jun
• Gao Jian

Classifications

• Y02E60/122

  Cross-Sectional Technologies · mapped topic

• H01M4/382

  Lithium (H01M4/405 takes precedence) · CPC title

• H01M4/608 Primary

  containing heterocyclic rings · CPC title

• H01M4/587

  for inserting or intercalating light metals · CPC title

• H01M10/0565

  Polymeric materials, e.g. gel-type or solid-type · CPC title