Solid electrolyte and preparation method thereof, positive electrode material and lithium ion battery

• Main Authors: YANG FANGFANG, LI LIFEI, HUANG JIAN, OUYANG ZHIPENG, ZHOU LONGJIE
• Format: Patent
• Language: Chinese; English
• Published: 10.05.2024
• Subjects: ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAININGELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN,SULFUR, SELENIUM OR TELLURIUM; BASIC ELECTRIC ELEMENTS; CHEMISTRY; ELECTRICITY; HETEROCYCLIC COMPOUNDS; METALLURGY; ORGANIC CHEMISTRY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention provides a solid electrolyte and a preparation method thereof, a positive electrode material and a lithium ion battery. The solid electrolyte is obtained by modifying a solid electrolyte matrix with a functional compound shown as a formula A. The functional compound can convert residual alkali on the surface of the oxide solid electrolyte matrix into a favorable component, and benzothiophene groups are grafted and complexed on the surface of the functional compound, so that a metal-hydroxyl active center on the surface of the oxide solid electrolyte is thoroughly inactivated. Through research, when the positive pole piece prepared from the solid electrolyte provided by the invention is used for preparing the lithium ion battery, the lithium ion battery has excellent rate capability, high-temperature cycle performance and safety performance. 本发明提供了一种固态电解质及其制备方法、正极材料和锂离子电池。该固态电解质由式A所示的功能化合物对固态电解质基体改性后得到，该功能化合物可以将氧化物固态电解质基体表面的残碱转化为有利组分，在其表面接枝络合苯并噻吩基团，使氧化物固态电解质表面的金属-羟基活性中心彻底失活。经研究，采用本发明提供的固态电解质制备的正极