Recent Solid State Battery Patent Applications Filed by China’s BYD Published
A number of patent publications have appeared this year on solid state batteries (SSB) filed by China’s battery and electric vehicle OEM- BYD. The company whose name means “Build Your Dream” is the largest manufacturer globally of rechargeable batteries. It has already seen 167 of its patent filings published in 2021, according to data from the European Patent Office online patent database – Espacenet. Two documents were identified using machine translation which describe some of the innovations on SSB which BYD have sought to patent. CN112242519 describes a core-shell cathode active material (CAM) which includes an oxide of titanium in the formulation. The CAM has desirable properties including operation at high voltage, good cycling and rate performance. CN112242557 describes an SSB with an electrolyte consisting of a mixture of lithium-sulphide and tin sulphide which results in better safety performance and higher energy density – necessary for increasing the driving range and performance in operation for instance in an electric passenger car.
SSB are widely anticipated to be employed in the next generation of lithium ion batteries (LIB) and it is not surprising to see BYD’s R&D approaches appearing in the patent literature this soon into 2021. There are many different types of solid state electrolyte technologies including (Na) Super Ionic CONductor, (NASICON), LIthium Super Ionic CONductor (LISICON), Lithium Phosphorus Oxy-Nitride (LiPON), lithium nitride (Li3N), sulfide, argyrodite, anti-perovskite, garnet, perovskite, and many others.
CN112242519 (A) – A positive electrode material and preparation method thereof, and a solid-state lithium battery
Applicant: BYD Co. Ltd.
Publication Date: 19th January 2021
Machine Translated Abstract:
The present invention provides a cathode material with a core-shell structure, the core is a cathode active material, the shell includes a lithium-containing transition metal oxide and Ti2O3, and the ionic conductivity of the lithium-containing transition metal oxide is higher than 10 − 8S·cm-1, the lithium-containing transition metal oxide can remove lithium to form an oxide under a voltage higher than 3.0V, and the electronic conductivity of the oxide is higher than 10-6S·cm-1. The invention also provides a preparation method of the positive electrode material and a solid lithium battery. The cathode material can construct a lithium ion transmission channel and an electron transmission channel at the same time, which greatly improves the capacity development, first-lap coulombic efficiency, cycle performance and high rate performance of solid-state lithium batteries. Use of this technology enables good safety performance and higher energy density.
CN112242557 A – A lithium-ion battery solid electrolyte and its preparation method and solid-state lithium-ion battery
Applicant: BYD Co. Ltd.
Publication Date: 19th January 2021
Machine Translated Abstract:
The present disclosure relates to a lithium ion battery solid electrolyte, a preparation method thereof, and a solid lithium ion battery. The electrolyte contains a substance with the chemical formula aLi2S-MS2·nH2O, where M is one or more of Si, Ge and Sn, and 1≤ n≤12, 1≤a≤2. The solid electrolyte of the present disclosure has good safety performance and higher energy density
