公开(公告)号：US20200083528A1

公开(公告)日：2020-03-12

申请号：US16562418

申请日：2019-09-05

Applicant: PETROCHINA COMPANY LIMITED

Inventor： Jianming LI ,  Xu JIN ,  Xiaoqi WANG ,  Liang SUN ,  Ling SU ,  Xiaodan LIU

IPC: H01M4/485 ,  H01M10/0525 ,  H01M10/054 ,  C01G23/00

Abstract: A linear hierarchical structure lithium titanate material, preparation and application thereof. The crystal phase of the lithium titanate material is a spinel-type crystal phase or a monoclinic crystal phase or a composite crystal phase thereof; the lithium titanate material is mainly composed of a linear hierarchical structure; the linear hierarchical structure has an aspect ratio larger than 10; and the surface components of the linear hierarchical structure are nanosheets. The long-axis of the linear structure facilitates the effective migration of electrons, and the sheet-like hierarchical structure facilitates the rapid intercalation and deintercalation process of lithium ions, sodium ions or potassium ions, and a large specific surface area facilitates the contact area between the electrolyte solution and the electrodes and reduces the current density, thus is excellent in a rapid charge-discharge performance of the battery.

公开(公告)号：US20200071185A1

公开(公告)日：2020-03-05

申请号：US16556211

申请日：2019-08-29

Applicant: PETROCHINA COMPANY LIMITED

Inventor： Jianming LI ,  Xu JIN ,  He LIU ,  Xiaodan LIU ,  Xiaoqi WANG ,  Liang SUN

IPC: C01G23/053 ,  C01G23/00 ,  B01J21/06 ,  B01J35/00 ,  H01M4/485

Abstract: A process for preparing a titanic acid salt, titanic acid, and titanium oxide having a controllable particle size and a hierarchical structure, wherein the process includes the steps of: preparing a titanium-containing peroxo-complex solution; adding a basic metal compound to the titanium-containing peroxo-complex solution to form a mixture solution; adding one of polyvinyl alcohol, hydroxypropyl methyl cellulose, and polyethylene glycol to the mixture solution to form a precursor dispersion; and subjecting the precursor dispersion to a solvothermal reaction to obtain the titanic acid salt having a hierarchical structure. The process for preparing a titanic acid salt, titanic acid, and titanium oxide having a controllable particle size and a hierarchical structure, can not only realize the regulation of morphology and particle diameter of constituent units in the hierarchical structure, but also can achieve the regulation of particle size in the hierarchical structure.

公开(公告)号：US20200071184A1

公开(公告)日：2020-03-05

申请号：US16556224

申请日：2019-08-29

Applicant: PETROCHINA COMPANY LIMITED

Inventor： Xu JIN ,  Jianming LI ,  He LIU ,  Hang JIAO ,  Xiaoqi WANG ,  Liang SUN ,  Xiaodan LIU

IPC: C01G23/00 ,  C01D15/00

Abstract: A preparation method of a nanotube hierarchically structured lithium titanate includes the steps of: S1. dispersing a titanium source into an aqueous solution containing lithium hydroxide and hydrogen peroxide and stirring to obtain a mixed solution; S2. subjecting the mixed solution obtained in step S1 to a reaction by heating to obtain a precursor having a nanowire-like structure; S3. subjecting the precursor having a nanowire-like structure obtained in step S2 to separation and drying; S4. subjecting the precursor having a nanowire-like structure after separation and drying to a low-temperature annealing treatment; S5. subjecting the precursor having a nanowire-like structure after the low-temperature annealing treatment to a liquid thermal reaction to obtain the nanotube hierarchically structured lithium titanate. The method includes a simple process and easily controllable process parameters, and may be easily scaled-up for industrial production.