Unlock instant, AI-driven research and patent intelligence for your innovation.
Preparation method for anode material
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A cathode material, high temperature technology, applied in battery electrodes, structural parts, electrical components, etc., can solve problems such as insufficient sintering process and local material oxygen deficiency
Active Publication Date: 2013-03-20
BYD CO LTD
View PDF2 Cites 0 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
[0006] The technical problem to be solved by the present invention is: in the prior art, the sintering process is insufficient, and the phenomenon of oxygen deficiency inside the local material; thereby providing a kind of sufficient sintering, the positive electrode material preparation method with excellent overall performance of the positive electrode material
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Examples
Experimental program
Comparison scheme
Effect test
preparation example Construction
[0012] A method for preparing a positive electrode material, which includes: mixing a positive electrode material precursor with a lithium source and a high-temperature inert expansion agent, then sintering at a high temperature in an oxygen-containing atmosphere, and then separating and removing the high-temperature inert expansion agent;
[0013] The general formula of the positive electrode material precursor is M a x b (OH) 2 , wherein, 0.8≤a≤1, 0≤b≤0.2, M is selected from one or more of Ni, Mn, Co, X is a metaldoping element, and X is selected from Fe, Al, Mg, Cr, Sr, One or more of Ti or rare earth elements;
[0014] The melting start temperature of the high-temperature inert expansion agent is greater than 800°C, and the volume ratio of the high-temperature inert expansion agent at 700°C to that at 25°C is greater than 2.
[0015] Wherein, the positive electrode material precursor is the hydroxide corresponding to the positive electrode material to be prepared. Thi...
Embodiment 1
[0037] Cathode material precursor: Ni 0.8 co 0.2 (OH) 2 , with an average particle size of 15 μm
[0039] High-temperature inert expansion agent: Jiangsu Risheng Technology Co., Ltd., type VII expansion joint, its volume ratio at 700°C and 25°C is 3:1, and its average particle size at room temperature is 0.5mm
[0040] Add 92.73Kg of positive electrode material precursor, 25.92kg of lithium source, and 24kg of high-temperature inert expansion agent into the planetary ball mill, and then add 80kg of absolute ethanol to it, control the speed at 5rad / s, and ball mill for 2.5h.
[0041] The above-mentioned ball-milled materials are sent into the sintering furnace, and oxygen is introduced to keep the oxygen partial pressure at 0.06Pa. Sintering at a constant temperature of 500°C for 4h, and then sintering at a constant temperature of 750°C for 16h.
[0042] The sintered product is cooled to room tem...
Embodiment 2
[0044] The difference from Example 1 is that the volume ratio of the high-temperature inert expansion agent at 700°C to 25°C is 2:1, and the other parts are the same as in Example 1. The obtained positive electrode material is denoted as A2.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More
PUM
Login to View More
Abstract
The invention belongs to the technical field of lithiumion batteries and particularly discloses a preparation method for an anode material. The method comprises the steps of: mixing anode material precursors with a lithium source and high-temperature inert expanding agent, then sintering the mixture at high temperature under an oxygen-containing atmosphere and finally removing the high-temperature inert expanding agent. The melting starting temperature of the high-temperature inert expanding agent is higher than 800 DEG C. The ratio of the volume of the high-temperature inert expanding agentat 700 DEG C to the volume of the high-temperature inert expanding agent at 25 DEG C is larger than 2. The method disclosed by the invention effectively eliminates the problem of partial oxygen deficiency of the material caused by material agglomeration during sintering and thereby improves the specific capacity and the cycling performance of the anode material.
Description
technical field [0001] The invention belongs to the technical field of lithiumion batteries, and in particular relates to a preparation method of a positive electrode material. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high specific energy, light weight, small size, long cycle life, no memory effect, fast charging and discharging, and no pollution, and are widely used in various electronic products. Cathode material is an important part of lithium-ion batteries, and its performance plays a decisive role in the performance of lithium-ion batteries. The most commonly used positive electrode materials are nickelmanganesecobalt series positive electrode materials. [0003] In the prior art, the preparation methods of nickel-manganese-cobalt series positive electrode materials for lithium-ion batteries are usually: high-temperature solid-phase synthesis method, precipitation method, sol-gel method, spray drying method, et...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to View More 
Login to View More