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Preparation method for anode material
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A positive electrode material, high temperature technology, applied to battery electrodes, structural parts, electrical components, etc., can solve problems such as insufficient sintering process and local material oxygen deficiency
Active Publication Date: 2012-01-11
BYD CO LTD
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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 ...
Method used
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[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 metal doping 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
[0038] Lithium source: lithium hydroxide, the average particle size is 10μm
[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 t...
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.
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Abstract
The invention belongs to the technical field of lithium ion 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 lithium ion 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 nickel manganese cobalt 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
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