Method for rapid synthesis of multi-element layered positive material of lithium-ion battery
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A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, electrical components, circuits, etc., can solve problems such as difficult to accurately control the operation process, difficult to industrialize production, complex synthesis process, etc., to reduce energy consumption and improve material performance , the effect of rapid heating
Inactive Publication Date: 2013-01-02
GUILIN UNIVERSITY OF TECHNOLOGY
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Although the liquid-phase synthesis method can realize the uniform mixing of raw materials at the molecular level and the synthesis temperature is low, the synthesis process is complex, the operation process is difficult to accurately control, the output is low, the equipment is complex, and it is difficult to realize industrial production
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Embodiment 1
[0018] Rapid synthesis of binary layered cathode material LiNi for lithium ion batteries using lithium acetate, nickel nitrate and manganese acetate as raw materials 1 / 2 mn 1 / 2 o 2 .
[0019] (1) According to n(Li):n(Ni):n(Mn) (molar ratio) = 1.1:0.5:0.5, accurately weigh lithium acetate, nickel nitrate and manganese acetate, and put them into corundum crucibles.
[0020] (2) Heat the crucible containing the raw materials prepared in step (1) on an electric furnace to melt the raw materials to form a uniform liquid.
[0021] (3) Move the crucible containing the liquid obtained in step (2) into an electric furnace heated to 500°C and keep the temperature constant to make it burn.
[0022] (4) Collect the reaction product obtained in step (3), grind it, pass through a 100-mesh sieve, and press it into a disc under a pressure of 15 MPa with a tablet machine.
[0023] (5) Place the wafer obtained in step (4) in a microwave oven at 900°C for 120 minutes, and then cool in the ov...
Embodiment 2
[0027] Rapid synthesis of ternary layered cathode material LiNi for lithium ion batteries from lithium acetate, nickel nitrate, cobalt nitrate and manganese acetate as raw materials 1 / 3 co 1 / 3 mn 1 / 3 o 2 .
[0028] (1) Accurately weigh lithium acetate, nickel nitrate, cobalt nitrate and manganese acetate according to n(Li):n(Ni):n(Co):n(Mn) (molar ratio)=1.1:0.33:0.33:0.33, into a corundum crucible.
[0029] (2) Heat the crucible containing the raw materials prepared in step (1) on an electric furnace to melt the raw materials to form a uniform liquid.
[0030] (3) Move the crucible containing the liquid obtained in step (2) into an electric furnace heated to 500°C and keep the temperature constant to make it burn.
[0031] (4) Collect the reaction product obtained in step (3), grind it, pass through a 100-mesh sieve, and press it into a disc under a pressure of 15 MPa with a tablet machine.
[0032] (5) Place the wafer obtained in step (4) in a microwave oven at 900°C f...
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Abstract
The invention discloses a method for rapid synthesis of a multi-element layered positive material of a lithium-ion battery. The method comprises the following steps of: adopting lithium acetate as a lithium source, adopts nitrate or / and acetate of Ni, Co, Mn, Fe and Cr with the melting point of being lower than 200 DEG C as a transition metal source, weighing materials accurately according to the chemical metering ratio of target products, and putting the materials into a corundum crucible (the target products are multi-element positive materials LiMO2 with layered structures, and M is two or more in Ni, Co, Mn, Fe and Cr); heating the materials in an electric furnace or water bath, enabling the materials to be melted to form uniform liquid, then moving the liquid into the constant-temperature electric furnace with the temperature of being 400-600 DEG C, and enabling the liquid to generate combustion reaction; carrying out collection, grinding and 100-mesh sieving on combustion reaction products, pressing into round pieces, putting into a microwave oven, insulating for 5-200 minutes at the temperature of 600-1000 DEG C, and then cooling along with the furnace; and finally, taking out the round pieces, and carrying out grinding and 300-mesh sieving to obtain a target product. The method disclosed by the invention has the advantages that water is not needed, the energy and the time are saved, the process is simple, the operation is easy, and the synthesized multi-element layered positive material has good electrochemical property.
Description
technical field [0001] The invention relates to a method for synthesizing positive electrode materials of lithium ion batteries, in particular to a method for rapidly synthesizing multi-layered positive electrode materials. Background technique [0002] Due to the advantages of easy synthesis, stable performance and high capacity, lithium cobalt oxide is the first and most used positive electrode material for commercial lithium-ion batteries. However, the cobalt required for its synthesis has disadvantages such as lack of resources, high price, and high toxicity. The development of new positive electrode materials with no cobalt or less cobalt has become one of the important development directions of positive electrode materials for lithium-ion batteries. [0003] Multilayer layered cathode materials such as LiNi 1 / 2 mn 1 / 2 o 2 、LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 and xLi 2 MnO 3 -(1-x)LiMO 2 (M is one or more of Ni, Co, Mn), etc., because of its high discharge specific cap...
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