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A kind of preparation method of palm oil residue-based lithium battery negative electrode material
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A technology of oil residue-based lithium and negative electrode materials, which is applied in the preparation/purification of carbon, negative electrodes, battery electrodes, etc., can solve the problems of poor low-temperature performance and rate performance, and achieve good low-temperature performance, controllable cost, and high composition single effect
Active Publication Date: 2022-03-04
JIANGSU PURESTAR EP TECH CO LTD
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At present, artificial graphite is commonly used. Artificial graphite has the advantages of good cycle performance, but its low temperature performance and rate performance are not good.
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[0017] A preparation method of a palm oil residue-based lithium battery negative electrode material, comprising the following steps:
[0018] 1) Select palm oil residue as raw material, and carry out carbonization treatment at a high temperature of 900-1200°C under an inert gas atmosphere until the oxygen content in the palm oil residue does not exceed 4%, to obtain a carbonized material, wherein the selected palm oil residue , with a cellulose content of not less than 50% and an ash content of not more than 1%;
[0019] 2) Pickling the carbonized material obtained in step 1), and controlling the pickling concentration between 2% and 8%;
[0020] 3) Grinding the carbonized material treated in step 2) to a particle size of 4-15 μm, and performing spheroidization treatment;
[0021] 4) Coating the carbonized material obtained in step 3) with asphalt, wherein the mass ratio of the asphalt to the carbonized material is 1:10-1:20;
[0022] 5) The carbonized material coated in ste...
Embodiment 1
[0025] A preparation method of palm oil residue-based lithium battery negative electrode material, comprising the following steps:
[0026] 1) Select palm oil residue as raw material, under inert gas atmosphere, carry out carbonization treatment at a high temperature of 900°C until the oxygen content in palm oil residue does not exceed 4%, to obtain carbonized material, wherein, the selected palm oil residue, its The cellulose content is not less than 50%, and the ash content is not more than 1%;
[0027] 2) Pickling the carbonized material obtained in step 1), the pickling adopts hydrochloric acid with a concentration of 2%;
[0028] 3) Grinding the carbonized material treated in step 2) to a particle size of 4-15 μm, and performing spheroidization treatment;
[0029] 4) Coating the carbonized material obtained in step 3) with asphalt, wherein the mass ratio of the asphalt to the carbonized material is 1:10, and the ash impurity content in the asphalt is lower than 0.1%;
...
Embodiment 2
[0033] The difference between this embodiment and embodiment 1 is that in step 1), the carbonization treatment is carried out at a temperature of 1000° C. under an inert gas atmosphere.
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Abstract
The invention discloses a preparation method of a palm oil residue-based lithium battery negative electrode material, comprising the following steps: 1) selecting palm oil residue as a raw material, and carrying out carbonization treatment at a high temperature of 900-1200°C in the palm oil residue under an inert gas atmosphere The oxygen content of the carbonized material does not exceed 4%, and the carbonized material is obtained; 2) Pickling treatment, the pickling concentration is controlled between 2%-8%; 3) The carbonized material treated in step 2) is crushed to a particle size of 4-15μm, and carry out spheroidization treatment; 4) Coat the carbonized material obtained in step 3) with pitch; 5) Put the carbonized material coated in step 4) into the kiln for high-temperature calcination; 6) The material after the calcining treatment in step 5) is ball milled and sieved. The raw material components selected by the preparation method are single, and the product structure is controllable. The lithium battery using the negative electrode material has strong pulse discharge capability, low DC internal resistance, and good low-temperature performance.
Description
technical field [0001] The invention relates to the technical field of preparation of lithium battery negative electrode materials, in particular to a preparation method of palm oil residue-based lithium battery negative electrode materials. Background technique [0002] Lithium-ion batteries are popular in energy storage devices due to their long cycle life, high operating voltage, and high energy density. In recent years, with the development of new energy vehicles, higher requirements have been put forward for lithium-ion batteries: Li+ must have a high dispersion rate in the negative electrode material, good reaction reversibility, high conductivity, and compatibility with the electrolyte it is good. At present, artificial graphite is commonly used. Artificial graphite has the advantage of good cycle performance, but its low temperature performance and rate performance are not good. In this way, preparing a lithium battery negative electrode material with high capacity...
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