Lithium battery hard carbon microsphere cathode material with core-shell structure and preparation method thereof
A core-shell structure and negative electrode material technology, applied in battery electrodes, structural parts, circuits, etc., can solve problems such as voltage hysteresis, large irreversible capacity for the first charge and discharge, etc., achieve high capacity, reduce equipment corrosion, and be easy to stabilize.
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Embodiment 1
[0037] A lithium battery hard carbon microsphere negative electrode material with a core-shell structure, characterized in that: the lithium battery hard carbon microsphere negative electrode material with a core-shell structure is made of starch-based hard carbon microspheres and a graphitized layer on the surface, The surface of the material has undergone catalytic graphitization treatment to form a graphitized layer, while the interior maintains a hard carbon structure; the particle size of the hard carbon microsphere anode material of the core-shell structure lithium battery is 2 μm, and the capacity reaches 0.1C when the current is 0.1C. 450~mAh / g, and the first efficiency reached 75%, and the capacity still reached 400mAh / g when discharged at a current of 10C, showing good power performance.
[0038] A method for preparing a lithium battery hard carbon microsphere negative electrode material with a core-shell structure, comprising the following process steps:
[0039] A....
Embodiment 2
[0054] A lithium battery hard carbon microsphere negative electrode material with a core-shell structure, characterized in that: the lithium battery hard carbon microsphere negative electrode material with a core-shell structure is made of starch-based hard carbon microspheres and a graphitized layer on the surface, The surface of the material has undergone catalytic graphitization treatment to form a graphitized layer, while the interior maintains a hard carbon structure; the particle size of the hard carbon microsphere negative electrode material of the lithium battery with the core-shell structure is 100 μm, and the capacity reaches 0.1C when the current is 0.1C. 520mAh / g, and the first efficiency reached 87%, and the capacity still reached 490mAh / g when discharged at a current of 10C, showing good power performance.
[0055] A method for preparing a lithium battery hard carbon microsphere negative electrode material with a core-shell structure, comprising the following proc...
Embodiment 3
[0071] A lithium battery hard carbon microsphere negative electrode material with a core-shell structure, characterized in that: the lithium battery hard carbon microsphere negative electrode material with a core-shell structure is made of starch-based hard carbon microspheres and a graphitized layer on the surface, The surface of the material has undergone catalytic graphitization treatment to form a graphitized layer, while the interior maintains a hard carbon structure; the particle size of the hard carbon microsphere negative electrode material for lithium batteries with a core-shell structure is 51 μm, and the capacity reaches 0.1C when discharged at a current of 0.1C 485mAh / g, and the first efficiency reached 81%, and the capacity still reached 445mAh / g when discharged at a current of 10C, showing good power performance.
[0072] A method for preparing a lithium battery hard carbon microsphere negative electrode material with a core-shell structure, comprising the followi...
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