Quickly-rechargeable long-life high-voltage lithium cobaltate positive electrode material and preparation method
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A positive electrode material, lithium cobalt oxide technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of short cycle life and achieve the effects of extended life, complete crystal crystallization, and increased energy density
Inactive Publication Date: 2016-09-21
湖南美特新材料科技有限公司 +1
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[0006] The present invention is in order to solve the LiCoO prepared by the prior art 2 The problem of short cycle life under the conditions of high voltage and high current fast charging, the purpose of the present invention is to provide a lithium cobalt oxide positive electrode material and a preparation method, which can prolong the life of high rate charge and discharge while increasing the charge cut-off voltage
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Embodiment 1
[0037] According to the molar ratio of 1:0.6:0.095, Li 2 CO 3 、Co 3 o 4 and ZrO 2 As raw material, add 3% co-solvent (MgO) and 1% grain refiner (TiO 2 ), mixed with a high-efficiency mixer for 20 minutes, and fired at 750 ° C for 8 hours to obtain Zr-doped LiCo 0.95 Zr 0.05 o 1.95 ;Add 0.5% Al(OH) 3 and 1.5% grain refiner (TiO 2 ) was efficiently mixed with a high-efficiency mixer for 20 minutes, and calcined at 850° C. for 8 hours to obtain a lithium cobaltate cathode material.
Embodiment 2
[0039] According to the molar ratio of 1:0.6:0.095, Li 2 CO 3 、Co 3 o 4 and CeO 2 As a raw material, 2% co-solvent (PbO) and 1.5% grain refiner (TiO 2 ), mixed efficiently for 20 min, and fired at 750 °C for 8 h to obtain Ce-doped LiCo 0.95 Ce 0.05 o 1.95 ;Add 0.5% Al(OH) 3 and 1.5% grain refiner (TiO 2 ) were efficiently mixed for 20 minutes, and calcined at 850° C. for 8 hours to obtain a lithium cobaltate cathode material.
Embodiment 3
[0041] According to the molar ratio of 1:0.6:0.095:0.095, Li 2 CO 3 、Co 3 o 4 , ZrO 2 and CeO 2 As raw material, add 2% co-solvent (MgO) and 1% grain refiner (TiO 2 ), mixed efficiently for 20min, and fired at 750°C for 10h to obtain Zr, Ce-doped LiCo 0.95 Zr 0.05 Ce 0.05 o 1.9 ;Add 0.5% Al(OH) 3 and 1% grain refiner (TiO 2 ) were efficiently mixed for 20 minutes, and calcined at 850° C. for 10 hours to obtain a lithium cobalt oxide positive electrode material.
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Abstract
The invention relates to a preparation method of a quickly-rechargeable long-life high-voltage lithium cobaltate positive electrode material. The preparation method comprises the following steps: preparing Li<2>CO<3> and Co<3>O<4> as raw materials, adding a doping element M, adding a grain refiner and a cosolvent, and performing first sintering; and adding a grain refiner and a coating compound into a firstly-sintered material serving as a raw material, and performing surface coating and second sintering, wherein the doping element M is one or more of Ti<4+>, Zr<4+>, Mn<4+>, Sn<4+>, Ce<4+>, Ir<3+>, Mg<2+>, Al<3+>, V<5+>, Nb<3+> and Co<2+>, a molecular formula of doped lithium cobaltate is LiCo<1-x>M<y>O<2-y>; and the grain refiner is one or more of oxides of Ti, Nb, V, Al and Zr. The prepared lithium cobaltate positive electrode material has the characteristics of rapid charging, high capacity, high voltage, high cycle and low cost, can be applied under a rapid-charging high-voltage condition, and has superior electrochemical performance.
Description
technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a fast-chargeable long-life high-voltage lithium cobalt oxide cathode material and a preparation method thereof. Background technique [0002] As a new type of green energy storage device, lithium-ion battery occupies a pivotal position in the field of secondary batteries due to its superior performance. With the rapid development of the 4G mobile phone market and small electric tools, the technology of increasing the charge and discharge voltage of the positive electrode material to increase the energy density of the battery has become increasingly mature, and the batteries of most high-end electronic products have been updated to a charge cut-off voltage of 4.35V. The high-voltage battery cell temporarily solves the user's demand for battery capacity. However, when the battery is exhausted, it takes at least 3 hours to fully charge it once. Whether it can be ful...
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