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High-voltage, high-compaction and low-cost lithium cobaltate positive electrode material and preparation method thereof

A positive electrode material, lithium cobalt oxide technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor cycle performance and high cost of lithium cobalt oxide batteries, improve cycle life and safety performance, improve compaction density, The effect of stabilizing the crystal structure

Active Publication Date: 2018-06-15
GEM JIANGSU COBALT IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of the above problems, the object of the present invention is to provide a high-voltage, high-compression, low-cost lithium cobalt oxide positive electrode material and its preparation method, aiming to solve the technical problems of poor cycle performance and high cost of existing lithium cobalt oxide batteries

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preparation example Construction

[0020] The preparation method of the high-voltage, high-compression and low-cost lithium cobalt oxide cathode material provided by the present invention comprises the following steps:

[0021] S1. Add the lithium source, large particle size cobalt tetroxide and additive A into the high-speed mixer at the molar ratio of Li:Co:A=(1.02~1.07):1:(0.005~0.01) and mix well, and then carry out High temperature sintering, the additive A at least includes nanoscale In 2 o 3 , also including at least one of strontium phosphate, molybdenum oxide, cerium oxide, iridium oxide, and bismuth oxide. The lithium source is lithium carbonate. During the sintering process, the sintering temperature is 1000-1200° C., the sintering holding time is 8-15 hours, air is blown in during the sintering process, and the air flow rate is 0.2-1.2 m 3 / h, the heating rate during the sintering process is 2.0-8.0°C / min, and the mixing time of the high-speed mixer is 10-30min. Additive A median particle size D5...

Embodiment 1

[0030] (1) Lithium carbonate, large particle size cobalt tetroxide, additive A (nano In 2 o 3and nano-strontium phosphate) Weigh the corresponding raw materials according to the molar ratio Li:Co:A=1.025:0.993:0.007, and then add them together into a high-speed mixer to fully mix them evenly, and the mixing time is 15 minutes. Put the mixture in a box furnace for sintering, and pass through 0.5m 3 / h flow of air, the heating rate is 2°C / min, the sintering temperature is 1100°C, sintering is kept for 12 hours and then cooled with the furnace to obtain the sintered material. The sintered material is crushed and passed through a 325-mesh screen to obtain a large particle size Lithium cobalt oxide cathode material.

[0031] (2) Lithium carbonate, nickel-cobalt-manganese composite precursor with small particle size and nano-sized iridium oxide are weighed according to the molar ratio Li:Me:B=1.006:0.994:0.009 and then added to the high-speed mixer together Mix thoroughly and eve...

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Abstract

The invention is applicable to the field of a lithium battery positive electrode material, and provides a high-voltage, high-compaction and low-cost lithium cobaltate positive electrode material and apreparation method thereof. The method comprises the steps of firstly, preparing a large-grain size lithium cobaltate positive electrode material doped with an additive A; secondly, preparing a small-grain size nickel cobalt manganese ternary positive electrode doped with an additive B; thirdly, mixing the large-grain size lithium cobaltate positive electrode material and the small-grain size nickel cobalt manganese ternary positive electrode according to a mass ratio, so that the compaction density of the material can be fully improved, and the cost of the positive electrode material can bereduced; and finally, performing sintering and smashing on the mixture and a coating agent C comprising indium sulfide to obtain a final finished product of the lithium cobaltate positive electrode material. By doping In<3+>, the structural stability of lithium cobaltate under a high-voltage state can be ensured, the cycle lifetime of the material is prolonged, and the safety of the material is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium battery cathode materials, in particular to a high-voltage, high-pressure, low-cost lithium cobalt oxide cathode material and a preparation method thereof. Background technique [0002] Among lithium-ion cathode materials, lithium cobalt oxide is widely used due to its high working voltage and energy density, easy synthesis and fast charge and discharge. In recent years, with the further miniaturization and multi-functionalization of electronic products, higher requirements have been placed on the energy density of battery output, and conventional lithium cobalt oxide can no longer meet the requirements. Under the premise of ensuring safety and proper circulation, improving the energy (mainly volume energy density) of lithium batteries is still the basic development direction of small lithium batteries in the next few years. There are two main ways to improve energy density. Capacity or increase ...

Claims

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Application Information

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IPC IPC(8): H01M4/525
CPCH01M4/525Y02E60/10
Inventor 徐世国王星宁栗志涛宋健巍靳亚珲丁文秀
Owner GEM JIANGSU COBALT IND CO LTD
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