Ternary positive electrode material doped with Er and Zr metal ions and preparation method thereof
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A positive electrode material and metal ion technology, applied in the field of Zr metal ion mixed doping ternary positive electrode material and its preparation, Er, to achieve the effect of reducing polarization, reducing cation mixing, and stabilizing the crystal structure
Active Publication Date: 2018-02-23
GEM (HUBEI) NEW ENERGY MATERIALS CO LTD
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[0003] In view of the above problems, the ...
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preparation example Construction
[0018] Such as figure 1 As shown, the preparation method of Er, Zr metal ion mixed doping ternary cathode material provided by the present invention comprises the following steps:
[0019] S1. Pre-sintering step.
[0020] Weigh the nickel-cobalt-lithium-aluminate precursor, spray it with high-purity water, mix it evenly, and transfer it to a sintering furnace for pre-sintering. Here, the mass ratio of spraying high-purity water mixed with the nickel-cobalt-lithium-aluminate precursor is 1%-10%, the pre-sintering temperature is 300-700°C, and the time is 2-10h.
[0021] S2. The step of configuring a doping element solution.
[0022] A certain mass ratio of Er source and Zr source is selected and added into deionized water for stirring, and ultrasound is performed while stirring to obtain a mixed solution of Er and Zr. The molar ratio of the Er source and the Zr source selected here is 1:1, the quality of the added deionized water is 3-10 times of the total mass of the Er sou...
Embodiment
[0035] 1) Weigh 200g of nickel-cobalt-lithium-aluminate precursor, spray 5% high-purity water, mix evenly, and put it in a sintering furnace for pre-sintering, at a ventilation rate of 5m 2 / h, the temperature is 500 ℃, sintering 5h.
[0036] 2) Weigh 44.3g of erbium nitrate and 42.9g of zirconium nitrate and put them into a flask, add 872mL of water, and use ultrasound and a stirrer to sonicate for 3h while stirring.
[0037] 3) Weigh 100g of pre-calcined NCA precursor, put it into a flask, add 58.7g of lithium source, and then add 650mL of deionized water, using ultrasonic and While stirring with the stirrer for 3h, add 12mL of the mixed solution of Er and Zr dropwise while stirring ultrasonically.
[0038] 4) Put the mixed materials into the reaction kettle with built-in polytetrafluoroethylene lining, tighten the lid of the reaction kettle, and then put it in the oven, set it at 180°C and 15h.
[0039] 5) The material after hydroheating is subjected to rotary evaporation...
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Abstract
The invention is applicable to the technical field of lithium batteries and provides a preparation method of a ternary positive electrode material doped with Er and Zr metal ions. The preparation method includes a step of pre-sintering, a step of preparing a doping element solution, a step of mixing, a step of hydrothermal treatment, and a step of drying, and a step of sintering. The preparation method pre-sinters a NCA precursor into a porous honeycomb-shaped spheroidal pre-sintered precursor by a pre-sintering method, then prepares a solution with Er and Zr sources in proportions, mixes thesolution with the pre-sintered precursor under a water condition, effectively introduces the Er and Zr solution into the positive electrode material substrate through honeycomb-shaped holes, then addslithium, melts the Er and Zr sources, the substrate, and the lithium source under hydrothermal and high temperature and high pressure conditions for sufficient and effective reaction, finally sintersthe material at a high temperature, and crystallizes the finished product to obtain a doped nickel-cobalt-aluminate positive electrode material. Zr4<+> can reduce cation mixing, and Er3<+> can reducepolarization and enhance electrochemical performance, so that Er3<+>/Zr4<+>, during charging, does not undergo electrochemical reaction, has no change in valence, and can play a role in stabilizing the crystal structure.
Description
technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium batteries, and in particular relates to a ternary positive electrode material mixed with Er and Zr metal ions and a preparation method thereof. Background technique [0002] Nickel cobalt lithium aluminate ternary cathode material is widely used in IT products and new energy vehicles due to its high energy density. However, pure nickel-cobalt-aluminate lithium (LNCA) is prone to cation mixing due to its poor structural stability and high nickel content. 2+ , Li + Occupy each other and hinder Li + transport and disrupt material crystal structures, and the Li + The communication ability between the grain boundaries is poor, which causes great harm to the cycle life and capacity of the material. Contents of the invention [0003] In view of the above problems, the purpose of the present invention is to provide a solution to the existing problems. [0004] On th...
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