Positive electrode material of multi-component composite lithium ion cell and its preparation method

A lithium-ion battery and cathode material technology, applied in the field of lithium-ion battery cathode materials and its preparation, can solve the problems of gas swelling, explosion, and difficulty in uniform mixing of various elements, etc., and achieve the effect of low preparation cost and controllable operation

Active Publication Date: 2008-12-10
BTR NEW MATERIAL GRP CO LTD
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AI Technical Summary

Problems solved by technology

[0004] At present, the research on nickel-cobalt-manganese / lithium aluminate ternary series multi-component composite positive electrode materials is progressing rapidly, but the uniform mixing of multiple elements is a difficult problem. The applicant synthesized a quasi-spherical nickel-cobalt-aluminum / manganese ternary series metal by molecular level mixing method Oxide lithium-ion battery cathode material, with a high specific capacity of 150-215mAh / g, while the currently commonly used LiCoO 2 The actual capacity of the positive electrode material is only 130-140mAh / g, but this kind of ternary material has safety problems of inflation and explosion during application, which limits its large-scale industrial application to a certain extent

Method used

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  • Positive electrode material of multi-component composite lithium ion cell and its preparation method
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  • Positive electrode material of multi-component composite lithium ion cell and its preparation method

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preparation example Construction

[0023] The multi-element composite lithium-ion battery cathode material of the present invention and preparation method thereof, adopt the following steps:

[0024] 1. Synthesis of matrix materials, respectively prepare alkali solution lithium hydroxide or sodium hydroxide with a concentration of 0.5-8 mol / L, Ni salt solution, Co salt solution and Mn / Al salt solution with a concentration of 0.5-8 mol / L, in In the prepared Ni salt solution, Co salt solution and Mn / Al salt solution, add 0-2% additives by mass respectively, the additives are ammonia water, ethylene glycol, ethylenediamine, sodium dodecyl-hexadecylsulfonate and more than one of polyethylene glycol. At the same time, add it into the reaction kettle at the same flow rate, the flow rate is 10-100L / h, and stir continuously to make it form a uniform precipitate. At the same time, control the dropping speed of the alkali solution to adjust the pH value of the solution between 8 and 11.5.

[0025] 2. Matrix lattice dopi...

Embodiment 1

[0032] Embodiment 1, prepare the sodium hydroxide alkali solution of 2mol / L concentration earlier, prepare the nickel nitrate, cobalt, manganese salt solution that the molar ratio of 1mol / L is 5:3:2, preparation concentration is the whole solution quality 2% simultaneously For the mixed solution of ammonia water and ethylene glycol, the prepared solutions are simultaneously added to the reaction kettle at a flow rate of 60L / h, and continuously stirred to form a uniform precipitate, and the pH value of the solution is adjusted at 10.8 by controlling the dropping speed of the alkali solution .

[0033] When the ion concentration of Ni, Co, and Mn is 600pmm, add 0.6mol / L aluminum nitrate solution to the solution at a certain rate of 30L / h, and stop the reaction when the ion concentration is lower than 200pmm.

[0034] Filter the precipitated powder in a vacuum filter, measure the pH value of the filtrate to 5, and titrate the filtrate with barium nitrate. When there is no obvious...

Embodiment 2

[0037] Embodiment 2, prepare the lithium hydroxide alkaline solution of 0.5mol / L concentration earlier, prepare the nickel nitrate, cobalt, manganese salt solution that the molar ratio of 0.5mol / L is 5:3:2, preparation concentration is the whole solution quality 0.5 simultaneously % mixed solution of ammonia water and ethylenediamine, each prepared solution is added to the reaction kettle at the same time at a flow rate of 10L / h, and continuously stirred to form a uniform precipitate, and the pH value of the solution is adjusted by controlling the dropping speed of the alkali solution at 8.

[0038] When the concentration of Ni, Co and Mn ions is 200pmm, add 0.6mol / L titanium nitrate and aluminum nitrate solution to the solution at a certain rate of 10L / h, and stop the reaction when the ion concentration is lower than 200pmm.

[0039] Filter and wash the precipitated powder in a vacuum filter, measure the pH value of the filtrate to be around 5, and titrate the filtrate with b...

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Abstract

The invention discloses a positive pole material of multiple composite lithium iron battery and a production method thereof, the technical issue to be solved is to improve electrochemical performances of the positive pole material, the positive pole material of the invention has the general formula: Li0.8-1.2NixCoyzO2, the crystal structure of the positive pole material is hexagonal system; crystal lattice is doped with more than one elements selected from the group consisting of Ti, Al, Mg, Cr, Zn, Ce, La, Lu, Y and F, the production method of the positive pole material comprises the steps of: synthesis of substrate materials, doping of substrate crystal lattices, mixing with lithium source compounds, sintering. As compared with the prior art, the produced positive pole material of multiple composite lithium iron battery of the invention combines into the simulative battery with metallic lithium sheets, and discharges and charges at 0.3C of discharge and charge current density, when the discharge and charge voltage is 2.5-4.2V, the maximum discharge capacitance reaches over 160mAh / g, the first Coulomb efficiency reaches more than 90%, the capacitance retention rate after circulation for 100 weeks is above 92%, the costs of raw materials and production are low, accordingly, the invention is apt for large-scale industrial production.

Description

technical field [0001] The invention relates to a lithium ion battery cathode material and a preparation method thereof, in particular to a lithium ion battery cathode material and a preparation method thereof. Background technique [0002] Lithium-ion secondary batteries have the advantages of high energy density, long cycle life and low self-discharge rate. Since Sony successfully realized the commercial production of lithium-ion secondary batteries in the 1990s, lithium-ion batteries have been widely used in various portable In terms of electronic products and mobile tools, it also has great application prospects in electric vehicle EV and hybrid electric vehicle HEV power supply. The cathode material currently studied is mainly LiCoO with a layered structure. 2 , LiNiO 2 , LiMnO 2 , LiMn with spinel structure 2 o 4 and forsterite-structured phosphate series. LiCoO 2 Due to relatively high cost and relatively low capacity, the theoretical capacity is as high as 274...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/48H01M4/04B01J19/00H01M4/505H01M4/525
CPCY02E60/10
Inventor 岳敏李斌张万红贺雪琴
Owner BTR NEW MATERIAL GRP CO LTD
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