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Ternary lithium-ion battery cathode material improved by active oxide multiply and preparation method thereof

An active oxide, lithium-ion battery technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problem of reducing the discharge specific capacity and energy density, the oxide has no electrochemical activity, and the material cycle stability is not much improved. and other problems, to achieve the effect of improving rate performance and cycle performance, improving performance in all aspects, and improving lithium ion transmission rate

Active Publication Date: 2017-05-17
广东容钠新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a single modification method cannot effectively solve the above problems. Although the coated oxide can reduce the side reaction with the electrolyte, the oxide does not have electrochemical activity and reduces the discharge specific capacity and energy density; at the same time, the metal element doped Although impurities can improve the rate performance, they do not improve the cycle stability of the material much.

Method used

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  • Ternary lithium-ion battery cathode material improved by active oxide multiply and preparation method thereof
  • Ternary lithium-ion battery cathode material improved by active oxide multiply and preparation method thereof
  • Ternary lithium-ion battery cathode material improved by active oxide multiply and preparation method thereof

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Embodiment 1

[0042] Provide a ternary positive electrode material for lithium-ion batteries with multiple active oxides, the chemical formula is LiNi 1-a- b co a mn b o 2 · cNb 2 o 5 , where a, b, and c are the number of moles, 02 o 5 for active oxides.

[0043] The active oxide multi-improves the ternary positive electrode material of the lithium-ion battery, and is prepared by the following steps:

[0044] (1) Preparation of nickel-cobalt-manganese hydroxide precursor material Ni by liquid-phase co-precipitation method 1-a-b co a mn b (OH) 2 ;

[0045] (2) In terms of molar ratio, take the niobium source according to the ratio of Nb:(Ni+Co+Mn)=2c:1, add a dispersant, and make a dispersant mixed solution with a concentration of 0.001~0.5mol / L. The nickel-cobalt-manganese hydroxide precursor material prepared in the above step (1) is put into the mixed solution of the dispersant, stirred for 0.5-5 hours, and then evaporated to dryness under constant stirring, so that the niobiu...

Embodiment 2

[0054] Provided is a method for preparing active oxide multiple-improved lithium-ion battery ternary cathode materials, which is prepared through the following steps,

[0055] (1) Preparation of nickel-cobalt-manganese hydroxide precursor material Ni by liquid-phase co-precipitation method 1-a-b co a mn b (OH) 2 ;

[0056] (2) In terms of molar ratio, take the niobium source according to the ratio of Nb:(Ni+Co+Mn)=2c:1, add a dispersant, and make a dispersant mixed solution with a concentration of 0.001~0.5mol / L. The nickel-cobalt-manganese hydroxide precursor material prepared in the above step (1) is put into the mixed solution of the dispersant, stirred for 0.5-5 hours, and then evaporated to dryness under constant stirring, so that the niobium source is adsorbed on the nickel-cobalt-manganese hydroxide The surface of the precursor material is obtained to obtain the precursor material of nickel cobalt manganese hydroxide adsorbed by niobium;

[0057] (3) According to t...

Embodiment 3

[0060] Provided is a method for preparing active oxide multiple-improved lithium-ion battery ternary cathode materials, which is prepared through the following steps,

[0061] (1) Preparation of nickel-cobalt-manganese hydroxide precursor material Ni by liquid-phase co-precipitation method 1-a-b co a mn b (OH) 2 ;

[0062] (2) In terms of molar ratio, the metal ion ratio of the lithium source and the nickel-cobalt-manganese hydroxide precursor material is Li: (Ni+Co+Mn)=1~1.1:1 ratio, the lithium source and the nickel-cobalt Manganese hydroxide precursor materials are mixed, then put into the mixing tank, after mixing for 2-20 hours, heat pretreatment at 400-700°C for 2-10 hours under oxygen or dry air atmosphere, and then heat up to 750-950°C Sintering for 10 to 30 hours, and naturally cooling to room temperature to obtain an uncoated positive electrode material;

[0063] Weigh the niobium source according to the ratio of Nb:(Ni+Co+Mn)=2c:1, add a dispersant to prepare a...

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Abstract

The invention discloses a ternary lithium-ion battery cathode material improved by active oxide multiply and a preparation method thereof. The ternary cathode material has the chemical formula as follows: LiNi1-a-bCoaMnbO2*cNb2O5, wherein a, b and c are mole numbers, a is greater than 0 and smaller than or equal to 0.4, b is greater than 0 and smaller than or equal to 0.4, c is greater than 0 and smaller than or equal to 0.05, and Nb2O5 is active oxide. The preparation method comprises the following steps: coating the surface of a precursor or a positive electrode material with a niobium source, mixing lithium into the precursor, and sintering at high temperature or performing heat treatment at low temperature to prepare the ternary lithium-ion battery cathode material of which the surface is doped with metal ions Nb5<+> and is coated with the oxide Nb2O5. The active oxide Nb2O5 can improve the ternary cathode material multiply. The ternary lithium-ion battery cathode material provided by the invention is greatly improved in aspects of cycle performance and rate performance of a battery, and has excellent electrochemical performance under a high-temperature and large-rate cycle condition.

Description

technical field [0001] The invention relates to the technical field of positive electrode materials for lithium ion batteries, in particular to a ternary positive electrode material for lithium ion batteries with multiple active oxides and a preparation method thereof. Background technique [0002] With the rapid development of electric vehicles (electric vehicles) and smart grids (smart grid), the market demand for lithium-ion batteries with high energy density and high power density is increasing. Therefore, research and development of lithium-ion batteries with excellent electrochemical performance Ion batteries are imminent. At present, compared with the traditional lithium cobalt oxide material (LiCoO 2 ), due to many advantages such as low price, environmental friendliness, high specific capacity, and stable performance, cathode materials based on ternary materials have gradually become one of the main directions of research. However, ternary materials still have man...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/1391H01M4/48
CPCH01M4/131H01M4/1391H01M4/48Y02E60/10
Inventor 杨成浩欧星熊训辉
Owner 广东容钠新能源科技有限公司
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