Nickel-cobalt lithium aluminate material coated with sodium-based oxidizing agent and preparation method thereof

A technology of nickel-cobalt lithium aluminate and oxidant, which is applied in the direction of electrochemical generators, electrical components, battery electrodes, etc., can solve the problems of unstable structure, poor electrochemical cycle performance, etc., to improve processing performance and reduce diffusion activation energy , the effect of increasing the layer spacing

Active Publication Date: 2018-10-23
SHAANXI COAL & CHEM TECH INST
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a nickel-cobalt-lithium-aluminate material coated with a sodium-based oxidant and a preparation method thereof, aiming at problems such as unstable structure and poor electrochemical cycle performance of the nickel-cobalt-lithium aluminate ternary material, the present invention The invention can not only improve the structural stability and electrochemical performance of the nickel-cobalt lithium aluminate ternary material, but also improve the processing performance in the material preparation process, simplify the preparation process, and save production costs

Method used

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  • Nickel-cobalt lithium aluminate material coated with sodium-based oxidizing agent and preparation method thereof
  • Nickel-cobalt lithium aluminate material coated with sodium-based oxidizing agent and preparation method thereof
  • Nickel-cobalt lithium aluminate material coated with sodium-based oxidizing agent and preparation method thereof

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preparation example Construction

[0026] A preparation method of a nickel-cobalt-lithium-aluminate material coated with a sodium-based oxidant, comprising the following steps:

[0027] Step 1. Preparation of raw materials. Mix the nickel-cobalt-aluminum hydroxide precursor, additives, and lithium source evenly, place them in high-temperature equipment and perform a calcination under an oxygen atmosphere to obtain a nickel-cobalt-lithium aluminate ternary material;

[0028] Step 2, preparation of the mixture, uniformly mixing the sodium-based oxidant and the nickel-cobalt-lithium-aluminate ternary material.

[0029] Step 3, preparation of modified materials, placing the mixed materials in high temperature equipment for secondary calcination.

[0030] In step 1, the nickel element content in the nickel cobalt aluminum hydroxide precursor is 70%-90% of its total molar content, the cobalt element content is 5%-20% of its total molar content, and the aluminum element content is its total molar content. 0.5%-10% of...

Embodiment 1

[0036] Step 1. Mix lithium hydroxide, nickel-cobalt-aluminum hydroxide precursor and additive magnesium hydroxide evenly, wherein the molar ratio of the three metal elements of nickel-cobalt-aluminum in the nickel-cobalt-aluminum hydroxide precursor is 70:20:10 , the molar ratio of lithium hydroxide to the nickel-cobalt-aluminum hydroxide precursor is 1:1, and the magnesium element content in the magnesium hydroxide is 0.01% of the content of the nickel-cobalt-aluminum hydroxide precursor. The mixture is calcined in a high-temperature equipment under an oxygen atmosphere. The temperature of the first stage of calcination is 480°C, and the holding time is 10h. The temperature of the second stage of calcination is 650°C, and the holding time is 15h. Nickel cobalt lithium aluminate ternary material;

[0037] Step 2, mixing sodium antimonate powder with the obtained nickel-cobalt-lithium-aluminate ternary material evenly, wherein the sodium antimonate is 0.01% of the molar mass of...

Embodiment 1 and comparative example 1

[0042] Embodiment 1 and comparative example 1 performance detection

[0043] Using the nickel-cobalt-lithium-aluminate coated with sodium antimonate in Example 1 of the present invention and the nickel-cobalt-lithium-aluminate positive electrode material in Comparative Example 1, respectively assemble CR2025 button batteries, and charge them at 3.0-4.5V and 1C respectively. discharge cycle test, thus obtaining as figure 1 The comparison diagram of the cycle performance curve shown. Depend on figure 1 It can be seen that compared with the nickel-cobalt-aluminate lithium coated with sodium antimonate in Comparative Example 1, the nickel-cobalt-aluminate lithium coated with sodium antimonate in Example 1 of the present invention has a high discharge capacity. It can be confirmed that the coating modification of sodium antimonate can improve the cycle performance of nickel-cobalt-lithium-aluminate materials.

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Abstract

The invention discloses a nickel-cobalt lithium aluminate material coated with a sodium-based oxidizing agent and a preparation method thereof. According to the method, the surface of the nickel-cobalt lithium aluminate material is coated with a layer of sodium-based oxidizing agent, the sodium-based oxidizing agent is one or more of sodium peroxide, sodium bismuthate and sodium antimonate and hasstrong oxidability, in the sintering process, the oxidizing agent is partially diffused into crystal nuclei of the material, the oxidation of Ni<2+> is promoted, the lithium-nickel synchysis is reduced, a coating layer with a proper thickness is formed on the surface of the material by other part of the oxidizing agent, the material is prevented from being corroded by electrolyte in the chargingand discharging processes, and the cycling stability of the material is improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery cathode materials, in particular to a nickel-cobalt-lithium-aluminate material coated with a sodium-based oxidant and a preparation method thereof. Background technique [0002] Lithium nickel cobalt aluminate is an isotropic solid solution of lithium nickelate, lithium cobaltate, and lithium aluminate. It also has the high capacity, low cost, low toxicity, good cycle performance, high conductivity, and thermal stability of the three. However, due to the high content of nickel, it is more sensitive to moisture, and lithium hydroxide and lithium carbonate are easily formed on the surface, which makes the surface of the material too alkaline. On the one hand, it causes the loss of active lithium ions and reduces the hardness of the material. Charge and discharge capacity; on the other hand, the alkaline substances on the surface are easy to react with the electrolyte, which will cause th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/525H01M4/62H01M10/0525Y02E60/10
Inventor 张超王夏阳寇亮张诚王继锋田占元邵乐
Owner SHAANXI COAL & CHEM TECH INST
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