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Surface clad lithium ion battery positive material precursor, and preparation method and application thereof

A technology for lithium-ion batteries and positive electrode materials, which is applied to battery electrodes, circuits, electrical components, etc., to reduce side reactions, increase production raw material costs, and reduce collapse

Active Publication Date: 2013-10-23
SUZHOU GCL ENERGY TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Compared with traditional materials, although ternary materials have considerable advantages, there is still room for further improvement in the performance of ternary materials

Method used

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  • Surface clad lithium ion battery positive material precursor, and preparation method and application thereof
  • Surface clad lithium ion battery positive material precursor, and preparation method and application thereof
  • Surface clad lithium ion battery positive material precursor, and preparation method and application thereof

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Embodiment 1

[0031]Nickel sulfate, cobalt sulfate, and manganese sulfate were prepared in a molar ratio (1:1:1) to prepare 50 L of salt solution with a concentration of 1.8 mol / L. The prepared solution was injected into a reaction kettle with a rotation speed of 250rps through a metering pump at a rate of 4L / h, and the temperature of the reaction kettle was kept at 50°C. Inject 20% ammonia water and 8mol / L NaOH solution at the same time, adjust the flow rate of the alkali solution, and keep the pH value stable between 9-12 through the pH tester, until the salt solution is completely injected into the reactor, the preparation of the core part of the precursor The reaction is complete, and the particle size of the core part is 5-15 microns. After the reaction is completed, the solid-liquid mixture is filtered through the filter, and after washing to neutrality, the filtered solid part is re-added to the reactor, and 1L of the prepared 1mol / L cobalt sulfate solution is injected at a rate of 0...

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Abstract

The invention relates to a surface clad lithium ion battery positive material precursor, and a preparation method and application thereof. The precursor has the composition of NixCoyMnzM1-x-y-z(OH)2, wherein x is greater than 0 and less than 0.8, y is greater than 0 and less than 0.5 and z is greater than 0 and less than 0.5; M refers to a cladding metal ion which is one or more selected from Al, Zn, Zr, Co, Ti, Sn, Mg and the like; the precursor is composed of a core part and a metal ion nanoparticle layer covering the core surface. The molecular formula of the core part is NikConMn1-k-n(OH)2, wherein k is greater than 0 and less than 0.8 and n is greater than 0 and less than 0.5. As the metal ion nanoparticle cladding layer is formed through even growth in a liquid phase, an excellent and close cladding layer can be formed on the spherical surface; the cladding layer is formed with an oxide with stable chemical properties through subsequent treatment, so that the positive material can be isolated from the electrolyte, side reaction can be reduced, dissolution of metal ions can be inhibited and collapse of the material structure in repeated charge / discharge processes can be lowered down; therefore, the cycle performance, safety performance and rate capability of the material are optimized; as a result, the material is capable of better meeting the requirements of a power battery.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery positive electrode materials, and in particular relates to a surface-coated composite multi-element lithium-ion battery positive electrode material precursor and a preparation method and application thereof. Background technique [0002] Lithium-ion secondary batteries have the advantages of high specific energy, long cycle life and stable discharge performance, making them ideal power sources for various portable electronic products. The traditional lithium-ion battery cathode material is mainly lithium cobalt oxide LiCoO 2 However, due to high cost and poor safety, lithium cobalt oxide materials cannot meet the requirements of electric vehicles, energy storage and other fields. And layered nickel-cobalt-manganese ternary lithium-ion battery cathode material nickel-cobalt manganese lithium lithium (Ni x co y mn 1-x-y )0 2 Integrated LiCoO 2 , LiMn 2 o 4 、LiFePO 4 The advantag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122Y02E60/10
Inventor 谢松鲁勇生柳俊
Owner SUZHOU GCL ENERGY TECH DEV CO LTD
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