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A preparation method of hybrid surface of layered cathode material for lithium ion battery

A technology for lithium ion batteries and positive electrode materials is applied in the field of preparation of hybrid surfaces of layered positive electrode materials for lithium ion batteries, and achieves the effects of stabilizing the surface structure, improving electrochemical performance, and being easy to popularize.

Active Publication Date: 2021-02-09
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, the electrochemical performance of lithium-ion battery cathode materials prepared by the above method still needs to be further improved to meet the requirements of large-scale industrial production.

Method used

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  • A preparation method of hybrid surface of layered cathode material for lithium ion battery
  • A preparation method of hybrid surface of layered cathode material for lithium ion battery
  • A preparation method of hybrid surface of layered cathode material for lithium ion battery

Examples

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preparation example Construction

[0039] The preparation method comprises the following steps:

[0040] The first step: preparing a Ni-Co-Mn precursor according to the molar ratio of the transition metal element shown in the general formula of the layered positive electrode material;

[0041] There are multiple methods for preparing Ni-Co-Mn precursors in the prior art. From the perspective of synthesis effect, the present invention adopts the co-precipitation method to synthesize Ni-Co-Mn precursors. The types of the precursors include [Ni 1-x-y co x mn y ](OH) 2 or [Ni 1-x-y co x mn y ]CO 3 , can be prepared by conventional methods in the prior art, for example, by one or both of hydroxide or carbonate co-precipitation methods.

[0042] The second step: the Ni-Co-Mn precursor obtained in the above steps is placed in a polyanion (XO 4 ) n- solution, stirred at 20-80°C for 1-12h, wherein the molar ratio of the polyanion to the transition metal ion in the solution is (XO 4 ) n- / (Ni-Co-Mn)=0.02~0.1, at...

Embodiment 1

[0066] Embodiment 1 prepares precursor [Ni 1 / 6 co 1 / 6 mn 4 / 6 ]CO 3

[0067] Weigh 2.19Kg NiSO 4 ·6H 2 O, 2.34Kg CoSO 4 ·7H 2 O and 5.63Kg MnSO 4 ·H 2 O preparation concentration is 25L of 2M salt solution. Add the above salt solution to 1L h -1 The speed is added dropwise to the rotating speed of 600rpm in the continuous stirring reactor, and at the same time with 5M Na 2 CO 3 The mixed solution of the solution and 0.5M ammonia solution controls the pH value in the kettle to about 8 until the salt solution is completely consumed, and the precipitate is centrifuged, washed, and dried to obtain the precursor [Ni 1 / 6 co 1 / 6 mn 4 / 6 ]CO 3 , its XRD such as figure 1 shown. The precursor (Ni 1 / 6 co 1 / 6 mn 4 / 6 )CO 3 Put in 0.1M KH 2 PO 4 (50ml) The M formed after stirring the solution for 4h 3 (PO 4 ) 2 Coating (Ni 1 / 6 co 1 / 6 mn 4 / 6 )CO 3 ,Such as figure 2 (a). The M 3 (PO 4 ) 2 Coating (Ni 1 / 6 co 1 / 6 mn 4 / 6 )CO 3 with stoichiometric battery-g...

Embodiment 2

[0071] The hybrid surface lithium-rich layered positive electrode material of Example 1 was prepared as an electrode, and a 2032 button battery was assembled, and a charge-discharge test was performed at a voltage of 2.0-4.8V and a current density of 20mA / g. The hybrid surface lithium-rich layered Cathode material Li 1.2 [Ni 0.13 co 0.13 mn 0.54 ]O 2 The discharge specific capacity in the first week is 301.2mAh / g, such as image 3 Shown in (a); Its capacity retention rate is 94.5% after 80 weeks of charge-discharge cycles, as image 3 (b) shown.

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Abstract

The invention discloses a preparation method of a hybrid surface of a lamellar positive electrode material of a lithium ion battery. The method comprises the steps that a precursor is placed in a polyanion (XO4)n- (X=P or Si) solution, the solubility product constant Ksp of the polyanions and transitional metal ions is lower, the chemical reaction takes place has the priority to take place on thesurface of the precursor, so that the conversion reaction from a precursor surface hydroxide phase or carbonate salt phase to a polyanion phase takes place, and the precursor with a polyanion coated surface is obtained; a stoichiometric-ratio lithium source is added to allow the mole ratio of the lithium and the transitional metal to be Li / Ni-Co-Mn=(1+z) / (1-z)-(1+z) / (1-z)+0.05, only 1.5 mol% of the polyanions can be doped into a body structure of a lamellar material under high-temperature calcination due to larger ion radius of the polyanions, and remaining polyanions form a fast ionic conductor phase Li3PO4 or Li2SiO3 on the surface of the lamellar material surface with the lithium ions, and finally the lamellar positive electrode material which has a polyanion (XO4)n- doped surface, coexists with the fast ionic conductor phase and has a hybrid surface of the lithium ion battery is formed.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a method for preparing a hybrid surface of a layered positive electrode material of a lithium ion battery. Background technique [0002] As a high-energy-density energy storage technology, lithium-ion batteries have been widely used in "3C" portable electronic devices, and are gradually expanding to large-capacity, high-power systems such as electric tools and automobiles, high-efficiency energy storage and military systems. Compared with carbon negative electrodes with excellent comprehensive performance, high cost and low capacity cathode materials limit the performance improvement of lithium ion batteries and their wide application in large capacity and high power systems. Therefore, the development of low cost, high performance cathode materials is of great importance It is of great significance to promote the development of lithium-ion batteries. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 侯配玉李凤徐锡金
Owner UNIV OF JINAN
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