Tantalum-modified high-nickel cathode material and preparation method and application thereof

A positive electrode material, high nickel technology, applied in the direction of positive electrode, active material electrode, battery electrode, etc., can solve the problems of poor thermal stability and structural stability of materials, decreased electrochemical performance of materials, mixed lithium and nickel, etc. Achieve the effect of improving cycle performance, improving electrochemical performance, and simple synthesis method

Active Publication Date: 2020-04-10
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nickel-cobalt-manganese ternary cathode material LiNi x co y mn 1-x-y o 2 (0+ If Occupy Ni 2+ The position of will become "dead lithium" because it cannot be deintercalated, and the Ni 2+ Occupy Li + bit will hinder the Li + The migration of the material will rapidly reduce the electrochemical performance of the material; in addition, the increase of nickel content will also make the thermal stability and structural stability of the material worse

Method used

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  • Tantalum-modified high-nickel cathode material and preparation method and application thereof
  • Tantalum-modified high-nickel cathode material and preparation method and application thereof
  • Tantalum-modified high-nickel cathode material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Lithium hydroxide (LiOH·H 2 0) put into the mortar, then add ethanol for wet milling, grind the granular lithium hydroxide to powder, then add the precursor of 1g high-nickel positive electrode material and 0.003g tantalum pentoxide and grind until the alcohol is evaporated to dryness, A solid powder was obtained. The solid powder is calcined in an oxygen atmosphere. First, it is pre-calcined at 500°C for 5 hours, and then it is heated to 720°C for 15 hours. min. A Ta-modified high-nickel positive electrode material is obtained. Among them, LiOH·H 2 The molar ratio of O to high-nickel precursor powder was 1.02:1.

[0048] figure 1 In order to use X-ray diffractometer to test and analyze the crystal structure of the high-nickel cathode material prepared in Example 1, it can be seen that the ternary cathode material prepared in Example 1 does not change the original high-nickel cathode material (Comparative Example 1). The host crystal structure, both of which are t...

Embodiment 2

[0050] Lithium hydroxide (LiOH·H 2 0) put into the mortar, then add ethanol for wet milling, grind the granular lithium hydroxide to powder, then add the precursor of 1g high-nickel positive electrode material and 0.007g tantalum pentoxide and grind until the alcohol is evaporated to dryness, A solid powder was obtained. The solid powder is calcined in an oxygen atmosphere. First, it is pre-calcined at 500°C for 5 hours, and then it is heated to 720°C for 15 hours. min. A Ta-modified high-nickel positive electrode material is obtained. Among them, the molar ratio of LiOH·H2O to high-nickel precursor powder is 1.02:1.

[0051] figure 1 The XRD pattern in shows that the ternary positive electrode material prepared in Example 2 does not change the main crystal structure of the original high-nickel positive electrode material, both of which are typical α-NaFeO2 structures, belonging to space group. figure 2 It can be seen from the partially enlarged XRD pattern of 15°-30° ...

Embodiment 3

[0053] Lithium hydroxide (LiOH·H 2 0) Putting it into a mortar, adding ethanol for wet milling, grinding the granular lithium hydroxide to powder, then adding 1 g of the precursor of the high-nickel positive electrode material and 0.01 tantalum pentoxide for grinding until the alcohol evaporated to dryness, to obtain solid powder. The solid powder is calcined in an oxygen atmosphere. First, it is pre-calcined at 500°C for 5 hours, and then it is heated to 720°C for 15 hours. min. A Ta-modified high-nickel positive electrode material is obtained. Among them, LiOH·H 2 The molar ratio of O to high-nickel precursor powder was 1.02:1.

[0054] figure 1 The XRD pattern in shows that the high-nickel cathode material prepared in Example 3 does not change the main crystal structure of the original material, both of which are typical α-NaFeO2 structures and belong to the R-3m space group. figure 2 It can be seen from the partially enlarged XRD pattern of 15°-30° in the middle tha...

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Abstract

The invention discloses a tantalum-modified high-nickel cathode material and a preparation method and application thereof. In the material, the tantalum element is doped on the surface of the high-nickel cathode material, and the doping mass of the tantalum element is 0.1-2%. The preparation method comprises the following steps: mixing tantalum pentoxide, the precursor of the high-nickel cathode material and lithium hydroxide, and carrying out high-temperature calcination to obtain the tantalum-modified high-nickel cathode material. According to the invention, Ta doping can stabilize the layered structure of the body material, widen the lithium ion transmission channel, and further improve the electrochemical performance of the high-nickel material.

Description

technical field [0001] The invention relates to a tantalum-modified high-nickel positive electrode material and a preparation method and application thereof, belonging to the field of chemical energy storage batteries. Background technique [0002] At present, lithium-ion batteries (LIB) have been successfully used in electric vehicles and hybrid electric vehicles, alleviating the shortage of fossil fuels and greatly reducing greenhouse gas emissions. Lithium-ion cathode material is a key factor affecting the performance of lithium-ion batteries. The most commonly used lithium-ion battery (LIB) cathode material on the market is the nickel-cobalt-manganese ternary cathode material LiNi x co y mn 1-x-y o 2 (0<x<1, 0<y<1), 0<x+y<1). Nickel-cobalt-manganese ternary cathode material LiNi x co y mn 1-x-y o 2 (0<x<1, 0<y<1, 0<x+y<1) With the increase of Ni content, although the discharge specific capacity increases, but at the same time i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/362H01M4/485H01M4/505H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 王敬李丹华谭国强苏越锋陈实吴锋
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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