Surface coating type ternary positive electrode material and preparation method thereof

A positive electrode material and surface coating technology, applied in the field of surface coated ternary positive electrode material and its preparation, can solve the problems of low specific capacity and cycle performance, failure to meet commercial requirements, unfavorable electron conduction, etc., to achieve enhanced electric capacity Effects of chemical properties, increased interface stability, and improved cycle retention

Active Publication Date: 2017-07-11
SHANDONG YUHUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In CN 10322094A patent, LiM2O 2 The oxide is solid-dissolved in Li 2 M1TiO 4 A solid solution is formed in the titanium composite oxide, although this solid solution method improves the Li 2 M1TiO 4 The amount of lithium that can be deintercalated, but the solid solution inhibits LiM2O 2 Performance
Moreover, Li in solid solution 2 M1TiO 4 Up to 50% or more, which is not conducive to electron conduction
In general, the specific capacity and cycle performance of this solid solution material are far lower than those of the ternary cathode material, and cannot meet commercial requirements.

Method used

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  • Surface coating type ternary positive electrode material and preparation method thereof
  • Surface coating type ternary positive electrode material and preparation method thereof
  • Surface coating type ternary positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Measure 1 mol of LiNi 0.8 co 0.1 mn 0.1 o 2 As the material to be coated, due to the existence of residual LiOH on the surface, the material is strongly alkaline, with a pH of about 12. At the same time, LiNi 0.8 co 0.1 mn 0.1 o 2 The residual lithium on the surface acts as Li 2 NiTiO 4 Lithium source, take 0.05 mol nano-titanium oxide as the titanium source, take 0.05 mol nickel hydroxide as the nickel source, mix the above materials uniformly by ball milling, and perform calcination at 400-800°C under air atmosphere for 10- 20 h. Obtaining surface-coated LiNi 0.8 co 0.1 mn 0.1 o 2 , namely Li 2 NiTiO 4 coated LiNi 0.8 co 0.1 mn 0.1 o 2 .

[0030] according tofigure 1 , figure 2 The test results show that the surface-coated LiNi 0.8 co 0.1 mn 0.1 o 2 Fine nanoparticles are evenly distributed on the surface of the particles, and the appearance of these nanoparticles indicates that the Li 2 NiTiO 4 In LiNi 0.8 co 0.1 mn 0.1 o 2 The surface ...

Embodiment 2

[0039] Measure 1 mol of LiNi 0.8 co 0.1 mn 0.1 o 2 As the material to be coated, due to the existence of residual LiOH on the surface, the material is strongly alkaline, with a pH of about 12. At the same time, LiNi 0.8 co 0.1 mn 0.1 o 2 The residual lithium on the surface acts as Li 2 CoO 4 Lithium source, measure 0.05 mol of titanium dioxide as the titanium source, measure 0.05 mol of manganese nitrate as the manganese source, mix the above materials uniformly by ball milling, and perform calcination at 400-800°C for 10-20 h in an air atmosphere . Obtaining surface-coated LiNi 0.8 co 0.1 mn 0.1 o 2 , namely Li 2 MnTiO 4 coated LiNi 0.8 co 0.1 mn 0.1 o 2 .

Embodiment 3

[0041] Measure 1 mol of LiNi 0.8 co 0.1 mn 0.1 o 2 As the material to be coated, due to the existence of residual LiOH on the surface, the material is strongly alkaline, with a pH of about 12 and LiNi 0.8 co 0.1 mn 0.1 o 2 The residual lithium on the surface acts as Li 2 CoO 4 Lithium source, measure 0.05 mol of titanium dioxide as the titanium source, measure 0.05 mol of cobalt hydroxide as the cobalt source, mix the above materials uniformly by ball milling, and perform calcination at 400-800°C under air atmosphere for 10-20 h. Obtaining surface-coated LiNi 0.8 co 0.1 mn 0.1 o 2 , namely Li 2 CoO 4 coated LiNi 0.8 co 0.1 mn 0.1 o 2 .

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Abstract

The invention discloses a surface coating type ternary positive electrode material and a preparation method thereof, and belongs to the technical field of positive electrode materials of lithium ion batteries. The surface coating type ternary positive electrode material includes particles having the molecular formula of LiNi[x]Co[1-x-y]Mn[y]O[2], and the surface of the LiNi[x]Co[1-x-y]Mn[y]O[2] particles is covered with Li2MTiO4 nanoparticles, wherein M is at least one of metal elements of Ni, Co and Mn. A basic crystal phase structure of LiNi[x]Co[1-x-y]Mn[y]O[2] is not damaged, only the surface is coated with the new-phase nanoparticles, the surface protection is formed, and the stability of the interface of the surface of the positive electrode material and an electrolyte solution is increased, so the material circulation maintaining rate is further improved, and the electrochemical performance is enhanced. The surface alkalinity of the positive electrode material is lowered, the hygroscopic property is suppressed, and the processing performance is improved.

Description

technical field [0001] The invention relates to the technical field of positive electrode materials for lithium ion batteries, in particular to a surface-coated ternary positive electrode material coated with nanoparticles on the surface and a preparation method thereof. Background technique [0002] With the development of science and technology, people's demand for batteries is increasing. Due to its excellent performance, lithium-ion batteries have become the mainstream development direction of secondary batteries. They are widely used in mobile terminal equipment such as smartphones, tablet computers, cameras, and VR. They have also become the first choice for new energy electric vehicles and energy storage. [0003] Lithium-ion battery cathode materials are the most critical technical link of lithium-ion batteries. Currently, the mainstream cathode materials on the market include lithium manganese oxide, lithium iron phosphate and ternary cathode materials. The ternary...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/485H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/485H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 张会斌赵洪东牛龙伟于文倩王瑛赵成龙
Owner SHANDONG YUHUANG NEW ENERGY TECH
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