Surface-coated ternary cathode material and preparation method thereof

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

Active Publication Date: 2019-08-02
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-coated ternary cathode material and preparation method thereof
  • Surface-coated ternary cathode material and preparation method thereof
  • Surface-coated ternary cathode 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 0.05mol nano-titanium oxide as the titanium source, measure 0.05mol 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-coated ternary positive electrode material and a preparation method thereof, belonging to the technical field of lithium ion battery positive electrode materials. The present invention includes molecular formula is LiNi x co 1‑x‑y mn y o 2 particles, the LiNi x co 1‑x‑y mn y o 2 The particle surface is covered with Li 2 MTiO 4 Nanoparticles, wherein M is at least one metal element in Ni, Co, and Mn. The present invention LiNi x co 1‑x‑y mn y o 2 The basic crystal phase structure of the battery is not destroyed, but a new phase of nanoparticles is coated on the surface to form surface protection, increase the interface stability between the surface of the positive electrode material and the electrolyte, and further improve the cycle retention rate of the material. Enhanced electrochemical performance. The surface alkalinity of the cathode material of the invention is reduced, the water absorption 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 Patents(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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