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Lithium ion battery positive electrode material with low surface lithium ion content and preparation method thereof

A technology for lithium ion batteries and cathode materials, which is applied in the field of cathode materials for lithium ion batteries and their preparation, can solve the problems of time-consuming and laborious production efficiency, and achieves the effects of uniform dispersion, simple process flow and simplified process flow

Inactive Publication Date: 2018-11-23
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional modification method is generally divided into two steps, that is, washing with water first, and then dry coating, which is time-consuming and labor-intensive, and the production efficiency is low

Method used

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  • Lithium ion battery positive electrode material with low surface lithium ion content and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] According to lithium hydroxide monohydrate and Ni 0.8 co 0.1 mn 0.1 (OH) 2 The molar ratio is 1.01, they are added in a high-speed mixer and mixed evenly, and then sintered at 790°C for 12h in a pure oxygen atmosphere to obtain an unmodified powder. Then nano ZrO 2 Ultrasonic mixing with 60 °C pure water to obtain a suspension with a mass concentration of 0.1%, and finally according to the nano-ZrO 2 The mass ratio of unmodified powder and unmodified powder is 2:1000, add unmodified powder, stir and mix, filter and evaporate to dryness, and sinter at 600°C for 2 hours to obtain a modified high-nickel cathode material.

Embodiment 2

[0021] According to lithium hydroxide monohydrate and Ni 0.82 co 0.12 mn 0.6 (OH) 2 The molar ratio is 1.03. After they are added into a high-speed mixer and mixed evenly, they are sintered at 770° C. for 15 hours under a pure oxygen atmosphere to obtain an unmodified powder. Nano ZrO 2 Mix with pure water at 60°C to obtain a suspension with a mass concentration of 0.2%, and finally follow the nano-ZrO 2 The mass ratio of unmodified powder and unmodified powder is 2.7:1000, add unmodified powder, stir and mix, filter and evaporate to dryness, and sinter at 500°C for 4 hours to obtain a modified high-nickel cathode material.

Embodiment 3

[0023] According to lithium hydroxide monohydrate and Ni 0.85 co 0.1 mn 0.5 (OH) 2 The molar ratio is 1.05. After they are added into a high-speed mixer and mixed evenly, they are sintered at 730° C. for 18 hours under a pure oxygen atmosphere to obtain an unmodified powder. Nano ZrO 2 Mix with pure water at 60°C to obtain a suspension with a mass concentration of 0.3%, and finally follow the nano-ZrO 2 The mass ratio of unmodified powder and unmodified powder is 4.05:1000, add unmodified powder, stir and mix, filter and evaporate to dryness, and sinter at 400°C for 6 hours to obtain a modified high-nickel cathode material.

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Abstract

The invention discloses a lithium ion battery positive electrode material with low surface lithium ion content. The lithium ion battery positive electrode material is characterized by being prepared from nano oxide and Lix (NiaCobMnc)O2 powder at the mass ratio of 2-12:1000 through mixing and sintering; and the content of free lithium on the surface of the positive electrode material is 1,800ppm or below. According to the method, the surface residual alkali content is reduced by water washing and oxide surface coating modification, the content of free lithium on the surface of the material iscontrolled, meanwhile, the crystal structure of the material can be stabilized, and the cycling stability and the safety performance of the material are improved. According to the method disclosed bythe invention, the whole process flow is simple, and a liquid phase coating method is synchronously carried out in the process of water washing and residual alkali reducing, so that the process flow is simplified; and meanwhile, the liquid-phase coating uniformity is higher, so that the large-scale production can be executed easily.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery cathode material with low lithium ion content on the surface and a preparation method thereof. Background technique [0002] High-capacity layered cathode material Li x (Ni a co b mn c )O 2 (wherein 0.96≤x≤1.04, and a+b+c=1) is one of the most widely researched fields in the key technologies of lithium-ion batteries at present. However, as the nickel content increases, the free lithium content on the surface of the material increases, resulting in a higher residual alkalinity of the material, and its surface structure will be destroyed during the repeated deintercalation of lithium ions, and react with the electrolyte, resulting in poor cycle performance. At the same time, the residual alkali on the surface of the material will cause severe flatulence, which seriously affects the safety performance of the full battery. The mai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 张蒙王兆干陈龙沈中宇
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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