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Cobalt-free layered positive electrode material, preparation method thereof, positive electrode sheet and lithium ion battery

A technology for lithium ion batteries and cathode materials, which is applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve the problems of poor conductivity, slow diffusion of lithium ions, and needs to be improved.

Active Publication Date: 2022-04-12
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, because the cobalt-free layered positive electrode material in the related art does not contain cobalt element, its electrical conductivity is poor, and the diffusion rate of lithium ions in the cobalt-free layered positive electrode material is also slow.
[0003] Therefore, the related technologies of the existing cobalt-free layered cathode materials still need to be improved

Method used

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  • Cobalt-free layered positive electrode material, preparation method thereof, positive electrode sheet and lithium ion battery
  • Cobalt-free layered positive electrode material, preparation method thereof, positive electrode sheet and lithium ion battery
  • Cobalt-free layered positive electrode material, preparation method thereof, positive electrode sheet and lithium ion battery

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Embodiment 1

[0072] The cobalt-free layered cathode material includes:

[0073] LiNi 0.75 mn 0.25 o 2 crystal (scanning electron microscope photo see image 3 ); and a lithium ion conductor attached to the LiNi 0.75 mn 0.25 o 2 On at least part of the surface of the crystal, the lithium ion conductor is lithium titanate, based on the total mass of the cobalt-free layered positive electrode material, the mass percentage of the lithium titanate is 0.2%, and the cobalt-free layered positive electrode material The specific surface area of ​​the positive electrode material is 0.7m 2 / g, the particle size of the cobalt-free layered cathode material is 3 μm.

[0074] The scanning electron microscope photo of this cobalt-free layered cathode material is referred to Figure 4 . Depend on image 3 and Figure 4 It can be seen that lithium titanate is attached to at least part of the surface of the cobalt-free layered positive electrode material; and LiNi 0.75 mn 0.25 o 2 The surface of...

Embodiment 2

[0077] The cobalt-free layered cathode material includes:

[0078] LiNi 0.75 mn 0.25 o 2 crystal (scanning electron microscope photo see image 3 ); and a lithium ion conductor attached to the LiNi 0.75 mn 0.25 o 2 On at least part of the surface of the crystal, the lithium ion conductor is lithium manganate, based on the total mass of the cobalt-free layered positive electrode material, the mass percentage of the lithium manganate is 0.15%, and the cobalt-free layered The specific surface area of ​​the positive electrode material is 0.70m 2 / g, the particle size of the cobalt-free layered cathode material is 3 μm.

[0079] The scanning electron microscope photo of this cobalt-free layered cathode material is referred to Figure 5 . Depend on image 3 and Figure 5 It can be seen that lithium manganate is attached to at least part of the surface of the cobalt-free layered positive electrode material; and LiNi 0.75 mn 0.25 o 2 The surface of the crystal is relativ...

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Abstract

The invention provides a cobalt-free layered positive electrode material, a preparation method thereof, a positive electrode sheet and a lithium ion battery. The cobalt-free layered cathode material includes: LiNi x mn y o 2 a crystal, wherein x+y=1, 0.55≤x≤0.95, 0.05≤y≤0.45; and a lithium ion conductor attached to the LiNi x mn y o 2 on at least part of the surface of the crystal. The cobalt-free layered positive electrode material has low cost, low surface resistance, and good conductivity. The diffusion speed of lithium ions in the cobalt-free layered positive electrode material is fast, and the electrochemical activity is high. The charging ratio of the lithium ion battery made by it is High capacity, high discharge specific capacity, high first efficiency, good cycle performance, good rate performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a cobalt-free layered positive electrode material, a preparation method thereof, a positive electrode sheet and a lithium ion battery. Background technique [0002] At present, with the rapid development of the new energy automobile industry, human beings have higher and higher requirements for lithium-ion batteries. Among the four main materials of lithium-ion batteries, positive electrode active materials play a vital role. Among positive electrode active materials in the related art, ternary positive electrode active materials are widely used due to their high capacity, voltage and cycle stability. However, the price of the ternary cathode active material is relatively high due to the presence of a certain amount of cobalt element. Therefore, only by reducing the cobalt content in the ternary positive electrode active material can the cost of the positive elect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/131H01M10/0525H01M10/058C01G53/00
CPCH01M4/505H01M4/525H01M4/131H01M10/0525H01M10/058C01G53/50C01P2004/03C01P2004/61C01P2006/40Y02E60/10Y02P70/50C01P2006/12C01P2004/84H01M4/366H01M2300/0071H01M4/1391H01M4/0471H01M4/62C01P2004/80
Inventor 乔齐齐江卫军许鑫培施泽涛马加力
Owner SVOLT ENERGY TECHNOLOGY CO LTD