Magnesium-containing lithium-rich manganese-based positive electrode and preparation method thereof

A magnesium-rich lithium-manganese-based and lithium-rich manganese-based technology is applied to the field of magnesium-containing lithium-rich manganese-based positive electrodes and their preparation, which can solve the problems of poor capacity retention performance and instability of lithium-rich materials, and avoid irreversible damage. The effect of increasing conductivity and tightness, avoiding side reactions

Active Publication Date: 2020-06-19
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem of poor capacity retention of existing lithium-rich materials, and to provide a magnesium-containing lithium-rich manganese-based positive electrode, which has extremely high cycle stability
[0007] The present invention starts from the electrode manufacturing process, uses the electrode preparation process, and utilizes magnesium to realize the dynamic protection of the lithium-rich manganese-based material in the charging and discharging process, and solves the instability of the lithium-rich manganese-based material structure in the charging and discharging process from the electrode level problem, improve electrochemical performance

Method used

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  • Magnesium-containing lithium-rich manganese-based positive electrode and preparation method thereof
  • Magnesium-containing lithium-rich manganese-based positive electrode and preparation method thereof
  • Magnesium-containing lithium-rich manganese-based positive electrode and preparation method thereof

Examples

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Effect test

Embodiment 1

[0034] Example 1: Magnesium-containing lithium-rich manganese-based positive electrode using magnesium sulfate as the source of magnesium, magnesium accounts for 2% of the mass of the lithium-rich material

[0035] This example involves the preparation of a magnesium-containing lithium-rich manganese-based positive electrode using magnesium sulfate as a magnesium source, wherein the magnesium element accounts for 2% of the mass of the lithium-rich material, and is cycled with a lithium-rich positive electrode that uses the same preparation method but does not add magnesium sulfate Performance comparison.

[0036] details as follows:

[0037] (1) Take a ball mill jar and several zirconium beads of different sizes. Add 50 mg of lithium-rich material into the tank, magnesium sulfate is added according to 2% of the mass of the lithium-rich material, conductive carbon black is added according to 12% of the mass of the lithium-rich material, and LA binder is added according to 12% ...

Embodiment 2

[0044] Example 2: Magnesium-containing lithium-rich manganese-based positive electrode using magnesium oxide as the source of magnesium, magnesium accounts for 2% of the mass of the lithium-rich material

[0045] This embodiment relates to the cycle performance test of a magnesium-containing lithium-rich manganese-based positive electrode using magnesium oxide as a magnesium source, wherein the magnesium element accounts for 2% of the mass of the lithium-rich material.

[0046] The difference between this example and Example 1 is that the magnesium source used in the magnesium-containing lithium-rich positive electrode is magnesium oxide.

[0047] image 3 It is the first-cycle charge-discharge curve of the magnesium-containing lithium-rich manganese-based positive electrode (the magnesium source is magnesium oxide, and the mass ratio of magnesium to the lithium-rich material is 2%) at a current density of 20mA / g. The first-cycle charge specific capacity is 298.9mAh / g, and th...

Embodiment 3

[0049] Example 3: Magnesium-containing lithium-rich manganese-based positive electrode using magnesium sulfate as the source of magnesium, magnesium accounts for 7% of the mass of the lithium-rich material

[0050] This example relates to the cycle performance test of a magnesium-containing lithium-rich manganese-based positive electrode using magnesium sulfate as a magnesium source, wherein the magnesium element accounts for 7% of the mass of the lithium-rich material.

[0051] The difference between this example and Example 1 is that the magnesium element used in the magnesium-containing lithium-rich positive electrode accounts for 7% of the mass of the lithium-rich material.

[0052] Figure 5 It is the first-cycle charge-discharge curve of the magnesium-containing lithium-rich manganese-based positive electrode (the magnesium source is magnesium sulfate, and the mass ratio of magnesium to the lithium-rich material is 7%) at a current density of 20mA / g. The first charge sp...

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Abstract

The invention relates to a magnesium-containing lithium-rich manganese-based positive electrode and a preparation method thereof. The magnesium-containing lithium-rich manganese-based positive electrode comprises a current collector and an active material, the active material is attached to the current collector, the active material comprises a lithium-rich manganese-based positive electrode material xLi2MnO3. (1-x) LiMO2, wherein M is a transition metal element, and x is greater than 0 and less than 1; a magnesium simple substance or a magnesium compound, a conductive agent and a binder, wherein the mass of the magnesium elementary substance or the mass of magnesium in the magnesium compound is 0.1%-10% of the mass of the lithium-rich manganese-based positive electrode material. The activation of the manganese element of the lithium ion battery prepared from the magnesium-containing lithium-rich manganese-based positive electrode is inhibited in the first-circle charging process, andthe lithium ion battery has extremely high cycling stability.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a magnesium-containing lithium-rich manganese-based positive electrode and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used in all walks of life. The development of both smart grids and electric vehicles is largely restricted by the development of lithium-ion battery technology. Among many lithium-ion battery cathode materials, such as Layered Lithium Cobalt Oxide LiCoO 2 、LiNi 1-x-y co x mn y o 2 and Li-rich materials (xLi 2 MnO 3 ·(1-x)LiMO 2 , M is a transition metal element, 0<x<1), compared with other traditional cathode materials, lithium-rich materials have the characteristics of higher discharge specific capacity (>250mAh / g) and high discharge voltage, and are cheap to use in large quantities Non-toxic manganese, compared to the toxic LiCoO with higher cobalt content 2 and LiNi 1-x-y co x...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M4/131H01M4/1391H01M4/04H01M10/052H01M10/0525
CPCH01M4/0404H01M4/131H01M4/1391H01M4/362H01M4/505H01M4/525H01M4/62H01M4/628H01M10/052H01M10/0525Y02E60/10
Inventor 董全峰薛嘉熙郑明森范镜敏
Owner XIAMEN UNIV
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