Conductive material modified composite lithium-rich positive electrode and preparation method and application thereof

A technology of conductive materials and lithium-rich cathode materials, applied in electrode manufacturing, positive electrodes, battery electrodes, etc., can solve problems such as uneven material mixing and large particle size, achieve excellent rate performance, stable chemical properties, and improve rate performance Effect

Pending Publication Date: 2022-05-10
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present invention provides a preparation method of a conductive material-modified composite lithium-rich positive electrode, which aims to solve the problems of uneven mixing of various substances and large particle size during the coating and doping of existing conductive materials.

Method used

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  • Conductive material modified composite lithium-rich positive electrode and preparation method and application thereof
  • Conductive material modified composite lithium-rich positive electrode and preparation method and application thereof
  • Conductive material modified composite lithium-rich positive electrode and preparation method and application thereof

Examples

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Embodiment 1

[0031] This example provides a carbon-modified lithium-rich manganese-based (Li 1.2 mn 0.54 Ni 0.13 co 0.13 o 2 ) composite lithium-rich cathode and a preparation method thereof.

[0032] Carbon-modified lithium-rich manganese-based (Li 1.2 mn 0.54 Ni 0.13 co 0.13 o 2 ) The preparation method of the composite lithium-rich positive electrode is: using a high-purity carbon target material and a lithium-rich manganese base (Li 1.2 mn 0.54 Ni 0.13 co 0.13 o 2 ) powder target as the deposition source, co-deposition on aluminum foil, the target base distance is 80mm; at 1.0×10 -2 Carbon-modified lithium-rich manganese (Li 1.2 mn 0.54 Ni 0.13 co 0.13 o 2 ) composite lithium-rich positive electrode, during deposition, keep the substrate at 550°C, and anneal at 500°C for 2 hours after deposition.

Embodiment 2

[0034] This embodiment provides germanium-modified lithium-rich manganese-based (Li 1.2 mn 0.6 Ni 0.2 o 2 ) composite lithium-rich cathode and a preparation method thereof.

[0035] Ge-modified lithium-rich manganese-based (Li 1.2 mn 0.6 Ni 0.2 o 2 ) The preparation method of the composite lithium-rich positive electrode is: using a high-purity germanium target material and a lithium-rich manganese base (Li 1.2 mn 0.6 Ni 0.2 o 2 ) powder target as the deposition source, co-deposition on aluminum foil, the target base distance is 60mm, at 1.0×10 -2 Ge-modified lithium-rich manganese (Li 1.2 mn 0.6 Ni 0.2 o 2 ) composite solid positive electrode, during the deposition, the substrate is kept at 450°C, and annealed at 500°C for 2 hours after the deposition is completed.

Embodiment 3

[0037] This example provides a tin-modified lithium-rich manganese-based (Li 2 MnO 3 ) composite solid positive electrode and its preparation method.

[0038] Tin-modified lithium-rich manganese-based (Li 2 MnO 3 ) The preparation method of the composite solid positive electrode is as follows: high-purity tin target material and lithium-rich manganese-based powder target material are used as deposition sources, co-deposited on aluminum foil, the target-base distance is 70mm, at 1.0×10 -2 Sn-modified lithium-rich manganese (Li-rich manganese-based (Li 2 MnO 3) composite solid positive electrode, during the deposition, the substrate is kept at 300°C, and annealed at 400°C for 1 hour after the deposition is completed.

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Abstract

The invention is suitable for the technical field of chemical power sources, and provides a conductive material modified lithium-rich positive electrode and a preparation method and application thereof.The preparation method comprises the steps that a conductive material target material and a lithium-rich positive electrode material target material are subjected to co-deposition treatment in the mixed atmosphere of working gas and oxygen, a composite lithium-rich material grows on a substrate, and the composite lithium-rich positive electrode is obtained; and annealing to obtain the modified lithium-rich positive electrode. According to the preparation method, uniform compounding is achieved on the nanoscale through codeposition treatment, meanwhile, the placed conductive material forms a good three-dimensional conductive network in the pole piece, and the effect of a buffer structure is achieved while a stable CEI film is formed through induction. The modified lithium-rich positive electrode has high energy storage density and high reversible capacity, and the conductive material compounded in the modified lithium-rich positive electrode is used as a good electronic conductor, so that the resistance of a solid-state electrode can be greatly reduced, and the rate capability of the battery is improved. The energy density of the lithium ion battery assembled by the modified lithium-rich positive electrode and the silicon-carbon negative electrode is higher than 350Wh / kg, the voltage interval is 2-5V, and the safety of the battery is good.

Description

technical field [0001] The invention belongs to the technical field of chemical power sources, and in particular relates to a composite lithium-rich positive electrode modified by a conductive material and a preparation method and application thereof. Background technique [0002] Due to the popularity of portable electronic devices such as mobile phones and notebooks, lithium-ion batteries have been favored by manufacturers and customers. As one of the most promising secondary energy sources, this renewable energy source has become the first choice due to its high voltage, outstanding energy density, no memory effect, and environmental protection. Cathode material is one of the key factors affecting the performance of LIBs. Therefore, research focuses on optimizing cathode materials for practical applications. Most of the existing commercial lithium-ion battery cathode materials are lithium cobaltate, lithium iron phosphate, and ternary materials. Due to the popularity of...

Claims

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Application Information

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IPC IPC(8): H01M4/131H01M4/04H01M4/1391H01M4/62H01M10/0525H01M4/505H01G11/86H01G11/50
CPCH01M4/131H01M4/0426H01M4/0423H01M4/626H01M4/625H01M10/0525H01M4/505H01M4/1391H01G11/50H01G11/86H01M2004/028
Inventor 俞兆喆余康哲周利航路权王岳振程燕
Owner GUILIN UNIV OF ELECTRONIC TECH
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