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A lithium-ion battery electrode material with surface phase change modification and its preparation method and application

A modified material, lithium ion technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as affecting battery rate performance, hindering lithium ion and electron transmission, increasing battery impedance, etc., to facilitate large-scale preparation, The effect of suppressing surface side reactions and improving stability

Active Publication Date: 2020-08-21
INST OF CHEM CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the electrochemically inert coating layer will hinder the transport of lithium ions and electrons, increase the impedance of the battery, and affect the rate performance of the battery.

Method used

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  • A lithium-ion battery electrode material with surface phase change modification and its preparation method and application
  • A lithium-ion battery electrode material with surface phase change modification and its preparation method and application
  • A lithium-ion battery electrode material with surface phase change modification and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] 1. Preparation of lithium nickel manganate with surface phase change

[0055] Take 0.5g lithium nickel manganese oxide (LiNi 0.5 Mn 1.5 O 4 ) Powder, 30mg zinc source zinc acetate dihydrate, 0.1g precipitant urotropine were dispersed in 30mL water, and adjusted the pH to 7, stirred at 90°C for 4h, centrifuged, washed, and dried to obtain an intermediate product; The prepared intermediate product is placed in a muffle furnace and heated to 750°C at a heating rate of 8°C / min and calcined for 4 hours to obtain a core-shell-like lithium nickel manganate with a surface phase change.

[0056] figure 1 It is the structure of the original lithium nickel manganese oxide. It can be seen that the atoms are arranged in a typical rhomboid shape, indicating that the original lithium nickel manganese oxide material has a spinel phase structure.

[0057] figure 2 It is the structure of lithium nickel manganate after surface phase change. It can be seen that the surface structure has complet...

Embodiment 2

[0066] 1. Preparation of lithium manganate with surface phase change

[0067] Take 0.5g lithium manganate (LiMn 2 O 4 ) Powder, 50mg of iron source ferric chloride hexahydrate, 0.2g of precipitant urea were dispersed in 30mL of water, stirred at 60°C for 4h, then centrifuged, washed, and dried to obtain an intermediate product; the prepared intermediate product was placed in a muffle In the furnace, the temperature is increased to 800°C at a temperature increase rate of 10°C / min and calcined for 4 hours to obtain lithium manganate with a surface phase change.

[0068] Figure 4 It is the surface structure of lithium manganate with surface phase change. It can be seen that part of the spinel phase on the surface is transformed into a rock salt-like phase, which can improve the surface stability of the material, while the other part of the spinel phase that has not been transformed can ensure the migration of lithium ions and electrons.

[0069] 2. Preparation of lithium manganate ele...

Embodiment 3

[0077] 1. Preparation of lithium titanate with surface phase change

[0078] Take 0.5g lithium titanate (Li 4 Ti 5 O 12 ) Powder, 40mg copper source copper chloride dihydrate, 0.2g precipitant urea were dispersed in 30mL water, adjusted pH=7, stirred at 85℃ for 4h, centrifuged, washed, and dried to obtain the intermediate product; the prepared intermediate The product is placed in a muffle furnace and heated to 850°C at a heating rate of 10°C / min and calcined for 5 hours to obtain lithium titanate with a surface phase change.

[0079] 2. Preparation of lithium titanate electrode with surface phase change

[0080] Take 0.24g of the surface phase-change lithium titanate powder prepared above, mix it with 0.03g conductive additive super-p, 0.03g binder PVDF and a little solvent NMP, then pulp, smear (aluminum foil as current collector), and dry , A lithium titanate electrode with surface phase change is obtained.

[0081] Testing the surface structure of the lithium titanate with the su...

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Abstract

The invention provides a surface phase change modified lithium ion battery electrode material and a preparation method and application thereof. The material is provided with a core-shell-like structure, the core-shell-like structure is formed by the inner portion and surface layer of lithium metal oxide, that is, the inner portion of the lithium metal oxide is a core, and the surface layer of thelithium metal oxide is a shell; the surface layer contains at least two phase structures, wherein one phase structure can ensure the migration of lithium ions and electrons, and the other phase structure can improve the stability of the material surface. The surface phase change modified lithium ion battery electrode material and the preparation method and application thereof have the advantages that the stability of the electrode material can be improved on the premise of ensuring the migration of the lithium ions and electrons after modification; the synthetic route of the method is simple,the synthesis period is short, the large-scale preparation is convenient, the synthesis method is low in cost, high in efficiency, safe and pollution-free, and is an ideal modification method of the lithium ion battery electrode material.

Description

Technical field [0001] The invention belongs to the technical field of lithium ion battery electrode materials, and particularly relates to a surface phase change modified lithium ion battery electrode material, and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries are currently the most stable and efficient energy storage devices, and have been widely used in 3C electronics and automotive power batteries. Among them, electrode materials are widely regarded as the bottleneck of lithium-ion batteries. The development of high-energy-density lithium-ion battery electrode materials is critical to improving the performance of lithium-ion batteries. Currently, practical electrode materials, cathode materials mainly include layered materials (such as lithium cobalt oxide, ternary materials), spinel materials (such as lithium manganate, lithium nickel manganate), and polyanionic materials (such as iron phosphate Lithium) and so on; negati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 曹安民朴俊宇万立骏
Owner INST OF CHEM CHINESE ACAD OF SCI
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