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Lithium ion battery cathode material and preparation method thereof and lithium battery

A technology for lithium ion batteries and cathode materials, applied in the field of materials, can solve the problems of low doping amount, inability to suppress side reactions on the surface of materials, and influence on the electrochemical performance of materials, so as to achieve a simple and easy method of reducing dosage and impact. Effect

Inactive Publication Date: 2020-02-07
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the uniform concentration distribution and small amount of doping, the traditional bulk doping cannot suppress the violent side reaction on the surface of the material; while the traditional coating method often affects the original electrochemical performance of the material because it requires high temperature treatment.

Method used

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  • Lithium ion battery cathode material and preparation method thereof and lithium battery
  • Lithium ion battery cathode material and preparation method thereof and lithium battery
  • Lithium ion battery cathode material and preparation method thereof and lithium battery

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preparation example Construction

[0041] The preparation method of lithium ion battery cathode material of the present invention comprises:

[0042] Synthesizing positive electrode material particles with a gradient doping solid solution on the surface, the doping elements are 4d and 5d metals, and the positive electrode material particles include a positive electrode material precursor or a positive electrode material after phase formation;

[0043] Coating a solid electrolyte membrane on the surface of the positive electrode material particles, the solid electrolyte membrane includes an electrolyte material precursor or a phase-formed electrolyte material;

[0044] Heating the positive electrode material particles or the positive electrode material precursor, the heating temperature is in the range of 300-1200°C;

[0045] The positive electrode material particles coated with the solid electrolyte membrane are heated, and the heating temperature is in the range of 50-500°C.

[0046] specific figure 2 It is...

Embodiment 1

[0057] Ultra-thin Li 1.4 al 0.4 Ti 1.6 (PO 4 ) 3 Preparation of (LATP)-coated W gradient-doped lithium cobalt oxide materials.

[0058] Nano WO 3 Precursor and micron-scale lithium cobalt oxide precursor Co 3 o 4 , Li 2 CO 3 Ball milling at 300 rpm for 1 hour to obtain a uniformly mixed precursor mixture. The resulting mixture was packed in Al 2 o 3 Place the crucible in a muffle furnace, raise the temperature to 500°C at a heating rate of 2°C / min, keep at 500°C for 5 hours, cool to room temperature naturally, and take out the crucible. After grinding the obtained powder with an agate mortar for 2 h, the obtained mixture was loaded again in Al 2 o 3 The crucible was placed in a muffle furnace, and the temperature was raised to 1100 °C at a heating rate of 3 °C / min, and then kept at 1100 °C for 15 hours, then naturally cooled to room temperature, and the crucible was taken out. A positive electrode material with a gradient doped solid solution layer on the surface...

Embodiment 2

[0062] Preparation of Li by Atomic Layer Deposition 1.4 al 0.4 Ti 1.6 (PO 4 ) 3 Preparation of (LATP)-coated W gradient-doped ternary materials.

[0063] Nano WO 3 The precursor and the micron-scale ternary cathode material were ball milled at a speed of 300rpm for 1 hour to obtain a uniformly mixed cathode material and WO 3 mixture. The resulting mixture was packed in Al 2 o 3 The crucible was placed in a muffle furnace, and the temperature was raised to 700°C at a heating rate of 3°C / min. After holding at 700°C for 10 hours, it was naturally cooled to room temperature, and the crucible was taken out to obtain a gradient-doped lithium cobaltate cathode material.

[0064] Spread 1g of gradient-doped positive electrode particles on the substrate, using LATP raw materials Li2CO3, Al2O3, TiO2 and NH4H2PO4 as targets, in a vacuum of 10 -2 torr, voltage 24V, Ar atmosphere, depositing 28 seconds, 8 seconds, 64 seconds and 12 seconds respectively, different raw materials wer...

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Abstract

The invention relates to a lithium ion battery cathode material and a preparation method thereof and a lithium battery. The lithium ion battery cathode material comprises cathode material particles and an inorganic solid electrolyte membrane covering the outer surface of the cathode material particles; doping elements are distributed on the surface of the cathode material particles from outside toinside to form a gradient solid solution layer, and the concentration of the doping elements in the gradient solid solution layer gradually decreases from the surface to the inside; the doping elements are 4d and 5d metals; the outer surface of the cathode material particles is covered with the inorganic solid electrolyte membrane, the inorganic solid electrolyte membrane is a continuous membranehaving a thickness of 1 to 200 nm, the inorganic solid electrolyte membrane comprises an amorphous phase and a crystalline phase that coexist, and the crystalline grain size is in a range of 1 to 40nm. The lithium ion battery cathode material has the advantages of high electrochemical stability, high voltage resistance, good cycle performance, strong structural stability, high safety, and the like.

Description

technical field [0001] The invention relates to the technical field of materials, and more particularly, to a lithium ion battery cathode material, a preparation method thereof, and a lithium battery. Background technique [0002] Clean and efficient energy storage and conversion technology is an important cornerstone of the development of modern society. As one of the energy storage systems with the highest energy conversion efficiency, secondary batteries have received more and more attention. Among many secondary battery systems, lithium-ion batteries have become the best among secondary batteries because of their advantages such as high energy density, low self-discharge rate, wide operating temperature, long cycle life, environmental friendliness, and no memory effect. [0003] With the rapid development of consumer electronics, electric vehicles, smart grids and other fields, people have higher expectations and requirements for the energy density of lithium-ion batteri...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M10/052H01M10/0525H01M4/04
CPCH01M4/0407H01M4/505H01M4/525H01M10/052H01M10/0525Y02E60/10
Inventor 张杰男杨琪禹习谦李泓
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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