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Surface modification method of anode material of lithium ion battery

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problem of low conductivity of ceria, achieve simple hydrophobic treatment methods, improve conductivity, and maintain stability Effect

Active Publication Date: 2016-05-11
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conductivity of conventional ceria is not high, but when it reaches the nanometer level, its conductivity increases by nearly four orders of magnitude

Method used

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  • Surface modification method of anode material of lithium ion battery
  • Surface modification method of anode material of lithium ion battery
  • Surface modification method of anode material of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: Preparation doped nano ceria coated Li 1.2 mn 0.56 Ni 0.16 co 0.08 o 2

[0031] The finely ground lithium-rich manganese-based cathode material Li 1.2 mn 0.56 Ni 0.16 co 0.08 o 2 Add in the mixed solution that is made up of cerium nitrate and neodymium nitrate, the concentration of cerium nitrate in the mixed solution is 0.02mol / L, cerium element accounts for 2% of the total mass of positive electrode material, and neodymium element accounts for 0.2% of the total mass of positive electrode material; Mix ammonia water with a concentration of 2 mol / L, ultrasonicate the mixed solution for 10 minutes, place it at room temperature for 2 hours, then raise the temperature to 80°C and stir to completely evaporate the water to dryness, and finally place it in an oven at 80°C Dry for 12 hours to obtain a dry sample;

[0032]Press the dry sample into a sheet-like sample, then put the sheet-like sample into a tube furnace, pre-flow oxygen into the tube furna...

Embodiment 2

[0035] Example 2: Preparation of LiMn coated with nanometer ceria 0.2 Ni 0.6 co 0.2 o 2 (NCM-622)

[0036] The ground LiMn 0.2 Ni 0.6 co 0.2 o 2 Add to the mixed solution composed of cerium nitrate and neodymium nitrate, the concentration of cerium nitrate in the mixed solution is 0.01mol / L, the cerium element accounts for 1% of the total mass of the positive electrode material, and the neodymium element accounts for 0.5% of the total mass of the positive electrode material; Ammonia water with a concentration of 2mol / L was mixed, and the mixed solution was ultrasonically treated for 10 minutes, then left at room temperature for 2 hours, then stirred at 60°C until dry, and finally dried in an oven at 100°C for 10 hours to obtain a dry sample;

[0037] Press the dry sample into a sheet-like sample, and then put the sheet-like sample into a tube furnace. Oxygen is passed into the tube furnace for 1 hour in advance, and then the temperature is raised to 400°C at 2°C / min for...

Embodiment 3

[0038] Example 3: Preparation of LiNi coated with nanometer ceria 0.78 co 0.19 al 0.03 o 2 (NCA)

[0039] The ground LiNi 0.78 co 0.19 al 0.03 o 2 Add it to the mixed solution composed of cerium nitrate and neodymium nitrate, the concentration of cerium nitrate in the mixed solution is 0.02mol / L, the cerium element accounts for 0.25% of the total mass of the positive electrode material, and the neodymium element accounts for 0.025% of the total mass of the positive electrode material. Ammonia water with a concentration of 2mol / L was mixed, and the mixed solution was ultrasonically treated for 5 minutes, then left at room temperature for 1 hour, then stirred at 80°C until dry, and finally dried in an oven at 120°C for 6 hours to obtain a dry sample;

[0040] Press the dry sample into a sheet-like sample, then put the sheet-like sample into a tube furnace, pre-flow oxygen into the tube furnace for 1h, then raise the temperature to 500°C at 2°C / min and maintain it for 10h,...

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Abstract

The invention discloses a surface modification method of an anode material of a lithium ion battery. The surface modification method comprises the following steps of adding a smashed anode material of the lithium ion battery into a mixed solution prepared from cerium nitrate and neodymium nitrate, carrying out ultrasonic stirring after mixing by adding ammonium hydroxide, evaporating water and drying; pressing a dried sample into a flaky product after grinding and smashing the dried product, putting the flaky sample into a tubular furnace in which oxygen is continuously pumped, rising the temperature, calcining in the oxygen, then calcining in argon, and obtaining a finished product. According to the surface modification method disclosed by the invention, the anode material of the lithium ion battery is coated and modified through neodymium-doped nano cerium dioxide, so that the structure stability is maintained, the first cycle efficiency is increased, oxygen deficiency caused by disembedding of lithium ions is filled, and the structure stability of the anode material is maintained; meanwhile, a coating object has higher water absorbing resistance after being subjected to surface hydrophobization treatment.

Description

technical field [0001] The patent of the present invention relates to the technical field of lithium ion batteries, in particular to a method for surface modification of positive electrode materials of lithium ion batteries. Background technique [0002] Among the current secondary batteries, lithium-ion batteries have unique advantages such as high working voltage, high energy density, long cycle life, low self-discharge, and no memory effect, so they have been widely used and promoted. The current commercialized LiCoO 2 、LiFePO 4 , LiMn 2 o 4 The discharge capacity of the positive electrode materials of lithium-ion batteries is lower than 200mAh / g. Now there is an urgent need to develop high-energy-density electrode materials to meet the needs of modernization. Lithium-rich and high-nickel ternary materials are ideal choices. [0003] Lithium-rich manganese-based cathode materials have a high energy density and a discharge specific capacity twice that of the current ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M4/131H01M4/1391H01M10/0525
CPCH01M4/131H01M4/1391H01M4/362H01M4/505H01M4/525H01M4/626H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 高玉仙
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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