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A kind of lithium ion cathode material with surface coating metal nitride and preparation method thereof

A positive electrode material and surface coating technology, which is applied in the field of lithium ion positive electrode material coated with nitride on the surface and its preparation, to achieve the effects of stable material structure, uniform coating layer and simple preparation process

Active Publication Date: 2019-12-13
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It has been reported in the literature that metal nitrides were obtained from metal oxides through ammonia nitriding (Li Jingguo et al., Preparation of Nano-Titanium Nitride Powder and Its Influencing Factors. Journal of Inorganic Materials. 18(2003) 765-771)) , but has not yet been applied to the lithium battery material industry

Method used

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  • A kind of lithium ion cathode material with surface coating metal nitride and preparation method thereof
  • A kind of lithium ion cathode material with surface coating metal nitride and preparation method thereof
  • A kind of lithium ion cathode material with surface coating metal nitride and preparation method thereof

Examples

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Effect test

Embodiment 1

[0033] Metal nitride coated Li(Ni 0.8 co 0.1 mn 0.1 )O 2

[0034] Take 20g Li(Ni 0.8 co 0.1 mn 0.1 )O 2 and 0.2gTiO 2 (Addition amount 1wt.%) After ball milling and mixing, put the powder in a tube-type atmosphere furnace, ventilate the air atmosphere, heat to 500°C for 3 hours, switch to nitrogen to replace the air, ventilate for 0.5 hours, and then switch to ammonia atmosphere , holding for 1.5h to obtain NiN, MnN, CoN and Ti-O-N metal nitride coated Li(Ni 0.8 co 0.1 mn 0.1 )O 2 . The electrochemical properties of the materials are listed in Table 1. The half-cell performance results of materials before and after coating are as follows: figure 2 shown. Before coating, the 0.1C capacity of the material reaches 188.2mAh / g. After coating, the 0.1C capacity of the material reached 190.9mAh / g; in terms of rate, the capacity of the coated material at 3C reached 139.2mAh / g, higher than the 130.2mAh / g before modification, and the rate performance was significantly i...

Embodiment 2

[0036] Metal nitride coated Li(Ni 0.5 co 0.2 mn 0.3 )O 2

[0037] Take 20g Li(Ni 0.8 co 0.1 mn 0.1 )O 2 and 0.1gTiO 2(addition amount 0.05wt.%) After ball milling and mixing, put the powder in a tube-type atmosphere furnace, ventilate the air atmosphere, heat to 500 ° C for 3 hours, switch to argon to replace the air, ventilate for 0.5 hours, and then switch to ammonia gas atmosphere, holding for 0.5h to obtain NiN, MnN, CoN and Ti-O-N metal nitride-coated Li(Ni 0.5 co 0.2 mn 0.3 )O 2 . The electrochemical properties of the materials are listed in Table 1.

Embodiment 3

[0039] Metal nitride coated Li(Ni 0.85 co 0.1 al 0.05 )O 2

[0040] Take 20g Li(Ni 0.85 co 0.1 al 0.05 )O 2 and 0.4gTiO 2 (Addition amount 2wt.%) After high-speed stirring and mixing, place the powder in a tube-type atmosphere furnace, ventilate the air atmosphere, heat to 600 ° C for 2 hours, switch to nitrogen to replace the air, ventilate for 1 hour, and then switch to ammonia atmosphere , holding for 1.5h to obtain NiN, AlN, CoN and Ti-O-N metal nitride coated Li(Ni 0.85 co 0.1 al 0.05 )O 2 . The electrochemical properties of the materials are listed in Table 1.

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Abstract

The invention belongs to the field of lithium ion batteries, and particularly relates to a lithium ion anode material coated with metal nitride on the surface and a preparation method thereof. The lithium ion anode material is composed of a lithium ion anode material body and the metal nitride, wherein the metal nitride uniformly coats the surface of the anode material body. The preparation method comprises the following steps of (1) uniformly mixing the lithium ion anode material body with TiO2 according to a certain proportion; (2) performing heat treatment on a mixture in different atmospheres step by step: firstly, sintering in an oxidizing atmosphere, secondly, replacing furnace gas in an inert atmosphere, and thirdly, sintering in an ammonia atmosphere, so that the lithium ion anode material coated with the nitride on the surface is obtained. The method has the advantages of simplicity and convenience, the cycling stability and electronic conductivity of the lithium ion anode material can be increased after coating, and the electrochemical performance of a battery is improved.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a lithium ion positive electrode material coated with nitride on the surface and a preparation method thereof. Background technique [0002] Looking for lithium-ion battery technology with higher energy density, longer cycle life and better safety performance is the main direction of future development. Cathode material is one of the most critical materials that determine the above three elements. The most promising cathode materials include layered electrode materials Li(Ni x co y mn 1-x-y )O 2 (0<x<1, 0<y<1), Li(Ni x co y al 1-x-y )O 2 (0<x<1, 0<y<1), LiNi x co 1-x o 2 (0≤x≤1), lithium-rich manganese-based electrode material xLi 2 MnO 3 ·(1-x)LiMO 2 (0<x<1, M is one or more of Mn, Ni, Co), and LiNi of high voltage route 0.5 mn 1.5 o 4 . [0003] In these electrode materials, there are problems of interface and struc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/62H01M10/0525
CPCH01M4/362H01M4/62H01M4/624H01M10/0525Y02E60/10
Inventor 陈龙李道聪
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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