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Method for preparing cationic unordered rock salt structure anode material through high-valent-state transition metal ion replacement combination strategies

A technology of transition metal ions and positive electrode materials, applied in structural parts, chemical instruments and methods, manganate/permanganate, etc., to achieve the effect of simple process, conducive to popularization and application, and easy implementation

Inactive Publication Date: 2019-10-25
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One is the redox of nonmetallic anions, corresponding to O 2- →O - and O 2- →O 2 (Voltage>4.0V), there have been relevant literature reports on the influence of non-metallic anions in such materials on the structure and the contribution to the capacity (Chueh, W.C. et al. Metal–oxygen decoordination stabilizes anionredox in Li-richoxides. Nat.Commun.18,256–265(2019).B.Raveau,et al.Lithium-RichRock-Salt-TypeVanadate as Energy Storage Cathode:Li2-xVO3.Chem.Mater.24,12-14(2012).); II It is the redox of transition metal cations. A large part of the high specific capacity of cationic disordered rock-salt structure cathode materials comes from the redox of cations. However, whether the different valence cations of the same transition metal affect the structure of the material and whether they can contribute equally There is no report on related work such as capacity

Method used

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  • Method for preparing cationic unordered rock salt structure anode material through high-valent-state transition metal ion replacement combination strategies
  • Method for preparing cationic unordered rock salt structure anode material through high-valent-state transition metal ion replacement combination strategies
  • Method for preparing cationic unordered rock salt structure anode material through high-valent-state transition metal ion replacement combination strategies

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Example 1: Cationic disordered rock salt structure cathode material Li 1.2 Ti 0.59 mn 0.22 o 2 preparation of

[0029] LiOH and TiO 2 , MnO according to the molar ratio of Li: M: M': F = 1.26: 0.59: 0.22: 0. As for the ball mill tank, dry grinding at a speed of 1450r / min without any medium for 12 hours to obtain a uniformly mixed metal salt precursor body;

[0030] The metal salt precursor was placed in a tube furnace, heated to 900°C at a rate of 2°C / min in an Ar atmosphere, kept for 20 hours, and then naturally cooled to room temperature to obtain a cationic disordered rock salt structure Li 1.2 Ti 0.59 mn 0.22 o 2 Cathode material.

Embodiment 2

[0031] Example 2: Cationic disordered rock salt structure cathode material Li 1.2 Ti 0.37 mn 0.44 o 2 preparation of

[0032] LiOH and TiO 2 , Mn 2 o 3 According to the molar ratio of Li: M: M': F = 1.26: 0.37: 0.44: 0, put it in the ball mill tank, dry mill at a speed of 1450r / min without any medium for 12 hours, and obtain a uniformly mixed metal salt precursor;

[0033] The metal salt precursor was placed in a tube furnace, heated to 900°C at a rate of 2°C / min in an Ar atmosphere, kept for 20 hours, and then naturally cooled to room temperature to obtain a cationic disordered rock salt structure Li 1.2 Ti 0.37 mn 0.44 o 2 Cathode material.

Embodiment 3

[0034] Example 3: Cationic disordered rock salt structure cathode material Li 1.2 Ti 0.55 mn 0.25 o 1.9 f 0.1 preparation of

[0035] LiOH and TiO 2, MnO, LiF according to the molar ratio of Li: M: M': F = 1.26: 0.55: 0.25: 0.1 in the ball mill tank, dry grinding at 1450r / min without any medium for 12 hours to obtain a uniformly mixed metal salt precursor;

[0036] Put the metal salt precursor in a tube furnace, raise the temperature to 950°C at a rate of 2°C / min in an Ar atmosphere, heat it for 15 hours, and then cool it down to room temperature naturally to obtain Li with a cationic disordered rock salt structure. 1.2 Ti 0.55 mn 0.25 o 1.9 f 0.1 Cathode material.

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Abstract

The invention discloses a method for preparing a cationic unordered rock salt structure anode material through high-valent-state transition metal ion replacement combination strategies. A lithium saltis mixed with oxides of high-valent-state transition metal elements M (one of more of Ti, V2, Nb, Mo and Zr), oxides of M' (one or more of Fe, Ni and Mn) and villiaumite through a solid-phase ball milling method, and then through high-temperature treatment, the cationic unordered rock salt structure anode material is obtained. The prepared anode material has the high charge and discharge specificcapacity and cyclic stability, and the preparation method is simple in process and easy to implement, and application and popularization are facilitated.

Description

technical field [0001] The invention relates to the field of new energy materials, in particular to a method for preparing a cathode material with a cationic disordered rock salt structure for a lithium ion battery. Background technique [0002] With the rapid development of science and technology, the living standards of human beings continue to improve, and the convenience and miniaturization of electronic equipment gradually enter people's daily life. high demands. Therefore, the development of new cathode materials with high voltage and high specific capacity is the key to further improving the energy density of lithium-ion batteries. [0003] At present, the widely used cathode materials for lithium-ion batteries are often oxides with ordered close-packed arrangements, such as typical spinel structures and layered lithium-ion transition metal oxides. Researchers generally believe that the cathode materials An ordered structure is a necessary condition for obtaining hi...

Claims

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Application Information

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IPC IPC(8): C01G45/12H01M4/485H01M4/505H01M4/525
CPCC01G45/1221C01P2002/72C01P2004/03C01P2004/04C01P2004/61C01P2004/62H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 张卫新唐伟建杨则恒陈章贤
Owner HEFEI UNIV OF TECH
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