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High-capacity lithium ion battery positive material with core-shell heterostructure and preparation method of material

A cathode material and core-shell structure technology, applied in the field of lithium-ion battery cathode materials, can solve the problems of lithium-rich materials such as large irreversible capacity, small working voltage range, and structural collapse

Inactive Publication Date: 2014-04-30
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reported lithium-rich materials have large irreversible capacity, poor cycle performance, and unsatisfactory rate performance, which limits their competitive advantages and wide application.
Spinel material as high-voltage lithium battery cathode material LiNi x mn 2-x o 4 (0≤x≤0.5) due to its three-dimensional Li + Diffusion channel shows good performance, and has good cycle performance in a certain voltage range, but its discharge specific capacity is low, and the working voltage range is small. For example, at about 2.7V, the John-Teller effect will occur. Leading to the collapse of the structure, it has not been widely used because it does not meet the increasing demand for anode materials with a larger operating voltage range in production

Method used

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  • High-capacity lithium ion battery positive material with core-shell heterostructure and preparation method of material
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  • High-capacity lithium ion battery positive material with core-shell heterostructure and preparation method of material

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Embodiment 1

[0025] A method for preparing a lithium-ion battery positive electrode material with a heterogeneous core-shell structure. The lithium-ion battery positive electrode material is composed of a lithium-rich phase material as a shell material and a spinel phase material as a core material with a core-shell structure. Layered composite material, its chemical formula is 0.5[Li 1.5 Ni 0.25 mn 0.75 o 2.5 ]-0.5 [Li 0.5 Ni 0.25 mn 0.75 o 2 ],Proceed as follows:

[0026] 1) NiSO 4 ·6H 2 O and MnSO 4 ·H 2 O is dissolved in deionized water after mixing, the molar ratio of Ni and Mn is 0.25:0.75, and the obtained concentration is a mixed salt solution of 2mol / L;

[0027] 2) Add 0.2M ammonia water and 2M sodium carbonate solution to the above mixed salt solution under stirring conditions to carry out co-precipitation reaction, and control the flow rate of sodium carbonate solution and ammonia water to make the pH value of the mixed solution 8, and the stirring speed is 600rpm ,...

Embodiment 2

[0035] A preparation method of a lithium-ion battery cathode material with a heterogeneous core-shell structure, the chemical formula of the lithium-ion battery cathode material is 0.5[Li1.5 Ni 0.25 mn 0.75 o 2.5 ]-0.5 [Li 0.5 Ni 0.25 mn 0.75 o 2 ], the preparation steps are substantially the same as in Example 1, difference:

[0036] Combine the nuclear material prepared in step 3) with Li 2 CO 3 After mixing evenly at a molar ratio of 1:0.25, place it in a muffle furnace for calcination at a calcination temperature of 800°C and a calcination time of 15 hours to obtain a high-capacity lithium-ion battery cathode material.

Embodiment 3

[0038] A preparation method of a lithium-ion battery cathode material with a heterogeneous core-shell structure, the chemical formula of the lithium-ion battery cathode material is 0.5[Li 1.5 Ni 0.25 mn 0.75 o 2.5 ]-0.5 [Li 0.5 Ni 0.25 mn 0.75 o 2 ], the preparation steps are substantially the same as in Example 1, difference:

[0039] Combine the nuclear material prepared in step 3) with Li 2 CO 3 After mixing evenly at a molar ratio of 1:0.25, place it in a muffle furnace for calcination at a temperature of 900°C and a calcination time of 15 hours to obtain a high-capacity lithium-ion battery cathode material.

[0040] Figure 5 The XRD pattern of the heterogeneous core-shell structure lithium ion battery cathode material prepared for embodiment 1, 2 and 3 shows in the figure: the structure of the material in embodiment 1, embodiment 2 and embodiment 3 is a spinel phase ( Fd-3m) and the layered phase material (R-3m) structure, when the temperature rises, the (006) / ...

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Abstract

The invention relates to a high-capacity lithium ion battery positive material. The high-capacity lithium ion battery positive material is a laminar composite material with a core-shell structure taking a lithium-rich phase material as a shell material and a spinel phase material as a core material. The preparation method comprises the following steps: performing coprecipitation reaction on nickel-manganese salt-mixture solution, ammonium hydroxide and sodium carbonate solution to obtain manganese carbonate nickel precursor; after uniformity mixing the precursor with a powdered lithium source, calcinating to obtain the powder granular core material with spinel structure; and calcinating after uniformity mixing the core material and Li2CO3, so as to obtain the target object. The high-capacity lithium ion battery positive material provided by the invention has the advantages that the positive material is high in specific capacity, cycling stability and first discharging efficiency, and the preparation technology of the material is good in controllability, low in manufacturing costs, and is suitable for large-scale production, so as to meet the demand on materials with high voltage and high specific capacity in the market.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials of lithium ion batteries, and specifically relates to a lithium battery positive electrode material compounded by using a layered lithium-rich phase as a shell material and a spinel phase as a core material and a preparation method thereof. Background technique [0002] Lithium batteries have been widely used in 3C products such as mobile phones, digital cameras, and notebook computers for 21 years since they were first commercialized by Sony in 1991, and play an important role in people's daily lives. Lithium batteries have the advantages of high capacity, long cycle life, small self-discharge, no memory effect, no environmental pollution and good safety performance. It is an environmentally friendly power supply in the 21st century. With the continuous reduction of international non-renewable energy reserves and the deepening of environmental pollution, the research on bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122C01G45/12C01G53/44H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 张联齐王东阁
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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