Modified spinel type lithium battery cathode material and preparation method thereof

A spinel-type, cathode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as restricting competitive advantages and wide application, unsatisfactory rate performance, and low specific capacity of spinel materials

Inactive Publication Date: 2015-01-28
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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 materials have relatively low specific capacity, and their high-temperature cycle performance and storage performance ...

Method used

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  • Modified spinel type lithium battery cathode material and preparation method thereof
  • Modified spinel type lithium battery cathode material and preparation method thereof
  • Modified spinel type lithium battery cathode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] A modified spinel-type lithium-ion battery positive electrode material is a layered composite material with a core-shell structure composed of a lithium-rich phase material as a shell material and a spinel phase material as a core material, and its chemical formula is 0.1[ Li 1.5 Ni 0.25 mn 0.75 o 2.5 ]-0.9[Li 0.5 Ni 0.25 mn 0.75 o 2 ].

[0033] The preparation method of the modified spinel type lithium ion battery positive electrode material, the steps are as follows:

[0034] 1) NiSO 4 ·6H 2 O and MnSO 4 ·H 2 O mixed and dissolved in deionized water to obtain a mixed salt solution, NiSO in the mixed salt solution 4 ·6H 2 O and MnSO 4 ·H 2 The concentration of O is 2.5mol / L, and the molar ratio of Ni to Mn is 0.25:0.75;

[0035] 2) In the above-mentioned mixed salt solution, under stirring conditions, add a concentration of ammonia solution of 0.25mol / L and a mixed solution of sodium carbonate solution of 2.5mol / L, and the mol ratio of ammonia and sodiu...

Embodiment 2

[0043] A preparation method of a modified spinel type lithium ion battery positive electrode material, the chemical formula of the lithium ion battery positive electrode material is 0.1[Li 1.5 Ni 0.25 mn 0.75 o 2.5 ]-0.9[Li 0.5 Ni 0.25 mn 0.75 o 2 ], the preparation steps are basically the same as in Example 1, except that the roasting time in step 3) is 15h.

Embodiment 3

[0045] A preparation method of a modified spinel type lithium ion battery positive electrode material, the chemical formula of the lithium ion battery positive electrode material is 0.1[Li 1.5 Ni 0.25 mn 0.75 o 2.5 ]-0.9[Li 0.5 Ni 0.25 mn 0.75 o 2 ], the preparation steps are basically the same as in Example 1, except that the calcination temperature in step 3) is 900°C, and the calcination time is 15h.

[0046] Figure 5 The XRD pattern of the modified spinel type 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 all spinel phase (Fd-3m) and layered phase material (R-3m) structure composite, when the temperature rises, the (006) / (102) peak splitting in the material structure is obvious, indicating that the layered phase material in the composite material The layered structure is better, which shows that the temperature affects the structure of the...

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Abstract

The invention relates to a modified spinel type lithium ion battery cathode material, which is a layered composite material with a core-shell structure formed by a spinel phase material as the core material and a lithium-rich phase material as the shell material. The preparation method comprises the steps of carrying out co-precipitation reaction on nickel-manganese mixed salt solution and mixed solution of aqueous ammonia and sodium carbonate to obtain a nickel magnesium carbonate precursor; uniformly mixing the precursor with Li2CO3 according to the stoichiometric ratio, and roasting to obtain a powder granular core material with a spinel structure; uniformly mixing the core material with Li2CO3 according to the stoichiometric ratio, and roasting to obtain the target product. The modified spinel type lithium battery cathode material and the preparation method thereof have the advantages the modified spinel type cathode material is high in specific capacity, high in cycling stability, and high in the first discharge efficiency; the preparation process of the material is excellent in controllability, low in manufacture cost, and good for large-scale production so as to meet the demands for high voltage/high specific capacity materials in the market.

Description

technical field [0001] The invention belongs to the preparation technology of positive electrode materials of lithium ion batteries, in particular to a modified spinel type lithium battery positive electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries are a new generation of secondary batteries after lead-acid batteries, nickel-cadmium batteries and nickel-metal hydride batteries. Today, when the world is facing continuous shortage of oil resources and deteriorating environment, lithium-ion batteries have become a high-tech development due to their advantages such as high capacity, long cycle life, small self-discharge, no memory effect, no environmental pollution and good safety performance. One of the key points, it is considered to be an ideal choice for high-capacity, high-power batteries, and is an environmentally friendly power source in the 21st century. Since its inception, its application range has been continuousl...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/1391H01M4/131
CPCH01M4/131H01M4/1391H01M4/505H01M4/525Y02E60/10
Inventor 张联齐张超
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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