Method for modifying lithium nickel manganate by replacing Mn with doped P non-equivalently, and application of modified lithium nickel manganate

A lithium nickel manganese oxide, unequal technology, applied in the field of preparation of modified lithium nickel manganese oxide, can solve the problems of poor high-temperature cycle performance, poor cycle performance, and restrictions on wide application, and achieve high tap density and low cost , the effect of high purity

Active Publication Date: 2018-01-19
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to Mn 3+ Disproportionation reaction and Jahn-Teller effect, the poor cycle performance of this material, especially the poor cycle performance at high temperature, severely limits its wide application

Method used

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  • Method for modifying lithium nickel manganate by replacing Mn with doped P non-equivalently, and application of modified lithium nickel manganate
  • Method for modifying lithium nickel manganate by replacing Mn with doped P non-equivalently, and application of modified lithium nickel manganate
  • Method for modifying lithium nickel manganate by replacing Mn with doped P non-equivalently, and application of modified lithium nickel manganate

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0042] Add 0.08mol of citric acid to 100ml of deionized water, and after the citric acid is dissolved, add 0.043125mol of elemental manganese powder, 0.015mol of nickel acetate, 0.0315mol of lithium acetate and 0.0015mol of diammonium hydrogen phosphate; The solution was magnetically stirred at room temperature for 5 hours; the mixed solution was evaporated to dryness with magnetic stirring at a constant temperature of 80°C to obtain a precursor; the above precursor was pre-decomposed at 230°C for 4 hours, and the obtained pre-decomposed product was ground to obtain a ground product The grinding product is subjected to two-step heat treatment under air atmosphere conditions, and the two-step heat treatment conditions are temperature 650°C, time 10h and temperature 900°C, time 2h, and then cooling with the furnace to obtain high-performance P non-equal doping Lithium nickel manganese oxide lithium ion battery cathode material.

[0043] see figure 1 , X-ray powder diffraction a...

Embodiment 2

[0047] Add 0.06mol of citric acid to 100ml of deionized water, and after the citric acid is dissolved, add 0.043125mol of elemental manganese powder, 0.015mol of nickel acetate, 0.0315mol of lithium acetate and 0.0015mol of diammonium hydrogen phosphate; The solution was magnetically stirred at room temperature for 5 hours; the mixed solution was evaporated to dryness with magnetic stirring at a constant temperature of 80°C to obtain a precursor; the above precursor was pre-decomposed at 230°C for 4 hours, and the pre-decomposed product was ground to obtain a ground Product; the ground product is subjected to two-step heat treatment under air atmosphere conditions, the treatment conditions are 650 ° C for 10 h and 900 ° C for 2 h, and then cooled with the furnace to obtain a high-performance P non-equal doped nickel manganese oxide lithium ion battery positive electrode Material.

[0048] X-ray powder diffraction analysis shows that the product is a pure-phase lithium nickel m...

Embodiment 3

[0050] Add 0.10mol of citric acid to 100ml of deionized water, and after the citric acid is dissolved, add 0.043125mol of elemental manganese powder, 0.015mol of nickel acetate, 0.0315mol of lithium acetate and 0.0015mol of diammonium hydrogen phosphate; The solution was magnetically stirred at room temperature for 5 hours; the mixed solution was evaporated to dryness with magnetic stirring at a constant temperature of 80°C to obtain a precursor; the above precursor was pre-decomposed at 230°C for 4 hours, and the pre-decomposed product was ground to obtain a ground Product; the ground product is subjected to two-step heat treatment under air atmosphere conditions, the treatment conditions are 650 ° C for 10 h and 900 ° C for 2 h, and then cooled with the furnace to obtain a high-performance P non-equal doped nickel manganese oxide lithium ion battery positive electrode Material.

[0051] X-ray powder diffraction analysis shows that the product is a pure-phase lithium nickel m...

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Abstract

The invention provides a method for modifying lithium nickel manganate by replacing Mn with doped P non-equivalently. A non-metal element P is adopted to replace a small amount of Mn non-equivalentlyto realize doping modification of LiNi<0.5>Mn<1.5>O<4>; and by introducing a small amount of vacancy to the 16d position to adjust content of oxygen vacancy in the material, the ratio of ordered and disordered spinel structures in the material can be optimized. In the preparation process, citric acid is dissolved into a proper amount of deionized water firstly; next, a lithium source, a manganesesource, a nickel source and a phosphorus source are added in sequence to obtain a mixed solution; and heating and stirring are performed until the mixed solution is dried through evaporation, and next, pre-decomposition and thermal treatment are performed to obtain the P non-equivalently doped lithium nickel manganate. The P non-equivalently doped and modified lithium nickel manganate prepared bythe invention is high in tap density and purity, free of impurity phase, and quite high in rate capability and cycle performance; the capacity retention ratio is about 93% at 10C rate after 1,000 cycles; and the capacity retention ratio still can be as high as 87% after 1,600 cycles.

Description

technical field [0001] The invention belongs to the field of energy materials, and in particular relates to a preparation method and application of modified lithium nickel manganese oxide. Background technique [0002] Mn-based spinel-structured cathode materials are considered to be one of the most attractive cathode materials for lithium-ion batteries due to their abundant resources, high discharge voltage, and environmental friendliness. Due to Mn 3+ Due to the disproportionation reaction and the Jahn-Teller effect, the poor cycle performance of this material, especially the poor cycle performance at high temperature, severely limits its wide application. In addition, its rate performance needs to be further improved to meet the high power output requirements of electric vehicles. The positive electrode material with spinel structure mainly includes lithium manganese oxide LiMn 2 o 4 And lithium nickel manganese oxide LiNi 0.5 mn 1.5 o 4 Wait. LiNi 0.5 mn 1.5 o ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCY02E60/10
Inventor 褚卫国刘海强张娟王汉夫
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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