Lithium-rich manganese-based layered positive electrode material and preparation method therefor

A positive electrode material, lithium-rich manganese technology, applied in the field of lithium-rich manganese-based layered positive electrode materials and its preparation, can solve the problems of aggravated side reactions between positive electrode materials and electrolytes, decreased electrochemical performance, and material performance degradation, and achieve improved battery performance. Chemical properties, good structural consistency, low voltage drop effect

Inactive Publication Date: 2017-11-17
CHINA ELECTRIC POWER RES INST +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The reason for its structure is that the Coulombic efficiency is low in the first week; although the lithium-rich layered material can release a high specific capacity at a low rate, the specific capacity of the lithium-rich layered material decreases rapidly at a high rate, which affects its Application in high-rate discharge equipment; the particularity of its structure, the migration of Mn during the charge-discharge cycle, res

Method used

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  • Lithium-rich manganese-based layered positive electrode material and preparation method therefor
  • Lithium-rich manganese-based layered positive electrode material and preparation method therefor
  • Lithium-rich manganese-based layered positive electrode material and preparation method therefor

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Effect test

Embodiment 1

[0049] A lithium-rich manganese-based layered cathode material, the chemical formula of which is Li 1.2 mn 0.54 Ni 0.13 co 0.13 o 2 , the core part is rich in nickel elements, and the outside is rich in manganese and cobalt elements. The above-mentioned lithium-rich manganese-based layered positive electrode material Li 1.2 mn 0.54 Ni 0.13 co 0.13 o 2 The preparation method comprises the following steps:

[0050] (1) 4.12 g of nickel sulfate hexahydrate was dissolved in 11 mL of deionized water to obtain a green transparent solution 1;

[0051] (2) 10.23g of anhydrous sodium carbonate and 1.91g of ammonium bicarbonate were dissolved in 65mL of deionized water to obtain a colorless and transparent solution 2;

[0052] (3) 11.00 g of manganese sulfate monohydrate and 4.41 g of cobalt sulfate heptahydrate were dissolved in 54 mL of deionized water to obtain brown transparent solution 3;

[0053](4) First, add 50mL of deionized water into the three-necked flask as the bo...

Embodiment 2

[0063] A lithium-rich manganese-based layered cathode material, the chemical formula of which is Li 1.2 mn 0.6 Ni 0.2 o 2 , the core part is rich in nickel elements, and the outside is rich in manganese elements. The lithium-rich manganese-based layered cathode material Li 1.2 mn 0.6 Ni 0.2 o 2 The preparation method comprises the following steps:

[0064] (1) 6.1770 g of nickel sulfate hexahydrate was dissolved in 17 mL of deionized water to obtain a green transparent solution 1;

[0065] (2) 10.23g of anhydrous sodium carbonate and 1.91g of ammonium bicarbonate were dissolved in 65mL of deionized water to obtain a colorless and transparent solution 2;

[0066] (3) Dissolve 11.9328 g of manganese sulfate monohydrate in 48 mL of deionized water to obtain a brown transparent solution 3;

[0067] (4) First, add 50mL of deionized water into the three-necked flask as the bottom solution, set the temperature of the water bath to 45°C, and the stirring speed at 750rpm. After...

Embodiment 3

[0072] A lithium-rich manganese-based layered cathode material, the chemical formula of which is Li 1.2 mn 0.7 Ni 0.1 o 2 , the core part is rich in nickel elements, and the outside is rich in manganese elements. The lithium-rich manganese-based layered cathode material Li 1.2 mn 0.7 Ni 0.1 o 2 The preparation method comprises the following steps:

[0073] (1) 4.5627g of nickel sulfate hexahydrate was dissolved in 12mL of deionized water to obtain a green transparent solution 1;

[0074] (2) 6.89g of anhydrous sodium carbonate and 0.91g of ammonium bicarbonate were dissolved in 65mL of deionized water to obtain a colorless and transparent solution 2;

[0075] (3) 9.464g manganese sulfate monohydrate was dissolved in 56mL deionized water to obtain brown transparent solution 3;

[0076] (4) First, add 50mL of deionized water into the three-necked flask as the bottom solution, set the temperature of the water bath to 40°C, and the stirring speed at 600rpm. After the condi...

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Abstract

The invention provides a lithium-rich manganese-based layered positive electrode material and a preparation method therefor. The lithium-rich manganese-based layered positive electrode material can be expressed by Li<1.2>Ni<x>M<0.8-x>O<2> (x is greater than or equal to 0.1 and less than or equal to 0.6), wherein M comprises Mn for sure and one or more than one kinds of Co, Al, Fe and the like or only includes Mn; the core part is rich in nickel element while the exterior is rich in manganese and other mixed transitional metal elements; an obvious core-shell structure is not formed, and the structural consistency is high, so that the structure is more stable; and by virtue of the lithium-rich manganese-based layered positive electrode material, surface enrichment of the nickel element is prevented and structural transformation is suppressed, thereby lowering voltage drop and improving the cycling performance.

Description

technical field [0001] The invention relates to a lithium-ion battery positive electrode material, in particular to a lithium-rich manganese-based layered positive electrode material and a preparation method thereof. Background technique [0002] With the gradual reduction of fossil fuels, people are gradually turning their attention to green energy such as wind energy and solar energy. At this stage, wind power and solar power generation are affected by the climate, and the power output will change at any time. It needs to cooperate with the secondary battery to ensure stable output and reduce the impact on the transmission grid. Lithium-ion batteries have received more and more attention due to their advantages such as high specific energy, good cycle performance, wide operating temperature range, low self-discharge rate, and environmental friendliness. [0003] Lithium-ion batteries are widely used, and people's demand for high-capacity batteries is also increasing. Li...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 耿萌萌杨凯张明杰尹秀娟刘皓高飞范茂松
Owner CHINA ELECTRIC POWER RES INST
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