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Grapheme like coated lithium rich layered lithium nickel manganese oxide and preparation method and application thereof

A graphene-coated, lithium nickel manganese oxide technology, applied to electrical components, battery electrodes, circuits, etc., to achieve high structural stability, good cycle stability, and excellent electrochemical performance

Active Publication Date: 2013-09-04
SHENZHEN EIGEN EQUATION GRAPHENE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although layered lithium manganate has many advantages, it also has its own defects, that is, how to improve the layered LiMnO 2 Cycle performance while ensuring large capacity and high rate performance of the battery

Method used

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  • Grapheme like coated lithium rich layered lithium nickel manganese oxide and preparation method and application thereof
  • Grapheme like coated lithium rich layered lithium nickel manganese oxide and preparation method and application thereof
  • Grapheme like coated lithium rich layered lithium nickel manganese oxide and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] A. Dilute 50ml of Ni(NO 3 ) 2 and Mn(NO 3 ) 2 The mixed solution was slowly added to 400 ml of LiOH??H 2 O solution was precipitated. After filtering and washing the obtained precipitate for 2-3 times, the precipitate was dried overnight at 180°C to obtain a mixed transition metal hydroxide precursor [Ni 0.5 mn 0.5 ](OH) 2 .

[0051] B. Weigh the raw material LiOH·H according to the setting 1.1:1 2 O, [Ni 0.5 mn 0.5 ](OH) 2 , fully grind the raw materials at room temperature, mix evenly, carry out the first sintering (400°C, 6 hours) in the air atmosphere, cool and grind, and then carry out the second sintering in the muffle furnace (1200°C, 5 hours) hours), cooling and grinding to obtain the product lithium-rich layered compound Li[(Ni 0.5 mn 0.5 ) 0.9 Li 0.1 ]O 2 Cathode material.

[0052] C. Heat 5g of 10% LPAN (molecular weight 1600) solution (mass percentage) at 120°C for 20 hours to form a microcyclized LPAN solution, then add 10g of Li[(Ni 0.5 m...

Embodiment 2

[0054] A. Dilute 50ml of Ni(NO 3 ) 2 and Mn(NO 3 ) 2 The mixed solution was slowly added to 400 ml of LiOH??H 2 O solution was precipitated. After filtering and washing the obtained precipitate for 2-3 times, the precipitate was dried overnight at 180°C to obtain a mixed transition metal hydroxide precursor [Ni 0.3 mn 0.7 ](OH) 2 .

[0055] B. Weigh the raw material LiOH·H according to the setting 1.15:1 2 O, [Ni 0.3 mn 0.7 ](OH) 2 , fully grind the raw materials at room temperature, mix evenly, carry out the first sintering (500°C, 4 hours) in the air atmosphere, cool and grind, and then carry out the second sintering in the muffle furnace (1000°C, 20 hours), cooling and grinding to obtain the product lithium-rich layered compound Li[(Ni 0.3 mn 0.7 ) 0.85 Li 0.15 ]O 2 Cathode material.

[0056] C. Heat 5g of 10% LPAN (molecular weight 1600) solution (mass percentage) at 120°C for 20 hours to form a microcyclized LPAN solution, then add 10g of Li[(Ni 0.3 mn ...

Embodiment 3

[0058] A. Dilute 50ml of Ni(NO 3 ) 2 and Mn(NO 3 ) 2 The mixed solution was slowly added to 400 ml of LiOH??H 2 O solution was precipitated. After filtering and washing the obtained precipitate for 2-3 times, the precipitate was dried overnight at 180°C to obtain a mixed transition metal hydroxide precursor [Ni 0.4 mn 0.6 ](OH) 2 .

[0059] B. Weigh the raw material LiOH·H according to the setting 1.2:1 2 O, [Ni 0.4 mn 0.6 ](OH) 2 , fully grind the raw materials at room temperature, mix evenly, carry out the first sintering (600°C, 2 hours) in the air atmosphere, cool and grind, and then carry out the second sintering in the muffle furnace (500°C, 40 hours), cooling, grinding to obtain the product lithium-rich layered compound Li[(Ni 0.4 mn 0.6 ) 0.9 Li 0.1 ]O 2 Cathode material.

[0060] C. Heat 5g of 10% LPAN (molecular weight 1600) solution (mass percentage) at 120°C for 20 hours to form a microcyclized LPAN solution, then add 10g of Li[(Ni 0.4 mn 0.6 ) ...

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Abstract

The invention discloses a grapheme like coated lithium rich layered lithium nickel manganese oxide and preparation method and application thereof, and the preparation method is as follow: a liquid state acrylonitrile oligomer solution is stirred for 8-72 hours at 80-300 DEG C. for forming a LPAN solution with micro cyclization; a proper amount of lithium ion batteries cathode material layered lithium nickel manganese oxide powder is added into the LPAN solution with micro cyclization for uniformly mixing; after stirring, the solution is slowly and completely evaporated at 80 DEG C.; the material is fully crosslinkinged at 220 DEG C.; finally, the product is calcined for 5-40 hours in a muffle furnace at 750-900 DEG C. with air atmosphere, and the LPAN with micro cyclization forms the grapheme like structure, which is uniformly distributed in the lithium ion battery anode layered lithium nickel manganese oxide, thereby obtaining the grapheme like coated lithium rich layered lithium nickel manganese oxide. The grapheme like coated lithium rich layered lithium nickel manganese oxide has the advantages of higher structure stability and excellent electrochemistry performance, and better cycle stabilization performance.

Description

technical field [0001] The invention relates to the field of chemical batteries, in particular to a graphene-like coated lithium-rich layered lithium nickel manganese oxide and a preparation method thereof. The graphene-like coated lithium-rich layered lithium nickel manganese oxide can be used to prepare lithium-ion battery positive electrodes Material. Background technique [0002] In recent years, new energy vehicles with new energy power as the core have attracted much attention. Among all kinds of new energy power forms, lithium-ion batteries have become the most promising ideal energy source in the 21st century due to their high working voltage, high specific energy, no memory effect, no pollution, small self-discharge, and long cycle life. [0003] The key to the development of lithium-ion batteries is the development of cathode materials. At present, the commonly used cathode materials for lithium-ion batteries mainly include lithium cobaltate, lithium nickelate, l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/131H01M4/62
CPCY02E60/10
Inventor 刘剑洪卓海涛何传新张黔玲
Owner SHENZHEN EIGEN EQUATION GRAPHENE TECH CO LTD