Manganese-based lamellar lithium-rich material provided with uniform lithium phosphate coating layer and preparation method thereof

A lithium-rich material, lithium phosphate technology, applied in the field of lithium-ion batteries, can solve the problems of reduced rate performance, low electronic and ionic conductivity, etc., and achieve the effect of improving rate performance, high specific capacity, and high rate performance

Active Publication Date: 2017-02-22
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of these coatings have low electronic and ionic conductivity, which can improve the cycle stability of manganese-based lithium-rich materials, but will further reduce their rate performance.

Method used

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  • Manganese-based lamellar lithium-rich material provided with uniform lithium phosphate coating layer and preparation method thereof
  • Manganese-based lamellar lithium-rich material provided with uniform lithium phosphate coating layer and preparation method thereof
  • Manganese-based lamellar lithium-rich material provided with uniform lithium phosphate coating layer and preparation method thereof

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Effect test

Embodiment 1

[0034] A method for preparing a manganese-based layered lithium-rich material with a uniform lithium phosphate coating layer with high capacity and high rate performance, comprising the following steps:

[0035] (1) Add 100mL deionized water into a 250mL high-necked beaker, then stir at a stirring speed of 300r·min -1Add 1.5g tris hydroxymethyl amino methane under the condition of , and make it dissolve fully, obtain solution A;

[0036] (2) At 600r·min -1 Under mechanical stirring, slowly add 1 mol·L solution A at the rate of 3 drops per second -1 hydrochloric acid solution and detect the pH value of solution A in real time with a pH meter, so that its pH value reaches 8.0 and stop adding hydrochloric acid to obtain solution B;

[0037] (3) Add 20mL deionized water into a 100mL high-necked beaker, then stir at a stirring speed of 300r·min -1 Add 5g manganese acetate and 1.7g nickel acetate under the condition of , and make it fully dispersed, obtain mixed solution;

[003...

Embodiment 2

[0044] A method for preparing a manganese-based layered lithium-rich material with a uniform lithium phosphate coating layer with high capacity and high rate performance, comprising the following steps:

[0045] (1) Add 200mL deionized water into a 500mL high-necked beaker, and then stir at a stirring speed of 600r·min -1 Add 2g tris hydroxymethyl amino methane under the condition of , and make it dissolve fully, obtain solution A;

[0046] (2) At 700r·min -1 Under mechanical stirring, slowly add 2 mol·L solution A at the rate of 1 drop per second -1 hydrochloric acid solution and detect the pH value of solution A in real time with a pH meter, so that its pH value reaches 8.5 and stop adding hydrochloric acid to obtain solution B;

[0047] (3) Add 30mL deionized water into a 100mL high-necked beaker, and then stir at a stirring speed of 800r min -1 Add 10g of manganese acetate, 5.1g of nickel acetate and 5.1g of cobalt acetate under the conditions of , and make it fully dis...

Embodiment 3

[0054] A method for preparing a manganese-based layered lithium-rich material with a uniform lithium phosphate coating layer with high capacity and high rate performance, comprising the following steps:

[0055] (1) Add 80mL deionized water into a 400mL high neck beaker, and then stir at a stirring speed of 500r·min -1 Add 1.2g tris hydroxymethyl aminomethane under the condition of , and make it dissolve fully, obtain solution A;

[0056] (2) At 800r·min -1 Under mechanical stirring, slowly add 5mol·L -1 hydrochloric acid solution and detect the pH value of solution A in real time with a pH meter, so that its pH value reaches 8.2 and stop adding hydrochloric acid to obtain solution B;

[0057] (3) Add 50mL deionized water into a 100mL high-necked beaker, and then stir at a stirring speed of 500r·min -1 Add 8g of manganese acetate, 1.9g of nickel acetate, 2.4g of cobalt acetate and 0.8g of iron nitrate under the condition of , and make it fully dispersed to obtain a mixed so...

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Abstract

The invention belongs to the technical field of lithium ion batteries and discloses a manganese-based lamellar lithium-rich material provided with a uniform lithium phosphate coating layer and a preparation method thereof. The preparation method comprises the following steps that a hydrochloride buffering solution of trismetyl aminomethane with the pH range of 8-9 is prepared, then the manganese-based lamellar lithium-rich material is added under the stirring condition, stirring is performed for 1-2 hours, then dopamine hydrochloride is added, stirring is performed for 24-48 hours to obtain a precursor C; lithium phosphate is added to the precursor C under the stirring condition, stirring is performed while heating till only a solid is left, and a precursor D is obtained; the precursor D is put in a muffle furnace of 700-800 DEG C to be burned for 0-24 hours, namely the manganese-based lamellar lithium-rich material provided with the uniform lithium phosphate coating layer is obtained. The manganese-based lamellar lithium-rich material obtained by adopting the preparation method, provided with the uniform lithium phosphate coating layer and having high capacity and rate capability has high specific capacity, rate capability and good cycle performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a manganese-based layered lithium-rich material with a uniform lithium phosphate coating layer and a preparation method thereof. Background technique [0002] In recent years, due to the manganese-based layered oxides (Li[Li x mn y N z ]O 2 , N=metal element, x+y+z=1) has a higher working potential (>3.5V vs Li / Li + ) Its theoretical discharge specific capacity can reach 200mAh g -1 The above has received extensive attention and research. Its high specific energy is expected to become the next generation of high energy density lithium ion battery cathode material. [0003] But at present, it seems that the bottleneck of the development of manganese-based layered oxides is the low electronic and ionic conductivity and cycle performance. The low conductivity is caused by the internal non-electrochemically active Li 2 MnO 3 The composition is affected, whil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/58H01M10/0525
CPCH01M4/366H01M4/505H01M4/5825H01M10/0525Y02E60/10
Inventor 陈东瑞陈敏钟晓欣李伟善
Owner SOUTH CHINA NORMAL UNIVERSITY
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