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Synthetic method for lithium nickel manganese oxygen covered with lithium titanate

A technology of lithium titanate coating and lithium nickel manganese oxide, which is applied in the direction of electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of poor electrical performance of lithium nickel manganese oxide, and achieve improved rate performance and cycle performance And rate performance, the effect of structural stability

Inactive Publication Date: 2015-07-08
HUNAN RESHINE NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a synthesis method of lithium nickel manganese oxide coated with lithium titanate to solve the technical problem of poor electrical properties of lithium nickel manganese oxide prepared by traditional methods

Method used

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  • Synthetic method for lithium nickel manganese oxygen covered with lithium titanate
  • Synthetic method for lithium nickel manganese oxygen covered with lithium titanate
  • Synthetic method for lithium nickel manganese oxygen covered with lithium titanate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] 1) NiSO 4 , MnSO 4 and Cr(NO 3 ) 3 Add Ni:Mn:Cr=1:3:1 into distilled water at a molar ratio to form a mixed solution with a total molar concentration of 2.5mol / L.

[0057] 2) Under the conditions of a protective gas atmosphere, a stirring speed of 400rpm and 30°C, the ratio of EDTA to the mixed solution is mixed according to the molar ratio of EDTA:(Mn+Ni+Cr)=0.1, And add NaOH solution to adjust the pH value to 9, carry out the precipitation reaction, and obtain the suspension solution.

[0058] 3) Oxidize the suspended solution, centrifuge the solid, and dry to obtain a molecular formula of Ni 0.4 mn 1.2 Cr 0.4 OOH precursor powder.

[0059] 4) will Li 2 CO 3 and precursor powder by Li 2 CO 3 : (Ni+Mn+Cr) = 0.2 mixed, sintered at 700 ° C for 15 hours for the first sintering to obtain LiNi 0.4 mn 1.2 Cr 0.4 o 4 .

[0060] 5) LiNi 0.4 mn 1.2 Cr 0.4 o 4 , Li 2 CO 3 、TiO 2 powder, add pure water, mix, disperse, and dry to obtain a mixed solid materia...

Embodiment 2

[0063] 1) NiCl 2 , MnSO 4 and AlCl 3 Add Ni:Mn:Al=6:18:1 into distilled water at a molar ratio to form a mixed solution with a total molar concentration of 2.5mol / L.

[0064] 2) Under the conditions of a protective gas atmosphere, a stirring speed of 450rpm and 40°C, the ratio of disodium edetate to the mixed solution is based on disodium edetate: (Mn+Ni+Al)=0.3 The molar ratio was mixed, and KOH solution was added to adjust the pH value to 9.5, and a precipitation reaction was carried out to obtain a suspension solution.

[0065] 3) Oxidize the suspended solution, centrifuge the solid, and dry to obtain a molecular formula of Ni 0.48 mn 1.44 Al 0.08 OOH precursor powder.

[0066] 4) Mix LiCl and precursor powder according to LiCl: (Ni+Mn+Al)=0.6, and sinter at 750°C for 20 hours for the first sintering to obtain LiNi 0.48 mn 1.44 Al 0.08 o 4 .

[0067] 5) LiNi 0.48 mn 1.44 Al 0.08 o 4 , LiF, TiO 2 powder, add pure water, mix, disperse, and dry to obtain a mixe...

Embodiment 3

[0070] 1) Ni(NO 3 ) 2 、C 4 h 6 o 4 Ni, Mn(NO 3 ) 2 and B 2 o 3 Add in pure water at a molar ratio of Ni:Mn:B=6:18:1 to form a mixed solution with a total molar concentration of 1.5mol / L. where Ni(NO 3 ) 2 and C 4 h 6 o 4 The molar ratio of Ni is 1:1.

[0071] 2) Under the conditions of a protective gas atmosphere, a stirring speed of 500rpm and 50°C, the ratio of the mixed complexing agent solution of ethylenediamine and ammonium sulfate to the mixed solution is according to the mixed complexing agent solution: (Mn+Ni+B) = 0.7 molar ratio, and adding KOH solution to adjust the pH value to 10, and carry out precipitation reaction to obtain a suspension solution. Wherein the molar ratio of ethylenediamine to ammonium sulfate is 2:1.

[0072] 3) Oxidize the suspended solution, centrifuge the solid, and dry to obtain a molecular formula of Ni 0.48 mn 1.44 B 0.08 OOH precursor powder.

[0073] 4) will Li 2 SO 4 and precursor powder by Li 2 SO 4 : (Ni+Mn+B) = ...

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Abstract

The invention discloses a preparing method for lithium nickel manganese oxygen covered with lithium titanate. The method comprises the following steps that firstly, Ni, Mn and M are added into pure water, and a mixed solution with the total molar concentration ranging from 1.0 mol / L to 3.0 mol / L is obtained; secondly, a complexing agent solution is added into the mixed solution, the pH value is mixed to be ranging from 9 to 12, and a supernatant solution is obtained; thirdly, the supernatant solution is oxidized, the solid centrifugal separation is carried out, drying is carried out, and precursor powder is obtained; fourthly, Li source compound is mixed with the precursor powder, a first time sintering is carried out, LiNi (0.5-x) Mn (1.5-y) M (x+y) O4 is obtained, pure water adding and the drying are carried out on the LiNi (0.5-x) Mn (1.5-y) M (x+y) O4, second Li source compound and TiO2 powder, and a mixed solid material is obtained; sixthly, secondary sintering is carried out on the mixed solid material, and an electrode material covered with the lithium titanate is obtained. According to the prepared electrode material covered with the lithium titanate, the cycle performance and the rate performance of the electrode material can be effectively improved.

Description

technical field [0001] The invention relates to the field of lithium ion battery materials, in particular to a synthesis method of lithium nickel manganese oxide coated with lithium titanate. Background technique [0002] At present, the voltage of the positive electrode material of lithium-ion battery used commercially is generally 3.7V, while the new binary positive electrode material LiNi 0.5 mn 1.5 o 4 The voltage can reach 4.8V, and its application in lithium-ion batteries can improve the energy density of the positive electrode material. Compared with LiMn 2 o 4 Speaking, the theoretical capacity of the two is close, about 148mAh / g, LiNi 0.5 mn 1.5 o 4 voltage than LiMn 2 o 4 It is nearly 1V higher, and the energy density is increased by about 25%. However, as a cathode material for lithium-ion batteries, it also has the problems of poor high-temperature cycle performance and general rate performance. The reason is that high voltage LiNi 0.5 mn 1.5 o 4 In t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 公伟伟王世银宋文锋池田一崇宋振伟陈敏黄海翔
Owner HUNAN RESHINE NEW MATERIAL
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