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Hollow porous spherical mixed oxide for lithium ion battery negative electrode and preparation method of hollow porous spherical mixed oxide

A technology of lithium-ion batteries and mixed oxides, applied in the field of nanomaterials and chemical power sources, can solve problems such as unsuitable for actual production, high cost, poor cycle stability, etc., to improve high-current discharge performance and cycle stability, and improve structural stability Sexuality, the effect of speeding up the transmission speed

Active Publication Date: 2015-03-25
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, metal oxides as anode materials for lithium-ion batteries still face problems such as large initial capacity loss, poor cycle stability, and poor rate discharge performance.
In addition, the preparation process of metal oxide-based anode materials reported in the literature is complicated and costly, which is not suitable for actual production.

Method used

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  • Hollow porous spherical mixed oxide for lithium ion battery negative electrode and preparation method of hollow porous spherical mixed oxide
  • Hollow porous spherical mixed oxide for lithium ion battery negative electrode and preparation method of hollow porous spherical mixed oxide
  • Hollow porous spherical mixed oxide for lithium ion battery negative electrode and preparation method of hollow porous spherical mixed oxide

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Experimental program
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Effect test

Embodiment 1

[0032] First weigh 1.67mmol of Ni(NO 3 ) 2 ·6H 2O and 3.33 mmol of MnSO 4 ·H 2 O, then measure 35mL of absolute ethanol and add it to 350mL of deionized water, stir vigorously, and obtain liquid A after the above-mentioned salts are completely dissolved; at the same time, add 50mmol of NH to another 350mL of deionized water 4 HCO 3 And after vigorous stirring, liquid B was obtained. Subsequently, liquid B was added to liquid A and stirred vigorously, and then the reaction liquid was heated to 45° C. for 9 h. After stopping the reaction, the reaction solution was filtered and washed with a large amount of deionized water, and then dried in vacuum at 60°C to obtain a light green solid (Ni 0.14 mn 0.86 CO 3 ). The obtained solid was placed in a muffle furnace and fired at 600°C at a heating rate of 2°C / min for 3 hours, and then continued to be fired at 900°C at a heating rate of 2°C / min for 2 hours to obtain the prepared porous hollow Ni 0.14 mn 0.86 o 1.43 Microspher...

Embodiment 2

[0035] First weigh 1.67mmol of NiSO 4 ·6H 2 O and 3.33mmol of Mn(NO 3 ) 2 , then measure 70mL of absolute ethanol and add it to 350mL of deionized water, stir vigorously, and obtain liquid A after the above salts are completely dissolved; at the same time, add 75mmol of NH to another 350mL of deionized water 4 HCO 3 And after vigorous stirring, liquid B was obtained. Subsequently, liquid B was added to liquid A and stirred vigorously, and then the reaction liquid was heated to 45° C. for 9 h. After stopping the reaction, the reaction solution was filtered and washed with a large amount of deionized water, and then dried in vacuum at 60° C. to obtain a light green solid. The obtained solid was placed in a muffle furnace and calcined at a rate of 2 °C / min to 600 °C for 3 h, and then continued to be calcined at a rate of 2 °C / min to 900 °C for 2 h to obtain the prepared porous hollow mixed oxide.

Embodiment 3

[0037] First weigh 1.67 mmol of C 4 h 6 o 4 Ni·4H 2 O and 3.33 mmol of C 4 h 6 MnO 4 , then measure 25mL of absolute ethanol and add it to 375mL of deionized water, stir vigorously, and obtain liquid A after the above salts are completely dissolved; at the same time, add 25mmol of NH to another 350mL of deionized water 4 HCO 3 And after vigorous stirring, liquid B was obtained. Subsequently, liquid B was added to liquid A and stirred vigorously, and then the reaction liquid was heated to 45° C. for 9 h. After stopping the reaction, the reaction solution was filtered and washed with a large amount of deionized water, and then dried in vacuum at 60° C. to obtain a light green solid. The obtained solid was placed in a muffle furnace and calcined at a rate of 2 °C / min to 600 °C for 3 h, and then continued to be calcined at a rate of 2 °C / min to 900 °C for 2 h to obtain the prepared porous hollow mixed oxide.

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Abstract

The invention relates to hollow porous spherical mixed oxide for a lithium ion battery negative electrode and a preparation method of the hollow porous spherical mixed oxide. The material is a uniform nano-mixture of Mn2O3 and NiMn2O4, and a specific chemical formula is NixMn<1-x>O<1.5-0.5x> (x is more than 0 and less than 1 / 3). The preparation method of the hollow porous spherical mixed oxide comprises the steps that based on complexing action of ammonia water and nickel ions, the precipitation speed of nickel carbonate is reduced, so that a spherical structure of the manganese carbonate cannot be destroyed by the nickel carbonate and has a certain modification function on a spherical structure of the manganese carbonate to form a uniform spherical mixture (NixMn<1-x>CO3, x is more than 0 and less than 1 / 3) of the nickel carbonate and the manganese carbonate; the prepared hollow porous spherical mixed oxide for the lithium ion battery negative electrode is obtained by using a high-temperature segmental roasting process. Compared with the prior art, the method is easy to operate and suitable for industrial large batch production; by utilizing the hollow porous spherical mixed oxide, the large-current charging / discharging performance of the lithium ion battery negative electrode can be effectively improved, and the and the cycle life of the lithium ion battery negative electrode can be effectively prolonged.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials and chemical power sources, and in particular relates to a hollow porous spherical mixed oxide for negative electrodes of lithium ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion battery is an energy conversion device with high energy density, high power density, high safety performance, long cycle life, etc., and has great potential for application in electric vehicles and large-scale power grids (Science, 311(2006) 977 -980; Nature, 414 (2001) 359-367). At present, the anode materials used in commercial lithium-ion batteries are mainly carbon materials, such as natural graphite, mesocarbon microspheres (MCMB), and pitch coke. But its theoretical specific capacity is low, only 372mAh g -1 , and its rate performance and safety performance are poor. Due to its high mass specific capacity and volume specific capacity, metal oxide materials have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/136H01M4/1397
CPCB82Y40/00H01M4/1391H01M4/364H01M4/502H01M4/505Y02E60/10
Inventor 马忠原鲜霞李琳马紫峰
Owner SHANGHAI JIAO TONG UNIV
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