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Preparation method of composite anode material of lithium-ion power battery

A composite cathode material and power battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor conductivity and rate performance, affecting applications, etc., and achieve excellent conductivity, high specific capacity, and good rate performance. Effect

Inactive Publication Date: 2013-02-13
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, with LiCoO 2 Compared to LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 Poor conductivity and rate performance, which affects its wider application

Method used

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  • Preparation method of composite anode material of lithium-ion power battery
  • Preparation method of composite anode material of lithium-ion power battery
  • Preparation method of composite anode material of lithium-ion power battery

Examples

Experimental program
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Effect test

example 1

[0021] With Li(CH 3 COO)·2H 2 O is Li source, Ni(CH 3 COO) 2 4H 2 O, Co(CH 3 COO) 2 4H 2 O, Mn(CH 3 COO) 2 4H 2 O is Ni source, Co source, Mn source respectively. According to the molar ratio Li:(Ni+Co+Mn)=1.1:1 (the molar ratio of Ni:Co:Mn is 1:1:1), weigh the corresponding raw materials in 50ml deionized water, and use this mixed solution as liquid A . Then weigh citric acid and ethylene glycol (the molar ratio of citric acid and ethylene glycol is 1:3) with the amount of total metal ions and other substances and dissolve it in 50ml of alcohol as solution B. Slowly add liquid A to liquid B dropwise, and use a water bath to stir magnetically at about 60°C to allow citric acid to coordinate with metal ions. After the dropwise addition is complete, heat up to 95°C to cause esterification between the citric acid complex and ethylene glycol, and the solution becomes viscous at this time. Next, the viscous liquid was dried in a vacuum oven at 120° C. to obtain a xerog...

example 2

[0024] This example investigates the effect of the molar ratio Li:(Ni+Co+Mn) on the electrochemical performance of the material. The results of 0.2C constant current charge and discharge are shown in Table 1. Except that the molar ratio Li:(Ni+Co+Mn) is different from Example 1, other conditions are consistent with Example 1.

[0025] Table 1Li: (Ni+Co+Mn) molar ratio versus LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 The influence of the electrochemical performance of the material

[0026]

example 3

[0028] This example investigates the effect of the molar ratio of citric acid to ethylene glycol on the electrochemical performance of the material. The results of 0.2C constant current charge and discharge are shown in Table 2. Except that the mol ratio of citric acid and ethylene glycol is different from example 1, other conditions are all consistent with example 1.

[0029] Table 2 The molar ratio of citric acid to ethylene glycol versus LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 The influence of the electrochemical performance of the material

[0030]

[0031]

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Abstract

The invention discloses a preparation method of a composite anode material of a lithium-ion power battery. The composite anode material comprises LiNi1 / 3Co1 / 3Mn1 / 3O2 and carbon nano tubes (CNTs). According to the preparation method, citric acid is used as a chelating agent, ethylene glycol is used as a cross-linking agent, and the composite anode material LiNi1 / 3Co1 / 3Mn1 / 3O2 / CNTs of a lithium-ion battery is prepared through a Pechini method and a high-energy ball milling method. Compared with the traditional precipitation type preparation method, the preparation method provided by the invention is simpler, and the synthesized composite anode material LiNi1 / 3Co1 / 3Mn1 / 3O2 / CNTs have the characteristics of high specific capacity, high cycle performance, excellent rate capability and the like.

Description

technical field [0001] The invention relates to a composite cathode material LiNi for a lithium ion power battery 1 / 3 co 1 / 3 mn 1 / 3 o 2 The invention relates to a preparation method of CNTs, which belongs to the field of new energy. Background technique [0002] At present, lithium-ion batteries have been successfully used in many portable electronic products such as mobile phones, notebook computers, video cameras, digital cameras, etc. The main selection object of the rechargeable power supply has aroused great concern from the society. In the development process of lithium-ion batteries, the cathode material as a lithium source is the key to the development of lithium-ion batteries. It is not only the bottleneck of lithium-ion battery capacity improvement, but also the most important factor determining the price of lithium-ion batteries. Its quality directly determines The performance index of the final lithium-ion battery product. Commercial LiCoO 2 Due to high co...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M4/62
CPCY02E60/12Y02E60/10
Inventor 张海燕胡丽叶剑贺春华
Owner GUANGDONG UNIV OF TECH
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