High capacity cathode material of lithium ion battery and preparation method thereof

A technology for lithium-ion batteries and positive electrode materials, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve problems that have not been seen, and achieve the effects of shortened migration paths, strong adsorption capacity, and moderate hardness

Inactive Publication Date: 2012-03-21
ADVANCED MFG TECH CENT CHINA ACAD OF MASCH SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there is no xLi for synthesizing ordered tubular structure

Method used

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  • High capacity cathode material of lithium ion battery and preparation method thereof
  • High capacity cathode material of lithium ion battery and preparation method thereof
  • High capacity cathode material of lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: Dissolve 5.1010 g of lithium acetate, 1.2941 g of nickel acetate, 5.1959 g of manganese acetate, and 1.2953 g of cobalt acetate in deionized water; add 1.5 g of cane charcoal and stir at 900 rpm for 1 hour. An aqueous solution containing 33 g of citric acid was added dropwise, and the pH value of the mixed system was adjusted to 10 with ammonia water, the reaction temperature was maintained at 70° C., and the stirring speed was 1200 rpm until a gel was formed. After the gel is dried, it is pre-calcined at 450°C for 4 hours, cooled and ground, calcined at 800°C for 8 hours, cooled and ground, and passed through a 200-mesh sieve to produce 0.5Li 2 MnO 3 0.5Li[Ni 1 / 3 mn 1 / 3 co 1 / 3 ]O 2 Material.

[0030] With the 0.5Li that embodiment 1 makes 2 MnO 3 0.5Li[Ni 1 / 3 mn 1 / 3 co 1 / 3 ]O 2 The material is mixed with the conductive agent carbon black and the binder polyvinylidene fluoride at a ratio of 85:10:5, and an appropriate amount of N-methylpyrrolidone ...

Embodiment 2

[0031] Example 2: Dissolve 4.76g of lithium oxalate, 1.2183g of nickel oxalate, 3.5798g of manganese oxalate and 3.6596g of cobalt oxalate in deionized water; add 2.5g of bamboo charcoal and stir at 1000 rpm for 0.5 hours. Then, an aqueous solution containing 9.6 g of polyvinyl alcohol was added dropwise, and the pH value of the mixed system was adjusted to 9 with urea, the reaction temperature was kept at 80° C., and the stirring speed was 1000 rpm until a gel was formed. After the gel is dried, calcined at 550°C for 3 hours, cooled and ground, calcined at 950°C for 9 hours, passed through a 200-mesh sieve after cooling and ground, and produced 0.4Li 2 MnO 3 0.6Li[Ni 1 / 3 mn 1 / 3 co 1 / 3 ]O 2 Material.

[0032] With the 0.4Li that embodiment 2 makes 2 MnO 30.6Li[Ni 1 / 3 mn 1 / 3 co 1 / 3 ]O 2 The material is mixed with the conductive agent carbon black and the binder polyvinylidene fluoride at a ratio of 85:10:5, and an appropriate amount of N-methylpyrrolidone solvent is ...

Embodiment 3

[0033] Example 3: Dissolve 3.3940 g of lithium nitrate, 1.1930 g of nickel nitrate, 6.4768 g of manganese nitrate, and 1.1940 g of cobalt nitrate in deionized water; add 1.6 g of loofah pulp and stir at 1500 rpm for 1.5 hours. An aqueous solution containing 24.62 g of sucrose was added dropwise, and the pH value of the mixed system was adjusted to 11 with ammonia water, the reaction temperature was kept at 90° C., and the stirring speed was 1500 rpm until a gel was formed. After the gel is dried, it is calcined at 650°C for 4 hours, cooled and ground, calcined at 850°C for 10 hours, cooled and ground, and passed through a 200-mesh sieve to produce 0.6Li 2 MnO 3 0.4Li[Ni 1 / 3 mn 1 / 3 co 1 / 3 ]O 2 Material.

[0034] With the 0.6Li that embodiment 3 makes 2 MnO 3 0.4Li[Ni 1 / 3 mn 1 / 3 co 1 / 3 ]0 2 The material is mixed with the conductive agent carbon black and the binder polyvinylidene fluoride at a ratio of 85:10:5, and an appropriate amount of N-methylpyrrolidone solvent ...

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Abstract

The invention relates to a cathode material which has a tubular ordered structure and is applied in lithium ion batteries and a preparation method thereof, belonging to the fields of nano-material preparation technology and green energy. The cathode material is of a Li-rich layered structure and has a chemical molecular formula of xLi2MnO3.(1-x)Li[Ni1/3Mn1/3Co1/3]O2, wherein, x is more than 0 and less than 1. According to the invention, a natural biomaterial is used as a template for the cathode material, an internally uniform and dispersive cathode material precursor of the template is prepared by using the sol-gel method, and the template is removed by high temperature calcination so as to obtain a final product. Since a transition metal layer of the cathode material contains a certain amount of lithium, reversible and deintercalated lithium ions in actual discharge can be increased, and therefore, the discharge capacity of the cathode material is improved. The preparation method is capable of synthesizing tubular cathode materials, which enables the migration path of lithium ions in an electrode material to be shortened and the deintercalation rate of lithium ions to be enhanced.

Description

technical field [0001] The invention relates to a high-capacity electrode material with a three-dimensional tubular ordered structure and a nanoscale used in lithium-ion batteries and a preparation method thereof, belonging to the field of preparation of lithium-ion battery materials. Background technique [0002] Cathode material is an important part of lithium-ion batteries, and it is also the most expensive part of lithium-ion batteries. Almost all commercial lithium-ion batteries currently use lithium cobalt oxide (LiCoO 2 ) as the cathode material. When the battery is in the charging state, the layered lithium cobalt oxide that loses some lithium ions is very unstable and prone to chemical reactions. If the local temperature is too high, the battery will "thermally run away", causing fire or even explosion. The larger the battery capacity, the greater the probability of thermal runaway. Therefore, the safety problems of large-capacity lithium-ion batteries are becomi...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M4/505H01M4/131H01M4/1391
CPCY02E60/122Y02E60/10
Inventor 王萌陈蕴博陈林左玲立
Owner ADVANCED MFG TECH CENT CHINA ACAD OF MASCH SCI & TECH
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