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Modification method of ternary anode material of lithium ion battery

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, electrical components, secondary batteries, etc., can solve problems such as hindering lithium-ion transmission, lack of lithium-ion channels, and affecting material rate performance, etc., to achieve material processing performance and Excellent electrochemical performance, simple preparation method, and the effect of improving air storage performance

Inactive Publication Date: 2014-11-05
BEIJING WANYUAN IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these commonly used coating materials do not have lithium ion channels, which will hinder lithium ion transport to a certain extent, thereby affecting the rate performance of the material.

Method used

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  • Modification method of ternary anode material of lithium ion battery
  • Modification method of ternary anode material of lithium ion battery
  • Modification method of ternary anode material of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: NH with a molar ratio of 2:1:2 4 H 2 PO 4 , V 2 O 5 And C 6 H 8 O 7 ·H 2 O is placed in deionized water to control the concentration of vanadium ions to 0.1 mol L -1 , Add ammonia water to adjust pH=6, stir at 80℃ to form a solution; VOPO 4 The amount of coating is 1% to calculate the required LiNi 0.5 Co 0.2 Mn 0.3 O 2 The quality of the deionized water is placed in the solution and diluted with deionized water; the quality of deionized water is the same as that of LiNi 0.5 Co 0.2 Mn 0.3 O 2 The mass ratio is 1:1; after mixing uniformly, spray drying, control the inlet air temperature to 150°C, and the outlet temperature to 100°C. The obtained powder is calcined in oxygen at 850°C for 180 minutes, cooled in the furnace and sieved to obtain VOPO 4 LiNi battery with 1% coating 0.5 Co 0.2 Mn 0.3 O 2 Cathode material. From figure 1 It can be seen that there is no impurity peak in the XRD spectrum of the coated sample. From figure 2 It can be seen that there is a u...

Embodiment 2

[0024] Example 2: NH with a molar ratio of 2:1:2 4 H 2 PO 4 , V 2 O 5 And C 6 H 8 O 7 ·H 2 O is placed in deionized water to control the concentration of vanadium ions to 0.3 mol L -1 , Add ammonia water to adjust pH=5, stir at 70℃ to form a solution; take VOPO 4 The amount of cladding is 3% to calculate the required LiNi 0.8 Co 0.1 Mn 0.1 O 2 The quality of the deionized water is placed in the solution and diluted with deionized water. 0.5 Co 0.2 Mn 0.3 O 2 The mass ratio is 2:1; after mixing uniformly, spray drying, control the inlet air temperature to 120°C, and the outlet temperature to 100°C. The obtained powder is calcined in oxygen at 700°C for 300 minutes, cooled in the furnace and sieved to obtain VOPO 4 LiNi battery with 3% coating 0.8 Co 0.1 Mn 0.1 O 2 Cathode material. The sample was made into a button battery and charged to 4.3V with 0.1C, then placed in a 90°C constant temperature box for 5 hours, and then subjected to a 2C cycle test. From Figure 4 It can be seen ...

Embodiment 3

[0027] Example 3: NH with a molar ratio of 2:1:2 4 H 2 PO 4 , V 2 O 5 And C 6 H 8 O 7 ·H 2 O is placed in deionized water to control the concentration of vanadium ions to 0.05 mol L -1 , Add ammonia water to adjust pH=7, stir at 60℃ to form a solution; take VOPO 4 The coating amount is 0.5% to calculate the required LiNi 0.6 Co 0.2 Mn 0.2 O 2 The quality of the deionized water is placed in the solution and diluted with deionized water. 0.5 Co 0.2 Mn 0.3 O 2 The mass ratio is 0.5:1; after mixing uniformly, spray drying, control the inlet air temperature to 150°C and the outlet temperature to 110°C. The obtained powder is calcined in oxygen at 800°C for 240 minutes, cooled in the furnace and sieved to obtain VOPO 4 LiNi battery with 0.5% coating 0.6 Co 0.2 Mn 0.2 O 2 Cathode material. The samples were made into button batteries to test the electrochemical performance, from Figure 5 It can be seen that the cycle performance of the coated sample is better than that of the uncoated s...

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Abstract

The invention discloses a modification method of a ternary anode material, namely an LiNi1-x-yCoxMnyO2 anode material of a lithium ion battery. The modification method comprises the steps of weighing a material, stirring the material to form a solution, adding a modified material, performing sintering, performing cooling and performing screening to obtain the VOPO4 cladded LiNi1-x-yCoxMnyO2 anode material. The modification method is simple in preparation method, short in flow and excellent in material processing performance and electrochemical performance.

Description

Technical field [0001] The invention belongs to the field of lithium ion battery cathode materials, and specifically relates to lithium ion battery LiNi 1-x-y Co x Mn y O 2 Modification method of positive electrode material. Background technique [0002] High energy density, long cycle life and high safety are the unanimous goals pursued by current lithium-ion batteries. The performance of lithium-ion battery cathode materials largely affects the performance of the entire battery. Therefore, the research and development of cathode materials appears to be extremely important. Important. [0003] Currently, the commercial cathode material is still LiCoO 2 However, the scarcity of cobalt resources leads to high prices, and adverse factors such as toxicity and poor thermal stability limit its further application. 1-x-y Co x Mn y O 2 The material combines LiCoO 2 , LiNiO 2 , LiMnO 2 The characteristics of the three, compared to LiCoO 2 It has the advantages of high energy density, low c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/366H01M4/505H01M4/525H01M4/5825H01M10/0525Y02E60/10
Inventor 庞瑞卿岳鹏马锐沈健民陈坤曹炬宗新林
Owner BEIJING WANYUAN IND
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