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High rate lithium secondary battery negative electrode material based on second phase compounding and preparation method thereof

A lithium secondary battery and negative electrode material technology, applied in the field of electrochemical power sources, to achieve the effect of simple and easy preparation process and low cost

Inactive Publication Date: 2008-03-19
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

We know that the electrode materials of oxide and other systems are usually poor conductors of electrons, which is also one of the fundamental factors restricting the rate characteristics of batteries. Doping, and also doping expensive platinum as the second-phase conductive agent, usually does not fundamentally solve the problem

Method used

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  • High rate lithium secondary battery negative electrode material based on second phase compounding and preparation method thereof
  • High rate lithium secondary battery negative electrode material based on second phase compounding and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 2

[0015] Example 2 Li 4 Ti 5 o 12 materials and Cu(NO 3 ) 2 ·3H 2 O was mixed with alcohol at a molar ratio of 7:3, ball milled for 4 hours, dried at 80°C, then calcined in a reducing atmosphere at 500°C for 2 hours, and naturally cooled to room temperature to obtain 94wt% Li 4 Ti 5 o 12 / 6wt%Cu xO composite powder. SEM is shown in Figure 2(b). The preparation method of the battery is the same as in Example 1, and the charge and discharge test is carried out. The first discharge capacity of the composite material synthesized under the reducing atmosphere between 2.3-0.5V at 2C and 8C rates is 189.8 and192.6mAh / g, the matrix compound Li prepared under the same conditions 4 Ti 5 o 12 The first discharge capacity of the first discharge capacity is 162.2 and 98.9mAh / g, containing the second phase metal copper and its oxide Cu x The initial discharge capacities of the composites with O are 14.5% and 48.7% higher, respectively. The 10th discharge capacity of the composite...

Embodiment 3

[0016] Example 3 Li 4 Ti 5 o 12 material and CuCO 3 Using water as the medium at a molar ratio of 7:5, wet mixing by ball milling for 2 hours, drying at close to 100°C, calcining in a reducing atmosphere at 550°C for 1.5 hours, and naturally cooling to room temperature to obtain 89wt% Li 4 Ti 5 o 12 / 11wt%Cu x O composite powder. The preparation method of the battery is the same as in Example 1, and the charge and discharge test is carried out. The first discharge capacity between 2.3-0.5V under the rate of 2C and 8C is 186.8and195.2mAh / g respectively, and the matrix compound Li 4 Ti 5 o 12 The first discharge capacity of the first discharge capacity is 162.2 and 98.9mAh / g, containing the second phase metal copper and its oxide Cu x The initial discharge capacities of the composites with O are 15.2% and 97.4% higher, respectively. The 10th discharge capacity of the composite material is 164.1 and 166.9mAh / g at 2C and 8C, respectively, and the matrix material is 155 a...

Embodiment 4

[0017] Example 4 Li 4 Ti 5 o 12 materials and CuC 2 o 4 1 / 2H 2 O was mixed by ball milling at a molar ratio of 7:6 for 2 hours, then calcined in a reducing atmosphere at 550 °C for 1.5 hours, and naturally cooled to room temperature to obtain 87 wt% Li 4 Ti 5 o 12 / 13wt%Cu x O composite powder. The preparation method of the battery is the same as in Example 1, and the charge and discharge test is carried out. The first discharge capacity between 2.3-0.5V under the rate of 2C and 8C is 193.8and195.2mAh / g respectively, and the matrix compound Li 4 Ti 5 o 12 The discharge capacity of the first discharge was 162.2 and 98.9mAh / g respectively, the discharge capacity of the 10th discharge was 165.1 and 167.6mAh / g for the composite material 2C and 8C respectively, and 155 and 72.5mAh / g for the matrix material. The reversible cycle capacity and stability of the composites synthesized under reducing atmosphere at various rates, especially at high rates, are significantly impr...

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Abstract

This invention relates to negative electrode material and preparation method for high-rate lithium secondary battery based on second phase composite, wherein, the basis material is Li4Ti5O12; the secondary phase is elementary substance of copper or the its oxide of CuxO with general expression of (100-y)Li4Ti5O12 / yCu or CuxO, wherein, y is 0.5-25 w.t%, 1<=x<=2, and the cupper disperses over the crystal boundary; using dry method or water or alcohol as medium to mix materials, baking at temperature of 500-550DEG, holding for 1.5-2h on air or reducing atmosphere, solidifying, and cooling at reducing atmosphere; the Li4Ti5O12 is prepared by solid state reaction, the Cu or CuxO is brought as predecessor. The invention needs low cost and simple to realize.

Description

technical field [0001] The invention relates to a negative electrode material of a lithium secondary battery which can be used for high-rate charging and discharging and a preparation method thereof, belonging to the field of electrochemical power sources. Background technique [0002] Since Japan's Sony Corporation took the lead in developing and commercializing lithium-ion batteries in 1990, lithium-ion batteries, as a new generation of batteries, have achieved rapid development. Nowadays, lithium-ion batteries have been widely used in various fields of civil and military use, and with the continuous advancement of technology, people have put forward more and higher requirements for the performance of batteries: the miniaturization and personalization of electronic equipment require batteries It has smaller volume and higher specific energy output; aerospace energy requires batteries to have longer cycle life, better low-temperature charge and discharge performance and hig...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/04H01M4/02H01M10/40H01M4/485
CPCY02E60/122Y02E60/10
Inventor 温兆银黄莎华顾中华徐孝和
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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