Novel titanate capable being used as lithium ion secondary battery cathode material

A negative electrode material and secondary battery technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve problems such as unsuitable for large-scale industrial use, small battery application range, and full battery voltage drop, and achieve cheap raw materials and good processing Performance, Effect of High Operating Voltage

Inactive Publication Date: 2014-05-21
RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the high potential of lithium titanate itself, the voltage of the full battery using it as the negativ

Method used

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  • Novel titanate capable being used as lithium ion secondary battery cathode material
  • Novel titanate capable being used as lithium ion secondary battery cathode material
  • Novel titanate capable being used as lithium ion secondary battery cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Li 2.1 SrTi 6 o 14 preparation

[0031] Lithium carbonate, anatase titanium dioxide and strontium carbonate are selected as raw materials, and the ingredients are mixed according to the molar ratio Li:Sr:Ti=2.1:1:6. After mixing, they are placed in an atmosphere furnace, and the temperature is raised at 5°C / min in an air atmosphere. Raise the speed to 700°C, keep it warm for 8 hours, and then cool it down to room temperature naturally. After grinding and pulverizing, put the powder in the atmosphere furnace, and heat it up to 1000°C in the air atmosphere for 24 hours, and then cool it down to room temperature naturally to get Pale yellow product. figure 1 Its X-ray diffraction pattern, Figure II Its scanning electron microscope (SEM) photo, its charge-discharge voltage-capacity curve for Li+ / Li is image 3 .

Embodiment 2

[0033] Li 2.1 SrTi 6 o 14 preparation of

[0034] Lithium carbonate, anatase titanium dioxide and strontium hydroxide are selected as raw materials, and the molar ratio is Li:Sr:Ti=2.1:1:6. After mixing, they are placed in an atmosphere furnace. Raise the heating rate to 700°C, keep it warm for 8 hours, and then cool it down to room temperature naturally. After grinding and pulverizing, put the powder in an atmosphere furnace, and heat it up to 1000°C in an air atmosphere for 24 hours, and then cool it down to room temperature naturally. A pale yellow product was obtained.

Embodiment 3

[0036] Li 2.1 Sr 0.98 Mg 0.02 Ti 6 o 14 preparation of

[0037] Lithium carbonate, anatase titanium dioxide, strontium carbonate and magnesium hydroxide are selected as raw materials, and the ingredients are mixed according to the molar ratio Li:Sr:Mg:Ti=2.1:0.98:0.02:6. The temperature was raised to 700°C at a rate of 5°C / min, kept at a temperature of 8 hours, and then cooled to room temperature naturally. After being ground and pulverized, the powder was placed in an atmosphere furnace, and heated to 1000°C in an air atmosphere for 24 hours. After cooling naturally to room temperature, a pale yellow product can be obtained.

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Abstract

The invention provides a novel titanate capable of being used as a lithium ion secondary battery cathode active material. The general formula of the active material is Li2+xSrmM1-mTi5+nN1-nO14-y, wherein M is one or the combination selected from Al, Ba, Ca, Ce, Cs, La, Mg, K, Na, Sr, Mn and Sn, N is one or the combination selected from Mn, Ti, Co, Zr and V, x is greater than or equal to 0 and is less than or equal to 0.5, m is greater than or equal to 0 and is less than or equal to 1, n is greater than or equal to 0 and less than or equal to 1, and y is greater than or equal to 0 and is less than or equal to 1. The Li+/Li operating voltage from the material is 0.8-1.45V, and the metal Li potential is low compared with a lithium titanate material; when the novel titanate is paired with lithium manganate or cobalt acid lithium, the operation voltage higher than that of a battery taking lithium titanate as a negative electrode is obtained, and the safety problem of battery short circuit due to formation of lithium dendrites caused by separation of lithium metal is solved.

Description

technical field [0001] The invention relates to the field of clean energy, and provides a novel titanate that can be used as the negative electrode active material of a lithium ion secondary battery and a preparation method thereof. Background technique [0002] With the intensification of the energy crisis and the environmental problems caused by the use of "fossil fuels", secondary lithium-ion batteries, as a new type of clean energy, have attracted more and more attention from research institutions and new energy companies, and governments of various countries have also stepped up their efforts. Great support for this battery research and development. [0003] At present, the application range of secondary lithium-ion batteries is becoming wider and wider, and has been successfully applied to mobile phones, notebook computers, electric vehicles and energy storage projects. With the deepening of research and development and the inspection of practical applications, a seri...

Claims

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Application Information

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IPC IPC(8): H01M4/485
CPCH01M4/485Y02E60/10
Inventor 王兴勤高云李雅楠孙小嫚刘建红吴宁宁
Owner RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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