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Chromium-base negative electrode active material for secondary lithium battery

A negative electrode active material and secondary lithium battery technology, applied in secondary batteries, battery electrodes, lithium storage batteries, etc., can solve the problems of cycle and low charge and discharge efficiency, and achieve high charge and discharge efficiency, good cycle, high Conductive effect

Inactive Publication Date: 2006-05-17
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The object of the present invention is to overcome the negative electrode material cycle and the low defect of charging and discharging efficiency of the existing secondary lithium battery, thereby improve Cr by heteroatom doping 2 o 3 Electron conductance to significantly improve the electrochemical performance of this type of material, or form a composite material with a core-shell structure with carbon to further improve its electrochemical performance, providing a secondary lithium battery with higher charge and discharge Chromium-based negative electrode active materials for secondary lithium batteries with good capacity and good cycle characteristics and safety

Method used

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  • Chromium-base negative electrode active material for secondary lithium battery
  • Chromium-base negative electrode active material for secondary lithium battery
  • Chromium-base negative electrode active material for secondary lithium battery

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Embodiment 1, the negative electrode active material 1 of the chromium oxide of Li doping is prepared using liquid phase method

[0035] A certain amount of CrCl 3 Prepare a 1M aqueous solution with lithium nitrate according to the stoichiometric ratio shown in Table 1, heat it in a water bath to 50°C, add ammonia water dropwise to the above aqueous solution under vigorous stirring, and control the pH value at about 9.0. The obtained precipitate was separated by filtration five times with deionized water, and then dried at 100° C. for 12 hours. The dried precursor was pre-fired in an air atmosphere at 300 °C in a muffle furnace for 5 hours. Take out the ball mill and press into tablets. Then calcined at 500° C. for 6 hours and cooled to room temperature to obtain a series of final products of the negative electrode active material 1 for secondary lithium battery of the present invention, the average particle diameter of which is 50 nm.

[0036] In order to study the ...

Embodiment 2

[0043] Example 2, Preparation of Li-doped chromium oxide / carbon core-shell structure composite material 2 by pyrolysis method

[0044](1) the product 1 prepared in Example 1 is mixed with carbon black (average particle diameter is 40 nanometers) as conductive additive in a weight ratio of 10:1, mechanical ball milling (rotating speed is 500 rev / min, 6 hours), Obtain internal composite particles; (2) mechanically grind the internal composite particles and sucrose at a weight ratio of 1:1 (rotating speed is 150 rpm, 1 hour), to obtain a uniformly dispersed mixture; (3) mix the mixture at high Pyrolysis under pure nitrogen, the steps of pyrolysis are: first use 4 hours to raise the temperature from room temperature to 400°C, then use 10 hours to raise the temperature from 400°C to 700°C, then keep the temperature at 700°C for 12 hours, and finally use 2 hours to cool down to At room temperature, the internal composite particles coated with the pyrolytic carbon layer were obtained...

Embodiment 3

[0046] Embodiment 3, the negative electrode active material 3 of the Ag-doped chromium oxide prepared by liquid phase method

[0047] According to the stoichiometric ratio shown in Table 1, a certain amount of CrCl 3 The negative active material 3 of Ag-doped chromium oxide was prepared by liquid phase method with silver nitrate, except that the dried precursor was calcined at 800°C for 12 hours, and the other parameters were the same as in Example 1, and a series of the present invention were obtained. The final product of the inventive negative electrode active material 3 for secondary lithium batteries has an average particle size of 200 nanometers.

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Abstract

A Cr based negative electrode active material used on secondary lithium cell is oxide Cr2 ¿C xMxO3 of transition metal Cr doped with varied atoms as 0.001 not greater than x not greater than 1.5, M being li, Ag, mg, Ni, Cu, Zn, Sn, Co, Fe, Ca, Sr, Ti, Mn , Ce, Mo or Zr, material particle diameter being 50nm to 20 micron. The said material also can include conductive additives with the amount of 1 ¿C 20 wt% to said material, or can have carbon film shell on said material core, or can apply 20 ¿C 98 wt % ratio to mix with existing negative electrode material for being used as negative electrode material of secondary lithium cell.

Description

technical field [0001] The invention relates to a chromium-based negative electrode active material for a secondary lithium battery. Background technique [0002] Among the negative electrode active materials of the secondary lithium battery, the theoretical specific capacity of metal lithium is 3830mAh / g, so the energy density of the secondary lithium battery using metal lithium as the negative electrode active material is the highest. However, dendrite growth occurs in the negative electrode of the metal secondary lithium battery during charging and discharging, which causes the internal short circuit of the battery, causing the battery to burn or even explode. In order to improve its safety, from the early 1970s to the end of the 1980s, lithium alloys such as lithium aluminum, lithium silicon, lithium lead, lithium tin, and lithium cadmium were used to replace metallic lithium as negative electrode active materials. To a certain extent, the problem of dendrite growth is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/02H01M4/58H01M4/62H01M10/40
CPCH01M4/485H01M4/505H01M4/525H01M10/052Y02E60/10
Inventor 胡进李泓黄学杰陈立泉
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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