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Cathode active substance of lithium secondary battery and preparation method thereof

A negative electrode active material and secondary battery technology, applied in battery electrodes, electrode manufacturing, circuits, etc., can solve the problems of low specific capacity of batteries, achieve the effects of increased specific capacity, simple preparation process, and low production cost

Inactive Publication Date: 2010-06-09
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the defect of low specific capacity of the battery prepared by using the lithium vanadium oxide of the prior art, to provide a negative electrode active material that makes the battery have a higher volume specific capacity and its preparation method

Method used

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  • Cathode active substance of lithium secondary battery and preparation method thereof
  • Cathode active substance of lithium secondary battery and preparation method thereof
  • Cathode active substance of lithium secondary battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] This example is used to illustrate the preparation of the negative electrode active material lithium vanadium oxide provided by the present invention.

[0039] 81.28 lithium carbonate, 163.69 grams of vanadium pentoxide, 45.6 grams of sucrose and 1.60 grams of titanium dioxide are placed in a ball mill jar, mixed with 280 milliliters of absolute ethanol, so that the reactant can be completely dispersed in ethanol, and the mixture is mixed on a planetary ball mill at 350 The precursor mixture was obtained after ball milling at a rotational speed of rpm for 15 hours. The precursor mixture was air-dried and ball-milled for a second time for 5 hours to obtain a dispersed powder. Put the obtained dispersed powder into a crucible, put it in an argon atmosphere protection heat treatment furnace, raise the temperature to 850°C, keep it warm for 15 hours, cool naturally to below 100°C, take it out, and obtain the negative electrode active material after sieving. The carbon cont...

Embodiment 2

[0042] This example is used to illustrate the preparation of the negative electrode active material lithium vanadium oxide provided by the present invention.

[0043] 81.28 grams of lithium carbonate, 163.69 grams of vanadium pentoxide, 52.85 grams of glucose and 1.60 grams of titanium dioxide are placed in a ball mill jar, mixed with 270 milliliters of absolute ethanol, so that the reactant can be completely dispersed in ethanol, and placed on a planetary ball mill with The precursor mixture was obtained after ball milling at 350 rpm for 15 hours. The precursor mixture was air-dried and milled twice for 5 hours to obtain a dispersed powder. Put the obtained dispersed powder into a crucible, put it in an argon atmosphere protection heat treatment furnace, raise the temperature to 800°C, keep it warm for 15 hours, cool it naturally to below 100°C, take it out, and obtain the negative electrode active material after sieving. The carbon content in the produced negative electrode...

Embodiment 3

[0045] This example is used to illustrate the preparation of the negative electrode active material lithium vanadium oxide provided by the present invention.

[0046] Put 81.28 grams of lithium carbonate, 163.69 grams of vanadium pentoxide, 19.2 grams of PH15B graphite and 1.60 grams of titanium dioxide in a ball mill jar and mix them with 290 milliliters of absolute ethanol so that the reactants can be completely dispersed in ethanol. The precursor mixture was obtained after ball milling at 350 rpm for 15 hours. The precursor mixture was air-dried and milled twice for 5 hours to obtain a dispersed powder. Put the obtained dispersed powder into a crucible, put it in an argon atmosphere protection heat treatment furnace, raise the temperature to 850°C, keep it warm for 12 hours, cool it naturally to below 100°C, take it out, and obtain the negative active material after sieving. The carbon content in the produced negative electrode active material was 3.8% by weight. Li 2 V ...

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Abstract

The invention discloses a cathode active substance of a lithium secondary battery, wherein the cathode active substance contains a lithium vanadium oxide and carbon, and the lithium vanadium oxide comprises LiVO2 and Li2V2O4. The cathode active substance of a lithium vanadium oxide mixed crystal can improve the specific capacity of the battery, has simple procedures for a preparation process and low production cost, and is suitable for industrial production.

Description

technical field [0001] The invention relates to a lithium ion secondary battery negative electrode active material and a preparation method thereof, more specifically, the invention relates to a lithium ion secondary battery negative electrode active material lithium vanadium oxide and a preparation method thereof. Background technique [0002] Lithium-ion battery, as a new type of green battery, has been gradually replacing the traditional secondary batteries due to its advantages of high working voltage, light weight, large specific energy, small self-discharge rate, long cycle life, no memory effect, and no environmental pollution. The position of secondary batteries such as lead-acid batteries, nickel-cadmium batteries, and nickel-metal hydride batteries has become an ideal power source for small and lightweight electronic devices such as cameras, mobile phones, notebook computers, and portable measuring instruments, as well as environmentally friendly electric vehicles. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/04
CPCY02E60/12Y02E60/10
Inventor 杨玮徐茶清姜占锋
Owner BYD CO LTD
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