Detecting method of specific capacity of negative electrode material of lithium ion battery after circulation

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problem that the specific capacity of negative electrode materials is difficult to accurately detect, and achieve the effect of low environmental requirements and guaranteed accuracy
CN102610792AActive Publication Date: 2012-07-25DONGGUAN AMPEREX TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
DONGGUAN AMPEREX TECH
Publication Date
2012-07-25

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Abstract

The invention discloses a detecting method of specific capacity of negative electrode material of a lithium ion battery after circulation. The detecting method comprises the following steps: 1) discharging the lithium ion battery after circulation, then dismantling the battery and taking out a negative electrode plate; 2) washing the negative electrode plate a plurality of times immediately using organic solvent and drying, then putting the negative electrode plate in acidic solution and dipping sufficiently, enabling a negative electrode membrane on the negative electrode plate to fall in the acidic solution; 3) taking out a current collector of the negative electrode plate, then carrying out solid-liquid separation upon the acidic solution in which the negative electrode membrane is dissolved, obtaining solid substance, washing the solid substance repeatedly using de-ionized water till the pH value of filtrate is 6-7, drying in vacuum condition, then grinding and sieving, obtaining graphite powders; and 4) making the lithium ion battery by using the graphite powders as negative electrode material, stewing for two hours and then measuring the specific capacity of the lithium ion battery. In comparison with the prior art, the detecting method has the advantages of low requirement on the environment and high accuracy.
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Description

technical field

[0001] The invention belongs to the field of lithium-ion secondary batteries, in particular to a relatively accurate detection method for the specific capacity of negative electrode materials of lithium-ion batteries after cycles. Background technique

[0002] With the development of modern society, various mobile devices, such as video cameras, notebook computers, portable DVDs and digital cameras, have been used more and more widely, so they have the advantages of light weight, large energy storage, high power, no pollution, and long life. Lithium-ion batteries, which have many advantages, are also favored by people and become the best power source for mobile devices. With the shortage of energy in the world, countries are vigorously developing new energy sources. High-power and pollution-free lithium-ion batteries are used as new energy sources. It has become energy storage batteries and automotive power batteries, which have made the production capacity o...

Claims

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