Graphite material for negative electrodes of lithium secondary battery, manufacturing method for said material, and lithium secondary battery using same

A technology of graphite material and secondary battery, applied in secondary batteries, battery electrodes, graphite, etc., can solve the problems of increased reduction and decomposition of electrolyte, capacity deterioration, etc., and achieves inhibition of capacity deterioration, high reliability, and inhibition of capacity maintenance. rate reduction effect
CN103155245AInactive Publication Date: 2013-06-12JX NIPPON OIL & ENERGY CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
JX NIPPON OIL & ENERGY CORP
Publication Date
2013-06-12
Estimated Expiration
Not applicable · inactive patent

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Abstract

Provided is an graphite material for negative electrodes, which is capable of mitigating the capacitance degradation that accompanies repeated charge / discharge cycles, storage in a charged state, and float charging. Provided is a manufacturing method for a graphite material for the negative electrode of a lithium ion secondary battery, wherein the starting material carbon composition has an hydrogen atom to carbon atom atomic ratio (H / C) of 0.30-0.50, and a microstrength of 7-17 mass%.
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Description

technical field

[0001] The invention relates to a graphite material used as a negative electrode of a lithium secondary battery and a manufacturing method thereof. Specifically, it relates to a method for producing a graphite material used in a negative electrode of a lithium ion secondary battery having high durability while suppressing capacity degradation, and a lithium ion secondary battery including a negative electrode using the graphite material. Background technique

[0002] Lithium-ion secondary batteries are lighter in weight and have higher input and output characteristics than conventional secondary batteries such as nickel-cadmium batteries, nickel-metal hydride batteries, and lead batteries. Therefore, in recent years, they have been prepared as power sources for electric vehicles and hybrid vehicles. expected. Generally, such a battery is constructed by opposing a lithium-containing positive electrode capable of reversibly intercalating lithium and a negative...

Claims

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