Lithium-battery negative electrode material applicable to starting-stopping power supply, lithium-ion battery and preparation method thereof

Abstract

The invention belongs to the technical field of lithium-ion batteries and relates to a lithium-battery negative electrode material applicable to a starting-stopping power supply, a lithium-ion batteryand a preparation method thereof. The lithium-battery negative electrode material applicable to the starting-stopping power supply is prepared from the following raw materials in percent by weight: 93%-97% of negative-electrode active substance, 0.4%-3% of conducting agent, 0.4%-3% of binding agent and 0.4%-3% of CMC (Carboxyl methyl Cellulose) gum, wherein the negative-electrode active substanceis prepared from one or more of artificial graphite, soft carbon and hard carbon. The lithium-battery negative electrode material has the beneficial effects that the low-temperature charging and discharging performances of the lithium-ion battery are improved, the working temperature range of the battery is expanded, the problem that the lithium-ion battery can not work normally due to large-ratedischarge under low-temperature and normal-temperature conditions is relieved, and the safety and the reliability for adopting the lithium-ion battery as the automobile starting-stopping power supplyare improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium battery negative electrode material suitable for starting and stopping power supplies, a lithium ion battery and a preparation method thereof. Background technique [0002] In the existing secondary battery system, lithium-ion batteries are currently the most competitive secondary batteries in terms of development space and technical indicators such as life, specific energy, working voltage and self-discharge rate. Lithium-ion batteries have the advantages of high working voltage, high energy density, long cycle life, low self-discharge rate, and environmental protection, and have become the development trend of secondary batteries; they have been widely used in wireless communications, digital cameras, notebook computers and other portable appliances. Power supply, and has broad application prospects as a power supply for special applications ...

AI Technical Summary

Problems solved by technology

[0008] The second object of the present invention is to provide a lithium-ion battery, which improves the low-temperature charge and discharge performance, increases the operating temperature range, effectively improves the high-current rate performance, and alleviates the problem of high-rate discharge and lithium-ion battery under low temperature and normal temperature conditions. The problem of not working properly improves the safety and reliability of using lithium-ion batteries as a car start-stop power supply

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