A kind of ultra-low temperature lithium-ion battery and preparation method thereof

A lithium-ion battery, ultra-low temperature technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of decreased discharge capacity, decreased discharge rate performance, and failure to use normally, so as to improve isotropy and compensate for the decrease in conductivity , The effect of reducing the diffusion resistance
CN108539134BActive Publication Date: 2021-02-05深圳市金力新能源科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
深圳市金力新能源科技有限公司
Publication Date
2021-02-05

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Abstract

The invention discloses an ultra-low temperature lithium ion battery and a preparation method thereof. The invention starts from the perspective of improving the diffusion ability of lithium ions in active materials and electrode interface performance, and effectively improves the lithium ion performance by optimizing the material properties and improving the pulping process. The ionic electrochemical reversibility and low-temperature electrical conductivity improve the electrode specific capacity. The lithium ion battery prepared by the preparation method of the present invention can be discharged at 0.2C under the ultra-low temperature environmental condition of -60°C, the capacity retention rate can still reach more than 80%, and can be charged normally under the temperature condition of -60°C, breaking through the traditional The technical problem that lithium-ion batteries are difficult to use normally at low temperatures below ‑20°C has greatly broadened the application scope of lithium-ion batteries in military equipment.
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Description

technical field

[0001] The invention relates to a lithium ion battery, in particular to an ultra-low temperature lithium ion battery and a preparation method thereof. Background technique

[0002] As a new generation of green energy, lithium-ion batteries have the advantages of high working voltage, long cycle life, light weight, high energy density, good rate performance and safety performance, small self-discharge, no memory effect, and no environmental pollution. Applied to various fields such as electronics, transportation, medical treatment, aviation, etc., with the continuous expansion of the application field and application range, higher requirements are put forward for the performance of the battery. However, the low-temperature discharge performance of traditional lithium-ion batteries is poor, especially the low-temperature charging performance. Most lithium batteries are difficult to use normally below -20°C, which greatly restricts their use in high latitudes, h...

Claims

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