Lithium ion battery and preparation method thereof

Abstract

The invention discloses a lithium ion battery which comprises a roll, an electrolyte and a shell, wherein the roll comprises a positive plate, a diagram and a negative plate which are sequentially stacked. The positive plate comprises a positive pole current collector and positive pole coatings coated on both sides of the positive pole current collector, and the negative plate comprises a negative pole current collector and negative pole coatings coated on both sides of the negative pole current collector. The positive pole coating comprises a positive pole active matter, a positive pole conductive agent and a positive pole binder at a weight ratio of (98-99%):(0.4-1%):(0.6-1%). The negative pole coating comprises a negative pole active matter, a negative pole thickener, a negative pole binder and a negative pole conductive agent at a weight ratio of (96-97.7%):(0.7-1.2%):(1.3-2.2%):(0.3-0.6%). The invention provides the lithium ion battery which is high in volumetric specific energy by changing the proportion of a negative pole formula and a positive pole formula and adopting matters by virtue of an optimized technological process.

Description

Technical field [0001] The present invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery and a manufacturing method thereof. Background technique [0002] A lithium-ion battery is a rechargeable battery that relies primarily on the movement of lithium ions between the positive and negative electrodes to work. During the charge and discharge process, Li+ intercalates and deintercalates back and forth between the two electrodes: when charging the battery, Li+ deintercalates from the positive electrode and embeds into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; when discharging, the opposite is true. Batteries that generally use materials containing lithium as electrodes are representatives of modern high-performance batteries. [0003] Lithium-ion batteries include steel shell / aluminum shell / cylinder / soft packaging series, including: [0004] (1) Positive electrode:...

AI Technical Summary

Problems solved by technology

[0009] With the continuous progress of lithium-ion batteries, the requirements for energy density are getting higher and higher, and the LFP cathode cannot meet the requirements due to its low voltage and compaction density.

However, due to the need for modification, the power lithium manganese oxide can not exceed 100 gram capacity. If pure ternary is used, although the energy density can reach 200 watt-hours per kilogram, the safety cannot be obtained from the existing technology. Satisfy

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