Coating structure applicable to high-voltage charge-discharge and manufacturing method of coating structure

A coating structure and manufacturing method technology, applied to battery electrodes, structural parts, circuits, etc., can solve the problems of energy density decline, fast capacity decay, cycle performance degradation, etc., and achieve high-temperature storage performance improvement, good cycle and safety performance , the effect of high energy density
CN102931384AActive Publication Date: 2013-02-13DONGGUAN AMPEREX TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
DONGGUAN AMPEREX TECH
Publication Date
2013-02-13

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Abstract

The invention relates to the technical field of lithium ion batteries, in particular to a coating structure applicable to high-voltage charge-discharge and a manufacturing method of the coating structure. A first metal oxide layer and a second metal oxide layer coat the surface of a cathode material layer, the first metal oxide layer coats the surface of the cathode material layer, the second metal oxide layer coats the outer surface of the first metal oxide layer, and the weight of the first metal oxide layer occupies 40 to 70 percent of the total weight of the first metal oxide layer and the second metal oxide layer. The coating structure contains active substances, so the first charge-discharge efficiency of a material is improved; by a surface ceramic oxide layer, corrosion of hydrogen fluoride (HF), release of metal ions and extraction of active oxygen are well inhibited; and a lithium ion secondary battery with the structure is applicable to charge-discharge at high voltage of more than 4.30 V, high in energy density, high in cycle performance and high in safety performance, and high-temperature storage performance is greatly improved.
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Description

technical field

[0001] The invention relates to the technical field of lithium-ion batteries, in particular to a coating structure suitable for high-voltage charging and discharging and a manufacturing method thereof. Background technique

[0002] The ternary lithium-nickel-cobalt-manganese (NCM) material has attracted extensive attention from researchers because of its high capacity (up to 250 mAh / g, 91% of the theoretical capacity), good safety, and low price. However, due to the existence of high-valent nickel during the charge and discharge process, the surface structure of the ternary lithium nickel cobalt manganese material is unstable, and it is easily corroded by HF in the electrolyte during the high voltage charge and discharge process, which makes the capacity decay faster, limiting for its use at high voltages. At present, the main method to solve these problems is to coat the surface of ternary lithium nickel cobalt manganese, which can effectively alleviate the...

Claims

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