Preparation method of large single crystal lithium ion battery nickel cobalt lithium manganate cathode material

A nickel-cobalt lithium manganese oxide and lithium-ion battery technology, which is applied in the field of lithium-ion power batteries for new energy vehicles, can solve the problems of low initial efficiency, low discharge capacity, and low capacity, and achieve less surface defects, clear particles, and thicker uniform effect
CN110534733AInactive Publication Date: 2019-12-03ZHEJIANG MEIDU HITRANS LITHIUM BATTERY TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
ZHEJIANG MEIDU HITRANS LITHIUM BATTERY TECHNOLOGY CO LTD
Publication Date
2019-12-03
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a preparation method of a single crystal lithium ion battery nickel cobalt lithium manganate cathode material. The method comprises the following steps of: (1) taking a small-grain crystal spherical NCM ternary precursor, a lithium salt and an A element-containing nano fluxing agent as raw materials, uniformly mixing the raw materials by adopting a dry-method high-speed mixing mode, and performing primary sintering under an oxygen-enriched atmosphere condition; (2) subjecting the sintered material to jaw breaking, roller pairing, crushing and sieving so as to obtain asingle-crystal once-sintered base material; and (3) mixing the primary sintering base material with a B element-containing nano coating agent, sintering again under an oxygen-enriched atmosphere condition, and then performing jaw breaking, roller pairing, crushing and sieving to obtain the large single crystal lithium nickel cobalt manganate cathode material. The cathode material prepared by the invention has the characteristics of the large particle size, the good dispersity, the moderate specific surface area, the high compaction density, the high voltage, the good high-temperature cycle performance and the like.
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Description

Technical field

[0001] The invention relates to the technical field of lithium ion power batteries for new energy vehicles, in particular to a method for preparing a large single crystal lithium ion battery nickel cobalt lithium manganate anode material. Background technique

[0002] Since 2013, domestic new energy vehicle subsidies have maintained an overall downward trend; in 2018, financial subsidies for vehicles with a driving range of less than 150km will be suspended, while subsidies for vehicles with a high driving range will increase. This is a major part of the new subsidy policy in 2018. Features; however, in 2019, financial subsidies for vehicles with a driving range of less than 250km will cease to be issued, and the subsidy for models with a high driving range will decline rapidly on the basis of 2018.

[0003] In 2019, the subsidy declined sharply, leading the market to put forward higher requirements for new energy vehicle power batteries, such as: high safety, high ...

Claims

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