Preparation method of layered manganese-based cathode material for raising initial charge/discharge efficiency

A technology of charge-discharge efficiency and positive electrode material is applied in the field of preparation of positive electrode active materials for lithium-ion batteries, which can solve the problems of phase composition control of transition metal ions, deviation of transition metal ion ratio from stoichiometry, waste of raw materials, etc., so as to improve the first charge-discharge efficiency. , Precise control of chemical composition, improved charge-discharge efficiency and cycle stability
CN102447103AInactive Publication Date: 2012-05-09UNIV OF SCI & TECH BEIJING
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
UNIV OF SCI & TECH BEIJING
Publication Date
2012-05-09
Estimated Expiration
Not applicable · inactive patent

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Abstract

A preparation method of a layered manganese-based cathode material for raising initial charge / discharge efficiency comprises the following steps of: using ammonium bicarbonate as a precipitating agent, simultaneously adding ammoniacal liquor in a dropwise manner so as to control coprecipitation reaction pH value to 8-9, continuing for 8-12 hours, precipitating a coprecipitation product, adding deionized water to prepare a slurry with the concentration of 150-200g / l, carrying out spray drying on the slurry at the temperature of 100-120 DEG C to prepare a Ni-Mn carbonate powder, insulating at the temperature of 300-350 DEG C for 4-6 hours, heating up to 450-500 DEG C and insulating for 2-4 hours to obtain a precursor powder, weighing lithium hydroxide monohydrate with its mole number being K[1+x / (2+x)], grinding the prepared xLi2MnO3.(1-x)LiNi1 / 2Mn1 / 2O2 powder, roasting at the temperature of 600-650 DEG C for 1-6 hours, and annealing. According to the invention, the initial charge / discharge efficiency of the layered manganese-based cathode material is substantially raised, and the cycle stability is obviously improved.
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Description

[0001] technical field

[0002] The invention belongs to the technical field of preparation of positive electrode active materials for lithium ion batteries, and in particular relates to a preparation method of a positive electrode material which improves the first charge and discharge efficiency and cycle stability of a layered manganese-based positive electrode material. Background technique

[0003] In view of the different performance requirements of different types of new energy vehicles (EV, HEV and PHEV, etc.) that have been booming in recent years, the technical research on the large-scale industrialization of power batteries has been further refined into energy-type power battery modules and power with both energy and power. Development of battery systems. Layered manganese-based cathode material xLi 2 MnO 3 ·(1-x)LiNi 1 / 2 mn 1 / 2 o 2 , where 0￡ x ￡0.5 is calculated according to the standard that an electron undergoes a charge-discharge reaction, and its theoret...

Claims

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