Secondary lithium ionic cell positive electrode active material with Li*O 2B*O* coated on surface

A technology for positive electrode active materials and lithium-ion batteries, applied in electrode manufacturing, battery electrodes, circuits, etc., can solve the problems of less research on positive electrode active materials for secondary lithium-ion batteries, and achieve a feasible preparation method, good effect, and good cycle performance Reduced effect

Inactive Publication Date: 2009-02-04
NINGBO JINHE NEW MATERIALS
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Problems solved by technology

[0010] In the report disclosed above, Li 2 O·2B 2 o 3 to LiCoO 2 , LiMn 2 o 4 or LiNiO 2 There are few studies on the surface coating of transition metal lithium oxide particles to make positive electrode active materials for secondary lithium ion batteries

Method used

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  • Secondary lithium ionic cell positive electrode active material with Li*O 2B*O* coated on surface

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Embodiment

[0022] LiOH·H 2 O, H 3 BO 3Mix with the positive electrode material of the secondary lithium ion battery in a mass ratio of 5 to 10:14.6:1000, carry out ball milling on a planetary ball mill, put the mixture into a ceramic flat-bottomed bowl and carry out high temperature treatment, and the heat treatment atmosphere is a mixture of air or oxygen and air. Heating and heat preservation treatment, the heating rate is 5-20°C / h, the heat preservation range is 200-550°C, and the heat preservation time is 1-10h; The time is 1-15 hours; the ceramic flat-bottomed bowl containing the fully reacted compound is cooled at a rate of 10-20 / min. When it is lowered to room temperature, the compound in the ceramic flat-bottomed bowl is poured out and sieved to obtain 1% wt surface coated with Li 2 O·2B 2 o 3 Cathode material particles for secondary lithium ion batteries.

[0023] Surface coated Li in positive electrode materials 2 O·2B 2 o 3 The positive electrode active material, the ...

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Abstract

The invention relates to a secondary lithium ion battery positive active material with the surface coated with Li2O-2B2O3 as well as a preparation method thereof designed for solving the technical problem of electrochemical stability of the existing secondary lithium ion battery under high temperature. The positive active material has the design points: the transition metal lithium oxide particle positive active substance with the surface coated with Li2O-2B2O3, a conductive agent and a binder are present in weight percentages of: 96 to 10 percent, 2 to 5 percent, and 2 to 5 percent respectively. The preparation method comprises: LiOH-H2O, H3BO3 and transition metal oxides are under ball-mill mixing in a certain proportion, wherein, LiOH-H2O and H3BO3 are present in a molar ratio of 1: 2-1: 1, and the secondary calcination method is adopted to obtain a transition metal lithium oxide particle with the surface coated with Li2O-2B2O3. The surface physical and chemical characters of the positive active material are changed, and the preparation method is feasible and is applied to the development and application of similar products.

Description

technical field [0001] The invention relates to a modified lithium ion positive electrode active material, which is a surface-coated Li 2 O·2B 2 o 3 A positive electrode active material for a secondary lithium ion battery and a preparation method thereof. Background technique [0002] Due to the advantages of high specific energy, relatively stable discharge voltage, no memory effect, and environmental protection, secondary lithium-ion batteries are widely used in mobile communications, portable audio-visual equipment and laptop computers. With the continuous enhancement of the functionalization of communication mobile electronic products and the development of secondary lithium-ion batteries to the field of small electric tools, higher requirements are put forward for the energy density, safety performance, cycle life and rate discharge of secondary lithium-ion batteries. requirements, and the cost performance of these aspects is mainly limited by the cathode material. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/48H01M4/04B22F1/02H01M4/62
CPCY02E60/10
Inventor 王小兰何金华周汉章陈珍华黄连友
Owner NINGBO JINHE NEW MATERIALS
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