Method for preparing anode material of lithium-ion battery

A lithium-ion battery and cathode technology, which is applied in electrode manufacturing, battery electrodes, ion implantation and plating, etc., can solve the problems that have not been seen before, and achieve the effects of low cost, improved discharge specific capacity and good performance

Inactive Publication Date: 2009-09-02
黄河宁 +2
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Problems solved by technology

There have been many reports in the literature on the application of ion implantation technology, but there has been no use of this technology for δ-MnO 2 Related reports on material structure modification to optimize the electrochemical performance of cathode materials for lithium-ion batteries

Method used

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Embodiment Construction

[0013] The first embodiment of the present invention is a method for preparing a positive electrode composite material of a lithium-ion battery. The preparation method includes the following steps:

[0014] (1) Preparation of δ-MnO by pyrolysis in muffle furnace 2 ;The heating rate is 50°C / h. When the temperature rises to 800°C, keep the constant temperature for about 10 hours, and then drop to room temperature at the same rate;

[0015] (2) Preparation of composite material δ-MnO by ion implantation method 2 -Ti; the prepared δ-MnO 2 Grind first and then sieve, then press into tablets with a tablet machine, use the sheet as the matrix, and then implant titanium ions with a MEVVA implanter; the ion implantation energy is 60kV, and the implantation dose is 5×10 17 ion / cm 2 , the purity of titanium ions is >99.9%, the machine-controlled implantation depth is 250nm, the target chamber temperature of the implanted sample is about 150°C, and the implantation time is 2h;

[0016...

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Abstract

The invention discloses a method for preparing anode composite material of a lithium-ion battery, comprising the following steps of preparing delta-MnO2 by adopting a high-temperature decomposition method; preparing composite material delta-MnO2-X by adopting an ion injection method, wherein X is a transition metal element, and injecting transition metal ions into the prepared delta-MnO2 which takes flake-shaped as matrix; preparing the composite material into an anode sheet of the battery; scraping off the delta-MnO2-X formed on the surface layer for being used as anode active material and proportionally mixed with other substances; and preparing the anode sheet of the lithium-ion battery after the steps of film coating, drying, tabletting, parching, weighing and the like. As the ion injection technology is adopted, a certain number of transition metal ions are injected into the surface layer of the laminated MnO2, so as to modify the laminated MnO2, strengthen the electrochemical intercalation/deintercalation capability of the lithium ions to the material, and increase the discharge specific capacity of the laminated MnO2. The prepared lithium-ion battery has the advantages of low cost, good performance and environmental protection.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for preparing δ-MnO by using ion implantation technology 2 -Technical field of Ti lithium ion battery cathode composite material. Background technique [0002] Lithium-ion batteries are also called secondary lithium-ion batteries. The quality of the cathode material is one of the key factors restricting the development of lithium-ion batteries. The existing cathode materials for lithium-ion batteries are LiCoO 2 dominated, although LiCoO 2 It has excellent electrochemical performance, but cobalt resources are scarce, expensive, and polluted. Therefore, people have been looking for alternatives to cathode materials other than cobalt. Manganese oxides have attracted much attention because of their abundant resources, low price, and good environmental protection. Among them, layered manganese dioxide (δ-MnO 2 ) With its good layered structure, it is benefic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/50H01M4/36H01M4/04C01G45/02C23C14/48
CPCY02E60/12Y02E60/10
Inventor 黄河宁张启卫吕东平黄行康
Owner 黄河宁
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