Homologous manganese oxide and spinel-type lithium manganate lithium ion battery and preparation method thereof

Abstract

The invention belongs to the technical field of a lithium ion battery, and particularly relates to a homologous manganese oxide and lithium manganate lithium ion battery on the basis of a nanowire structure. By adopting a two-step hydrothermal method and a high-temperature solid-phase method, a reducing agent and a surface active agent are added into a hydrothermal system, so that the transformation between a manganese oxide nano-sheet array and a nanowire array can be realized. By adding a lithium source in the high-temperature solid reaction process, the preparation of the homologous manganese oxide and spinel-type lithium manganate nanowire can be realized. The homologouos manganese oxide and the spinel-type lithium manganate nanowire can be assembled to form a lithium ion full battery of a nanowire structure. The preparation method comprises the following steps: 1, facilitating the hydrothermal growth of manganese dioxide nano-sheet array; 2, in-situ transforming a hydroxyl manganese oxide nanowire array; 3, preparing manganese sesquioxide and spinel-type lithium manganate nanowire; 4, assembling the full battery. Compared with the lithium ion battery, the source of the raw materials is wide, the preparation process of an anode-cathode material can be simplified, and the anode-cathode material and the lithium ion full battery are both high in specific capacity and good in cycling property.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a homologous manganese oxide and spinel lithium manganate lithium ion battery based on an all nanowire structure and a preparation method thereof. Background technique [0002] Rational design and controllable synthesis of nanowire structure materials have been proved to be an effective way to improve the capacity and cycle performance of lithium-ion battery electrode materials in recent years. Benefiting from the high specific surface area of ​​the nanowire structure, the radial strain relaxation effect, and the high electrical conductivity in the axial direction, many materials, such as carbon, silicon, sulfur, metal oxides, and metal sulfides, are used as nanowire lithium-ion battery materials. It was successfully synthesized and demonstrated to have excellent electrochemical performance. Manganese-based metal oxides such as manganese oxide, manganes...

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Problems solved by technology

However, these two types of materials are often limited by their low electronic conductivity. For negative electrode materials, there is a serious volume expansion during the process of lithium intercalation and deintercalation, which hinders the performance of materials, especially negative electrode materials.

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