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Lithium ion battery and anode strip thereof and stabilization lithium metal powder

A lithium metal powder and stabilization technology, which is applied in non-aqueous electrolyte battery electrodes, secondary batteries, electrochemical generators, etc., can solve problems such as hindering electron and lithium ion transmission, dead lithium, and reducing pre-lithiation efficiency. Achieve good electronic and lithium ion conductivity, improve electronic and ionic conductivity, and improve electrochemical performance

Active Publication Date: 2014-07-23
NINGDE AMPEREX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the actual application process, on the one hand, due to the inhomogeneous particle size of the stabilized lithium metal powder, it cannot be guaranteed that all the lithium metal powder shells are crushed during the cold pressing process, and the lithium inside the unbroken lithium metal particles cannot participate in the process. The lithiation process of the active material leads to the existence of "dead lithium", which reduces the efficiency of pre-lithiation. On the other hand, the electron or ion insulating shell remaining on the anode sheet after pre-lithiation will hinder the electrons and lithium ions in the electrode. The transport in the chip will have a certain impact on the electrochemical performance of the battery

Method used

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  • Lithium ion battery and anode strip thereof and stabilization lithium metal powder
  • Lithium ion battery and anode strip thereof and stabilization lithium metal powder
  • Lithium ion battery and anode strip thereof and stabilization lithium metal powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Preparation of lithium metal powder

[0042] Under an argon protective atmosphere, 30 g of battery-grade lithium metal was cut into small pieces of 1 × 1 cm, which were added to a stainless steel reactor with high-speed stirring function, and the bottom and top of the reactor had heating jackets. 120 g of high-boiling hydrocarbon oil was added to the reactor, and the temperature was raised to 200° C. at a stirring speed of 500 rpm. During this process, the circulation of Ar gas was always maintained. After all the lithium metal is melted, stir the mixture at 8000rpm for 3min, add 1.0g of oleic acid into the reactor, continue stirring at high speed for 5min, reduce the stirring speed to 300rpm, and the temperature to 150°C, add 0.45g of oleic acid to the reactor Conductive carbon fiber, the conductive carbon fiber has been surface sensitized with acid in advance to improve the binding force between it and the lithium metal core, after stirring at a high speed of 8000rpm ...

Embodiment 2

[0045] Different from Example 1 is the preparation of lithium metal powder:

[0046] Under an argon protective atmosphere, 30 g of battery-grade lithium metal was cut into small pieces of 1 × 1 cm, which were added to a stainless steel reactor with high-speed stirring function, and the bottom and top of the reactor had heating jackets. 120 g of high-boiling hydrocarbon oil was added to the reactor, and the temperature was raised to 200° C. at a stirring speed of 500 rpm. During this process, the circulation of Ar gas was always maintained. After all the lithium metal is melted, stir the mixture at 8000rpm for 3min, add 1.0g of oleic acid into the reactor, continue stirring at high speed for 5min, reduce the stirring speed to 300rpm, and the temperature to 150°C, add 0.45g of oleic acid to the reactor Conductive carbon fiber and 0.3g nano TiO 2 The mixed dry powder is obtained by ball milling, and the surface of the conductive carbon fiber is sensitized with acid before mixing...

Embodiment 3

[0049] Different from Example 1 is the preparation of lithium metal powder:

[0050] Under an argon protective atmosphere, 30 g of battery-grade lithium metal was cut into small pieces of 1 × 1 cm, which were added to a stainless steel reactor with high-speed stirring function, and the bottom and top of the reactor had heating jackets. 120 g of high-boiling hydrocarbon oil was added to the reactor, and the temperature was raised to 200° C. at a stirring speed of 500 rpm. During this process, the circulation of Ar gas was always maintained. After all the lithium metal is melted, stir the mixture at 8000rpm for 3min, add 1.0g of oleic acid into the reactor, continue stirring at high speed for 5min, reduce the stirring speed to 300rpm, and the temperature to 150°C, add 0.45g of oleic acid to the reactor The mixed dry powder of carbon nanotubes and 0.3g nano-silicon oxide, the mixed powder is obtained by ball milling, and the carbon nanotubes are surface sensitized with acid befor...

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Abstract

The invention belongs to the technical field of a lithium ion battery, and particularly relates to stabilization lithium metal powder. The stabilization lithium metal powder has a core shell structure; and the core layer is formed by lithium metal and is a composition consisting of an electron good conductor and a lithium ion good conductor. Compared with the prior art, the stabilization lithium metal powder provided by the invention has the advantages that: in the process of performing pre-lithiation of the anode-active material by use of the stabilization lithium metal powder, no limitation is imposed on the pressure of the cold pressing process, the 'dead lithium' disabling lithiation reaction is not produced, and the lithiation efficiency of the lithium metal powder is improved; and moreover, since the shell layer left on the electrode surface has good electron and lithium ion conductivity after the pre-lithiation, the electron and ion conductivity of the anode can be effectively improved so as to improve the electrochemical performance of the battery. In addition, the invention also discloses an anode strip performing pre-lithiation by use of the stabilization lithium metal powder, and a lithium ion battery comprising the anode strip.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a stabilized lithium metal powder with a composite conductive shell, an anode sheet using the stabilized lithium metal powder for pre-lithiation treatment, and a lithium ion battery containing the anode sheet . Background technique [0002] The wide application of lithium-ion batteries at this stage puts forward higher requirements on the energy density of lithium-ion batteries. In a lithium-ion battery system, the initial charge-discharge efficiency is mainly determined by the initial efficiency of the anode. Therefore, increasing the initial efficiency of the anode can effectively improve the initial efficiency and amplified capacity of the battery, thereby increasing the energy density of the battery. [0003] At present, there have been reports of improving the first efficiency of the anode by pre-supplementing lithium at the anode. Patent applicati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02H01M4/13H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 李伟阳先明
Owner NINGDE AMPEREX TECH
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