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Novel lithium ion battery negative electrode material and preparation method thereof

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve problems such as difficulty in meeting high energy, high power density, limiting the application of silicon materials, and low compaction density, and achieve stability Structure, high stability, and long cycle life

Active Publication Date: 2022-01-28
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

Due to the poor rate performance and low compaction density of traditional graphite anodes, it is difficult to meet the requirements of high energy and high power density
The theoretical lithium intercalation capacity of silicon is 4200mA h / g, and it has always been a popular candidate for the negative electrode of the next generation of lithium-ion batteries. Limits the application of silicon materials

Method used

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  • Novel lithium ion battery negative electrode material and preparation method thereof
  • Novel lithium ion battery negative electrode material and preparation method thereof
  • Novel lithium ion battery negative electrode material and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0031] This embodiment prepares lithium-ion battery anode material Ni-Li according to the following steps 0.33 La 0.56 TiO 3-a @C:

[0032] Step 1: Add 0.0363mol of lithium nitrate (10% excess), 0.055mol of lanthanum nitrate, 0.09mol of tetrabutyl titanate and 0.01mol of nickel nitrate into 900mL of ethanol solution containing 0.282mol of citric acid, mix well and place in 80 °C in a water bath, stirred and evaporated to dryness to a gel state to obtain a precursor gel.

[0033] Step 2: Dry the precursor gel in an oven at 150°C for 12 hours and grind to obtain the precursor powder;

[0034] Step 3: Pretreat the precursor powder at 500° C. for 6 hours in an air atmosphere, and grind to obtain pretreated powder.

[0035] Step 4: Pre-sinter the pre-treated powder at 1000°C for 3 hours in an air atmosphere to obtain the pre-sintered powder, which is Li 0.33 La 0.56 Ti 0.9 Ni 0.1 o 3-a perovskite material. figure 1 (a) Its XRD spectrum shows that the material is a perovsk...

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Abstract

The invention discloses a novel lithium ion battery negative electrode material and a preparation method thereof. The chemical general formula of the negative electrode material is X-Li<x>A<y>BO<3-a>@C. One-step reduction and carbonization treatment are performed on Li<x>A<y>B<1-z>X O<3-a> perovskite nanoparticles of which the bulk phase is uniformly distributed with transition metal X, so that the transition metal X in perovskite crystal lattices is subjected to desolvation reaction; therefore, the negative electrode material is formed by embedding a plurality of discrete transition metal X nano-particles on the surfaces of perovskite nano-particles coated with carbon layers. The lithium ion battery negative electrode material provided by the invention is long in cycle life, high in stability, good in rate capability and high in volume specific capacity, and is an ideal negative electrode material of a lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field related to lithium ion batteries, and in particular relates to a novel lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] The growing market for portable electronics and electric vehicles has greatly influenced the technological revolution of lithium batteries (LBs) towards high energy and high power density. Due to the poor rate performance and low compaction density of traditional graphite anodes, it is difficult to meet the requirements of high energy and high power density. The theoretical lithium intercalation capacity of silicon is 4200mA h / g, and it has always been a popular candidate for the negative electrode of the next-generation lithium-ion battery. However, problems such as poor cycle performance caused by its huge volume expansion (≥400%) during the cycle are also serious The application of silicon materials is limited. [0003] The...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/485H01M4/50H01M4/505H01M4/52H01M4/525H01M4/583H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/366H01M4/483H01M4/485H01M4/502H01M4/505H01M4/523H01M4/525H01M4/583H01M10/0525B82Y30/00B82Y40/00H01M2004/027Y02E60/10
Inventor 陈春华王浚儒王蒙蒙
Owner UNIV OF SCI & TECH OF CHINA
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