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Energy storage composite particle, battery negative electrode material and battery

A composite particle and energy storage technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as high irreversible capacity, reduced lithium battery usability, and fragmentation of silicon-based negative electrode materials, achieving high gram capacitance, Long cycle life, anti-fragmentation effect

Active Publication Date: 2015-07-01
IND TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, silicon-based anode materials have the characteristics of high irreversible capacity, and silicon-based anode materials will produce 400% volume expansion after charging
[0005] In more detail, during the charging and discharging process of lithium batteries, the silicon-based negative electrode material will expand and shrink due to the lithium ion intercalation / intercalation of the silicon-based negative electrode material, which will cause the silicon-based negative electrode material to break. Increases the internal impedance and reduces the usability of lithium batteries

Method used

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  • Energy storage composite particle, battery negative electrode material and battery
  • Energy storage composite particle, battery negative electrode material and battery
  • Energy storage composite particle, battery negative electrode material and battery

Examples

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Comparison scheme
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example 1

[0076] [Example 1: Si / Carbon]

[0077] High-capacity nano-silicon and carbon materials are evenly dispersed by high-speed stirring. Next, spray granulation and mechanical devices are used to produce porous secondary particles. Next, pitch is used as the carbon precursor, so that the surface of the porous secondary particles is coated with a uniform layer of carbon precursor. Then, after high temperature (950°C) carbonization treatment, the carbon film is coated on the outside. Finally, energy storage composite particles with porosity, ie, Si / Carbon (Example 1 ), can be obtained.

example 2～6

[0078] [Examples 2-6: Si+Mg / Carbon, Si+Ca / Carbon, Si+Cu / Carbon, Si+Ag / Carbon, Si+Al / Carbon]

[0079] Using the high-speed stirring method, firstly disperse the high-capacity nano-silicon and carbon material evenly, and then slowly add the dissolved metal precursor. Among them, Example 2 is to add Mg(NO 3 ) 2 , Example 3 is to add Ca (NO 3 ) 2 , Example 4 is to add Cu(CH 3 COO) 2 , Example 5 is to add AgNO 3 , Example 6 is to add Al(NO 3 ) 3 .

[0080] Next, spray granulation and mechanical devices are used to generate porous secondary particles. Next, pitch is used as the carbon precursor, so that the surface of the porous secondary particles is coated with a uniform layer of carbon precursor. Then, after high temperature (800-1000°C) carbonization treatment, the carbon film is coated on the outside. Finally, porous energy storage composite particles can be obtained, that is, Si+Mg / Carbon (Example 2), Si+Ca / Carbon (Example 3), Si+Cu / Carbon (Example 4), Si+Ag / Carbon...

example 7

[0081] [Example 7: Si+SiC / Carbon]

[0082]With high-speed stirring, the high-capacity nano-silicon and carbon are dispersed evenly. Next, spray granulation and mechanical devices are used to generate porous secondary particles. Then, pitch is used as the carbon precursor, so that the surface of the porous secondary particles is coated with a uniform layer of carbon precursor. Then, it undergoes high-temperature (1100°C) carbonization treatment to coat the exterior with a carbon film. Finally, energy storage composite particles with pores, that is, Si+SiC / Carbon (Example 7) were obtained.

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Abstract

An energy storage composite particle is provided, which includes a carbon film, a conductive carbon component, an energy storage grain, and a conductive carbon fiber. The carbon film surrounds a space. The conductive carbon component and the energy storage grain are disposed in the space. The conductive carbon fiber is electrically connected to the conductive carbon component, the energy storage grain, and the carbon film, and the conductive carbon fiber extends from the inside of the space to the outside of the space. The energy storage composite particle has a high gravimetric capacity, a high coulomb efficiency, and a long cycle life. Furthermore, a battery negative electrode material and a battery using the energy storage composite particle are also provided.

Description

technical field [0001] The invention relates to an energy storage composite particle, and in particular to an energy storage composite particle with a novel structure, capable of storing high electric capacity and having good volume expansion / contraction characteristics. Background technique [0002] Lithium batteries have been widely used in notebook computers, mobile phones, digital cameras, video cameras, PDAs, Bluetooth headsets and wireless 3C products. [0003] The negative electrode material of existing commercialized lithium battery is mainly based on carbon powder material, for example: adopt mesocarbon microbeads (Mesocarbon Microbeads, MCMB) and artificial graphite, its gram electric capacity (capacity) is respectively MCMB (310mAh / g), artificial graphite (350mAh / g). However, the carbon-based negative electrode material has reached the bottleneck of the theoretical capacity of 372mAh / g, which cannot meet the needs of future high-power and high-energy-density lit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/583H01M4/133H01M10/0525
CPCY02E60/122H01M4/133H01M4/1393H01M4/364Y02E60/10
Inventor 陈金铭张彦博廖世杰郑季汝
Owner IND TECH RES INST