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Anodes for lithium-ion devices

A lithium ion and negative electrode technology, applied in the field of lithium ion devices, can solve the problems of mechanical instability, poor Coulombic efficiency, poor life cycle, etc.

Active Publication Date: 2017-04-26
STOREDOT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such silicon-containing electrodes usually exhibit poor life cycle and poor Coulombic efficiency due to the mechanical expansion of silicon when alloying with lithium and extracting lithium from the alloy, the reduced silicon alloy volume
This mechanical instability causes the material to break into pieces

Method used

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  • Anodes for lithium-ion devices
  • Anodes for lithium-ion devices
  • Anodes for lithium-ion devices

Examples

Experimental program
Comparison scheme
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preparation example Construction

[0026] Preparation of the negative electrode may include grinding and / or mixing processes. In some embodiments, silicon powder and graphite powder can be inserted into a high energy ball mill for milling under a protective atmosphere or a non-protective atmosphere. In some embodiments, boron carbide (B 4C) The powder is added to the pre-ground Si / C mixture inside the mill. The grinder can include hardened alumina media that can be agitated at 1000-1500 RPM. The milling stage can produce an alloy of nano-sized particles having a particle size of about 20-100 nm. In some embodiments, an emulsion containing nano-sized tungsten carbide (WC) particles can be added to the ground powder (Si / C or SI / C / B alloy) at the end of the milling process to produce the active material for the negative electrode. The tungsten carbide grain size may be about 20 to 60 nm. As used herein, "nano-sized" particles refer to particles having an average particle size of less than 1 micron, in embodime...

example

[0033] refer to figure 2 , which shows the first cycle charge-discharge curves of an exemplary Li-ion half-cell for a silicon-based negative electrode comprising boron according to some embodiments of the present invention. The voltage of the half cells is expressed as a function of the charge value in mAh / g. An exemplary negative electrode material includes (by weight percent of the total weight of the negative electrode) 48% C, 30% Si, 5.5% B, 8.3% binder, and 8.2% conductive additive (C 0.48 Si 0.30 B 0.055 Adhesive 0.083 conductive additive 0.082 ). The ground C / Si / B alloy (i.e. the active material) contained 57% by weight of C, 36% of Si and 7% of B (C 0.57 Si 0.36 B 0.07 ). Observed figure 2 The graph of , yielded 792 mAh / g on charge and 760 mAh / g on discharge, giving a first cycle efficiency of 96%. The first cycle efficiency is defined as the first discharge amount divided by the first charge amount. It should be noted that within the discharge curve ther...

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Abstract

An anode material for a lithium ion device includes an active material including silicon and boron. The weight percentage of the silicon is between about 4 to 35 weight % of the total weight of the anode material and the weight percentage of the boron is between about 2 to 20 weight % of the total weight of the anode material. The active material may include carbon at a weight percentage of between 5 to about 60 weight % of the total weight of the anode material. Additional materials, methods of making and devices are taught.

Description

technical field [0001] The present disclosure relates to electrode active materials for use in lithium-ion devices, such as rechargeable lithium-ion batteries. Background technique [0002] Lithium-ion batteries, also known as Li-ion batteries or LIBs, are widely used in consumer electronics such as mobile phones, tablet computers and notebook computers. LIBs are also used in other areas such as military use, electric vehicles and aerospace applications. During battery discharge, lithium ions (Li ions) travel from the high-energy negative electrode material through the electrolyte and separator to the low-energy positive electrode material. During charging, energy is used to transfer Li ions back to the high-energy anode assembly. The charging and discharging process of a battery is a slow process and can degrade the compounds within the battery over time. Rapid charging results in accelerated degradation of battery components, as well as a potential fire hazard due to lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/134H01M4/38H01M4/587H01M10/052H01G11/06H01G11/30H01G11/36H01G11/50H01G11/86H01G11/56H01M4/62
CPCH01G11/06H01G11/30H01G11/36H01G11/50H01G11/86H01M4/133H01M4/134H01M4/386H01M4/587H01M10/052H01G11/56H01M4/625H01M4/364H01M4/38H01M10/0525Y02T10/70Y02E60/10Y02E60/13
Inventor 多龙·伯什坦利龙·阿米尔丹尼尔·阿罗诺夫奥尔加·古乔克列昂尼德·克拉索维茨基
Owner STOREDOT