fast lithium growth and short circuit induced by localized-temperature hotspots in lithium batteries - best lithium battery
Fast-
Charging and highenergy-
Due to the high heating rate, the density battery has brought a major safety problem.
It is critical to understand how local high temperatures affect the battery, but still challenging, mainly due to the difficulty of detecting the internal temperature of the battery at high spatial resolution.
Here we present a method for inducing and sensing local high temperatures inside lithium batteries using micro-sensors
Raman spectrum
We found that, compared to the surrounding lower temperature region, temperature hotspots may lead to a significant increase in lithium metals due to locally enhanced surface exchange current density.
More importantly, local high temperature may be one of the factors that lead to a short circuit inside the battery, which further increases the temperature and increases the risk of heat out of control.
This work provides important insights into the heterogeneous temperature effects inside the battery and helps develop safer battery, thermal management solutions, and diagnostic tools.
Battery energy storage is essential for renewable energy technologies and environmental sustainability.
Significant progress has been made in developing rechargeable Lithium
Batteries in recent decades.
However, with the increase of charging rate and energy density
Heating becomes Non
The effect can be ignored
Although the effect of uniform temperature on lithium growth morphology, cycling capacity and aging rate has been previously studied, the battery in reality is usually non-
Uniform temperature, sometimes local temperature
A temperature hotspot from an internal or external heat source, or a temperature hotspot from manufacturing non-uniformity and defects.
It is not clear how the local high temperature affects the operation of the battery.
In the challenge of local learning
Temperature effect is a difficult point to detect the internal temperature of the battery at high spatial resolution.
Temperature measurement techniques used in batteries are usually remote (e. g.
, Sensors on the external packaging of the battery)
Or macro (e. g.
, Thermocouple and infrared imaging).
However, the small length scale of the battery electrode material and its electro-chemical process require temperature sensing at a more microscopic level.
In particular, in the case of heat out of control, this can lead to catastrophic fire or explosion, usually caused by a short circuit inside the battery, thus capturing the local
The temperature response provides valuable information, which is helpful for the basic understanding of the failure mechanism and the formulation of the thermal management strategy. Lithium (Li)
Recently, an in-depth study of metals as attractive anode with the highest specific capacity has been conducted, and understanding all factors affecting their growth is critical to the safety of lithium metal batteries and existing lithiumion batteries.
In this work, we investigated the local impact.
Temperature hot spots of metal growth, and based on this, the temperature-
When considering battery safety, the mechanism of induction battery short circuit may be a problem.
The local high temperature is generated by laser inside the lithium battery, and the micro-
Raman spectrum platform.
Due to the enhanced surface exchange current density, the Li deposition rate was found to be several orders of magnitude faster in hot spots.
Based on this observation, we further demonstrate that local high temperature may be one of the factors that lead to a short circuit of the battery, which gives optical visualization and simultaneous voltage-
Measurement of current and local temperature response.
The temperature measurement platform opens a new door for detailed thermal properties testing of energy storage devices.