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Fundamental modeling the performance...

Fang, Weifang.

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Fundamental modeling the performance and degradation of HEV Lithium-ion battery.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Fundamental modeling the performance and degradation of HEV Lithium-ion battery./
作者:	Fang, Weifang.
面頁冊數:	164 p.
附註:	Source: Dissertation Abstracts International, Volume: 72-01, Section: B, page: 0480.
Contained By:	Dissertation Abstracts International72-01B.
標題:	Chemistry, Inorganic. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3436138
ISBN:	9781124352701

Fundamental modeling the performance and degradation of HEV Lithium-ion battery.
Fang, Weifang.

Fundamental modeling the performance and degradation of HEV Lithium-ion battery. - 164 p.

Source: Dissertation Abstracts International, Volume: 72-01, Section: B, page: 0480.

Thesis (Ph.D.)--The Pennsylvania State University, 2010.

Li-ion battery is now replacing nickel-metal hydride (NiMH) for hybrid electric vehicles (HEV). The advantages of Li-ion battery over NiMH are that it can provide longer life, higher cell voltage and higher energy density, etc. However, there are still some issues unsolved for Li-ion battery to fully satisfy the HEV requirement. At high temperature, thermal runaway may cause safety issues. At low temperature, however, its performance is dramatically reduced and also Li deposition may occur. Furthermore, degradation due to side reactions in the electrodes during cycling and storage results in capacity loss and impedance rise.

ISBN: 9781124352701Subjects--Topical Terms:

517253
Chemistry, Inorganic.

Fundamental modeling the performance and degradation of HEV Lithium-ion battery.
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245 1 0 $a Fundamental modeling the performance and degradation of HEV Lithium-ion battery.
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500 $a Adviser: Chao-Yang Wang.
502 $a Thesis (Ph.D.)--The Pennsylvania State University, 2010.
520 $a Li-ion battery is now replacing nickel-metal hydride (NiMH) for hybrid electric vehicles (HEV). The advantages of Li-ion battery over NiMH are that it can provide longer life, higher cell voltage and higher energy density, etc. However, there are still some issues unsolved for Li-ion battery to fully satisfy the HEV requirement. At high temperature, thermal runaway may cause safety issues. At low temperature, however, its performance is dramatically reduced and also Li deposition may occur. Furthermore, degradation due to side reactions in the electrodes during cycling and storage results in capacity loss and impedance rise.
520 $a An electrochemical-thermal coupled model is first used to predict performance of individual electrodes of Li-ion cells under HEV conditions that encompass a wide range of ambient temperatures. The model is validated against experimental data of not only the full cell but also individual electrodes and then used to study lithium deposition on the negative electrode during charging Li-ion battery at subzero temperature. The simulated property evolution, e.g. Li concentrations in electrode and electrolyte, shows that either low temperature or high charge rate may force Li insertion (into the negative carbon electrode) to occur in a narrow region near the separator. Therefore, Li deposition is mostly like to happen in this location. Modeling simulation shows that reduction of the negative electrode particle size can reduce Li deposition, which has same effect as improvement of the Li diffusion coefficient in the negative electrode. The model is also used to study charge protocols at subzero temperature. Model simulation shows that employing pulse current can improve cell temperature by the heat generated inside the cell, thus this designed charge protocol is able to reduce Li deposition and improve the charge efficiency as well.
520 $a Individual aging mechanism is then implemented into each electrode to study Li-ion battery degradation during accelerated aging tests. The experimentally observed aging phenomena are interpreted using the degradation model. The simulated results show that the positive electrode active material loss is the main cause of capacity loss and impedance growth. And this is the key step for a model to well catch the experimentally observed aging phenomena in the two electrodes.
520 $a In the future work, the degradation model will further help to prolong battery life through engineering and optimization in HEV applications.
590 $a School code: 0176.
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