國立虎尾科技大學 |

鋰電池石墨負極材料表面包覆與離子摻雜改質之電化學研究 = = Electrochemical Study on Surface Coating and Ion Doping Modification of Graphite Anode Materials for Lithium Batteries /

Record Type:	Language materials, printed : Monograph/item
Title/Author:	鋰電池石墨負極材料表面包覆與離子摻雜改質之電化學研究 =/ 張君鼎.
Reminder of title:	Electrochemical Study on Surface Coating and Ion Doping Modification of Graphite Anode Materials for Lithium Batteries /
remainder title:	Electrochemical Study on Surface Coating and Ion Doping Modification of Graphite Anode Materials for Lithium Batteries.
Author:	張君鼎
Published:	雲林縣 :國立虎尾科技大學 , : 民113.07.,
Description:	[12], 80面 :圖, 表 ; : 30公分.;
Notes:	指導教授: 林秀芬.
Subject:	electrochemical performance. -
Online resource:	電子資源

鋰電池石墨負極材料表面包覆與離子摻雜改質之電化學研究 = = Electrochemical Study on Surface Coating and Ion Doping Modification of Graphite Anode Materials for Lithium Batteries /
張君鼎

鋰電池石墨負極材料表面包覆與離子摻雜改質之電化學研究 =Electrochemical Study on Surface Coating and Ion Doping Modification of Graphite Anode Materials for Lithium Batteries /Electrochemical Study on Surface Coating and Ion Doping Modification of Graphite Anode Materials for Lithium Batteries.張君鼎. - 初版. - 雲林縣 :國立虎尾科技大學 ,民113.07. - [12], 80面 :圖, 表 ;30公分.

指導教授: 林秀芬.

碩士論文--國立虎尾科技大學材料科學與工程系材料科學與綠色能源工程碩士班.

含參考書目.

由於鋰離子電池具有高能量密度、無記憶效應、低自放電率和高循環壽命等優點，近些年來備受關注。隨著科技的發展，人們對鋰電池的要求越來越高，例如手機的使用時間和壽命，以及電動車的續航里程等。這使得大眾對電池的電容量及安全性的要求越來越高，因此迫切需要研究出高電容量和高安全性的電池材料。石墨材料由於具有低脫鋰電位、長循環壽命和資源豐富等優點，最早被投入商業化電池中。然而，碳材料負極的比容量及首次充放電效率較低，這促使科學家積極開發非碳材料或改質石墨材料。此外，石墨負極材料在充放電過程中，有機電解液會共嵌入石墨層，導致石墨層的剝落，進而影響電池的壽命。為了改善石墨碳材料的缺點，本篇論文使用噴霧造粒、固態燒結法以及化學共沉澱法對人造石墨MAGE3進行表面包覆改質與陰離子摻雜。改質材料分別為Li4Ti5O12、TiO2、F、CuS，期望透過表面包覆及陰離子摻雜以此增加石墨負極的電容量及循環壽命，此外在LiNi0.5Mn1.5O4與石墨負極材料的全電池測試中，循環的充放電過程會使LiNi0.5Mn1.5O4析出Mn2+，並在負極表面沉積，因此增加鋰離子的擴散難度，因此本次實驗希望透過表面改質來改善Mn2+在負極表面沉積的副反應。從實驗結果可知，MAGE3-Bare在2C下的電容量為149mAh/g，MA-LT-1S、MA-T-1S、MA-F-1S與MA-CuS-1S在2C下的電容量分別為217、295、196與231 mAh/g，可知石墨經過TiO2表面包覆後可提升最多電容量。在0.2C/0.5C的充放電循環中，未改質的MAGE-Bare在100圈循環後電容量與電容量保持率分別為285 mAh/g與81%；MA-LT-1S為358 mAh/g與100%；MA-T-1S為360mAh/g與100%；MA-F-1S為355mAh/g與100%；MA-CuS-1S為328mAh/g與100%，可以發現經過改質之樣品在電容量保持率上均可提升，又以MA-T-1S在100圈時表現出最高的電容量，這一結果說明TiO2包覆MAGE可以有效的提升倍率性能及循環性能。分別將MAGE-Bare、MA-T-1S和MA-F-1S與TiO2@LiNi0.5Mn1.5O4搭配組成全電池，MAGE/LNMO經過50圈的充放電循環後電容量保持率為54.36%；MA-T/LNMO為62.66%；MA-F/LNMO為47.61%。可知經TiO2包覆可以增加LNMO全電池的循環，其原因是由於TiO2層可有效的隔絕負極表面與電解液直接接觸，減少了有機電解液對石墨層的傷害，XPS結果可發現透過包覆TiO2層也可以有效的抑制Mn2+在負極表面沉積的副反應。總合以上測試結果可知，在石墨負極材料表面包覆TiO2可以有效的增加電池倍率性能以及循環性能，同時在與LiNi0.5Mn1.5O4全電池中可以有效的抑制Mn2+在負極表面沉積的副反應。.

(平裝)Subjects--Topical Terms:

1450218
electrochemical performance.

鋰電池石墨負極材料表面包覆與離子摻雜改質之電化學研究 = = Electrochemical Study on Surface Coating and Ion Doping Modification of Graphite Anode Materials for Lithium Batteries /
LDR:06976cam a2200241 i 4500 001 1129829
008 241015s2024 ch ak erm 000 0 chi d
035 $a (THES)112NYPI0159018
040 $a NFU $b chi $c NFU $e CCR
041 0 # $a chi $b chi $b eng
084 $a 008.152M $b 1112 113 $2 ncsclt
100 1 $a 張君鼎 $3 1448878
245 1 0 $a 鋰電池石墨負極材料表面包覆與離子摻雜改質之電化學研究 = $b Electrochemical Study on Surface Coating and Ion Doping Modification of Graphite Anode Materials for Lithium Batteries / $c 張君鼎.
246 1 1 $a Electrochemical Study on Surface Coating and Ion Doping Modification of Graphite Anode Materials for Lithium Batteries.
250 $a 初版.
260 # $a 雲林縣 : $b 國立虎尾科技大學 , $c 民113.07.
300 $a [12], 80面 : $b 圖, 表 ; $c 30公分.
500 $a 指導教授: 林秀芬.
500 $a 學年度: 112.
502 $a 碩士論文--國立虎尾科技大學材料科學與工程系材料科學與綠色能源工程碩士班.
504 $a 含參考書目.
520 3 $a 由於鋰離子電池具有高能量密度、無記憶效應、低自放電率和高循環壽命等優點，近些年來備受關注。隨著科技的發展，人們對鋰電池的要求越來越高，例如手機的使用時間和壽命，以及電動車的續航里程等。這使得大眾對電池的電容量及安全性的要求越來越高，因此迫切需要研究出高電容量和高安全性的電池材料。石墨材料由於具有低脫鋰電位、長循環壽命和資源豐富等優點，最早被投入商業化電池中。然而，碳材料負極的比容量及首次充放電效率較低，這促使科學家積極開發非碳材料或改質石墨材料。此外，石墨負極材料在充放電過程中，有機電解液會共嵌入石墨層，導致石墨層的剝落，進而影響電池的壽命。為了改善石墨碳材料的缺點，本篇論文使用噴霧造粒、固態燒結法以及化學共沉澱法對人造石墨MAGE3進行表面包覆改質與陰離子摻雜。改質材料分別為Li4Ti5O12、TiO2、F、CuS，期望透過表面包覆及陰離子摻雜以此增加石墨負極的電容量及循環壽命，此外在LiNi0.5Mn1.5O4與石墨負極材料的全電池測試中，循環的充放電過程會使LiNi0.5Mn1.5O4析出Mn2+，並在負極表面沉積，因此增加鋰離子的擴散難度，因此本次實驗希望透過表面改質來改善Mn2+在負極表面沉積的副反應。從實驗結果可知，MAGE3-Bare在2C下的電容量為149mAh/g，MA-LT-1S、MA-T-1S、MA-F-1S與MA-CuS-1S在2C下的電容量分別為217、295、196與231 mAh/g，可知石墨經過TiO2表面包覆後可提升最多電容量。在0.2C/0.5C的充放電循環中，未改質的MAGE-Bare在100圈循環後電容量與電容量保持率分別為285 mAh/g與81%；MA-LT-1S為358 mAh/g與100%；MA-T-1S為360mAh/g與100%；MA-F-1S為355mAh/g與100%；MA-CuS-1S為328mAh/g與100%，可以發現經過改質之樣品在電容量保持率上均可提升，又以MA-T-1S在100圈時表現出最高的電容量，這一結果說明TiO2包覆MAGE可以有效的提升倍率性能及循環性能。分別將MAGE-Bare、MA-T-1S和MA-F-1S與TiO2@LiNi0.5Mn1.5O4搭配組成全電池，MAGE/LNMO經過50圈的充放電循環後電容量保持率為54.36%；MA-T/LNMO為62.66%；MA-F/LNMO為47.61%。可知經TiO2包覆可以增加LNMO全電池的循環，其原因是由於TiO2層可有效的隔絕負極表面與電解液直接接觸，減少了有機電解液對石墨層的傷害，XPS結果可發現透過包覆TiO2層也可以有效的抑制Mn2+在負極表面沉積的副反應。總合以上測試結果可知，在石墨負極材料表面包覆TiO2可以有效的增加電池倍率性能以及循環性能，同時在與LiNi0.5Mn1.5O4全電池中可以有效的抑制Mn2+在負極表面沉積的副反應。.
520 3 $a Lithium-ion batteries have attracted considerable attention in recent years because of the advantages they provide, such as high energy density, absence of the memory effect, low self-discharging rate, and high cycle life. As technologies evolve, lithium batteries are expected to fulfill greater requirements, such as increased use time and life for mobile phones and higher driving distance for electric vehicles. This demands more stringent requirements with regard to battery capacity and safety. Therefore, there is an urgent need to develop high-capacity and high-safety battery materials. Graphite materials were first used to manufacture commercial batteries due to their advantages of low delithium potential, long cycle life, and abundant resources. However, both the specific capacity of the anode of the carbon material and the first-time charging and discharging efficiency were low, which prompted researchers to actively develop non-carbon or modified graphite materials. Further, during the charging and discharging process for the graphite anode material, it was possible for the organic electrolyte to co-embed into the graphite layer, resulting in the spalling of the graphite layer, which affected battery life. To address the shortcomings of the graphitic carbon materials, in this study, spray granulation, solid-state sintering, and chemical coprecipitation were used to improve the surface coating and anion doping for the artificial graphite MAGE3. The modified materials included Li4Ti5O12, TiO2, F, and CuS. This is expected to increase the capacitance and cycle life of the graphite anode through surface coating and anion doping. Moreover, the cyclic charging and discharging process may cause LiNi0.5Mn1.5O4 to precipitate Mn2+ and deposit on the anode surface during the full-battery test of the LiNi0.5Mn1.5O4 and graphite anode materials. This phenomenon renders lithium ion diffusion more difficult. Therefore, it is expected to improve the side reaction of Mn2+ deposition on the anode surface through surface modification in this experimental study. Our experimental result demonstrated that the capacitances of MAGE3-Bare, MA-LT-1S, MA-T-1S, MA-F-1S, and MA-CuS-1S under 2C were 149, 217, 295, 196, and 231 mAh/g, respectively. Therefore, the electrical capacity can be increased to the maximum extent by using the TiO2 coating on the graphite surface. In the charging and discharging cycles of 0.2C and 0.5C, the electrical capacity of the unmodified MAGE-Bare after 100 cycles was 285 mAh/g, while its capacity retention rate was 81%. These two parameters were 358 mAh/g and 100% for MA-LT-1S, 360 mAh/g and 100% for MA-T-1S, 355 mAh/g and 100% for MA-F-1S, and 328 mAh/g and 100% for MA-CuS-1S. It was found that all the modified samples could improve the capacitance retention rate and that MA-T-1S exhibited the highest capacitance after 100 cycles. Therefore, it can be concluded that the TiO2 coating for MAGE can effectively improve the magnification performance and cycle performance of the battery..
563 $a (平裝)
650 # 4 $a electrochemical performance. $3 1450218
650 # 4 $a doping. $3 1423253
650 # 4 $a surface coating. $3 1420558
650 # 4 $a Graphite anode material. $3 1450217
650 # 4 $a Lithium-ion battery. $3 1127708
650 # 4 $a 電化學性能. $3 1420563
650 # 4 $a 陰離子摻雜. $3 1450216
650 # 4 $a 表面包覆. $3 1364244
650 # 4 $a 石墨負極材料. $3 1450215
650 # 4 $a 鋰離子電池. $3 1011591
856 7 # $u https://handle.ncl.edu.tw/11296/sj6dhx $z 電子資源 $2 http