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Chung-cheng Chiang - One of the best experts on this subject based on the ideXlab platform.

  • thermal runaway features of 18650 lithium ion batteries for lifepo4 Cathode Material by dsc and vsp2
    Journal of Thermal Analysis and Calorimetry, 2012
    Co-Authors: Yih-wen Wang, Chung-cheng Chiang
    Abstract:

    Abstract In view of availability, accountability, and applicability, LiFePO4 Cathode Material has been confirmed to be better than LiCoO2 Cathode Material. Nevertheless, few related researches were conducted for thermal runaway reaction of the LiFePO4 batteries. In this study, vent sizing package 2 (VSP2) and differential scanning calorimetry were employed to observe the thermal hazard of 18650 lithium-ion batteries and their content—LiFePO4 Cathode Material, which were manufactured by Commercial Battery, Inc. Two states of the batteries were investigated, which was charged to 3.6 V (fully charged) and 4.2 V (overcharged), respectively, and important parameters were obtained, such as self-heating rate (dT dt−1), pressure-rise rate (dP dt−1), and exothermic onset temperature (T0). The results showed that T0 for fully charged is about 199.94 °C and Tmax is about 243.23 °C. The entire battery for LiFePO4 Cathode Material is more stable than other lithium-ion batteries, and an entire battery is more dangerous...

  • Thermal runaway features of 18650 lithium-ion batteries for LiFePO4 Cathode Material by DSC and VSP2
    Journal of Thermal Analysis and Calorimetry, 2012
    Co-Authors: Yih-wen Wang, Chung-cheng Chiang
    Abstract:

    In view of availability, accountability, and applicability, LiFePO4 Cathode Material has been confirmed to be better than LiCoO2 Cathode Material. Nevertheless, few related researches were conducted for thermal runaway reaction of the LiFePO4 batteries. In this study, vent sizing package 2 (VSP2) and differential scanning calorimetry were employed to observe the thermal hazard of 18650 lithium-ion batteries and their content—LiFePO4 Cathode Material, which were manufactured by Commercial Battery, Inc. Two states of the batteries were investigated, which was charged to 3.6 V (fully charged) and 4.2 V (overcharged), respectively, and important parameters were obtained, such as self-heating rate (dT dt −1), pressure-rise rate (dP dt −1), and exothermic onset temperature (T 0). The results showed that T 0 for fully charged is about 199.94 °C and T max is about 243.23 °C. The entire battery for LiFePO4 Cathode Material is more stable than other lithium-ion batteries, and an entire battery is more dangerous than a single Cathode Material. For process loss prevention, the data of battery of VSP2 test were applied as reference for design of safer devices.

Yang-kook Sun - One of the best experts on this subject based on the ideXlab platform.

  • Cathode Material with nanorod structure an application for advanced high energy and safe lithium batteries
    Chemistry of Materials, 2013
    Co-Authors: Hyung Joo Noh, Khalil Amine, Zonghai Chen, Chong Seung Yoon, Jun Lu, Yang-kook Sun
    Abstract:

    We have developed a novel Cathode Material based on lithium–nickel–manganese–cobalt oxide, where the manganese concentration remains constant throughout the particle, while the nickel concentration decreases linearly and the cobalt concentration increases from the center to the outer surface of the particle. This full concentration gradient Material with a fixed manganese composition (FCG–Mn-F) has an average composition of Li[Ni0.60Co0.15Mn0.25]O2 and is composed of rod-shaped primary particles whose length reaches 2.5 μm, growing in the radial direction. In cell tests, the FCG–Mn-F Material delivered a high capacity of 206 mAh g–1 with excellent capacity retention of 70.3% after 1000 cycles at 55 °C. This Cathode Material also exhibited outstanding rate capability, good low-temperature performance, and excellent safety, compared to a conventional Cathode having the same composition (Li[Ni0.60Co0.15Mn0.25]O2), where the concentration of the metals is constant across the particles.

  • Cathode Material with Nanorod Structure—An Application for Advanced High-Energy and Safe Lithium Batteries
    Chemistry of Materials, 2013
    Co-Authors: Hyung Joo Noh, Zonghai Chen, Khalil Amine, Chong Seung Yoon, Yang-kook Sun
    Abstract:

    We have developed a novel Cathode Material based on lithium–nickel–manganese–cobalt oxide, where the manganese concentration remains constant throughout the particle, while the nickel concentration decreases linearly and the cobalt concentration increases from the center to the outer surface of the particle. This full concentration gradient Material with a fixed manganese composition (FCG–Mn-F) has an average composition of Li[Ni0.60Co0.15Mn0.25]O2 and is composed of rod-shaped primary particles whose length reaches 2.5 μm, growing in the radial direction. In cell tests, the FCG–Mn-F Material delivered a high capacity of 206 mAh g–1 with excellent capacity retention of 70.3% after 1000 cycles at 55 °C. This Cathode Material also exhibited outstanding rate capability, good low-temperature performance, and excellent safety, compared to a conventional Cathode having the same composition (Li[Ni0.60Co0.15Mn0.25]O2), where the concentration of the metals is constant across the particles.

  • High-energy Cathode Material for long-life and safe lithium batteries
    Nature Materials, 2009
    Co-Authors: Yang-kook Sun, Byung Chun Park, Seung-taek Myung, Ilias Belharouak, Jai Prakash, Khalil Amine
    Abstract:

    Layered lithium nickel-rich oxides, Li[Ni(1-x)M(x)]O(2) (M=metal), have attracted significant interest as the Cathode Material for rechargeable lithium batteries owing to their high capacity, excellent rate capability and low cost. However, their low thermal-abuse tolerance and poor cycle life, especially at elevated temperature, prohibit their use in practical batteries. Here, we report on a concentration-gradient Cathode Material for rechargeable lithium batteries based on a layered lithium nickel cobalt manganese oxide. In this Material, each particle has a central bulk that is rich in Ni and a Mn-rich outer layer with decreasing Ni concentration and increasing Mn and Co concentrations as the surface is approached. The former provides high capacity, whereas the latter improves the thermal stability. A half cell using our concentration-gradient Cathode Material achieved a high capacity of 209 mA h g(-1) and retained 96% of this capacity after 50 charge-discharge cycles under an aggressive test profile (55 degrees C between 3.0 and 4.4 V). Our concentration-gradient Material also showed superior performance in thermal-abuse tests compared with the bulk composition Li[Ni(0.8)Co(0.1)Mn(0.1)]O(2) used as reference. These results suggest that our Cathode Material could enable production of batteries that meet the demanding performance and safety requirements of plug-in hybrid electric vehicles.

Yih-wen Wang - One of the best experts on this subject based on the ideXlab platform.

  • thermal runaway features of 18650 lithium ion batteries for lifepo4 Cathode Material by dsc and vsp2
    Journal of Thermal Analysis and Calorimetry, 2012
    Co-Authors: Yih-wen Wang, Chung-cheng Chiang
    Abstract:

    Abstract In view of availability, accountability, and applicability, LiFePO4 Cathode Material has been confirmed to be better than LiCoO2 Cathode Material. Nevertheless, few related researches were conducted for thermal runaway reaction of the LiFePO4 batteries. In this study, vent sizing package 2 (VSP2) and differential scanning calorimetry were employed to observe the thermal hazard of 18650 lithium-ion batteries and their content—LiFePO4 Cathode Material, which were manufactured by Commercial Battery, Inc. Two states of the batteries were investigated, which was charged to 3.6 V (fully charged) and 4.2 V (overcharged), respectively, and important parameters were obtained, such as self-heating rate (dT dt−1), pressure-rise rate (dP dt−1), and exothermic onset temperature (T0). The results showed that T0 for fully charged is about 199.94 °C and Tmax is about 243.23 °C. The entire battery for LiFePO4 Cathode Material is more stable than other lithium-ion batteries, and an entire battery is more dangerous...

  • Thermal runaway features of 18650 lithium-ion batteries for LiFePO4 Cathode Material by DSC and VSP2
    Journal of Thermal Analysis and Calorimetry, 2012
    Co-Authors: Yih-wen Wang, Chung-cheng Chiang
    Abstract:

    In view of availability, accountability, and applicability, LiFePO4 Cathode Material has been confirmed to be better than LiCoO2 Cathode Material. Nevertheless, few related researches were conducted for thermal runaway reaction of the LiFePO4 batteries. In this study, vent sizing package 2 (VSP2) and differential scanning calorimetry were employed to observe the thermal hazard of 18650 lithium-ion batteries and their content—LiFePO4 Cathode Material, which were manufactured by Commercial Battery, Inc. Two states of the batteries were investigated, which was charged to 3.6 V (fully charged) and 4.2 V (overcharged), respectively, and important parameters were obtained, such as self-heating rate (dT dt −1), pressure-rise rate (dP dt −1), and exothermic onset temperature (T 0). The results showed that T 0 for fully charged is about 199.94 °C and T max is about 243.23 °C. The entire battery for LiFePO4 Cathode Material is more stable than other lithium-ion batteries, and an entire battery is more dangerous than a single Cathode Material. For process loss prevention, the data of battery of VSP2 test were applied as reference for design of safer devices.

Thierry Djenizian - One of the best experts on this subject based on the ideXlab platform.

Khalil Amine - One of the best experts on this subject based on the ideXlab platform.

  • Cathode Material with nanorod structure an application for advanced high energy and safe lithium batteries
    Chemistry of Materials, 2013
    Co-Authors: Hyung Joo Noh, Khalil Amine, Zonghai Chen, Chong Seung Yoon, Jun Lu, Yang-kook Sun
    Abstract:

    We have developed a novel Cathode Material based on lithium–nickel–manganese–cobalt oxide, where the manganese concentration remains constant throughout the particle, while the nickel concentration decreases linearly and the cobalt concentration increases from the center to the outer surface of the particle. This full concentration gradient Material with a fixed manganese composition (FCG–Mn-F) has an average composition of Li[Ni0.60Co0.15Mn0.25]O2 and is composed of rod-shaped primary particles whose length reaches 2.5 μm, growing in the radial direction. In cell tests, the FCG–Mn-F Material delivered a high capacity of 206 mAh g–1 with excellent capacity retention of 70.3% after 1000 cycles at 55 °C. This Cathode Material also exhibited outstanding rate capability, good low-temperature performance, and excellent safety, compared to a conventional Cathode having the same composition (Li[Ni0.60Co0.15Mn0.25]O2), where the concentration of the metals is constant across the particles.

  • Cathode Material with Nanorod Structure—An Application for Advanced High-Energy and Safe Lithium Batteries
    Chemistry of Materials, 2013
    Co-Authors: Hyung Joo Noh, Zonghai Chen, Khalil Amine, Chong Seung Yoon, Yang-kook Sun
    Abstract:

    We have developed a novel Cathode Material based on lithium–nickel–manganese–cobalt oxide, where the manganese concentration remains constant throughout the particle, while the nickel concentration decreases linearly and the cobalt concentration increases from the center to the outer surface of the particle. This full concentration gradient Material with a fixed manganese composition (FCG–Mn-F) has an average composition of Li[Ni0.60Co0.15Mn0.25]O2 and is composed of rod-shaped primary particles whose length reaches 2.5 μm, growing in the radial direction. In cell tests, the FCG–Mn-F Material delivered a high capacity of 206 mAh g–1 with excellent capacity retention of 70.3% after 1000 cycles at 55 °C. This Cathode Material also exhibited outstanding rate capability, good low-temperature performance, and excellent safety, compared to a conventional Cathode having the same composition (Li[Ni0.60Co0.15Mn0.25]O2), where the concentration of the metals is constant across the particles.

  • High-energy Cathode Material for long-life and safe lithium batteries
    Nature Materials, 2009
    Co-Authors: Yang-kook Sun, Byung Chun Park, Seung-taek Myung, Ilias Belharouak, Jai Prakash, Khalil Amine
    Abstract:

    Layered lithium nickel-rich oxides, Li[Ni(1-x)M(x)]O(2) (M=metal), have attracted significant interest as the Cathode Material for rechargeable lithium batteries owing to their high capacity, excellent rate capability and low cost. However, their low thermal-abuse tolerance and poor cycle life, especially at elevated temperature, prohibit their use in practical batteries. Here, we report on a concentration-gradient Cathode Material for rechargeable lithium batteries based on a layered lithium nickel cobalt manganese oxide. In this Material, each particle has a central bulk that is rich in Ni and a Mn-rich outer layer with decreasing Ni concentration and increasing Mn and Co concentrations as the surface is approached. The former provides high capacity, whereas the latter improves the thermal stability. A half cell using our concentration-gradient Cathode Material achieved a high capacity of 209 mA h g(-1) and retained 96% of this capacity after 50 charge-discharge cycles under an aggressive test profile (55 degrees C between 3.0 and 4.4 V). Our concentration-gradient Material also showed superior performance in thermal-abuse tests compared with the bulk composition Li[Ni(0.8)Co(0.1)Mn(0.1)]O(2) used as reference. These results suggest that our Cathode Material could enable production of batteries that meet the demanding performance and safety requirements of plug-in hybrid electric vehicles.