A Ni/MH Pouch Cell with High-Capacity Ni(OH)2
Electrochemical performances of a high-capacity and long life β-α core-shell structured Ni0.84Co0.12Al0.04(OH)2 as the positive electrode active material were tested in a pouch design and compared to those of a standard β-Ni0.91Co0.045Zn0.045(OH)2. The core-shell materials were fabricated with a con...
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| Format: | Article |
| Language: | English |
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MDPI AG
2017-12-01
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| Series: | Batteries |
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| Online Access: | https://www.mdpi.com/2313-0105/3/4/38 |
| _version_ | 1811223611422277632 |
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| author | Shuli Yan Tiejun Meng Kwo-Hsiung Young Jean Nei |
| author_facet | Shuli Yan Tiejun Meng Kwo-Hsiung Young Jean Nei |
| author_sort | Shuli Yan |
| collection | DOAJ |
| description | Electrochemical performances of a high-capacity and long life β-α core-shell structured Ni0.84Co0.12Al0.04(OH)2 as the positive electrode active material were tested in a pouch design and compared to those of a standard β-Ni0.91Co0.045Zn0.045(OH)2. The core-shell materials were fabricated with a continuous co-precipitation process, which created an Al-poor core and an Al-rich shell during the nucleation and particle growth stages, respectively. The Al-rich shell became α-Ni(OH)2 after electrical activation and remained intact through the cycling. Pouch cells with the high-capacity β-α core-shell positive electrode material show higher charge acceptances and discharge capacities at 0.1C, 0.2C, 0.5C, and 1C, improved self-discharge performances, and reduced internal and surface charge-transfer resistances, at both room temperature and −10 °C when compared to those with the standard positive electrode material. While the high capacity of the core-shell material can be attributed to the α phase with a multi-electron transfer capability, the improvement in high-rate capability (lower resistance) is caused by the unique surface morphology and abundant interface sites at the β-α grain boundaries. Gravimetric energy densities of pouch cells made with the high-capacity and standard positive materials are 127 and 110 Wh·kg−1, respectively. A further improvement in capacity is expected via the continued optimization of pouch design and the use of high-capacity metal hydride alloy. |
| first_indexed | 2024-04-12T08:35:43Z |
| format | Article |
| id | doaj.art-eb69bd82b3114238a907f4e3bb7ec86e |
| institution | Directory Open Access Journal |
| issn | 2313-0105 |
| language | English |
| last_indexed | 2024-04-12T08:35:43Z |
| publishDate | 2017-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Batteries |
| spelling | doaj.art-eb69bd82b3114238a907f4e3bb7ec86e2022-12-22T03:40:01ZengMDPI AGBatteries2313-01052017-12-01343810.3390/batteries3040038batteries3040038A Ni/MH Pouch Cell with High-Capacity Ni(OH)2Shuli Yan0Tiejun Meng1Kwo-Hsiung Young2Jean Nei3BASF/Battery Materials—Ovonic, 2983 Waterview Drive, Rochester Hills, MI 48309, USABASF/Battery Materials—Ovonic, 2983 Waterview Drive, Rochester Hills, MI 48309, USABASF/Battery Materials—Ovonic, 2983 Waterview Drive, Rochester Hills, MI 48309, USABASF/Battery Materials—Ovonic, 2983 Waterview Drive, Rochester Hills, MI 48309, USAElectrochemical performances of a high-capacity and long life β-α core-shell structured Ni0.84Co0.12Al0.04(OH)2 as the positive electrode active material were tested in a pouch design and compared to those of a standard β-Ni0.91Co0.045Zn0.045(OH)2. The core-shell materials were fabricated with a continuous co-precipitation process, which created an Al-poor core and an Al-rich shell during the nucleation and particle growth stages, respectively. The Al-rich shell became α-Ni(OH)2 after electrical activation and remained intact through the cycling. Pouch cells with the high-capacity β-α core-shell positive electrode material show higher charge acceptances and discharge capacities at 0.1C, 0.2C, 0.5C, and 1C, improved self-discharge performances, and reduced internal and surface charge-transfer resistances, at both room temperature and −10 °C when compared to those with the standard positive electrode material. While the high capacity of the core-shell material can be attributed to the α phase with a multi-electron transfer capability, the improvement in high-rate capability (lower resistance) is caused by the unique surface morphology and abundant interface sites at the β-α grain boundaries. Gravimetric energy densities of pouch cells made with the high-capacity and standard positive materials are 127 and 110 Wh·kg−1, respectively. A further improvement in capacity is expected via the continued optimization of pouch design and the use of high-capacity metal hydride alloy.https://www.mdpi.com/2313-0105/3/4/38metal hydride alloynickel metal hydride batterypouch cellelectrochemistryalpha nickel hydroxidecore shell |
| spellingShingle | Shuli Yan Tiejun Meng Kwo-Hsiung Young Jean Nei A Ni/MH Pouch Cell with High-Capacity Ni(OH)2 Batteries metal hydride alloy nickel metal hydride battery pouch cell electrochemistry alpha nickel hydroxide core shell |
| title | A Ni/MH Pouch Cell with High-Capacity Ni(OH)2 |
| title_full | A Ni/MH Pouch Cell with High-Capacity Ni(OH)2 |
| title_fullStr | A Ni/MH Pouch Cell with High-Capacity Ni(OH)2 |
| title_full_unstemmed | A Ni/MH Pouch Cell with High-Capacity Ni(OH)2 |
| title_short | A Ni/MH Pouch Cell with High-Capacity Ni(OH)2 |
| title_sort | ni mh pouch cell with high capacity ni oh 2 |
| topic | metal hydride alloy nickel metal hydride battery pouch cell electrochemistry alpha nickel hydroxide core shell |
| url | https://www.mdpi.com/2313-0105/3/4/38 |
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