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Hydrogel-derived VPO4/porous carbon framework for enhanced lithium and sodium storage.
Nanoscale ( IF 5.8 ) Pub Date : 2020-01-29 , DOI: 10.1039/d0nr00460j
Donglei Guo 1 , Mengke Yang 1 , Yicong Li 1 , Yuwen Xue 1 , Guilong Liu 1 , Naiteng Wu 2 , Jang-Kyo Kim 3 , Xianming Liu 1
Nanoscale ( IF 5.8 ) Pub Date : 2020-01-29 , DOI: 10.1039/d0nr00460j
Donglei Guo 1 , Mengke Yang 1 , Yicong Li 1 , Yuwen Xue 1 , Guilong Liu 1 , Naiteng Wu 2 , Jang-Kyo Kim 3 , Xianming Liu 1
Affiliation
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Vanadium phosphate (VPO4) is attracting extensive attention because of its advantages of low cost, stable structure and high theoretical capacity. However, similar to other phosphates, VPO4 suffers from low electrical conductivity and large volume expansion, adversely influencing its electrochemical performance and thus limiting its application as an anode in lithium and sodium ion batteries. Herein, we propose a novel, facile strategy based on the organic-inorganic network of a nanostructured hybrid hydrogel for immobilizing VPO4 in a hierarchically porous carbon framework (3DHP-VPO4@C). VPO4 chemically interacts with the carbon framework via a P-C bond, functioning as a buffer layer to maintain structural stability during charge/discharge cycles. The carbon framework offers an efficient pathway for electron and Li+/Na+ transport to ensure high electronic conductivity of the electrode. The 3DHP-VPO4@C anode exhibits excellent lithium and sodium storage performances, and notably high capacities of 957 mA h g-1 at 0.1 A g-1 and 345.3 mA h g-1 at 5 A g-1 for lithium ion batteries. Full cells consisting of a LiFePO4 cathode and the 3DHP-VPO4@C anode also prove to have superior cycling stability and rate performance for LIBs.
中文翻译：
水凝胶衍生的VPO4 /多孔碳骨架可增强锂和钠的储存。
磷酸钒（VPO4）因其低成本，稳定的结构和较高的理论容量而备受关注。然而，类似于其他磷酸盐，VPO 4的电导率低且体积膨胀大，不利地影响其电化学性能，因此限制了其在锂和钠离子电池中作为阳极的应用。在此，我们提出了一种基于纳米结构杂化水凝胶的有机-无机网络的新颖，简便的策略，用于将VPO4固定在分层多孔碳骨架中（3DHP-VPO4 @ C）。VPO4通过PC键与碳骨架化学相互作用，充当缓冲层以在充电/放电循环中保持结构稳定性。碳骨架为电子和Li + / Na +的传输提供了有效的途径，以确保电极的高电导率。3DHP-VPO4 @ C阳极具有出色的锂和钠存储性能，尤其是锂离子电池，在0.1 A g-1时为957 mA h g-1，在5 A g-1时为345.3 mA h g-1。由LiFePO4阴极和3DHP-VPO4 @ C阳极组成的全电池也证明对LIB具有出色的循环稳定性和倍率性能。
更新日期：2020-02-14
中文翻译：
水凝胶衍生的VPO4 /多孔碳骨架可增强锂和钠的储存。
磷酸钒（VPO4）因其低成本，稳定的结构和较高的理论容量而备受关注。然而，类似于其他磷酸盐，VPO 4的电导率低且体积膨胀大，不利地影响其电化学性能，因此限制了其在锂和钠离子电池中作为阳极的应用。在此，我们提出了一种基于纳米结构杂化水凝胶的有机-无机网络的新颖，简便的策略，用于将VPO4固定在分层多孔碳骨架中（3DHP-VPO4 @ C）。VPO4通过PC键与碳骨架化学相互作用，充当缓冲层以在充电/放电循环中保持结构稳定性。碳骨架为电子和Li + / Na +的传输提供了有效的途径，以确保电极的高电导率。3DHP-VPO4 @ C阳极具有出色的锂和钠存储性能，尤其是锂离子电池，在0.1 A g-1时为957 mA h g-1，在5 A g-1时为345.3 mA h g-1。由LiFePO4阴极和3DHP-VPO4 @ C阳极组成的全电池也证明对LIB具有出色的循环稳定性和倍率性能。
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