JOURNAL OF POWER SOURCES
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2022
·
IF 9.794
Chunhui Wang,Shuangshuang Zhao,Wei Shen,Xiaoming Xi,Lishan Yang,Lixiong Bai,Yahui Yang,Chenghuan Huang,Jian Zhu,Youyuan Zhou,Yitai Qian,Zhongliang Tian,Yanqing Lai,Liqiang Xu
Layered high-temperature LiCoO 2 (HT-LiCoO 2 ), a mature commercial cathode for 3C electronic devices, has been unable to satisfy the new and ever-growing battery demands due to its high price and the structural instability at high temperature or high voltage conditions. The practical strategies mainly conclude introducing even dopants and functional modifications to LiCoO 2 crystals, but lacking explorations on the precise-control of non-equilibrium intermediates and preferred crystal planes during the solid-solid-gas (SSG) synthesis process. Here, the structure-optimal HT-LiCoO 2 micro-bricks are synthesized via coherent pyrolysis followed by a SSG reaction from Co–Al-mixed oxalate precursors, forming layered phase, ideal crystal morphology and uniformly distributed Al-dopants. In particular, we observe both of the phase progression and morphology evolution during the synthesis process of LiCo 1-x Al x O 2 micro-bricks. Integrating the superiorities of the nanosized intermediates and Al-doping regulation, smaller crystalline size and less salt-rock defects are realized in the target cathodes, ultimately achieving promoted Li + diffusion kinetic and electrochemical stability. Combined with the theory calculation, the optimized LiCo 1-x Al x O 2 with possible ion channels and the dopant-affected band gap have been simulated. These insights can help to guide the SSG synthesis of layered cathode materials with preferential orientations, precise doping and tailored phase compositions .
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Energy Technology
·
2017
·Vol. 5
·期 10
·1836-1843
·
IF 2.789
Haoxin Wang,Ze Yu,Xiao Jiang,Jiajia Li,Bin Cai,Xichuan Yang,Licheng Sun
The inorganic p-type semiconductor CuI possesses several unique characteristics such as high transparency, low-production cost, high hole mobility, and good chemical stability and is a promising hole-transporting material candidate that can be explored in solar-cell devices. Herein, we adopt a simple solid–gas reaction method to fabricate a uniform CuI film by exposing a thermally evaporated copper film to iodine vapor and apply it as a hole-transporting layer (HTL) in inverted planar perovskite solar cells (PSCs). The optimized devices display a promising power conversion (PCE) efficiency of 14.7 %, with an open-circuit voltage of 1.04 V, a short-circuit current density of 20.9 mW cm −2 , and a fill factor of 0.68. This is one of the highest PCE values reported so far for CuI-based HTL in PSCs. Moreover, the devices studied also exhibit good long-term stability at ambient atmosphere, arising from the hydrophobicity of CuI HTL. The results highlight that CuI fabricated using the simple and low-temperature processing method presented here holds great promise as low-cost alternative HTL material for the development of efficient and stable inverted planar PSCs in the future.
研究领域:
材料科学
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能源技术
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光伏器件
✓ 已验证
产品关联
DOI
高影响因子
OPTIK
·
2024
·
IF 3.1
Song-Hyok Kim,Kyong-Su Sonu,Pyol Kim,Jin-Hyok Ri,Kwon-Il Ryu,Chol-Il So,Sol-Gwang An,Il-Bok Choe
Recently, hole-conductor-free perovskite solar cells (PSCs) with carbon counter electrode (CCE) have attracted great attention for its high stability and low fabrication cost. Furthermore, it would lower the cost and simplify the manufacturing process of PSCs by low temperature processing instead of high temperature sintering for fabrication. In this case, however, it is very important to improve the interfacial contact between perovskite layer and CCE. In this work, we for the first time introduce solid-gas reaction between dimethylammonium lead iodide (DMAPbI 3 ) in solid state under carbon layer and methylamine (MA) gas passed through CCE which is formed at low temperature of 120 ℃. Based on Brunauer-Emmett-Teller (BET) measurement and XRD analysis , it is found that MA gas can pass through our low-temperature CCE and perovskite crystals could be successfully formed by the reaction with DMAPbI 3 . In this case, due to the existence of liquid crystal intermediate state and volume expansion, interfacial contact would become better and the charge transfer and recombination characteristics have improved considerably. The best performance devices based on optimized MA gas treatment time exhibit higher efficiency of 12.4% than that of PSCs fabricated by conventional ways with low-temperature processed CCE (9.6%).
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2020
·
IF 7.216
Yingxin Lin,Zhipeng Wen,Jiaxiang Liu,Dongzheng Wu,Peng Zhang,Jinbao Zhao
The metallic lithium (Li) is the ultimate option in the development of anodes for high-energy secondary batteries. Unfortunately, inferior cycling reversibility and Li dendrites growth of Li metal as anode enormously impede its commercialization. Here, a uniform LiI protective layer is constructed on Li metal anode via a facile and direct solid–gas reaction of Li metal with iodine vapor. The pre-constructed LiI layer possesses more steadily and faster Li ion transport than the conventional SEI layer and contributes to a steady interface for the Li metal anode, which affords a smooth Li deposition morphology without Li dendrites formation. The symmetrical cell with the Li metal anode protected by LiI layer exhibits a longer cycling lifetime of over 700 h at a current density of 1 mA cm −2 with Li plating capacity of 1 mAh cm −2 . Moreover, the LiI layer protected Li metal anode can still remain high capacity retention of 74.6% after 500 cycles in the full cell paired with NCM523 cathode. The work proposes an easy and effective method to fabricate a uniform and stable protective layer on the Li metal anode and offers a practicable thinking for the commercial implementation of Li metal batteries.
研究领域:
材料科学
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电化学
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能源存储
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纳米材料
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电池技术
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界面化学
✓ 已验证
DOI
高影响因子
Nature Communications
·
2023
·Vol. 14
·期 1
·1-9
·
IF 16.6
Xu Xiao,Zhou Jiazheng,Yin Kang,Wang Jinlin,Lou Licheng,Jiao Menghan,Zhang Bowen,Li Dongmei,Shi Jiangjian,Wu Huijue,Luo Yanhong,Meng Qingbo
Kesterite Cu 2 ZnSn(S, Se) 4 is considered one of the most competitive photovoltaic materials due to its earth-abundant and nontoxic constituent elements, environmental friendliness, and high stability. However, the preparation of high-quality Kesterite absorbers for photovoltaics is still challenging for the uncontrollability and complexity of selenization reactions between metal element precursors and selenium. In this study, we propose a solid-liquid/solid-gas (solid precursor and liquid/vapor Se) synergistic reaction strategy to precisely control the selenization process. By pre-depositing excess liquid selenium, we provide the high chemical potential of selenium to facilitate the direct and rapid formation of the Kesterite phase. The further optimization of selenium condensation and subsequent volatilization enables the efficient removal of organic compounds and thus improves charge transport in the absorber film. As a result, we achieve high-performance Kesterite solar cells with total-area efficiency of 13.6% (certified at 13.44%) and 1.09 cm 2 -area efficiency of 12.0% (certified at 12.1%).
研究领域:
材料科学
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光伏技术
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太阳能
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半导体物理
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）