Multifunctional Li(Ni0.5Co0.2Mn0.3) O2-Si batteries with self-actuation and self-sensing
Multifunctional Li(Ni0.5Co0.2Mn0.3) O2-Si batteries with self-actuation and self-sensing
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DOI：
10.1177/1045389x19898768
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发表时间：
2020-02
影响因子：
2.7
通讯作者：
Jun Ma;Cody Gonzalez;Qingquan Huang;Joseph Farese;C. Rahn;M. Frecker;Donghai Wang
中科院分区：
文献类型：
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作者：
Jun Ma;Cody Gonzalez;Qingquan Huang;Joseph Farese;C. Rahn;M. Frecker;Donghai Wang
在锂离子电池负极材料中，硅具有理论容量高、成本低、体积变化大、容量衰减相对较快以及应力-电位耦合显着等优点。本文表明，Li(Ni0.5Co0.2Mn0.3)O2-Si 电池可以存储能量，通过 Si 体积变化进行驱动，并通过应力-电势耦合进行传感。实验在带有玻璃窗的充满电解质的室中进行，该室具有Li(Ni 0. 5 Co 0. 2 M n 0. 3 ) O 2 阴极和Si复合阳极。硅阳极在多孔复合结构中单面涂覆在铜集流体上，并涂有硅纳米粒子、聚丙烯酸粘合剂和导电炭黑。在充电过程中，电池储存能量，锂插入悬臂硅阳极中，悬臂横向弯曲。电池放电会释放存储的能量并拉直硅悬臂梁。在固定充电状态下对硅悬臂施加变形会导致复合涂层中的弯曲应力和开路电位的变化。 1 Hz 频率下的测试证实，Si 复合材料对动态应力变化有响应，几乎没有相位滞后，这表明 Si 复合材料阳极中应力-电势耦合的带宽至少为 1 Hz。
Among anode materials for Li-ion batteries, Si is known for high theoretical capacity, low cost, large volume change, relatively fast capacity fade and significant stress-potential coupling. This article shows that a Li(Ni0.5Co0.2Mn0.3)O2-Si battery can store energy, actuate with Si volume change and sense with stress-potential coupling. Experiments are conducted in an electrolyte-filled chamber with a glass window with Li ( N i 0 . 5 C o 0 . 2 M n 0 . 3 ) O 2 cathodes and Si composite anodes. The Si anodes are single-side coated on Cu current collector with Si nanoparticles, polyacrylic acid binder and conductive carbon black in a porous composite structure. During charging, the battery stores energy, Li inserts in the cantilevered Si anodes and the cantilevers bend laterally. Discharging the battery releases the stored energy and straightens the Si cantilevers. Imposing deformation on the Si cantilevers at a fixed state of charge causes bending stress in the composite coating and a change in the open circuit potential. Testing at 1 Hz confirms that the Si composite responds to dynamic stress variations and with almost no phase lag, indicating the bandwidth of the stress-potential coupling in Si composite anodes is at least 1 Hz .