Pseudocapacitive charge storage induced by self-enhanced electrical conductivity and Li-ion diffusion in high performance Li3VO4@LiVO2 anode for Li-ion batteries
Pseudocapacitive charge storage induced by self-enhanced electrical conductivity and Li-ion diffusion in high performance Li3VO4@LiVO2 anode for Li-ion batteries
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锂离子电池高性能Li3VO4@LiVO2阳极中自增强电导率和锂离子扩散引起的赝电容电荷存储
DOI：
10.1016/j.jallcom.2018.01.129
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发表时间：
2018-04
影响因子：
6.2
通讯作者：
Jinbao Zhao
中科院分区：
文献类型：
--
作者：
Tao Kang;Dongyang Shen;Shibing Ni;Qichang Chen;Tao Li;Xuelin Yang;Jinbao Zhao
通过中间溶液法制备了Li3VO4@LiVO2复合材料，该复合材料具有Li 3VO 4晶体被LiVO 2基体均匀包围的特殊结构。在Li 3 VO 4@LiVO 2中，小尺寸的Li 3 VO 4和弱结晶的LiVO 2提供自增强的快速锂离子扩散和高电导率，从而触发高伪电容电荷存储并导致优异的上级循环稳定性和倍率能力。Li3VO4@LiVO2在0.15 A g−1的比电流下提供569和448 mAh g− 1的初始放电和充电容量。放电和充电容量在循环中没有衰减，在100次循环后保持在468和471 mAh g− 1。在0.1至2.0 A g−1的各种比电流下循环70次后，当比电流恢复到0.1 A g −1时，Li3VO4@LiVO2恢复到478 mAh g− 1的高可逆容量。
Li3VO4@LiVO2composite with a specific architecture of Li3VO4crystals homogeneously embraced by LiVO2matrix is fabricated via an intermediate solution approach with subsequent sintering. In the Li3VO4@LiVO2, the small-sized Li3VO4and the weak crystallized LiVO2render self-enhanced fast lithium ion diffusion and high electrical conductivity, which trigger high pseudocapacitive charge storage and result in superior cycle stability and rate capability. The Li3VO4@LiVO2delivers initial discharge and charge capacities of 569 and 448 mAh g−1at a specific current of 0.15 A g−1. The discharge and charge capacities exhibit no attenuation in cycling, maintaining at 468 and 471 mAh g−1after 100 cycles. After 70 cycles at various specific currents from 0.1 to 2.0 A g−1, the Li3VO4@LiVO2recovers high reversible capacity of 478 mAh g−1when reverting the specific current to 0.1 A g−1.
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