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Explorando a intercalação de lÃtio em FeNbO₄ de fase dupla
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ISBN10: 6208896428
ISBN13: 9786208896423
Publisher: Edicoes Nosso Conhecimento
Published: Jul 16 2025
Pages: 56
Weight: 0.19
Height: 0.13 Width: 6.00 Depth: 9.00
Language: Portuguese
ISBN13: 9786208896423
Publisher: Edicoes Nosso Conhecimento
Published: Jul 16 2025
Pages: 56
Weight: 0.19
Height: 0.13 Width: 6.00 Depth: 9.00
Language: Portuguese
Os materiais nanoestruturados são muito mais eficazes do que os materiais a granel quando utilizados como eléctrodos em baterias de iões de lÃtio. Isto deve-se ao facto de o seu tamanho mais pequeno permitir que os iões de lÃtio se movam mais rápida e facilmente, melhorando as taxas de carga e descarga. Também lidam melhor com o stress causado pelo lÃtio que entra e sai do material. Quando o tamanho das partÃculas é reduzido para apenas alguns nanómetros, a forma como o lÃtio reage com o material pode mudar significativamente. Por exemplo, o FeNbO4 com uma estrutura α-PbO2 tem um comportamento muito diferente consoante o tamanho das partÃculas. Num estudo, o FeNbO4 foi produzido em tamanhos nanométricos e micrométricos utilizando os métodos sol-gel (SG) e reação em estado sólido (SSR). Entre as duas estruturas cristalinas estudadas - α-PbO2 e volframite - a forma α-PbO2 apresentou uma melhor retenção de capacidade.
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