The conversion-type anodes have been widely investigated in lithium-ion batteries (LIBs), due to their high theoretical specific capacity. However, their rate capability and cyclic stability were suffered from large volume expansion and pulverization. Herein, we report a method to improve the electrochemical performance of conversion-type anodes by using the steric effect of intercalation-type materials, as was done in conversion-type MnCO₃. The role of the intercalation-type TiO₂ nanocrystals in the structural evolution of composite anodes was verified. It was found that TiO₂ nanocrystals could form a good electrical contact with as-pulverized MnCO₃ anode, and maintain their structural stability. Furthermore, the electrochemical analysis shows that TiO₂ nanocrystals can provide fast electron transfer channels for the composites matrix, which is conducive to improving the rate capability of MnCO₃ anode. Moreover, TiO₂ nanocrystals can effectively avoid the aggregation of metal Mn nanocrystals by their steric effect. As a result, the composite anode showed better electrochemical properties than its counterpart MnCO₃ by delivering 378 mA h g⁻¹ at a current density of 1 A g⁻¹ after 200 cycles. Different from previously reported methods, our strategy is simple and easy to scale. Importantly, our research provides a new insight for solving issues involved volume expansion and pulverization of conversion-type anodes.

转换型阳极由于其较高的理论比容量，已在锂离子电池（LIB）中得到了广泛的研究。然而，它们的速率能力和循环稳定性受到大体积膨胀和粉碎的影响。在此，我们报道了一种利用插层型材料的空间效应来改善转化型阳极电化学性能的方法，就像在转化型MnCO _3中一样。验证了插层型TiO ₂纳米晶体在复合阳极结构演变中的作用。发现TiO ₂纳米晶体可以与粉碎的MnCO ₃形成良好的电接触。阳极，并保持其结构稳定性。此外，电化学分析表明，TiO ₂纳米晶体可为复合材料基体提供快速的电子传递通道，有利于提高MnCO ₃阳极的倍率能力。而且，TiO ₂纳米晶体通过其空间效应可以有效地避免金属Mn纳米晶体的聚集。结果，通过在1 A g ^-1的电流密度下输送378 mA h g ^-1，复合阳极显示出比其对应的MnCO ₃更好的电化学性能。200个周期后。与以前报道的方法不同，我们的策略简单易扩展。重要的是，我们的研究为解决涉及体积膨胀和转化型阳极粉化的问题提供了新的见识。