LiMnPO₄ has been attracting attention for high energy density (701 Wh kg⁻¹) and excellent safety. However, LiMnPO₄ suffers from the cycling instability coming from the fragile solid electrolyte interface, besides the Jahn-Teller effect of Mn³⁺, the poor electrical conductivity and the sluggish ionic conductivity. The substitution of cation with less ionic radius for Mn²⁺ is conducive to stabilize the solid-electrolyte interface and retard the erosion from electrolyte; therefore, the gradient Co-doped LiMn_0.98Co_0.02PO₄ was synthesized with 25.93 (mol) % Co on the surface by the secondary solvothermal method, and the permeated depth reaches more than 20 nm because of the coprecipitation and cation exchange of Co²⁺ and Mn²⁺. LiMn_0.98Co_0.02PO₄/Li cell that demonstrates the cycling performance is remarkably enhanced with 87% capacity retention after 380 cycles at room temperature, even 87% after 100 cycles at 60 °C. Meanwhile, the preferential growth along the a–c plane results in the highly [010]-oriented LiMnPO₄ by the solvothermal, which afford more channels for Li⁺ migration by exposing more reaction sites, and the infrared spectrum also reflects the less Mn²⁺-Li⁺ antisite defects in the crystal. So the samples show the superior rate performance as well.

LiMnPO ₄的高能量密度（701 Wh kg ^-1）和出色的安全性已引起人们的关注。然而，除了Mn ³⁺的Jahn-Teller效应，差的电导率和缓慢的离子电导率之外，LiMnPO _4还遭受来自脆弱的固体电解质界面的循环不稳定性的困扰。用较小的离子半径的阳离子代替Mn ²⁺有利于稳定固体电解质界面并阻止电解质的侵蚀。因此，梯度共掺杂LiMn _0.98 Co _0.02 PO ₄通过二次溶剂热法在表面上以25.93（mol）％Co的形式合成了Co，并且由于Co ²⁺和Mn ²⁺的共沉淀和阳离子交换，渗透深度达到20 nm以上。证明了循环性能的LiMn _0.98 Co _0.02 PO ₄ / Li电池在室温下380个循环后显着提高了87％的容量保持率，在60°C下进行了100次循环后仍显着提高了87％容量。同时，沿a – c平面的优先生长通过溶剂热导致高度[010]取向的LiMnPO ₄，这为Li ⁺提供了更多通道。通过暴露更多的反应位点而迁移，并且红外光谱也反映出晶体中较少的Mn ²⁺ -Li ⁺反位点缺陷。因此，样本也显示出优异的速率性能。